JP7635911B2 - Camera module drive unit - Google Patents

Description

This disclosure relates to a camera module driving device.

Conventionally, there is known a camera unit that includes a camera module having a lens and an image sensor, and an image stabilization device (camera module drive device) for correcting the shake of an optical image formed on the image sensor by the lens (see Patent Document 1). The camera module drive device has an inner frame that fixes the camera module inside, a middle frame that supports the inner frame from the outside so that it can swing freely around a first axis, an outer frame that supports the middle frame from the outside so that it can swing freely around a second axis, and a voice coil motor provided at the bottom of the inner frame and on the outside of the outer frame.

JP 2011-66580 A

The camera module drive device described above uses a voice coil motor system, so there is a risk that it may not be able to handle large amounts of camera shake.

Therefore, it is desirable to provide a camera module driving device that can correct camera shake even when the amount of camera shake is large.

A camera module driving device according to an embodiment of the present invention is a camera module driving device including: a first swinging member capable of holding a camera module having a lens body and an image sensor; a second swinging member connected to the first swinging member so that the first swinging member can swing about a first axis line that intersects with an optical axis direction; a fixed-side member connected to the second swinging member so that the second swinging member can swing about a second axis line that intersects with the optical axis direction and is perpendicular to the axial direction of the first axis; and a driving unit that swings the first swinging member relative to the fixed-side member so that the optical axis of the lens body is tilted. In the module driving device, the driving unit has a first driving unit that oscillates the first oscillating member around the first axis and a second driving unit that oscillates the second oscillating member around the second axis, and is provided with an auxiliary means that assists in driving at least one of the first driving unit and the second driving unit , and the auxiliary means has a magnetic member and another magnetic member that are arranged at a distance from each other, and is configured so that the more the optical axis of the lens body tilts, the smaller the distance between the magnetic member and the other magnetic member becomes, and the magnetic attraction force acting between the magnetic member and the other magnetic member increases .

The camera module driving device described above can correct camera shake even when the amount of camera shake is large.

FIG. FIG. FIG. 2 is an exploded perspective view of the camera module driving device. FIG. FIG. 2 is a front view of a shape memory alloy wire attached to a metal member. FIG. 2 is a left side view of a shape memory alloy wire attached to a metal member. FIG. 2 is a top perspective view of a first swinging member; FIG. 4 is a bottom perspective view of a first swinging member. FIG. 4 is a top perspective view of a second swinging member. FIG. 4 is a bottom perspective view of a second swinging member. FIG. FIG. 2 is a top perspective view of a leaf spring, a first oscillating member, a second oscillating member, and a base member. FIG. 2 is a top perspective view of a leaf spring, a first oscillating member, a second oscillating member, and a base member. 1 is a left side view of the leaf spring, the first swinging member, the second swinging member, and the base member; FIG. FIG. 2 is a top perspective view of a metal member, a leaf spring, a shape memory alloy wire, an inner conductive member, and an outer conductive member. FIG. 9B is an enlarged view of a portion of FIG. 9A. FIG. 9B is an enlarged view of a portion of FIG. 9A. 11 is a right side view of the first swinging member, the second swinging member, and the base member. FIG. 4 is a front view of a first oscillating member, a second oscillating member, and a base member, with a portion of the base member shown in cross section; FIG. 4 is a cross-sectional view of a cover member and a magnetic member. FIG. 4 is a cross-sectional view of a cover member and a magnetic member. FIG.

The imaging device ID including the camera module driving device 101 according to an embodiment of the present invention will be described below with reference to the drawings. FIG. 1A is an exploded perspective view of the imaging device ID with the camera module CM removed from the camera module driving device 101. FIG. 1B is an assembled perspective view of the imaging device ID with the camera module CM attached to the camera module driving device 101. FIG. 2 is an exploded perspective view of the camera module driving device 101. FIG. 3 is an exploded perspective view of the rocking mechanism SM that constitutes the camera module driving device 101.

In FIG. 1A, X1 represents one direction of the X axis constituting the three-dimensional orthogonal coordinate system, and X2 represents the other direction of the X axis. Y1 represents one direction of the Y axis constituting the three-dimensional orthogonal coordinate system, and Y2 represents the other direction of the Y axis. Similarly, Z1 represents one direction of the Z axis constituting the three-dimensional orthogonal coordinate system, and Z2 represents the other direction of the Z axis. In FIG. 1A, the X1 side of the imaging device ID corresponds to the front side (front side) of the imaging device ID, and the X2 side of the imaging device ID corresponds to the rear side (rear side) of the imaging device ID. The Y1 side of the imaging device ID corresponds to the left side of the imaging device ID, and the Y2 side of the imaging device ID corresponds to the right side of the imaging device ID. The Z1 side of the imaging device ID corresponds to the upper side (subject side) of the imaging device ID, and the Z2 side of the imaging device ID corresponds to the lower side (imaging element side) of the imaging device ID. The same applies to other figures, and also to other devices, members, mechanisms, etc.

As shown in Figures 1A, 1B, and 2, the camera module driving device 101 includes a cover member 4 that is part of the fixed side member FB. The cover member 4 includes an upper cover member 4U and a lower cover member 4D.

The cover member 4 is configured to function as a housing HS that covers the other members that make up the imaging device ID. In this embodiment, the upper cover member 4U and the lower cover member 4D are formed of a magnetic material such as a magnetic metal. As shown in FIG. 1A, the cover member 4 has a box-shaped outer shape that defines the storage section 4S. As shown in FIG. 1B, the camera module CM is stored within the storage section 4S.

As shown in FIG. 1A, the camera module CM is composed of a substrate CB, a sensor holder SH, a lens drive device LD, a lens body LS held by the lens drive device LD, and an image sensor IS mounted on the substrate CB so as to face the lens body LS. The lens body LS is, for example, a cylindrical lens barrel equipped with at least one lens, and is configured so that its central axis line is along the optical axis OA. The sensor holder SH is provided with a partition wall having an opening formed therein for exposing the image sensor IS. The image sensor IS is accommodated on the lower side (Z2 side) of the partition wall, and an IR cut filter (not shown) is arranged on the upper side (Z1 side) of the partition wall. In this embodiment, the camera module CM is a camera module equipped with an automatic focus adjustment function of a voice coil motor type including a magnet and a coil. The camera module CM may be equipped with a drive mechanism of a type other than the voice coil motor type, such as a piezoelectric type or a shape memory actuator type. The substrate CB is connected to the outside via a flexible cable 3.

As shown in FIG. 2, the upper cover member 4U has an outer peripheral wall portion 4A having a substantially rectangular cylindrical shape, and a flat upper plate portion 4B provided so as to be continuous with the upper end (the end on the Z1 side) of the outer peripheral wall portion 4A. The outer peripheral wall portion 4A includes a first side plate portion 4A1 to a fourth side plate portion 4A4. The first side plate portion 4A1 and the third side plate portion 4A3 face each other, and the second side plate portion 4A2 and the fourth side plate portion 4A4 face each other. The first side plate portion 4A1 and the third side plate portion 4A3 extend perpendicularly to the second side plate portion 4A2 and the fourth side plate portion 4A4. The upper plate portion 4B has an opening 4K in the center, as shown in FIG. 2.

2, the lower cover member 4D includes a frame-shaped (C-shaped) bottom 4C with a front portion cut out, a left wall 4WL provided so as to be continuous with the left end of the bottom 4C, and a right wall 4WR provided so as to be continuous with the right end of the bottom 4C. The left wall 4WL is configured so that its inner surface (Y2 side surface) faces the outer surface (Y1 side surface) of the second side plate 4A2 of the upper cover member 4U. The right wall 4WR is configured so that its inner surface (Y1 side surface) faces the outer surface (Y2 side surface) of the fourth side plate 4A4 of the upper cover member 4U.

The upper cover member 4U and the lower cover member 4D are joined to the base member 8 (see FIG. 3) by an adhesive. The adhesive is, for example, a light-curing adhesive. The light-curing adhesive is, for example, an ultraviolet-curing adhesive or a visible-light-curing adhesive. The adhesive may be a moisture-curing adhesive or a heat-curing adhesive. The same applies to the adhesives described below. The cover member 4 serving as the housing HS contains a leaf spring 6, a rocking mechanism SM, an insulating substrate 10, and the like, as shown in FIG. 2.

The rocking mechanism SM is configured to rock the camera module CM around a rocking axis. As shown in FIG. 2, the rocking axis includes a first rocking axis AX1 and a second rocking axis AX2 that are perpendicular to each other when viewed from above along the optical axis direction. Hereinafter, for ease of explanation, the first rocking axis AX1 and the second rocking axis AX2 may be referred to as the rocking axis AX. The optical axis direction includes the direction of the optical axis OA with respect to the lens body LS and a direction parallel to the optical axis OA.

Specifically, as shown in FIG. 3, the oscillating mechanism SM is composed of a movable member MB, a metal member, a base member 8, a shape memory alloy wire, etc.

The metal members include a first front metal member 5AF, a first rear metal member 5AB, a second front metal member 5BF, a second rear metal member 5BB, a third front metal member 5CF, a third rear metal member 5CB, a fourth left metal member 5DL, a fourth right metal member 5DR, a fifth left metal member 5EL, a fifth right metal member 5ER, a sixth left metal member 5FL, and a sixth right metal member 5FR.

For convenience of explanation, the first front metal member 5AF and the first rear metal member 5AB may be referred to as the first metal member 5A. For convenience of explanation, the second front metal member 5BF and the second rear metal member 5BB may be referred to as the second metal member 5B. For convenience of explanation, the third front metal member 5CF and the third rear metal member 5CB may be referred to as the third metal member 5C. For convenience of explanation, the fourth left metal member 5DL and the fourth right metal member 5DR may be referred to as the fourth metal member 5D. For convenience of explanation, the fifth left metal member 5EL and the fifth right metal member 5ER may be referred to as the fifth metal member 5E. For convenience of explanation, the sixth left metal member 5FL and the sixth right metal member 5FR may be referred to as the sixth metal member 5F. For ease of explanation, the first metal member 5A to the sixth metal member 5F may be referred to as metal member 5.

The shape memory alloy wire extends along the inner surface of the outer peripheral wall portion 4A of the upper cover member 4U, and is configured to be able to swing the movable side member MB relative to the fixed side member FB. In this embodiment, the shape memory alloy wire includes the first inner wire 9A1 to the fourth inner wire 9A4 and the first outer wire 9B1 to the fourth outer wire 9B4, and is configured to be able to swing the first swing member 2 and the second swing member 7 as the movable side member MB relative to the base member 8 as the fixed side member FB. For convenience of explanation, the first inner wire 9A1 to the fourth inner wire 9A4 may be referred to as the first shape memory alloy wire 9A. For convenience of explanation, the first outer wire 9B1 to the fourth outer wire 9B4 may be referred to as the second shape memory alloy wire 9B. And, the first shape memory alloy wire 9A and the second shape memory alloy wire 9B may be referred to as the shape memory alloy wire 9 for convenience of explanation.

The movable side member MB includes a first oscillating member 2 and a second oscillating member 7. The first oscillating member 2 is configured to be able to hold the camera module CM. In this embodiment, the first oscillating member 2 is configured to be able to oscillate around a first oscillating axis AX1 relative to the second oscillating member 7, and the second oscillating member 7 is configured to be able to oscillate around a second oscillating axis AX2 relative to the base member 8, so as to enable movement to tilt the optical axis OA related to the lens body LS.

The movable side member MB is moved by the driving unit DM so that the optical axis OA is tilted. The driving unit DM is configured to be able to swing the first oscillating member 2 relative to the fixed side member FB so that the optical axis OA of the lens body is tilted. In this embodiment, the driving unit DM includes a first driving unit DM1 that swings the first oscillating member 2 relative to the second oscillating member 7, and a second driving unit DM2 that swings the second oscillating member 7 relative to the base member 8. The driving unit DM is configured by a shape memory alloy wire 9. Specifically, the shape memory alloy wire 9 includes a first shape memory alloy wire 9A provided between the first oscillating member 2 and the second oscillating member 7, and a second shape memory alloy wire 9B provided between the second oscillating member 7 and the fixed side member FB (base member 8). The first driving unit DM1 is configured by the first shape memory alloy wire 9A, and the second driving unit DM2 is configured by the second shape memory alloy wire 9B. The first oscillating member 2 is moved by the first shape memory alloy wire 9A so that it can oscillate around the first oscillating axis AX1 relative to the second oscillating member 7. The second oscillating member 7 is moved by the second shape memory alloy wire 9B so that it can oscillate around the second oscillating axis AX2 relative to the base member 8.

The first oscillating member 2 has an upper holder 2U and a lower holder 2D. In this embodiment, the upper holder 2U is made of a magnetic metal so as to function as a magnetic shield. This is to suppress magnetic interference between the components of the camera module CM and the components of the camera module driving device 101. However, the upper holder 2U may also be made of a non-magnetic metal, synthetic resin, or the like.

Specifically, as shown in FIG. 3, the upper holding body 2U has an outer peripheral wall portion 2A having a substantially rectangular cylindrical shape, and a flat upper plate portion 2B provided so as to be continuous with the upper end (the end on the Z1 side) of the outer peripheral wall portion 2A. The upper plate portion 2B has an opening 2K in the center.

The lower holding body 2D is formed by injection molding a synthetic resin such as liquid crystal polymer (LCP). In the example shown in FIG. 3, the lower holding body 2D includes a substantially rectangular cylindrical frame portion 2F formed to extend along the optical axis OA, and a pair of shaft portions (a left shaft portion 2XL (not visible in FIG. 3; see FIG. 5(B)) and a right shaft portion 2XR) that protrude outward from the frame portion 2F along the first oscillation axis AX1. Hereinafter, for convenience of explanation, the left shaft portion 2XL and the right shaft portion 2XR may be referred to as a pair of shaft portions 2X.

Of the four walls (rear wall 2WB, front wall 2WF, left wall 2WL, and right wall 2WR) of the frame 2F, which has a generally rectangular outer shape when viewed from above, four round protrusions 2T protruding upward are formed on the upper ends of two opposing walls (left wall 2WL and right wall 2WR). A portion of the leaf spring 6 is placed on the upper end of each of these two walls (left wall 2WL and right wall 2WR).

The pair of shafts 2X are parts that make up the first oscillating axis AX1, and include a left shaft 2XL (not visible in FIG. 3; see FIG. 5B) formed on the outside of the left wall 2WL of the frame 2F, and a right shaft 2XR formed on the outside of the right wall 2WR of the frame 2F. Specifically, the left shaft 2XL and the right shaft 2XR each have a semi-cylindrical shape that is convex upward. The pair of shafts 2X are configured to be received by a pair of receivers (left receiver 7SL and right receiver 7SR) provided on the second oscillating member 7. Hereinafter, the left receiver 7SL and right receiver 7SR may be referred to as a pair of receivers 7S for ease of explanation.

The upper holder 2U and the lower holder 2D are configured to accommodate at least a portion of the camera module CM. The lower holder 2D is fixed to the upper holder 2U with an adhesive. At this time, the outer peripheral wall portion 2A of the upper holder 2U is disposed inside the frame portion 2F of the lower holder 2D.

The second rocking member 7 is formed by injection molding synthetic resin such as liquid crystal polymer (LCP). In the example shown in FIG. 3, the second rocking member 7 has a frame-shaped portion 7F having a substantially rectangular frame shape, and a pair of receiving portions 7S is formed at the center of the lower end of two opposing walls (left wall portion 7WL and right wall portion 7WR) out of the four walls (rear wall portion 7WB, front wall portion 7WF, left wall portion 7WL, and right wall portion 7WR) that constitute the frame-shaped portion 7F. In addition, a pair of shaft portions (front shaft portion 7XF and rear shaft portion 7XB) are formed on the outside of the other two opposing walls (rear wall portion 7WB and front wall portion 7WF) out of the four walls that constitute the frame-shaped portion 7F. Hereinafter, the front shaft portion 7XF and the rear shaft portion 7XB may be referred to as a pair of shaft portions 7X for convenience of explanation.

In this embodiment, the pair of receiving portions 7S have a generally V-groove shape that is concave upward so as to receive a pair of shaft portions 2X that have a semi-cylindrical outer shape that is convex upward. Specifically, the pair of receiving portions 7S includes a left receiving portion 7SL formed in the center of the lower end of the left wall portion 7WL of the frame portion 7F, and a right receiving portion 7SR formed in the center of the lower end of the right wall portion 7WR of the frame portion 7F.

The pair of shafts 7X are parts that make up the second oscillating axis AX2, and include a front shaft 7XF formed on the outside of the front wall 7WF of the frame-shaped part 7F, and a rear shaft 7XB formed on the outside of the rear wall 7WB of the frame-shaped part 7F. Specifically, the front shaft 7XF and the rear shaft 7XB each have a semi-cylindrical outer shape that is convex downward. The pair of shafts 7X are configured to be received by a pair of receiving parts (front receiving part 8SF and rear receiving part 8SB) provided on the base member 8. Hereinafter, the front receiving part 8SF and the rear receiving part 8SB may be referred to as a pair of receiving parts 8S for ease of explanation.

The base member 8 is formed by injection molding synthetic resin such as liquid crystal polymer (LCP). In the example shown in FIG. 3, the base member 8 has a frame-shaped portion 8F having a substantially rectangular frame shape, and a pair of receiving portions 8S is formed at the center of the upper ends of two opposing walls (rear wall portion 8WB and front wall portion 8WF) of the four walls (rear wall portion 8WB, front wall portion 8WF, left wall portion 8WL, and right wall portion 8WR) that constitute the frame-shaped portion 8F. In this embodiment, the pair of receiving portions 8S has a substantially V-shaped groove shape that is concave downward so as to receive a pair of shaft portions 7X having a semi-cylindrical outer shape that is convex downward. Specifically, the pair of receiving portions 8S includes a front receiving portion 8SF formed at the center of the upper end of the front wall portion 8WF of the frame-shaped portion 8F, and a rear receiving portion 8SB formed at the center of the upper end of the rear wall portion 8WB of the frame-shaped portion 8F.

A pedestal portion is formed at the upper end of each of the front wall portion 8WF and the rear wall portion 8WB of the frame portion 8F. In the example shown in FIG. 3, the pedestal portion includes a first pedestal portion 8D1 to a fourth pedestal portion 8D4. The first pedestal portion 8D1 and the second pedestal portion 8D2 are formed at the upper end of the front wall portion 8WF so as to sandwich the front support portion 8SF. The third pedestal portion 8D3 and the fourth pedestal portion 8D4 are formed at the upper end of the rear wall portion 8WB so as to sandwich the rear support portion 8SB. Hereinafter, the first pedestal portion 8D1 to the fourth pedestal portion 8D4 may be referred to as pedestal portion 8D for ease of explanation.

The shape memory alloy wire 9, which is an example of a shape memory actuator, constitutes the driving unit DM. In this embodiment, the shape memory alloy wire 9 includes a first shape memory alloy wire 9A and a second shape memory alloy wire 9B. The first shape memory alloy wire 9A includes a first inner wire 9A1 to a fourth inner wire 9A4. The second shape memory alloy wire 9B includes a first outer wire 9B1 to a fourth outer wire 9B4. When a current flows through the shape memory alloy wire 9, the temperature increases and the wire contracts in response to the increase in temperature. The driving unit DM can use the contraction of the shape memory alloy wire 9 to swing the movable side member MB around the swing axis AX. Specifically, the driving unit DM (first driving unit DM1) can use the contraction of the first shape memory alloy wire 9A to swing the first swing member 2 around the first swing axis AX1 relative to the second swing member 7. In addition, the drive unit DM (second drive unit DM2) can use the contraction of the second shape memory alloy wire 9B to swing the second oscillating member 7 around the second oscillating axis AX2 relative to the base member 8.

In the example shown in FIG. 3, the shape memory alloy wire 9 is configured such that when one or more of the first inner wire 9A1 to fourth inner wire 9A4 and the first outer wire 9B1 to fourth outer wire 9B4 contract, the movable side member MB swings, and the swinging stretches the other one or more. Specifically, the drive unit DM can swing the first swing member 2 relative to the second swing member 7 in a clockwise direction as viewed from the right side about the first swing axis AX1 by simultaneously contracting the first inner wire 9A1 and the second inner wire 9A2. In addition, the drive unit DM can swing the first swing member 2 relative to the second swing member 7 in a counterclockwise direction as viewed from the right side about the first swing axis AX1 by simultaneously contracting the third inner wire 9A3 and the fourth inner wire 9A4. In addition, the drive unit DM can swing the first oscillating member 2 and the second oscillating member 7 relative to the base member 8 in the counterclockwise direction when viewed from the front about the second oscillating axis AX2 by simultaneously contracting the first outer wire 9B1 and the second outer wire 9B2. In addition, the drive unit DM can swing the first oscillating member 2 and the second oscillating member 7 relative to the base member 8 in the clockwise direction when viewed from the front about the second oscillating axis AX2 by simultaneously contracting the third outer wire 9B3 and the fourth outer wire 9B4.

Thus, the drive unit DM has a plurality of first shape memory alloy wires 9A provided between the first oscillating member 2 and the second oscillating member 7, and a plurality of second shape memory alloy wires 9B provided between the second oscillating member 7 and the fixed side member FB (base member 8).

The first shape memory alloy wire 9A is arranged at each of two positions spaced apart in the axial direction of the second oscillation axis AX2 across the first oscillation member 2, and the second shape memory alloy wire 9B is arranged at each of two positions spaced apart in the axial direction of the first oscillation axis AX1 across the first oscillation member 2.

Two first shape memory alloy wires 9A are arranged at two positions spaced apart in the axial direction of the second oscillation axis AX2, and the two first shape memory alloy wires 9A cross each other when viewed along the axial direction of the second oscillation axis AX2, forming a first wire pair.

In the example shown in FIG. 3, a first inner wire 9A1 and a second inner wire 9A2 are arranged in a position in front of the first oscillating member 2, and the first inner wire 9A1 and the second inner wire 9A2 cross each other in a front view and form a first front wire pair. In addition, a third inner wire 9A3 and a fourth inner wire 9A4 are arranged in a position in rear of the first oscillating member 2, and the third inner wire 9A3 and the fourth inner wire 9A4 cross each other in a rear view and form a first rear wire pair.

Two second shape memory alloy wires 9B are arranged at two positions spaced apart in the axial direction of the first oscillation axis AX1, and these two second shape memory alloy wires 9B cross each other when viewed along the axial direction of the first oscillation axis AX1 and form a second wire pair.

In the example shown in FIG. 3, a first outer wire 9B1 and a second outer wire 9B2 are arranged on the left side of the first oscillating member 2, and the first outer wire 9B1 and the second outer wire 9B2 cross each other in a left side view and form a second left wire pair. Also, a third outer wire 9B3 and a fourth outer wire 9B4 are arranged on the right side of the first oscillating member 2, and the third outer wire 9B3 and the fourth outer wire 9B4 cross each other in a right side view and form a second right wire pair.

In this embodiment, the shape memory alloy wire 9 is fixed to each of the movable member MB and the fixed member FB via the metal member 5. The metal member 5 is configured so that the end of the shape memory alloy wire 9 is fixed.

In the example shown in FIG. 3, one end (lower end) of each of the first inner wire 9A1 and the second inner wire 9A2 is connected to the first front metal member 5AF. That is, the first inner wire 9A1 and the second inner wire 9A2 are connected in series via the first front metal member 5AF. Similarly, one end (lower end) of each of the third inner wire 9A3 and the fourth inner wire 9A4 is connected to the first rear metal member 5AB. That is, the third inner wire 9A3 and the fourth inner wire 9A4 are connected in series via the first rear metal member 5AB.

The other end (upper end) of the first inner wire 9A1 is connected to the second front metal member 5BF, and the other end (upper end) of the third inner wire 9A3 is connected to the second rear metal member 5BB. The other end (upper end) of the second inner wire 9A2 is connected to the third front metal member 5CF, and the other end (upper end) of the fourth inner wire 9A4 is connected to the third rear metal member 5CB.

The fourth left metal member 5DL is connected to one end (upper end) of each of the first outer wire 9B1 and the second outer wire 9B2. That is, the first outer wire 9B1 and the second outer wire 9B2 are connected in series via the fourth left metal member 5DL. Similarly, the fourth right metal member 5DR is connected to one end (upper end) of each of the third outer wire 9B3 and the fourth outer wire 9B4. That is, the third outer wire 9B3 and the fourth outer wire 9B4 are connected in series via the fourth right metal member 5DR.

The other end (lower end) of the first outer wire 9B1 is connected to the fifth left metal member 5EL, and the other end (lower end) of the third outer wire 9B3 is connected to the fifth right metal member 5ER. The other end (lower end) of the second outer wire 9B2 is connected to the sixth left metal member 5FL, and the other end (lower end) of the fourth outer wire 9B4 is connected to the sixth right metal member 5FR.

The insulating substrate 10 is a member for connecting the drive unit DM and the control unit (not shown). The control unit is configured to be able to supply current to the drive unit DM, and is typically installed outside the housing HS. In this embodiment, the insulating substrate 10 is a flexible printed circuit board, and as shown in FIG. 2, includes a rear portion 10B, a left portion 10L, and a right portion 10R. The rear portion 10B includes a tongue portion 10T that is bent at the front end of the center portion of the rear portion 10B and extends upward.

A magnetic sensor is attached to the insulating substrate 10. The magnetic sensor is configured to detect the position of the movable member MB by detecting the position of a magnet as a magnetic member attached to the movable member MB. In this embodiment, the magnetic sensor includes a rear magnetic sensor 11B, a left magnetic sensor 11L, and a right magnetic sensor 11R. For convenience of explanation, the rear magnetic sensor 11B, the left magnetic sensor 11L, and the right magnetic sensor 11R may be referred to as magnetic sensors 11.

As shown in FIG. 2, the rear magnetic sensor 11B is attached to the tongue portion 10T of the insulating substrate 10, the left magnetic sensor 11L is attached to the left side portion 10L of the insulating substrate 10, and the right magnetic sensor 11R is attached to the right side portion 10R of the insulating substrate 10.

In this embodiment, the magnetic sensor 11 is configured to detect the position of the movable member MB using an analog output type Hall element. However, the magnetic sensor 11 may be configured to detect the position of the movable member MB using a magnetic resistance element such as a Giant Magneto Resistive effect (GMR) element, a Semiconductor Magneto Resistive (SMR) element, an Anisotropic Magneto Resistive (AMR) element, or a Tunnel Magneto Resistive (TMR) element that can detect a magnetic field generated by a magnet as a magnetic member.

Here, referring to Figures 4A and 4B, the metal member 5 to which the shape memory alloy wire 9 is attached will be described. Figure 4A is a front view of the shape memory alloy wire 9 attached to the metal member 5. Specifically, Figure 4A shows the first inner wire 9A1 attached to the first front metal member 5AF and the second front metal member 5BF, and the second inner wire 9A2 attached to the first front metal member 5AF and the third front metal member 5CF, as viewed from the X1 side (front side). Figure 4B is a left side view of the shape memory alloy wire 9 attached to the metal member 5. Specifically, Figure 4B shows the first inner wire 9A1 attached to the first front metal member 5AF and the second front metal member 5BF, and the second inner wire 9A2 attached to the first front metal member 5AF and the third front metal member 5CF, as viewed from the Y1 side (left side). The positional relationship of each component shown in FIG. 4A and FIG. 4B corresponds to the positional relationship of each component when the camera module driving device 101 is assembled. In FIG. 4A and FIG. 4B, other components are omitted for clarity. The following description with reference to FIG. 4A and FIG. 4B relates to the first front wire pair, which is a combination of the first inner wire 9A1 and the second inner wire 9A2, but also applies to the first rear wire pair, which is a combination of the third inner wire 9A3 and the fourth inner wire 9A4, the second left wire pair, which is a combination of the first outer wire 9B1 and the second outer wire 9B2, and the second right wire pair, which is a combination of the third outer wire 9B3 and the fourth outer wire 9B4.

Specifically, one end (lower end) of the first inner wire 9A1 is fixed to the first front metal member 5AF by a retaining portion J1 at the left end of the first front metal member 5AF, and the other end (upper end) of the first inner wire 9A1 is fixed to the second front metal member 5BF by a retaining portion J2 at the right end of the second front metal member 5BF. More specifically, the first inner wire 9A1 is fixed to the first front metal member 5AF by crimping, welding, or the like. Similarly, one end (lower end) of the second inner wire 9A2 is fixed to the first front metal member 5AF by a retaining portion J3 at the right end of the first front metal member 5AF, and the other end (upper end) of the second inner wire 9A2 is fixed to the third front metal member 5CF by a retaining portion J4 at the left end of the third front metal member 5CF.

The retaining portion J1 is formed by bending a part of the first front metal member 5AF. Specifically, a part of the first front metal member 5AF is bent while sandwiching one end (lower end) of the first inner wire 9A1, thereby forming the retaining portion J1. The one end (lower end) of the first inner wire 9A1 is fixed to the retaining portion J1 by welding. The same is true for the retaining portions J2 to J4.

The first inner wire 9A1 and the second inner wire 9A2 are arranged so that they are twisted relative to each other, as shown in Figures 4A and 4B. In other words, the first inner wire 9A1 and the second inner wire 9A2 are arranged so that they do not contact each other (are non-contacting).

Next, referring to Figures 5A and 5B, an example of the configuration of the first oscillating member 2 will be described. Figure 5A is a top perspective view of the first oscillating member 2. Specifically, Figure 5A is an exploded top perspective view of the first oscillating member 2. Figure 5B is a bottom perspective view of the first oscillating member 2. Specifically, Figure 5B is a bottom perspective view of the lower holding body 2D that constitutes the first oscillating member 2, and the upper holding body 2U that constitutes the first oscillating member 2 is omitted from the illustration. Note that for clarity, in Figures 5A and 5B, cross patterns are applied to the first front metal member 5AF and the first rear metal member 5AB.

The first front metal member 5AF is attached to the front wall portion 2WF of the frame portion 2F of the lower holding body 2D, and the first rear metal member 5AB is attached to the rear wall portion 2WB of the frame portion 2F of the lower holding body 2D.

Specifically, the first front metal member 5AF is fixed to the frame portion 2F by adhesive applied to the rectangular hole AH1. The same is true for the first rear metal member 5AB.

A step 2S is formed on the inner peripheral surface of the frame portion 2F of the lower holding body 2D. The lower end of the outer peripheral wall portion 2A of the upper holding body 2U is positioned by the step 2S when the upper holding body 2U is inserted into the lower holding body 2D. The upper holding body 2U and the lower holding body 2D are then joined together with an adhesive.

The camera module CM (see FIG. 1A) is bonded to the upper holder 2U with adhesive, with the top surface of the camera module CM (the cover of the lens drive device LD) in contact with the ceiling surface of the upper plate portion 2B of the upper holder 2U.

With this configuration, the camera module CM is held by the upper holder 2U with its position in the optical axis direction fixed. Note that in this embodiment, the upper holder 2U and the lower holder 2D are joined together before the camera module CM and the upper holder 2U are joined together.

Next, referring to Figures 6A and 6B, an example of the configuration of the second oscillating member 7 will be described. Figure 6A is a top perspective view of the second oscillating member 7. Specifically, Figure 6A(a) is a top perspective view of the second oscillating member 7 in which the inner conductive member is embedded. Figure 6A(b) is a top perspective view of the inner conductive member embedded in the second oscillating member 7. Figure 6A(c) is a top perspective view of the second oscillating member 7 to which the metal member 5 is attached. Figure 6B is a bottom perspective view of the second oscillating member 7. For clarity, a cross pattern is applied to the metal member 5 in Figures 6A and 6B.

The inner conductive members include a first inner conductive member 15A to a fourth inner conductive member 15D. Hereinafter, the first inner conductive member 15A to the fourth inner conductive member 15D may be referred to as the inner conductive member 15 for ease of explanation. Also, for clarity, in Figures 6A and 6B, the inner conductive member 15 is given a fine dot pattern.

In this embodiment, the inner conductive member 15 is formed from a metal plate containing a material such as copper, iron, or an alloy containing these as its main components, and is embedded in the second oscillating member 7 by insert molding.

The first inner conductive member 15A has a top surface connection portion 15pA exposed on the top surface (Z1 side surface) of the front wall portion 7WF of the second oscillating member 7, and a side surface connection portion 15sA exposed on the front surface (X1 side surface) of the front wall portion 7WF of the second oscillating member 7.

The second inner conductive member 15B has a top surface connection portion 15pB exposed on the top surface of the front wall portion 7WF of the second oscillating member 7, and a side surface connection portion 15sB exposed on the front surface of the front wall portion 7WF of the second oscillating member 7.

The third inner conductive member 15C has a top surface connection portion 15pC exposed on the top surface of the rear wall portion 7WB of the second oscillating member 7, and a side surface connection portion 15sC exposed on the rear surface (X2 side surface) of the rear wall portion 7WB of the second oscillating member 7.

The fourth inner conductive member 15D has a top surface connection portion 15pD exposed on the top surface of the rear wall portion 7WB of the second oscillating member 7, and a side surface connection portion 15sD exposed on the rear surface of the rear wall portion 7WB of the second oscillating member 7.

The second front metal member 5BF is welded to the side connection portion 15sA of the first inner conductive member 15A exposed on the front surface of the front wall portion 7WF of the second rocking member 7. The second front metal member 5BF may be joined to the side connection portion 15sA by a conductive adhesive.

The third front metal member 5CF is welded to the side connection portion 15sB of the second inner conductive member 15B exposed to the front surface of the front wall portion 7WF of the second rocking member 7. The third front metal member 5CF may be joined to the side connection portion 15sB by a conductive adhesive.

The second rear metal member 5BB is welded to the side connection portion 15sD of the fourth inner conductive member 15D exposed on the rear surface of the rear wall portion 7WB of the second rocking member 7. The second rear metal member 5BB may be joined to the side connection portion 15sD by a conductive adhesive.

The third rear metal member 5CB is welded to the side connection portion 15sC of the third inner conductive member 15C exposed on the rear surface of the rear wall portion 7WB of the second rocking member 7. The third rear metal member 5CB may be joined to the side connection portion 15sC by a conductive adhesive.

Specifically, the second front metal member 5BF is fixed to the second oscillating member 7 by adhesive applied to the round hole RH1 (see FIG. 6A(c)), and is joined to the side connection portion 15sA by welding such as laser welding performed in the round hole RH2 (see FIG. 6A(c)). The same is true for the second rear metal member 5BB, the third front metal member 5CF, and the third rear metal member 5CB.

The fourth right metal member 5DR is adhered to the right surface of the right wall portion 7WR of the second oscillating member 7 as shown in FIG. 6A, and the fourth left metal member 5DL is adhered to the left surface of the left wall portion 7WL of the second oscillating member 7 as shown in FIG. 6B.

Specifically, the fourth right metal member 5DR is fixed to the second oscillating member 7 by adhesive applied to the rectangular hole AH2 (see FIG. 6A (c)). The same is true for the fourth left metal member 5DL.

Next, referring to FIG. 7, an example of the configuration of the base member 8 will be described. FIG. 7 is a top perspective view of the base member 8. Specifically, FIG. 7(a) is a top perspective view of the base member 8 in which the outer conductive member is embedded. FIG. 7(b) is a top perspective view of the outer conductive member embedded in the base member 8. FIG. 7(c) is a top perspective view of the base member 8 in which the metal member 5 is attached.

The outer conductive members include the first outer conductive member 16A to the eighth outer conductive member 16H. Hereinafter, the first outer conductive member 16A to the eighth outer conductive member 16H may be referred to as the outer conductive members 16 for ease of explanation.

In this embodiment, the outer conductive member 16 is formed from a metal plate containing a material such as copper, iron, or an alloy containing these as its main components, and is embedded in the base member 8 by insert molding.

The first outer conductive member 16A has an upper surface connection portion 16pA exposed on the upper surface (Z1 side surface) of the front wall portion 8WF of the base member 8, and a terminal portion 16tA exposed on the lower surface (Z2 side surface) of the base member 8.

The second outer conductive member 16B has an upper surface connection portion 16pB exposed on the upper surface of the front wall portion 8WF of the base member 8, and a terminal portion 16tB exposed on the lower surface of the base member 8.

The third outer conductive member 16C has an upper surface connection portion 16pC exposed on the upper surface of the rear wall portion 8WB of the base member 8, and a terminal portion 16tC exposed on the lower surface of the base member 8.

The fourth outer conductive member 16D has an upper surface connection portion 16pD exposed on the upper surface of the rear wall portion 8WB of the base member 8, and a terminal portion 16tD exposed on the lower surface of the base member 8.

The fifth outer conductive member 16E has a side connection portion 16sE exposed on the right surface (Y2 side surface) of the right wall portion 8WR of the base member 8, and a terminal portion 16tE exposed on the underside of the base member 8.

The sixth outer conductive member 16F has a side connection portion 16sF exposed on the left surface (Y1 side surface) of the left wall portion 8WL of the base member 8, and a terminal portion 16tF exposed on the underside of the base member 8.

The seventh outer conductive member 16G has a side connection portion 16sG exposed on the left surface of the left wall portion 8WL of the base member 8, and a terminal portion 16tG exposed on the underside of the base member 8.

The eighth outer conductive member 16H has a side connection portion 16sH exposed on the right surface of the right wall portion 8WR of the base member 8, and a terminal portion 16tH exposed on the underside of the base member 8.

The fifth right metal member 5ER is welded to the side connection portion 16sH of the eighth outer conductive member 16H exposed on the right surface of the right wall portion 8WR of the base member 8. The fifth right metal member 5ER may be joined to the side connection portion 16sH by a conductive adhesive.

The fifth left metal member 5EL is welded to the side connection portion 16sG of the seventh outer conductive member 16G exposed on the left surface of the left wall portion 8WL of the base member 8. The fifth left metal member 5EL may be joined to the side connection portion 16sG by a conductive adhesive.

The sixth right metal member 5FR is welded to the side connection portion 16sE of the fifth outer conductive member 16E exposed on the right surface of the right wall portion 8WR of the base member 8. The sixth right metal member 5FR may be joined to the side connection portion 16sE by a conductive adhesive.

The sixth left metal member 5FL is welded to the side connection portion 16sF of the sixth outer conductive member 16F exposed on the left surface of the left wall portion 8WL of the base member 8. The sixth left metal member 5FL may be joined to the side connection portion 16sF by a conductive adhesive.

Next, referring to Figures 8A to 8C, the connection relationship between the leaf spring 6 and each of the first oscillating member 2 (lower holding body 2D), second oscillating member 7, and base member 8 will be described. Figure 8A is a top perspective view of the lower holding body 2D, leaf spring 6, second oscillating member 7, and base member 8 in a disassembled state. Figure 8B is a top perspective view of the lower holding body 2D, leaf spring 6, second oscillating member 7, and base member 8 in an assembled state. Figure 8C is a left side view of the lower holding body 2D, leaf spring 6, second oscillating member 7, and base member 8 in an assembled state. Note that in Figures 8A to 8C, the upper holding body 2U constituting the first oscillating member 2 is omitted for clarity. Also, in Figures 8A to 8C, for clarity, a fine dot pattern is applied to the lower holder 2D, a coarse dot pattern is applied to the second oscillating member 7, and an even coarser dot pattern is applied to the base member 8. The same applies to Figures 10 and 11.

The leaf springs 6 are configured to connect the first oscillating member 2 (lower holding body 2D), the second oscillating member 7, and the base member 8. In this embodiment, the leaf springs 6 are made from metal plates whose main material is, for example, a copper alloy, a titanium-copper alloy (titanium-copper), or a copper-nickel alloy (nickel-tin-copper), and are configured to function as a conductive path. Specifically, the leaf springs 6 include a first leaf spring 6A to a fourth leaf spring 6D.

The first leaf spring 6A is configured to connect the first oscillating member 2 (lower holding body 2D), the second oscillating member 7, and the base member 8. In this embodiment, the first leaf spring 6A has an inner portion 6iA fixed to the lower holding body 2D, a central portion 6mA fixed to the second oscillating member 7, an outer portion 6eA fixed to the base member 8, an inner elastic arm portion 6gA connecting the inner portion 6iA and the central portion 6mA, and an outer elastic arm portion 6fA connecting the outer portion 6eA and the central portion 6mA. Similarly, the second leaf spring 6B has an inner portion 6iB, a central portion 6mB, an outer portion 6eB, an inner elastic arm portion 6gB, and an outer elastic arm portion 6fB, the third leaf spring 6C has an inner portion 6iC, a central portion 6mC, an outer portion 6eC, an inner elastic arm portion 6gC, and an outer elastic arm portion 6fC, and the fourth leaf spring 6D has an inner portion 6iD, a central portion 6mD, an outer portion 6eD, an inner elastic arm portion 6gD, and an outer elastic arm portion 6fD. In the following, for ease of explanation, the inner portion 6iA to inner portion 6iD may be referred to as the inner portion 6i, the central portion 6mA to central portion 6mD may be referred to as the central portion 6m, the outer portion 6eA to outer portion 6eD may be referred to as the outer portion 6e, the inner elastic arm portion 6gA to inner elastic arm portion 6gD may be referred to as the inner elastic arm portion 6g, and the outer elastic arm portion 6fA to outer elastic arm portion 6fD may be referred to as the outer elastic arm portion 6f.

The inner portion 6iA of the first leaf spring 6A is fixed to the upper end of the right wall portion 2WR of the frame portion 2F of the lower retainer 2D, as shown by the dashed line in FIG. 8A. The inner portion 6iA has two first through holes 6H1 through which two protruding portions 2T formed on the upper end of the right wall portion 2WR of the frame portion 2F and protruding upward are inserted. In this embodiment, the inner portion 6iA and the protruding portions 2T are fixed by hot crimping or cold crimping the protruding portions 2T. However, the inner portion 6iA and the protruding portions 2T may also be fixed by adhesive. The same applies to the inner portion 6iB of the second leaf spring 6B, the inner portion 6iC of the third leaf spring 6C, and the inner portion 6iD of the fourth leaf spring 6D.

The central portion 6mA of the first leaf spring 6A is fixed to the upper surface connection portion 15pA of the first inner conductive member 15A exposed on the upper surface of the front wall portion 7WF of the second swinging member 7, as shown by the dashed line in FIG. 8A. Two second through holes 6H2 are formed in the central portion 6mA to be used for joining with the upper surface connection portion 15pA. In this embodiment, the joining between the central portion 6mA and the upper surface connection portion 15pA is realized by welding such as laser welding performed in the second through holes 6H2. However, the joining between the central portion 6mA and the upper surface connection portion 15pA may be realized by solder or a conductive adhesive. The same is true for the central portion 6mB of the second leaf spring 6B, the central portion 6mC of the third leaf spring 6C, and the central portion 6mD of the fourth leaf spring 6D.

The outer portion 6eB of the second leaf spring 6B is placed on the upper surface of the second pedestal portion 8D2 formed on the front wall portion 8WF of the base member 8, as shown by the dashed line in FIG. 8A, and is fixed to the upper surface connection portion 16pB of the second outer conductive member 16B exposed on the upper surface of the second pedestal portion 8D2. The outer portion 6eB has two third through holes 6H3 through which two protruding portions 8T formed on the upper surface of the second pedestal portion 8D2 protruding upward are inserted, and a fourth through hole 6H4 used for joining the upper surface connection portion 16pB of the second outer conductive member 16B. In this embodiment, the fixing of the outer portion 6eB and the protruding portion 8T is realized by applying hot crimping or cold crimping to the protruding portion 8T. However, the fixing of the outer portion 6eB and the protruding portion 8T may be realized by an adhesive. In addition, the outer portion 6eB and the upper surface connection portion 16pB are joined by welding such as laser welding performed in the fourth through hole 6H4. However, the outer portion 6eB and the upper surface connection portion 16pB may also be joined by solder or a conductive adhesive. The same applies to the outer portion 6eA of the first leaf spring 6A, the outer portion 6eC of the third leaf spring 6C, and the outer portion 6eD of the fourth leaf spring 6D.

As shown in FIG. 8C, the third leaf spring 6C is fixed to the first rocking member 2 (lower holding body 2D) and the second rocking member 7 so that the height of the central portion 6mC is higher than the height of the inner portion 6iC by a height H1. Due to this configuration, the third leaf spring 6C having the central portion 6mC and the inner portion 6iC functions as a first biasing member that applies a force such that the pair of shaft portions 2X (left shaft portion 2XL and right shaft portion 2XR) and the pair of receiving portions 7S (left receiving portion 7SL and right receiving portion 7SR) press against each other. As shown in FIG. 8C, the third leaf spring 6C is fixed to the second rocking member 7 and the base member 8 so that the height of the central portion 6mC is higher than the height of the outer portion 6eC by a height H2. Due to this configuration, the third leaf spring 6C having a central portion 6mC and an outer portion 6eC functions as a second biasing member that applies a force that presses the pair of shafts 7X (front shaft portion 7XF and rear shaft portion 7XB) and the pair of receiving portions 8S (front receiving portion 8SF and rear receiving portion 8SB) against each other. The same applies to the first leaf spring 6A, the second leaf spring 6B, and the fourth leaf spring 6D.

Next, the positional relationship between the metal member 5, leaf spring 6, shape memory alloy wire 9, inner conductive member 15, and outer conductive member 16 will be described with reference to Figures 9A to 9C. Figure 9A is a top perspective view of the metal member 5, leaf spring 6, shape memory alloy wire 9, inner conductive member 15, and outer conductive member 16 in an assembled state.

Figure 9B is a top perspective view of the first front metal member 5AF, the second front metal member 5BF, the third front metal member 5CF, the first leaf spring 6A, the second leaf spring 6B, the first inner wire 9A1, the second inner wire 9A2, the first inner conductive member 15A, the second inner conductive member 15B, the first outer conductive member 16A, and the second outer conductive member 16B, and corresponds to a view of a portion of Figure 9A.

Figure 9C is a top perspective view of the fourth right metal member 5DR, the fifth right metal member 5ER, the sixth right metal member 5FR, the third outer wire 9B3, the fourth outer wire 9B4, the fifth outer conductive member 16E, and the eighth outer conductive member 16H, and corresponds to a partial view of Figure 9A.

In addition, in Figures 9A to 9C, for clarity, a cross pattern is applied to the metal member 5, a fine dot pattern is applied to the leaf spring 6, a coarse dot pattern is applied to the inner conductive member 15, and an even coarser dot pattern is applied to the outer conductive member 16.

As shown in FIG. 9A, each of the first leaf spring 6A to the fourth leaf spring 6D has the same shape and is arranged so as to have two-fold rotational symmetry about the optical axis OA. Therefore, this configuration can reduce the number of parts in the camera module driving device 101. In addition, the leaf spring 6 composed of the first leaf spring 6A to the fourth leaf spring 6D can support the first oscillating member 2 and the second oscillating member 7 with good balance relative to the base member 8.

The outer portion 6eA of the first leaf spring 6A is joined by welding to the upper surface connection portion 16pA of the first outer conductive member 16A (see FIG. 7(b)).

The outer portion 6eB of the second leaf spring 6B is joined by welding to the upper surface connection portion 16pB of the second outer conductive member 16B (see FIG. 7(b)).

The outer portion 6eC of the third leaf spring 6C is joined by welding to the upper surface connection portion 16pC of the third outer conductive member 16C (see FIG. 7(b)).

The outer portion 6eD of the fourth leaf spring 6D is joined by welding to the upper surface connection portion 16pD of the fourth outer conductive member 16D (see FIG. 7(b)).

The central portion 6mA of the first leaf spring 6A is joined by welding to the upper surface connection portion 15pA of the first inner conductive member 15A (see FIG. 6A(b)).

The central portion 6mB of the second leaf spring 6B is joined by welding to the upper surface connection portion 15pB of the second inner conductive member 15B (see FIG. 6A (b)).

The central portion 6mC of the third leaf spring 6C is joined by welding to the upper surface connection portion 15pC of the third inner conductive member 15C (see FIG. 6A (b)).

The central portion 6mD of the fourth leaf spring 6D is joined by welding to the upper surface connection portion 15pD of the fourth inner conductive member 15D (see FIG. 6A (b)).

The side connection portion 15sA (see FIG. 6A(b)) of the first inner conductive member 15A is joined to the second front metal member 5BF by welding.

The side connection portion 15sB of the second inner conductive member 15B (see FIG. 6A (b)) is joined to the third front metal member 5CF by welding.

The side connection portion 15sC of the third inner conductive member 15C (see FIG. 6A (b)) is joined to the third rear metal member 5CB by welding.

The side connection portion 15sD of the fourth inner conductive member 15D (see FIG. 6A (b)) is joined to the second rear metal member 5BB by welding.

The side connection portion 16sE of the fifth outer conductive member 16E (see FIG. 7(b)) is joined to the sixth right metal member 5FR by welding.

The side connection portion 16sF of the sixth outer conductive member 16F (see FIG. 7(b)) is joined to the sixth left metal member 5FL by welding.

The side connection portion 16sG of the seventh outer conductive member 16G (see FIG. 7(b)) is joined to the fifth left metal member 5EL by welding.

The side connection portion 16sH of the eighth outer conductive member 16H (see FIG. 7(b)) is joined to the fifth right metal member 5ER by welding.

The second front metal member 5BF is connected to the first front metal member 5AF via the first inner wire 9A1, and the third front metal member 5CF is connected to the first front metal member 5AF via the second inner wire 9A2.

The second rear metal member 5BB is connected to the first rear metal member 5AB via the third inner wire 9A3, and the third rear metal member 5CB is connected to the first rear metal member 5AB via the fourth inner wire 9A4.

The fifth left metal member 5EL is connected to the fourth left metal member 5DL via the first outer wire 9B1, and the sixth left metal member 5FL is connected to the fourth left metal member 5DL via the second outer wire 9B2.

The fifth right metal member 5ER is connected to the fourth right metal member 5DR via the third outer wire 9B3, and the sixth right metal member 5FR is connected to the fourth right metal member 5DR via the fourth outer wire 9B4.

Terminal portions 16tA to 16tH (see FIG. 7(b)) are connected to a conductive pattern (not shown) formed on the upper surface of insulating substrate 10 by solder or conductive adhesive.

Next, referring to FIG. 9B, the path of the current flowing through the first shape memory alloy wire 9A will be described. Specifically, FIG. 9B shows the path of the current when the terminal portion 16tA of the first outer conductive member 16A is connected to a high potential and the terminal portion 16tB of the second outer conductive member 16B is connected to a low potential. The following description relates to the path of the current flowing from the terminal portion 16tA through the first inner wire 9A1 and the second inner wire 9A2 to the terminal portion 16tB, but the same applies to the path of the current flowing from the terminal portion 16tB through the second inner wire 9A2 and the first inner wire 9A1 to the terminal portion 16tA, and also to the path of the current flowing through the third inner wire 9A3 and the fourth inner wire 9A4.

When the terminal 16tA of the first outer conductive member 16A is connected to a high potential and the terminal 16tB of the second outer conductive member 16B is connected to a low potential, a current flows from the terminal 16tA through the first outer conductive member 16A to the first leaf spring 6A as shown by the arrow AR1 in Fig. 9B. The current then passes through the first leaf spring 6A as shown by the arrow AR2, the first inner conductive member 15A as shown by the arrow AR3, the second front metal member 5BF as shown by the arrow AR4, the first inner wire 9A1 as shown by the arrow AR5, and further passes through the first front metal member 5AF as shown by the arrows AR6 and AR7. The current then flows through the second inner wire 9A2 as indicated by the arrow AR8, through the third front metal member 5CF as indicated by the arrow AR9, through the second inner conductive member 15B as indicated by the arrow AR10, through the second leaf spring 6B as indicated by the arrow AR11, and through the second outer conductive member 16B as indicated by the arrow AR12 to the terminal portion 16tB.

When the terminal 16tB of the second outer conductive member 16B is connected to a high potential and the terminal 16tA of the first outer conductive member 16A is connected to a low potential, the current flows in the reverse direction along the above-mentioned path.

Next, referring to FIG. 9C, the path of the current flowing through the second shape memory alloy wire 9B will be described. Specifically, FIG. 9C shows the path of the current when the terminal portion 16tE of the fifth outer conductive member 16E is connected to a high potential and the terminal portion 16tH of the eighth outer conductive member 16H is connected to a low potential. The following description relates to the path of the current flowing from the terminal portion 16tE through the fourth outer wire 9B4 and the third outer wire 9B3 to the terminal portion 16tH, but the same applies to the path of the current flowing from the terminal portion 16tH through the third outer wire 9B3 and the fourth outer wire 9B4 to the terminal portion 16tE, and also to the path of the current flowing through the first outer wire 9B1 and the second outer wire 9B2.

When the terminal 16tE of the fifth outer conductive member 16E is connected to a high potential and the terminal 16tH of the eighth outer conductive member 16H is connected to a low potential, current flows from the terminal 16tE through the fifth outer conductive member 16E to the sixth right metal member 5FR as shown by the arrow AR21 in FIG. 9C. The current then flows through the fourth outer wire 9B4 as shown by the arrow AR22, through the fourth right metal member 5DR as shown by the arrow AR23, through the third outer wire 9B3 as shown by the arrow AR24, through the fifth right metal member 5ER as shown by the arrow AR25, and through the eighth outer conductive member 16H to the terminal 16tH as shown by the arrow AR26.

When the terminal 16tH of the eighth outer conductive member 16H is connected to a high potential and the terminal 16tE of the fifth outer conductive member 16E is connected to a low potential, the current flows in the reverse direction along the above-mentioned path.

The camera module driving device 101 is controlled by a control device. The control device is typically a device that is installed outside the camera module driving device 101 and is connected to the camera module driving device 101 via an insulating substrate 10.

The control device can control the contraction of each of the eight shape memory alloy wires 9, for example, by controlling the voltage applied to each of terminals 16tA to 16tH. Alternatively, the control device can control the contraction of each of the eight shape memory alloy wires 9 by controlling the current supplied to each of the eight shape memory alloy wires 9 via terminals 16tA to 16tH. The control device can then swing the movable side member MB, for example, by utilizing the driving force generated by the contraction of the shape memory alloy wires 9 as the drive unit DM. The control device can then achieve a camera shake correction function, which is one of the lens adjustment functions, by swinging the movable side member MB.

Next, referring to FIG. 10, the configuration for swinging the first swing member 2 relative to the second swing member 7 will be described. FIG. 10 is a right side view of the first swing member 2 (lower holding body 2D), the second swing member 7, and the base member 8 in an assembled state. Specifically, FIG. 10(a) is a right side view of the first swing member 2 (lower holding body 2D), the second swing member 7, and the base member 8 when the camera module driving device 101 is in the initial state. FIG. 10(b) is a right side view of the first swing member 2 (lower holding body 2D), the second swing member 7, and the base member 8 when the first swing member 2 (lower holding body 2D) is swung by an angle θ1 in the counterclockwise direction around the first swing axis AX1.

The initial state of the camera module driving device 101 refers to the state of the camera module driving device 101 when no current is supplied to the shape memory alloy wire 9 that constitutes the driving unit DM. In this initial state, the optical axis direction is perpendicular to the axial direction of the first oscillation axis AX1, and the optical axis direction is perpendicular to the axial direction of the second oscillation axis AX2. The initial state can also be called a neutral state in which the first oscillation member 2 and the second oscillation member 7, which are oscillated by the driving unit DM, are in a neutral position.

As shown in FIG. 10, a right shaft portion 2XR that protrudes to the right is formed in the center of the right wall portion 2WR of the lower holding body 2D. In this embodiment, the right shaft portion 2XR has a semi-cylindrical shape that protrudes upward, and is received in a right receiving portion 7SR that is recessed upward and formed in the center of the right wall portion 7WR of the second swinging member 7. Although not visible in FIG. 10, as shown in FIG. 5B, a left shaft portion 2XL that protrudes to the left is formed in the center of the left wall portion 2WL of the lower holding body 2D. In this embodiment, the left shaft portion 2XL has a semi-cylindrical shape that protrudes upward, and is received in a left receiving portion 7SL that is recessed upward and formed in the center of the left wall portion 7WL of the second swinging member 7 as shown in FIG. 6A.

The pair of shafts 2X (left shaft 2XL and right shaft 2XR) formed on the lower holding body 2D and the pair of receiving parts 7S (left receiving part 7SL and right receiving part 7SR) formed on the second swinging member 7 constitute the first swinging mechanism SM1. The first swinging mechanism SM1 is a part of the swinging mechanism SM, and is a mechanism for swinging the first swinging member 2 around the first swinging axis AX1 relative to the second swinging member 7. The pair of receiving parts 7S are configured to have a substantially V-groove shape so as to fit the pair of shafts 2X having a semicylindrical outer shape, but may also be configured to have a semicircular groove shape. The pair of shafts 2X and the pair of receiving parts 7S are configured to have line contact along the first swinging axis AX1, but may also be configured to have surface contact.

In the example shown in FIG. 10, the first rocking mechanism SM1 is composed of a pair of upwardly convex shaft portions 2X formed on the lower holding body 2D and a pair of upwardly concave receiving portions 7S formed on the second rocking member 7, but it may also be composed of a pair of downwardly concave receiving portions formed on the lower holding body 2D and a pair of downwardly convex shaft portions formed on the second rocking member 7.

In the example shown in FIG. 10(b), the control device can contract the third inner wire 9A3 and the fourth inner wire 9A4 constituting the first rear wire pair located on the rear side (X2 side) of the first oscillating member 2 (lower holding body 2D) to swing the first oscillating member 2 (lower holding body 2D) in the counterclockwise direction around the first oscillating axis AX1 in the right side view. The control device can also contract the first inner wire 9A1 and the second inner wire 9A2 constituting the first front wire pair located on the front side (X1 side) of the first oscillating member 2 (lower holding body 2D) to swing the first oscillating member 2 (lower holding body 2D) in the clockwise direction around the first oscillating axis AX1 in the right side view.

Next, referring to FIG. 11, the configuration for swinging the second swing member 7 relative to the base member 8 will be described. FIG. 11 is a front view of the first swing member 2 (lower holding body 2D), the second swing member 7, and the base member 8 in an assembled state, and includes a cross section of the base member 8 when viewed from the X1 side as indicated by the arrow on a virtual plane (cross section) parallel to the YZ plane including the dashed line XI-XI shown in FIG. 8C. Specifically, FIG. 11(a) is a front view of the first swing member 2 (lower holding body 2D), the second swing member 7, and the base member 8 when the camera module driving device 101 is in the initial state. FIG. 11(b) is a front view of the first swing member 2 (lower holding body 2D), the second swing member 7, and the base member 8 when the second swing member 7 is swung counterclockwise around the second swing axis AX2 by an angle θ2.

As shown in FIG. 11, a front shaft portion 7XF that protrudes forward is formed in the center of the front wall portion 7WF of the second rocking member 7. In this embodiment, the front shaft portion 7XF has a semi-cylindrical outer shape that is convex downward, and is received in a front receiving portion 8SF that is recessed downward and formed in the center of the front wall portion 8WF of the base member 8. Also, although not visible in FIG. 11, a rear shaft portion 7XB that protrudes rearward is formed in the center of the rear wall portion 7WB of the second rocking member 7, as shown in FIG. 6B. In this embodiment, the rear shaft portion 7XB has a semi-cylindrical outer shape that protrudes downward, and is received in a rear receiving portion 8SB that is recessed downward and formed in the center of the rear wall portion 8WB of the base member 8, as shown in FIG. 7.

The pair of shafts 7X (front shaft 7XF and rear shaft 7XB) formed on the second rocking member 7 and the pair of receiving parts 8S (front receiving part 8SF and rear receiving part 8SB) formed on the base member 8 constitute the second rocking mechanism SM2. The second rocking mechanism SM2 is a part of the rocking mechanism SM, and is a mechanism for rocking the second rocking member 7 around the second rocking axis AX2 with respect to the base member 8. The first rocking member 2 rocks around the second rocking axis AX2 together with the second rocking member 7 by the second rocking mechanism SM2. The pair of receiving parts 8S are configured to have a substantially V-shaped groove shape so as to fit the pair of shafts 7X having a semicylindrical outer shape, but may be configured to have a semicircular groove shape. The pair of shafts 7X and the pair of receiving parts 8S are configured to have line contact along the second rocking axis AX2, but may be configured to have surface contact.

In the example shown in FIG. 11, the second rocking mechanism SM2 is composed of a pair of downwardly convex shaft portions 7X formed on the second rocking member 7 and a pair of downwardly concave receiving portions 8S formed on the base member 8, but it may also be composed of a pair of upwardly concave receiving portions formed on the second rocking member 7 and a pair of upwardly convex shaft portions formed on the base member 8.

In the example shown in FIG. 11(b), the control device can cause the second oscillating member 7 to oscillate in a counterclockwise direction around the second oscillating axis AX2 in a front view by contracting the first outer wire 9B1 and the second outer wire 9B2 constituting the second left-side wire pair located on the left side (Y1 side) of the second oscillating member 7. The control device can also cause the second oscillating member 7 to oscillate in a clockwise direction around the second oscillating axis AX2 in a front view by contracting the third outer wire 9B3 and the fourth outer wire 9B4 constituting the second right-side wire pair located on the right side (Y2 side) of the second oscillating member 7.

Next, with reference to Figures 12A and 12B, the arrangement of the magnetic sensor 11 that detects the swing state of the movable member MB will be described. Figure 12A is a cross-sectional view of the cover member and the magnetic member, and shows the state when the cross section of the cover member 4 and the magnetic member is viewed from the Y2 side as indicated by the arrow in a virtual plane parallel to the XZ plane including the dashed line XIIA-XIIA shown in Figure 1B. Figure 12B is a cross-sectional view of the cover member and the magnetic member, and shows the state when the cross section of the cover member 4 and the magnetic member is viewed from the X1 side as indicated by the arrow in a virtual plane parallel to the YZ plane including the dashed line XIIB-XIIB shown in Figure 1B. Note that in Figures 12A and 12B, for clarity, the illustration of members other than the cover member 4 and the magnetic member is omitted. Also, in Figures 12A and 12B, for clarity, a cross pattern is applied to the N pole part of the permanent magnet of the magnetic member, and a dot pattern is applied to the S pole part of the permanent magnet of the magnetic member.

The magnetic members include the first magnetic member MG1 to the tenth magnetic member MG10. Hereinafter, the first magnetic member MG1 to the tenth magnetic member MG10 may be referred to as magnetic members MG for ease of explanation. Furthermore, the first magnetic member MG1 to the fourth magnetic member MG4 and the seventh magnetic member MG7 to the tenth magnetic member MG10 may be referred to as movable magnetic members, and the fifth magnetic member MG5 and the sixth magnetic member MG6 may be referred to as fixed magnetic members.

As shown in FIG. 5B, the first magnetic member MG1 and the second magnetic member MG2 are magnetic members provided on the first oscillating member 2 (lower holding body 2D). In FIG. 5B, for clarity, a rough dot pattern is applied to the magnetic members (first magnetic member MG1, second magnetic member MG2, seventh magnetic member MG7, and eighth magnetic member MG8). Specifically, as shown in FIG. 5B, the first magnetic member MG1 is fitted into a recess formed in the central part of the lower surface of the left wall portion 2WL of the lower holding body 2D and fixed therein with adhesive. Similarly, the second magnetic member MG2 is fitted into a recess formed in the central part of the lower surface of the right wall portion 2WR of the lower holding body 2D and fixed therein with adhesive.

As shown in FIG. 6A(c), the third magnetic member MG3 and the fourth magnetic member MG4 are magnetic members provided on the second oscillating member 7. In FIG. 6A(c), for clarity, a coarse dot pattern is applied to the third magnetic member MG3 and the fourth magnetic member MG4. Specifically, as shown in FIG. 6A(c), the third magnetic member MG3 is fitted into a recess formed in the central portion of the upper surface of the left wall portion 7WL of the second oscillating member 7 and fixed therein with adhesive. Similarly, the fourth magnetic member MG4 is fitted into a recess formed in the central portion of the upper surface of the right wall portion 7WR of the second oscillating member 7 and fixed therein with adhesive.

The fifth magnetic member MG5 and the sixth magnetic member MG6 are members that constitute the fixed side member FB. In this embodiment, the fifth magnetic member MG5 is the lower cover member 4D, and the sixth magnetic member MG6 is the upper cover member 4U. However, the fifth magnetic member MG5 may be a separate member attached to the lower cover member 4D. Also, the sixth magnetic member MG6 may be a separate member attached to the upper cover member 4U.

As shown in FIG. 5B, the seventh magnetic member MG7 and the eighth magnetic member MG8 are magnetic members provided on the first oscillating member 2 (lower holding body 2D). Specifically, as shown in FIG. 5B, the seventh magnetic member MG7 is fitted into a recess formed in the central portion of the lower surface of the front wall portion 2WF of the lower holding body 2D and fixed with adhesive. Similarly, the eighth magnetic member MG8 is fitted into a recess formed in the central portion of the lower surface of the rear wall portion 2WB of the lower holding body 2D and fixed with adhesive.

The ninth magnetic member MG9 and the tenth magnetic member MG10 are magnetic members provided on the second oscillating member 7, as shown in FIG. 6B. In FIG. 6B, for clarity, the ninth magnetic member MG9 and the tenth magnetic member MG10 are provided with a coarse dot pattern. Specifically, as shown in FIG. 6B, the ninth magnetic member MG9 is fitted into a recess formed in the central portion of the lower surface of the front wall portion 7WF of the second oscillating member 7 and fixed therein with adhesive. Similarly, the tenth magnetic member MG10 is fitted into a recess formed in the central portion of the lower surface of the rear wall portion 7WB of the second oscillating member 7 and fixed therein with adhesive.

In this embodiment, the movable magnetic members (the first magnetic member MG1 to the fourth magnetic member MG4 and the seventh magnetic member MG7 to the tenth magnetic member MG10) are permanent magnets magnetized with two poles in the Z-axis direction.

In FIG. 12A, the position of the magnetic member MG when the camera module driving device 101 is in the initial state is represented by a solid line, the positions of the seventh magnetic member MG7 and the eighth magnetic member MG8 when the first oscillating member 2 is oscillated clockwise around the first oscillating axis AX1 in right side view are represented by thick dashed lines, and the positions of the seventh magnetic member MG7 and the eighth magnetic member MG8 when the first oscillating member 2 is oscillated counterclockwise around the first oscillating axis AX1 in right side view are represented by thin dashed lines. Note that the positions of the ninth magnetic member MG9 and the tenth magnetic member MG10 do not change when the first oscillating member 2 is oscillated around the first oscillating axis AX1.

In FIG. 12B, the position of the magnetic member MG when the camera module driving device 101 is in the initial state is represented by a solid line, the positions of the first magnetic member MG1 to the fourth magnetic member MG4 when the second oscillating member 7 is oscillated clockwise around the second oscillating axis AX2 in a front view are represented by thick dashed lines, and the positions of the first magnetic member MG1 to the fourth magnetic member MG4 when the second oscillating member 7 is oscillated counterclockwise around the second oscillating axis AX2 in a front view are represented by thin dashed lines.

Here, we will explain the auxiliary means that assists the driving force by the drive unit DM to oscillate the movable side member MB around the oscillation axis AX. First, we will explain the first auxiliary means AM1 that assists the driving force by the first drive unit DM1 to oscillate the first oscillating member 2 around the first oscillation axis AX1.

The oscillating state of the first oscillating member 2 is detected using the eighth magnetic member MG8 attached to the first oscillating member 2 (lower holding body 2D) as shown in FIG. 5B, and the rear magnetic sensor 11B attached to the tongue portion 10T in the center of the rear side portion 10B of the insulating substrate 10 as shown in FIG. 2.

As shown in FIG. 12A, the rear magnetic sensor 11B is arranged so as to detect the magnetic field generated by the eighth magnetic member MG8. Specifically, the rear magnetic sensor 11B is configured to output a higher voltage value as the N-pole portion of the eighth magnetic member MG8 approaches, i.e., as the first rocking member 2 rocks clockwise around the first rocking axis AX1 in a right side view, and to output a lower voltage value as the S-pole portion of the eighth magnetic member MG8 approaches, i.e., as the first rocking member 2 rocks counterclockwise around the first rocking axis AX1 in a right side view. Therefore, the control device can detect the rocking state of the first rocking member 2 based on the magnitude of the voltage value output by the rear magnetic sensor 11B.

As shown in FIG. 12A, the seventh magnetic member MG7 and the ninth magnetic member MG9 are arranged such that the magnetic attraction force acting between the seventh magnetic member MG7 and the ninth magnetic member MG9 (hereinafter referred to as the "first attraction force") increases as the first oscillating member 2 oscillates clockwise around the first oscillating axis AX1 when viewed from the right side.

The driving force by the first driving unit DM1 for swinging the first oscillating member 2 in the clockwise direction tends to become smaller as the first oscillating member 2 swings in the clockwise direction. This is because the first driving unit DM1 is composed of the first shape memory alloy wire 9A, and the contraction rate of the first shape memory alloy wire 9A becomes smaller as the first shape memory alloy wire 9A shrinks. The contraction rate is, for example, the amount of contraction of the first shape memory alloy wire 9A when a predetermined temperature rise occurs. Therefore, the first attraction force acts to compensate for the decrease in the driving force by the first driving unit DM1. Specifically, the seventh magnetic member MG7 and the ninth magnetic member MG9 are arranged so that the distance between the N pole portion of the seventh magnetic member MG7 and the S pole portion of the ninth magnetic member MG9 becomes smaller as the first oscillating member 2 swings in the clockwise direction around the first oscillating axis AX1 in the right side view.

On the other hand, the eighth magnetic member MG8 and the tenth magnetic member MG10 are arranged such that the magnetic attraction force acting between the eighth magnetic member MG8 and the tenth magnetic member MG10 (hereinafter referred to as the "second attraction force") increases as the first oscillating member 2 oscillates counterclockwise around the first oscillating axis AX1 when viewed from the right side, as shown in FIG. 12A.

The driving force by the first drive unit DM1 for swinging the first oscillating member 2 in the counterclockwise direction tends to become smaller as the first oscillating member 2 swings counterclockwise, similar to the driving force by the first drive unit DM1 for swinging the first oscillating member 2 in the clockwise direction. Therefore, the second attractive force acts to compensate for the decrease in the driving force by the first drive unit DM1. Specifically, the eighth magnetic member MG8 and the tenth magnetic member MG10 are arranged such that the distance between the N pole portion of the eighth magnetic member MG8 and the S pole portion of the tenth magnetic member MG10 becomes smaller as the first oscillating member 2 swings counterclockwise around the first oscillating axis AX1 in the right side view.

In this way, the seventh magnetic member MG7 to the tenth magnetic member MG10 function as a first auxiliary means AM1 that assists the driving force of the first drive unit DM1 to oscillate the first oscillating member 2 around the first oscillating axis AX1.

Next, we will explain the second auxiliary means AM2 that assists the driving force of the second drive unit DM2 to oscillate the second oscillating member 7 around the second oscillating axis AX2.

The swing state of the second oscillating member 7 is detected using the first magnetic member MG1 and the second magnetic member MG2 attached to the first oscillating member 2 (lower holding body 2D) as shown in FIG. 5B, and the left magnetic sensor 11L and the right magnetic sensor 11R attached to the insulating substrate 10 as shown in FIG. 2.

As shown in FIG. 12B, the left magnetic sensor 11L is arranged so as to detect the magnetic field generated by the first magnetic member MG1. Specifically, the left magnetic sensor 11L is configured so as to output a lower voltage value as the S-pole portion of the first magnetic member MG1 approaches, i.e., as the second oscillating member 7 oscillates counterclockwise around the second oscillating axis AX2 in a front view. As shown in FIG. 12B, the right magnetic sensor 11R is arranged so as to detect the magnetic field generated by the second magnetic member MG2. Specifically, the right magnetic sensor 11R is configured so as to output a lower voltage value as the S-pole portion of the second magnetic member MG2 approaches, i.e., as the second oscillating member 7 oscillates clockwise around the second oscillating axis AX2 in a front view. Therefore, the control device can detect the oscillating state of the second oscillating member 7 based on the magnitude of the voltage values output by the left magnetic sensor 11L and the right magnetic sensor 11R.

As shown in FIG. 12B, the first magnetic member MG1 and the fifth magnetic member MG5 (lower cover member 4D) are arranged such that the magnetic attraction force (hereinafter referred to as the "third attraction force") acting between the first magnetic member MG1 and the fifth magnetic member MG5 (lower cover member 4D) increases as the second oscillating member 7 oscillates counterclockwise around the second oscillating axis AX2 in front view. Specifically, the first magnetic member MG1 and the fifth magnetic member MG5 (lower cover member 4D) are arranged such that the distance between the first magnetic member MG1 and the fifth magnetic member MG5 (lower cover member 4D) decreases as the second oscillating member 7 oscillates counterclockwise around the second oscillating axis AX2 in front view.

As shown in FIG. 12B, the fourth magnetic member MG4 and the sixth magnetic member MG6 (upper cover member 4U) are arranged so that the magnetic attraction force (hereinafter referred to as the "fourth attraction force") acting between the fourth magnetic member MG4 and the sixth magnetic member MG6 (upper cover member 4U) increases as the second oscillating member 7 oscillates counterclockwise around the second oscillating axis AX2 in front view. Specifically, the fourth magnetic member MG4 and the sixth magnetic member MG6 (upper cover member 4U) are arranged so that the distance between the fourth magnetic member MG4 and the sixth magnetic member MG6 (upper cover member 4U) decreases as the second oscillating member 7 oscillates counterclockwise around the second oscillating axis AX2 in front view.

The driving force by the second driving unit DM2 for swinging the second oscillating member 7 in the counterclockwise direction tends to become smaller as the second oscillating member 7 swings in the counterclockwise direction. This is because the second driving unit DM2 is composed of the second shape memory alloy wire 9B, and the contraction rate of the second shape memory alloy wire 9B becomes smaller as the second shape memory alloy wire 9B contracts. Therefore, the third suction force and the fourth suction force act to compensate for the decrease in the driving force by the second driving unit DM2.

As shown in FIG. 12B, the second magnetic member MG2 and the fifth magnetic member MG5 (lower cover member 4D) are arranged so that the fifth magnetic attractive force acting between the second magnetic member MG2 and the fifth magnetic member MG5 (lower cover member 4D) increases as the second oscillating member 7 oscillates clockwise around the second oscillating axis AX2 in front view. Specifically, the second magnetic member MG2 and the fifth magnetic member MG5 (lower cover member 4D) are arranged so that the distance between the second magnetic member MG2 and the fifth magnetic member MG5 (lower cover member 4D) decreases as the second oscillating member 7 oscillates clockwise around the second oscillating axis AX2 in front view.

As shown in FIG. 12B, the third magnetic member MG3 and the sixth magnetic member MG6 (upper cover member 4U) are arranged such that the sixth magnetic attractive force acting between the third magnetic member MG3 and the sixth magnetic member MG6 (upper cover member 4U) increases as the second oscillating member 7 oscillates clockwise around the second oscillating axis AX2 in front view. Specifically, the third magnetic member MG3 and the sixth magnetic member MG6 (upper cover member 4U) are arranged such that the distance between the third magnetic member MG3 and the sixth magnetic member MG6 (upper cover member 4U) decreases as the second oscillating member 7 oscillates clockwise around the second oscillating axis AX2 in front view.

The driving force by the second drive unit DM2 for swinging the second oscillating member 7 in the clockwise direction tends to become smaller as the second oscillating member 7 swings in the clockwise direction, similar to the driving force by the second drive unit DM2 for swinging the second oscillating member 7 in the counterclockwise direction. Therefore, the fifth suction force and the sixth suction force act to compensate for the decrease in the driving force by the second drive unit DM2.

In this way, the first magnetic member MG1 to the sixth magnetic member MG6 function as the second auxiliary means AM2 that assists the driving force by the second drive unit DM2 to oscillate the second oscillating member 7 around the second oscillating axis AX2. Note that, below, the first auxiliary means AM1 and the second auxiliary means AM2 may be referred to as the auxiliary means AM for ease of explanation.

As described above, as shown in Figures 1A, 1B, 2, and 3, the camera module driving device 101 according to an embodiment of the present invention comprises a first oscillating member 2 capable of holding a camera module CM having a lens body LS and an image sensor IS, a second oscillating member 7 connected to the first oscillating member 2 so that the first oscillating member 2 can oscillate around a first axis (first oscillating axis AX1) that intersects with the optical axis direction, a fixed side member FB (base member 8) connected to the second oscillating member 7 so that the second oscillating member 7 can oscillate around a second axis (second oscillating axis AX2) that intersects with the optical axis direction and is perpendicular to the axial direction of the first axis (first oscillating axis AX1), and a drive unit DM that oscillates the first oscillating member 2 relative to the fixed side member FB so that the optical axis OA of the lens body LS is tilted. The drive unit DM is composed of multiple shape memory alloy wires 9 arranged between the movable side member MB, which includes the first oscillating member 2 and the second oscillating member 7, and the fixed side member FB.

This configuration does not require the magnets and coils required in configurations that use a voice coil motor system, so it is possible to reduce size compared to configurations that use a voice coil motor system.

As shown in FIG. 3, the drive unit DM may have a plurality of first shape memory alloy wires 9A (first inner wire 9A1 to fourth inner wire 9A4) provided between the first oscillating member 2 and the second oscillating member 7. Also, the plurality of shape memory alloy wires 9 provided between the movable side member MB and the fixed side member FB may be composed of a plurality of second shape memory alloy wires 9B (first outer wire 9B1 to fourth outer wire 9B4) provided between the second oscillating member 7 and the fixed side member FB (base member 8), as shown in FIG. 3.

The first shape memory alloy wire 9A may be arranged at two positions spaced apart in the axial direction of the second axis (second oscillation axis AX2) across the first oscillating member 2, as shown in FIG. 3. The second shape memory alloy wire 9B may be arranged at two positions spaced apart in the axial direction of the first axis (first oscillation axis AX1) across the first oscillating member 2, as shown in FIG. 3.

In this configuration, the second oscillating member 7 connected to the first oscillating member 2 is supported in a well-balanced manner by the shape memory alloy wires 9 at the front, rear, left and right positions of the first oscillating member 2. Therefore, this configuration has the effect of stabilizing the oscillation of the first oscillating member 2 (lens body LS).

Two first shape memory alloy wires 9A may be arranged at two positions spaced apart in the axial direction of the second axis (second oscillation axis AX2). The two first shape memory alloy wires 9A may cross each other when viewed along the axial direction of the second axis (second oscillation axis AX2) and form a first wire pair. In the example shown in FIG. 3, the first inner wire 9A1 and the second inner wire 9A2 form a first front wire pair as the first wire pair, and the third inner wire 9A3 and the fourth inner wire 9A4 form a first rear wire pair as the first wire pair.

Two second shape memory alloy wires 9B may be arranged at two positions spaced apart in the axial direction of the first axis (first oscillation axis AX1). These two second shape memory alloy wires 9B may cross each other when viewed along the axial direction of the first axis (first oscillation axis AX1) and form a second wire pair. In the example shown in FIG. 3, the first outer wire 9B1 and the second outer wire 9B2 form a second left-side wire pair as the second wire pair, and the third outer wire 9B3 and the fourth outer wire 9B4 form a second right-side wire pair as the second wire pair.

This configuration uses a pair of shape memory alloy wires 9 to oscillate the first oscillating member 2 (lens body LS), which has the effect of making the oscillation of the first oscillating member 2 (lens body LS) more stable than when a single shape memory alloy wire 9 is used to oscillate the first oscillating member 2 (lens body LS). In addition, this configuration can increase the length of the shape memory alloy wires 9 by arranging each of the two shape memory alloy wires 9 at an angle, compared to when they are arranged parallel to each other in the vertical direction (Z-axis direction). Therefore, if the contraction rate of the shape memory alloy wires 9 is the same, this configuration can increase the amount of oscillation of the first oscillating member 2 (lens body LS) compared to when the two shape memory alloy wires 9 are arranged parallel to each other in the vertical direction (Z-axis direction).

Preferably, the two first shape memory alloy wires 9A constituting the first wire pair are connected in series, and/or the two second shape memory alloy wires 9B constituting the second wire pair are connected in series. In the example shown in FIG. 3, the first inner wire 9A1 and the second inner wire 9A2 constituting the first front wire pair are connected in series, the third inner wire 9A3 and the fourth inner wire 9A4 constituting the first rear wire pair are connected in series, the first outer wire 9B1 and the second outer wire 9B2 constituting the second left wire pair are connected in series, and the third outer wire 9B3 and the fourth outer wire 9B4 constituting the second right wire pair are connected in series.

This configuration allows the current flowing through the two shape memory alloy wires 9 connected in series to be the same, which has the effect of preventing differences in the amount of contraction that occurs between the two shape memory alloy wires 9 when electricity is passed through them.

The first oscillating member 2 may have a first metal member 5A that connects two first shape memory alloy wires 9A that constitute the first wire pair in series. In this case, one end of each of the two first shape memory alloy wires 9A is fixed to the first metal member 5A. In the example shown in FIG. 3, the first oscillating member 2 is provided with a first front metal member 5AF that connects the first inner wire 9A1 and the second inner wire 9A2 that constitute the first front wire pair in series, and a first rear metal member 5AB that connects the third inner wire 9A3 and the fourth inner wire 9A4 that constitute the first rear wire pair in series. The first front metal member 5AF has one end (lower end) of each of the first inner wire 9A1 and the second inner wire 9A2 fixed thereto, and the first rear metal member 5AB has one end (lower end) of each of the third inner wire 9A3 and the fourth inner wire 9A4 fixed thereto.

In this configuration, there is no need to provide an electrical path in the first oscillating member 2 for passing a current from the outside to the first shape memory alloy wire 9A. Therefore, in this configuration, there is no need to embed a conductive member in the first oscillating member 2 by insert molding or the like. Therefore, this configuration has the effect of simplifying the structure of the first oscillating member 2.

The second oscillating member 7 may have a second metal member 5B to which one of the two first shape memory alloy wires 9A is fixed, and a third metal member 5C to which the other of the two first shape memory alloy wires 9A is fixed. In this case, the first metal member 5A, the second metal member 5B, and the third metal member 5C may each have a plate-shaped portion arranged approximately parallel to each other. In the example shown in FIG. 3, the second oscillating member 7 is provided with a second front metal member 5BF to which the other end (upper end) of the first inner wire 9A1 is fixed, and a third front metal member 5CF to which the other end (upper end) of the second inner wire 9A2 is fixed. As shown in FIG. 4B, the plate-shaped portion PT1 of the first front metal member 5AF, the plate-shaped portion PT2 of the second front metal member 5BF, and the plate-shaped portion PT3 of the third front metal member 5CF are arranged approximately parallel to each other with a gap GP therebetween. Since plate-shaped portion PT2 and plate-shaped portion PT3 are located on the same plane, plate-shaped portion PT2 is not visible in FIG. 4B. Therefore, in FIG. 4B, the leader line indicating the position of plate-shaped portion PT2 is drawn with a dashed line.

In this configuration, the first front metal member 5AF, the second front metal member 5BF, and the third front metal member 5CF are formed from the same metal member (metal plate), for example, by sheet metal processing. The first front metal member 5AF, the second front metal member 5BF, and the third front metal member 5CF can be provided as a module to which the first inner wire 9A1 and the second inner wire 9A2 are attached, as shown in FIG. 4. This configuration therefore has the effect of facilitating the assembly of the first front metal member 5AF, the second front metal member 5BF, and the third front metal member 5CF to the second oscillating member 7.

As shown in FIG. 6A, the second oscillating member 7 may have a first conductive member (first inner conductive member 15A) and a second conductive member (second inner conductive member 15B) made of metal embedded therein. Also, as shown in FIG. 8B, a first leaf spring member (first leaf spring 6A) and a second leaf spring member (second leaf spring 6B) made of metal may be provided between the second oscillating member 7 and the fixed side member FB (base member 8). And, as shown in FIG. 6A, the first conductive member (first inner conductive member 15A) may have a first connection portion (side connection portion 15sA) and a second connection portion (upper surface connection portion 15pA) exposed from the second oscillating member 7. Also, as shown in FIG. 6A, the second conductive member (second inner conductive member 15B) may have a third connection portion (side connection portion 15sB) and a fourth connection portion (upper surface connection portion 15pB) exposed from the second oscillating member 7. In this case, the first connection portion (side connection portion 15sA) may be connected to the second metal member 5B (second front metal member 5BF), and the third connection portion (side connection portion 15sB) may be connected to the third metal member 5C (third front metal member 5CF). Also, as shown in FIG. 8A, the second connection portion (top connection portion 15pA) may be connected to the first leaf spring 6A, and the fourth connection portion (top connection portion 15pB) may be connected to the second leaf spring 6B.

This configuration has the advantage of allowing a simple electrical path to be realized for passing current from the outside to the first shape memory alloy wire 9A.

The second oscillating member 7 may have a fourth metal member 5D that connects the two second shape memory alloy wires 9B that constitute the second wire pair in series. One end of each of the two second shape memory alloy wires 9B may be fixed to the fourth metal member 5D. In the example shown in FIG. 3, the second oscillating member 7 is provided with a fourth left metal member 5DL that connects in series the first outer wire 9B1 and the second outer wire 9B2 that constitute the second left wire pair as the second wire pair, and a fourth right metal member 5DR that connects in series the third outer wire 9B3 and the fourth outer wire 9B4 that constitute the second right wire pair as the second wire pair. One end (upper end) of each of the first outer wire 9B1 and the second outer wire 9B2 is fixed to the fourth left metal member 5DL, and one end (upper end) of each of the third outer wire 9B3 and the fourth outer wire 9B4 is fixed to the fourth right metal member 5DR.

In this configuration, the first front metal member 5AF that connects the first front wire pair in series and the first rear metal member 5AB that connects the first rear wire pair in series are provided on the first oscillating member 2, and the fourth left metal member 5DL that connects the second left wire pair in series and the fourth right metal member 5DR that connects the second right wire pair in series are provided on the second oscillating member 7. Therefore, this configuration has the effect of making it easier to ensure a conductive path for passing electricity through the shape memory alloy wire 9.

The first oscillating member 2 and the second oscillating member 7 may be configured so that the first oscillating member 2 can oscillate around a first axis (first oscillating axis AX1) relative to the second oscillating member 7 by means of a first shaft portion provided on one of the first oscillating member 2 and the second oscillating member 7 and a first receiving portion provided on the other of the first oscillating member 2 and the second oscillating member 7 and receiving the first shaft portion. In the example shown in FIG. 10, the first oscillating member 2 (lower holding body 2D) and the second oscillating member 7 are configured so that the lower holding body 2D can oscillate around the first axis (first oscillating axis AX1) relative to the second oscillating member 7 by a pair of shafts 2X (left shaft 2XL (see FIG. 5B) and right shaft 2XR) as the first shaft portion provided on the lower holding body 2D, and a pair of receivers 7S (left receiver 7SL (see FIG. 6A(c)) and right receiver 7SR) as the first receiver portion provided on the second oscillating member 7 to receive the pair of shafts 2X.

The second oscillating member 7 and the fixed side member FB may be configured so that the second oscillating member 7 can oscillate around the second axis (second oscillating axis AX2) with respect to the fixed side member FB by a second shaft portion provided on one of the second oscillating member 7 and the fixed side member FB and a second receiving portion provided on the other to receive the second shaft portion. In the example shown in FIG. 11, the second oscillating member 7 and the fixed side member FB (base member 8) are configured so that the second oscillating member 7 can oscillate around the second axis (second oscillating axis AX2) with respect to the base member 8 by a pair of shaft portions 7X (front shaft portion 7XF and rear shaft portion 7XB (see FIG. 6B)) as the second shaft portion provided on the second oscillating member 7 and a pair of receiving portions 8S (front receiving portion 8SF and rear receiving portion 8SB (see FIG. 7(c))) as the second receiving portion provided on the base member 8 to receive the pair of shaft portions 7X.

This configuration has the effect of enabling the rocking mechanism SM to be realized with a simple structure. Specifically, the rocking mechanism SM includes a first rocking mechanism SM1 and a second rocking mechanism SM2. The first rocking mechanism SM1 is easily realized by combining a pair of shaft portions 2X and a pair of receiving portions 7S, and the second rocking mechanism SM2 is easily realized by combining a pair of shaft portions 7X and a pair of receiving portions 8S.

The first receiving portion may have a concave portion that is open at least in the optical axis direction. A first biasing member may be provided between the first oscillating member 2 (lower holding body 2D) and the second oscillating member 7 to apply a force that presses the first shaft portion and the first receiving portion against each other.

In the example shown in FIG. 10, the right receiving portion 7SR has a concave portion that opens in the optical axis direction, i.e., a V-shaped groove shape that is concave upward. The same is true for the left receiving portion 7SL (see FIG. 6A(c)). As shown in FIG. 8C, between the lower holding body 2D and the second swinging member 7, there are provided leaf springs 6 (first leaf spring 6A to fourth leaf spring 6D) that function as first biasing members that apply a force to press the right shaft portion 2XR and the right receiving portion 7SR against each other and that apply a force to press the left shaft portion 2XL and the left receiving portion 7SL against each other. In the above embodiment, the inner portion 6i, the inner elastic arm portion 6g, and the center portion 6m of the leaf spring 6 function as the first biasing members.

The second receiving portion may have a concave portion that is open at least in the optical axis direction. A second biasing member may be provided between the second oscillating member 7 and the fixed side member FB (base member 8) to apply a force that presses the second shaft portion and the second receiving portion against each other.

In the example shown in FIG. 11, the front receiving portion 8SF has a concave portion that is open in the optical axis direction, that is, a V-shaped groove shape that is concave downward. The same is true for the rear receiving portion 8SB (see FIG. 7(c)). As shown in FIG. 8C, between the second rocking member 7 and the base member 8, there is provided a leaf spring 6 (first leaf spring 6A to fourth leaf spring 6D) that functions as a second biasing member that applies a force to press the front shaft portion 7XF and the front receiving portion 8SF (see FIG. 8A) against each other and that applies a force to press the rear shaft portion 7XB and the rear receiving portion 8SB (see FIG. 8A) against each other. In the above embodiment, the outer portion 6e, outer elastic arm portion 6f, and center portion 6m of the leaf spring 6 function as the second biasing member.

This configuration has the effect of suppressing rattle between the pair of shafts 2X and the pair of receiving portions 7S, and suppressing rattle between the pair of shafts 7X and the pair of receiving portions 8S.

The camera module driving device 101 may be configured such that the first direction (upward) in which the first biasing member biases the first oscillating member 2 toward the second oscillating member 7 (Z1 side) and the second direction (downward) in which the second biasing member biases the second oscillating member 7 toward the fixed side member FB (base member 8) (Z2 side) are opposite to each other.

This configuration is achieved by positioning the central portion 6m of the leaf spring 6 higher than the inner portion 6i and the outer portion 6e of the leaf spring 6. Therefore, compared to a configuration in which, for example, one of the inner portion 6i and the outer portion 6e of the leaf spring 6 is positioned higher than the central portion 6m and the other is positioned lower than the central portion 6m, this configuration has the effect of making it possible to reduce the height dimension of the camera module driving device 101.

5A and 5B, the first rocking member 2 may have a first frame-shaped portion (frame-shaped portion 2F) and a first shaft portion (left shaft portion 2XL and right shaft portion 2XR) composed of two protruding portions protruding outward from each of the two opposing side walls (left wall portion 2WL and right wall portion 2WR) of the first frame-shaped portion (frame-shaped portion 2F). Also, the second rocking member 7 may have a second frame-shaped portion (frame-shaped portion 7F) located outside the first frame-shaped portion (frame-shaped portion 2F) and a first receiving portion (left receiving portion 7SL and right receiving portion 7SR) composed of two recessed portions formed at the lower ends of each of the two opposing side walls (left wall portion 7WL and right wall portion 7WR) of the second frame-shaped portion (frame-shaped portion 7F), as shown in FIG. 6A. The first receiving portions (left receiving portion 7SL and right receiving portion 7SR) may be disposed above (on the subject side of) the first shaft portions (left shaft portion 2XL and right shaft portion 2XR). This configuration has the advantage of allowing the first rocking mechanism SM1 to be realized with a simple structure.

The first and second biasing members may be formed of the same leaf spring member (leaf spring 6). In the above-described embodiment, the first biasing member is realized by the inner portion 6i, the inner elastic arm portion 6g, and the central portion 6m of the leaf spring 6, and the second biasing member is realized by the central portion 6m, the outer elastic arm portion 6f, and the outer portion 6e of the leaf spring 6.

In this configuration, the leaf spring 6 is configured to function as both the first biasing member and the second biasing member. Therefore, this configuration has the effect of reducing the number of parts. In addition, this configuration has the effect of simplifying the assembly of the camera module driving device 101. However, the first biasing member and the second biasing member may be realized as separate members.

The leaf spring 6 may have a first fixed portion (inner portion 6i) fixed to the first oscillating member 2, a second fixed portion (central portion 6m) fixed to the second oscillating member 7, a third fixed portion (outer portion 6e) fixed to the fixed side member FB (base member 8), a first elastic arm portion (inner elastic arm portion 6g) provided between the first fixed portion (inner portion 6i) and the second fixed portion (central portion 6m), and a second elastic arm portion (outer elastic arm portion 6f) provided between the second fixed portion (central portion 6m) and the third fixed portion (outer portion 6e). In this case, the first fixed portion (inner portion 6i) may be fixed to the first oscillating member 2 in the vicinity of the first axis (first oscillating axis AX1). This means, for example, that the position of the portion where the inner portion 6i and the inner elastic arm portion 6g are connected is within a first predetermined distance from the first oscillating axis AX1 when viewed from above along the optical axis direction. The first predetermined distance is preferably smaller than the first distance between the first swing axis AX1 and the front wall 2WF of the first swing member 2, more preferably smaller than half of the first distance, and most preferably smaller than a quarter of the first distance. The second fixed portion (central portion 6m) may be fixed to the second swing member 7 in the vicinity of the second axis (second swing axis AX2). This means that, for example, the position of the portion where the central portion 6m and the outer elastic arm portion 6f are connected is within the range of the second predetermined distance from the second swing axis AX2 in a top view along the optical axis direction. The second predetermined distance is preferably smaller than the second distance between the second swing axis AX2 and the left wall 2WL of the first swing member 2, more preferably smaller than half of the second distance, and most preferably smaller than a quarter of the second distance.

This configuration has the effect of suppressing the force (torque) received from the leaf spring 6 when the movable member MB oscillates.

In addition, in the camera module driving device 101 according to an embodiment of the present invention, the driving unit DM may have a first driving unit DM1 that swings the first oscillating member 2 around a first axis (first oscillating axis AX1) and a second driving unit DM2 that swings the second oscillating member 7 around a second axis (second oscillating axis AX2). In this case, the camera module driving device 101 may be provided with an auxiliary means AM that assists in driving at least one of the first driving unit DM1 and the second driving unit DM2.

This configuration has the effect of ensuring that the movable member MB can be swung reliably by the auxiliary means AM even when the swing angle is large.

The auxiliary means AM preferably has a first magnetic member MG1 and a second magnetic member MG2 provided on one of the first oscillating member 2 and the second oscillating member 7, and a fixed magnetic member provided on the fixed side member FB. In this case, the first magnetic member MG1 and the second magnetic member MG2 are arranged to face each other across the second axis (second oscillating axis AX2) when viewed from above along the optical axis direction. Then, when the second oscillating member 7 oscillates in one direction around the second axis (second oscillating axis AX2), the first magnetic member MG1 is arranged so that the magnetic attraction force acting between the first magnetic member MG1 and the fixed magnetic member increases. Also, when the second oscillating member 7 oscillates in the other direction around the second axis (second oscillating axis AX2), the second magnetic member MG2 is arranged so that the magnetic attraction force acting between the second magnetic member MG2 and the fixed magnetic member increases.

In the above embodiment, the auxiliary means AM has a first magnetic member MG1 and a second magnetic member MG2 provided on the first oscillating member 2 (lower holding body 2D) as shown in FIG. 5B, and a cover member 4 as a fixed magnetic member. The first magnetic member MG1 and the second magnetic member MG2 are arranged to face each other across the second axis (second oscillating axis AX2) in a top view along the optical axis direction. The first magnetic member MG1 is arranged so that the magnetic attraction force acting between the first magnetic member MG1 and the fixed magnetic member (lower cover member 4D) increases when the first oscillating member 2 and the second oscillating member 7 are oscillated counterclockwise around the second oscillating axis AX2 in a front view as shown in FIG. 12B. In addition, the second magnetic member MG2 is positioned so that when the first oscillating member 2 and the second oscillating member 7 are oscillated clockwise around the second oscillating axis AX2 in a front view, the magnetic attraction force acting between the second magnetic member MG2 and the fixed magnetic member (lower cover member 4D) increases.

This configuration has the advantage that, even when the swing angle is large, the second swing member 7 can be reliably swung around the second axis (second swing axis AX2) by utilizing the magnetic attraction force acting between the magnetic members MG.

The auxiliary means AM preferably includes a first magnetic member MG1 and a second magnetic member MG2 provided on the first oscillating member 2, a third magnetic member MG3 and a fourth magnetic member MG4 provided on the second oscillating member 7, and a fifth magnetic member MG5 and a sixth magnetic member MG6 provided on the fixed side member FB (cover member 4).

In this case, the third magnetic member MG3 and the fourth magnetic member MG4 are arranged to face each other across the second axis (second oscillation axis AX2) when viewed from above along the optical axis direction.

The first magnetic member MG1 is positioned so that the magnetic attraction force acting between the first magnetic member MG1 and the fifth magnetic member MG5 increases when the second oscillating member 7 oscillates in one direction around the second axis (second oscillating axis AX2), and the fourth magnetic member MG4 is positioned so that the magnetic attraction force acting between the fourth magnetic member MG4 and the sixth magnetic member MG6 increases.

When the second oscillating member 7 oscillates in the other direction around the second axis (second oscillating axis AX2), the second magnetic member MG2 is positioned so that the magnetic attraction force acting between the second magnetic member MG2 and the fifth magnetic member MG5 increases, and the third magnetic member MG3 is positioned so that the magnetic attraction force acting between the third magnetic member MG3 and the sixth magnetic member MG6 increases.

In the above embodiment, the auxiliary means AM has a first magnetic member MG1 and a second magnetic member MG2 provided on the first oscillating member 2 (lower holding body 2D) as shown in Fig. 5B, a third magnetic member MG3 and a fourth magnetic member MG4 provided on the second oscillating member 7 as shown in Fig. 6A, and a lower cover member 4D as the fifth magnetic member MG5 and an upper cover member 4U as the sixth magnetic member MG6 shown in Fig. 12B. The third magnetic member MG3 and the fourth magnetic member MG4 are arranged to face each other across the second axis (second oscillating axis AX2) when viewed from above along the optical axis direction. As shown in FIG. 12B, the first magnetic member MG1 is arranged so that the magnetic attraction force acting between the first magnetic member MG1 and the fifth magnetic member MG5 (lower cover member 4D) increases when the first rocking member 2 and the second rocking member 7 are rocked counterclockwise around the second rocking axis AX2 in front view, and the fourth magnetic member MG4 is arranged so that the magnetic attraction force acting between the fourth magnetic member MG4 and the sixth magnetic member MG6 (upper cover member 4U) increases. The second magnetic member MG2 is arranged so that the magnetic attraction force acting between the second magnetic member MG2 and the fifth magnetic member MG5 increases when the first rocking member 2 and the second rocking member 7 are rocked clockwise around the second rocking axis AX2 in front view, and the third magnetic member MG3 is arranged so that the magnetic attraction force acting between the third magnetic member MG3 and the sixth magnetic member MG6 increases.

This configuration has the advantage that, even when the swing angle is large, the second swing member 7 can be reliably swung around the second axis (second swing axis AX2) by utilizing the magnetic attraction force acting between the magnetic members MG.

The movable magnetic members, ie, the first magnetic member MG1, the second magnetic member MG2, the third magnetic member MG3, and the fourth magnetic member MG4, may be composed of magnets.

This configuration has the effect of assisting the oscillation of the second oscillating member 7 around the second axis (second oscillating axis AX2) without providing a magnet on the fixed side member FB, i.e., without using magnets as the fixed magnetic members (fifth magnetic member MG5 and sixth magnetic member MG6).

The fixed side member FB may include a housing HS in which the first oscillating member 2 and the second oscillating member 7 are disposed. In this case, at least one of the fifth magnetic member MG5 and the sixth magnetic member MG6 may be formed by the housing HS. For example, at least one of the fifth magnetic member MG5 and the sixth magnetic member MG6 may be part of the housing HS.

This configuration allows the housing HS and the fixed magnetic member to be made of the same material, which has the effect of reducing the number of parts.

The first oscillating member 2 and the second oscillating member 7 may be configured such that the first oscillating member 2 can oscillate around a first axis (first oscillating axis AX1) relative to the second oscillating member 7 by a first shaft portion provided on one of the first oscillating member 2 and the second oscillating member 7 and a first receiving portion provided on the other of the first oscillating member 2 and the second oscillating member 7 and receiving the first shaft portion.

In the example shown in Figures 5A, 5B, 6A, and 6B, the first oscillating member 2 and the second oscillating member 7 are configured so that the first oscillating member 2 can oscillate around the first axis (first oscillating axis AX1) relative to the second oscillating member 7 by a pair of shafts 2X (left shaft 2XL and right shaft 2XR) as the first shaft portion provided on the first oscillating member 2, and a pair of receivers 7S (left receiver 7SL and right receiver 7SR) as the first receiver provided on the second oscillating member 7 to receive the pair of shafts 2X.

In this case, the first magnetic member MG1 and the third magnetic member MG3 are arranged facing each other with the left shaft portion 2XL in between, as shown by the dashed line in Figure 8C, and a magnetic force that attracts each other acts between the first magnetic member MG1 and the third magnetic member MG3. In the example shown in Figure 12B, the first magnetic member MG1 and the third magnetic member MG3 are arranged so that the north pole portion of the first magnetic member MG1 and the south pole portion of the third magnetic member MG3 face each other with synthetic resin in between.

As shown by the dashed line in FIG. 10(a), the second magnetic member MG2 and the fourth magnetic member MG4 are arranged facing each other with the right shaft portion 2XR in between, and a magnetic force that attracts the second magnetic member MG2 and the fourth magnetic member MG4 acts between them. In the example shown in FIG. 12B, the second magnetic member MG2 and the fourth magnetic member MG4 are arranged such that the north pole portion of the second magnetic member MG2 and the south pole portion of the fourth magnetic member MG4 face each other with synthetic resin in between.

A leaf spring 6 (first leaf spring 6A to fourth leaf spring 6D) may be provided between the first rocking member 2 and the second rocking member 7, which functions as a first biasing member that applies a force (biasing force) to the pair of shafts 2X (left shaft 2XL and right shaft 2XR) as the first shaft portion and the pair of receivers 7S (left receiver 7SL and right receiver 7SR) as the first receiver portion to press against each other. In the above embodiment, the inner portion 6i, inner elastic arm portion 6g, and center portion 6m of the leaf spring 6 function as the first biasing member.

This configuration has the effect that even if the biasing force of the first biasing member is not very strong, the biasing force can be compensated for by the magnetic force acting between the magnetic members MG. As shown in Figures 12A and 12B, the magnetic forces acting between the magnetic members MG are magnetic attractive forces acting between the first magnetic member MG1 and the third magnetic member MG3, between the second magnetic member MG2 and the fourth magnetic member MG4, between the seventh magnetic member MG7 and the ninth magnetic member MG9, and between the eighth magnetic member MG8 and the tenth magnetic member MG10.

A first magnetic sensor may be provided on the fixed side member FB. In this case, the first magnetic sensor may include a magnetic sensor arranged at a position facing the first magnetic member MG1 or the third magnetic member MG3 in the optical axis direction, and a magnetic sensor arranged at a position facing the second magnetic member MG2 or the fourth magnetic member MG4 in the optical axis direction.

In the example shown in FIG. 2, the insulating substrate 10 serving as the fixed side member FB is provided with first magnetic sensors (left magnetic sensor 11L and right magnetic sensor 11R). As shown in FIG. 12B, the first magnetic sensors include a left magnetic sensor 11L arranged at a position facing the first magnetic member MG1 in the optical axis direction, and a right magnetic sensor 11R arranged at a position facing the second magnetic member MG2 in the optical axis direction.

In this configuration, the first magnetic sensor can detect the amount of oscillation of the second oscillating member 7 around the second oscillating axis AX2 by using the magnetic fields generated by the first magnetic member MG1 and the second magnetic member MG2.

The auxiliary means AM may have a seventh magnetic member MG7 and an eighth magnetic member MG8 provided on a portion of the first oscillating member 2 located on the second axis (second oscillating axis AX2) when viewed from above along the optical axis direction as shown in FIG. 5B. The auxiliary means AM may also have a ninth magnetic member MG9 and a tenth magnetic member MG10 provided on a portion of the second oscillating member 7 located on the second axis (second oscillating axis AX2) when viewed from above along the optical axis direction as shown in FIG. 6B.

In this case, at least one of the seventh magnetic member MG7 and the ninth magnetic member MG9 is a magnet, and at least one of the eighth magnetic member MG8 and the tenth magnetic member MG10 is a magnet.

The seventh magnetic member MG7 and the ninth magnetic member MG9 are arranged so that the magnetic attraction force acting between the seventh magnetic member MG7 and the ninth magnetic member MG9 increases when the first oscillating member 2 oscillates in one direction around the first axis (first oscillating axis AX1). For example, as shown in FIG. 12A, the seventh magnetic member MG7 and the ninth magnetic member MG9 are arranged so that the north pole portion of the seventh magnetic member MG7 and the south pole portion of the ninth magnetic member MG9 face each other with synthetic resin between them in the optical axis direction.

The eighth magnetic member MG8 and the tenth magnetic member MG10 are arranged so that the magnetic attraction force acting between the eighth magnetic member MG8 and the tenth magnetic member MG10 increases when the first oscillating member 2 oscillates in the other direction around the first axis (first oscillating axis AX1). For example, the eighth magnetic member MG8 and the tenth magnetic member MG10 are arranged so that the north pole portion of the eighth magnetic member MG8 and the south pole portion of the tenth magnetic member MG10 face each other with synthetic resin between them in the optical axis direction, as shown in FIG. 12A.

In the above embodiment, each of the seventh magnetic member MG7 to the tenth magnetic member MG10 is a permanent magnet that is bipolarly magnetized in the Z-axis direction.

The seventh magnetic member MG7 and the ninth magnetic member MG9 are arranged such that, as shown in FIG. 12A, when the first oscillating member 2 is oscillated clockwise around the first oscillating axis AX1 as viewed from the right side, the north pole portion of the seventh magnetic member MG7 and the south pole portion of the ninth magnetic member MG9 approach each other, and the magnetic attraction force acting between the seventh magnetic member MG7 and the ninth magnetic member MG9 increases.

The eighth magnetic member MG8 and the tenth magnetic member MG10 are also arranged such that, as shown in FIG. 12A, when the first oscillating member 2 is oscillated counterclockwise around the first oscillating axis AX1 in a right side view, the N pole portion of the eighth magnetic member MG8 and the S pole portion of the tenth magnetic member MG10 approach each other, and the magnetic attraction force acting between the eighth magnetic member MG8 and the tenth magnetic member MG10 increases.

This configuration has the effect of allowing the magnetic force acting between the magnetic members MG to assist the swing of the first oscillating member 2 around the first oscillating axis AX1 by the first drive unit DM1. This configuration also has the effect of allowing the first oscillating member 2 to be reliably oscillated around the first axis (first oscillating axis AX1) by utilizing the magnetic attraction force acting between the magnetic members MG, even when the swing angle is large.

The eighth magnetic member MG8 may be composed of a magnet. In this case, a second magnetic sensor (rear magnetic sensor 11B) that detects the magnetic field from the eighth magnetic member MG8 may be provided on the fixed side member FB so as to be positioned outside the eighth magnetic member MG8 and spaced apart along the direction of the second axis (second oscillation axis AX2).

In the above embodiment, the eighth magnetic member MG8 is composed of a permanent magnet magnetized with two poles in the Z-axis direction. As shown in FIG. 12A, a rear magnetic sensor 11B serving as a second magnetic sensor for detecting the magnetic field from the eighth magnetic member MG8 is provided on the fixed side member FB (the tongue portion 10T of the insulating substrate 10 shown in FIG. 2) so as to be spaced apart from the eighth magnetic member MG8 along the second axis (second oscillation axis AX2) on the outer side (X2 side) of the eighth magnetic member MG8.

In this configuration, the second magnetic sensor (rear magnetic sensor 11B) can detect the amount of oscillation of the first oscillating member 2 around the first oscillating axis AX1 by using the magnetic field generated by the eighth magnetic member MG8.

The above describes preferred embodiments of the present invention in detail. However, the present invention is not limited to the above-described embodiments. Various modifications and substitutions can be applied to the above-described embodiments without departing from the scope of the present invention. Furthermore, each of the features described with reference to the above-described embodiments may be combined as appropriate, provided that there is no technical contradiction.

For example, in the above embodiment, the first front wire pair consisting of the first inner wire 9A1 and the second inner wire 9A2 is arranged on the front side (X1 side) of the first oscillating member 2, the first rear wire pair consisting of the third inner wire 9A3 and the fourth inner wire 9A4 is arranged on the rear side (X2 side) of the first oscillating member 2, the second left wire pair consisting of the first outer wire 9B1 and the second outer wire 9B2 is arranged on the left side (Y1 side) of the first oscillating member 2, and the second right wire pair consisting of the third outer wire 9B3 and the fourth outer wire 9B4 is arranged on the right side (Y2 side) of the first oscillating member 2. However, the number of shape memory alloy wires 9 arranged on at least one of the front side, rear side, left side, and right side of the first oscillating member 2 may be one. In this case, one shape memory alloy wire 9 may be fixed or supported at three points, namely, both ends and the center, so as to be bent into a V-shape or an inverted V-shape. For example, a single shape memory alloy wire 9 arranged on the front side of the first oscillating member 2 may have its center hooked on a protrusion formed on the front wall portion 7WF of the second oscillating member 7, and both ends fixed to the first front metal member 5AF. In this case, the first front metal member 5AF is separated into two.

In addition, in the above embodiment, the position of the movable side member MB is detected based on the output of the magnetic sensor 11, but it may also be detected based on the output of another sensor, such as a sensor that detects the resistance value of the shape memory alloy wire 9.

In addition, in the above-described embodiment, the metal member 5 is fixed to the fixed object (the first oscillating member 2 (lower holding body 2D), the second oscillating member 7, or the base member 8) by adhesive or welding, but it may be embedded in the fixed object or may be a conductive pattern formed on the surface of the fixed object.

2...First swinging member 2A...Outer wall 2B...Upper plate 2D...Lower holding body 2F...Frame-like part 2K...Opening 2T...Protruding part 2U...Upper holding body 2XL...Left shaft part 2XR...Right shaft part 2WB...Rear wall part 2WF...Front wall part 2WL...Left wall part 2WR...Right wall part 3...Flexible cable 4...Cover member 4A...Outer wall part 4A1...First side plate part 4A2...Second side plate part 4A3...Third side plate part 4A4...Fourth side plate part 4B...Top plate part 4C...Bottom part 4D...Lower cover member 4K...Opening 4S...Accommodating part 4U...Upper cover member 4WL...Left wall part 4WR...Right wall part 5...Metal member 5A...First metal member 5B...Second metal member 5C...Third metal member 5D...Fourth metal member 5E...Fifth metal member 5F...Sixth metal member 5AB...First rear metal member 5AF...First front metal member 5BB...Second rear metal member 5BF...Second front metal member 5CB...Third rear metal member 5CF...Third front metal member 5DL...Fourth left side metal member 5DR...Fourth right side metal member 5EL...Fifth left side metal member 5ER...Fifth right side metal member 5FL...Sixth left side metal member 5FR...Sixth right side metal member 6...Leaf spring 6A...First leaf spring 6B...Second leaf spring 6C...Third leaf spring 6D...Fourth leaf spring 6H1...First through hole 6H2...Second through hole 6H3...Third through hole 6H4...Fourth through hole 6eA to 6eD...Outer portion 6fA to 6fD: Outer elastic arm portion 6gA to 6gD: Inner elastic arm portion 6iA to 6iD: Inner portion 6mA to 6mD: Central portion 7: Second swing member 7F: Frame-shaped portion 7SL: Left receiving portion 7SR: Right receiving portion 7XB: Rear axle portion 7XF: Front axle portion 7WB: Rear wall portion 7WF: Front wall portion 7WL: Left wall portion 7WR: Right wall portion 8: Base member 8D1: First pedestal portion 8D2: Second pedestal portion 8D3: Third pedestal portion 8D4: Fourth pedestal portion 8F: Frame-shaped portion 8SB: Rear receiving portion 8SF: Front receiving portion 8WB: Rear wall portion 8WF: Front wall portion 8WL: Left wall portion 8WR: Right wall portion 9: Shape memory alloy wire 9A: First shape memory alloy wire 9A1...First inner wire 9A2...Second inner wire 9A3...Third inner wire 9A4...Fourth inner wire 9B...Second shape memory alloy wire 9B1...First outer wire 9B2...Second outer wire 9B3...Third outer wire 9B4...Fourth outer wire 10...Insulating substrate 10B...Rear side portion 10L...Left side portion 10R...Right side portion 10T...Tongue portion 11...Magnetic sensor 11B...Rear magnetic sensor 11L...Left magnetic sensor 11R...Right magnetic sensor 15A...First inner conductive member 15B...Second inner conductive member 15C...Third inner conductive member 15D...Fourth inner conductive member 15pA to 15pD...Top surface connection portion 15sA to 15sD...Side surface connection portion 16A...First outer conductive member 16B...Second outer conductive member 16C...Third outer conductive member 16D...Fourth outer conductive member 16E...Fifth outer conductive member 16F...Sixth outer conductive member 16G...Seventh outer conductive member 16H...Eighth outer conductive member 16pA to 16pD...Top surface connection portion 16sE to 16sH...Side surface connection portion 16tA to 16tH...Terminal portion 101...Camera module driving device AH1, AH2...Rectangular hole AM...Auxiliary means AM1...First auxiliary means AM2...Second auxiliary means AX1...First oscillation axis AX2...Second oscillation axis CB...Substrate CM...Camera module DM...Driver DM1...First drive unit DM2...Second drive unit FB...Fixed side member HS...Housing ID...Imaging device IS...Imaging element J1 to J4...Holding portion LD...Lens driving device LS...Lens body MB...Movable side member MG1: First magnetic member MG2: Second magnetic member MG3: Third magnetic member MG4: Fourth magnetic member MG5: Fifth magnetic member MG6: Sixth magnetic member MG7: Seventh magnetic member MG8: Eighth magnetic member MG9: Ninth magnetic member MG10: Tenth magnetic member OA: Optical axis PT1-PT3: Plate-shaped portion RH1, RH2: Round hole SH: Sensor holder SM: Swing mechanism SM1: First swing mechanism SM2: Second swing mechanism

Claims (16)

a first swing member capable of holding a camera module having a lens body and an image sensor;
a second swing member connected to the first swing member so that the first swing member can swing about a first axis line intersecting with an optical axis direction;
a fixed side member connected to the second swinging member so that the second swinging member can swing about a second axis that intersects with the optical axis direction and is perpendicular to the axial direction of the first axis;
a drive unit that swings the first swing member relative to the fixed member so that an optical axis of the lens body is tilted,
the drive unit includes a first drive unit that causes the first swing member to swing about the first axis and a second drive unit that causes the second swing member to swing about the second axis,
an auxiliary unit that assists driving of at least one of the first driving unit and the second driving unit ;
the auxiliary means includes a magnetic member and another magnetic member arranged apart from each other,
The more the optical axis of the lens body is tilted, the smaller the distance between the magnetic member and the other magnetic member becomes, and the magnetic attraction force acting between the magnetic member and the other magnetic member increases .
A camera module driving device comprising: a first swing member capable of holding a camera module having a lens body and an image sensor;
a second swing member connected to the first swing member so that the first swing member can swing about a first axis line intersecting with an optical axis direction;
a fixed side member connected to the second swinging member so that the second swinging member can swing about a second axis that intersects with the optical axis direction and is perpendicular to the axial direction of the first axis;
a drive unit that swings the first swing member relative to the fixed member so that an optical axis of the lens body is tilted,
the drive unit includes a first drive unit that causes the first swing member to swing about the first axis and a second drive unit that causes the second swing member to swing about the second axis,
an auxiliary unit that assists driving of at least one of the first driving unit and the second driving unit;
the auxiliary means includes a first magnetic member and a second magnetic member provided on one of the first swing member and the second swing member, and a fixed magnetic member provided on the fixed member,
the first magnetic member and the second magnetic member are disposed to face each other across the second axis when viewed from above along the optical axis direction,
the first magnetic member is disposed so that a magnetic attraction force acting between the first magnetic member and the fixed magnetic member increases when the second swing member swings in one direction around the second axis,
When the second oscillating member oscillates in the other direction around the second axis, the second magnetic member is disposed so that a magnetic attraction force acting between the second magnetic member and the fixed magnetic member increases.
A camera module driving device comprising : the auxiliary means includes the first magnetic member and the second magnetic member provided on the first swinging member, a third magnetic member and a fourth magnetic member provided on the second swinging member, and a fifth magnetic member and a sixth magnetic member provided on the fixed-side member,
the third magnetic member and the fourth magnetic member are disposed to face each other across the second axis when viewed from above along the optical axis direction,
the first magnetic member is disposed so that a magnetic attractive force acting between the first magnetic member and the fifth magnetic member which is the fixed magnetic member increases when the second oscillating member oscillates in one direction around the second axis, and the fourth magnetic member is disposed so that a magnetic attractive force acting between the fourth magnetic member and the sixth magnetic member increases,
When the second oscillating member oscillates in the other direction around the second axis, the second magnetic member is disposed so that a magnetic attractive force acting between the second magnetic member and the fifth magnetic member increases, and the third magnetic member is disposed so that a magnetic attractive force acting between the third magnetic member and the sixth magnetic member increases.
The camera module driving device according to claim 2 . the first magnetic member, the second magnetic member, the third magnetic member, and the fourth magnetic member are formed of magnets;
The camera module driving device according to claim 3 . the fixed member has a housing in which the first swing member and the second swing member are disposed,
At least one of the fifth magnetic member and the sixth magnetic member is formed by the housing.
The camera module driving device according to claim 4 . the first swing member and the second swing member are configured such that the first swing member can swing around the first axis with respect to the second swing member by a first shaft portion provided on one of the first swing member and the second swing member and a first receiving portion provided on the other of the first swing member and receiving the first shaft portion,
the first magnetic member and the third magnetic member are disposed opposite to each other with the first shaft portion therebetween, and a magnetic force that attracts the first magnetic member and the third magnetic member acts between them,
The second magnetic member and the fourth magnetic member are disposed opposite to each other with the first shaft portion interposed therebetween, and a magnetic force that attracts the second magnetic member and the fourth magnetic member acts between them.
6. The camera module driving device according to claim 4 or 5. A first biasing member is provided between the first swinging member and the second swinging member to apply a force such that the first shaft portion and the first receiving portion are pressed against each other.
The camera module driving device according to claim 6. The fixed member is provided with a first magnetic sensor,
the first magnetic sensor includes a magnetic sensor arranged at a position facing the first magnetic member or the third magnetic member in the optical axis direction, and a magnetic sensor arranged at a position facing the second magnetic member or the fourth magnetic member in the optical axis direction.
8. The camera module driving device according to claim 6 or 7. a first swing member capable of holding a camera module having a lens body and an image sensor;
a second swing member connected to the first swing member so that the first swing member can swing about a first axis line intersecting with an optical axis direction;
a fixed side member connected to the second swinging member so that the second swinging member can swing about a second axis that intersects with the optical axis direction and is perpendicular to the axial direction of the first axis;
a drive unit that swings the first swing member relative to the fixed member so that an optical axis of the lens body is tilted,
the drive unit includes a first drive unit that causes the first swing member to swing about the first axis line and a second drive unit that causes the second swing member to swing about the second axis line,
an auxiliary unit that assists driving of at least one of the first driving unit and the second driving unit;
The auxiliary means is
a seventh magnetic member and an eighth magnetic member provided on a portion of the first swing member that is located on the second axis line when viewed from above along the optical axis direction;
a ninth magnetic member and a tenth magnetic member provided in a portion of the second pivot member located on the second axis line in a top view along the optical axis direction,
At least one of the seventh magnetic member and the ninth magnetic member is a magnet,
At least one of the eighth magnetic member and the tenth magnetic member is a magnet,
the seventh magnetic member and the ninth magnetic member are disposed such that a magnetic attraction force acting between the seventh magnetic member and the ninth magnetic member increases when the first swing member swings in one direction around the first axis,
The eighth magnetic member and the tenth magnetic member are arranged so that a magnetic attraction force acting between the eighth magnetic member and the tenth magnetic member increases when the first oscillating member oscillates in the other direction around the first axis.
A camera module driving device comprising : the eighth magnetic member is formed of a magnet, and a second magnetic sensor that detects a magnetic field from the eighth magnetic member is provided on the fixed-side member so as to be positioned outside the eighth magnetic member and spaced apart along the second axis;
The camera module driving device according to claim 9. the first swing member and the second swing member are configured such that the first swing member can swing around the first axis with respect to the second swing member by a first shaft portion provided on one of the first swing member and the second swing member and a first receiving portion provided on the other of the first swing member and receiving the first shaft portion,
The second swinging member and the fixed-side member are configured such that the second swinging member can swing around the second axis with respect to the fixed-side member by a second shaft portion provided on one of the second swinging member and the fixed-side member and a second receiving portion provided on the other of the second swinging member and receiving the second shaft portion.
6. The camera module driving device according to claim 1. the first receiving portion has a concave portion that is open at least in the optical axis direction,
a first biasing member is provided between the first swinging member and the second swinging member to apply a force such that the first shaft portion and the first receiving portion are pressed against each other,
the second receiving portion has a concave portion that is open at least in the optical axis direction,
A second biasing member is provided between the second swinging member and the fixed member for applying a force such that the second shaft portion and the second receiving portion are pressed against each other.
The camera module driving device according to claim 11. a first direction in which the first pivoting member is biased toward the second pivoting member by the first biasing member and a second direction in which the second pivoting member is biased toward the fixed member by the second biasing member are opposite to each other.
The camera module driving device according to claim 12. the first swinging member has a first frame-shaped portion and the first shaft portion constituted by two protruding portions protruding outwardly from two opposing side wall portions of the first frame-shaped portion,
the second swinging member has a second frame portion located outside the first frame portion, and the first receiving portion is composed of two of the recessed portions formed at lower ends of two opposing side wall portions of the second frame portion,
The first receiving portion is disposed above the first shaft portion.
The camera module driving device according to claim 13. The first biasing member and the second biasing member are configured by the same leaf spring member.
15. The camera module driving device according to claim 12. the leaf spring member has a first fixed portion fixed to the first pivoting member, a second fixed portion fixed to the second pivoting member, a third fixed portion fixed to the fixed-side member, a first elastic arm portion provided between the first fixed portion and the second fixed portion, and a second elastic arm portion provided between the second fixed portion and the third fixed portion,
the first fixed portion is fixed to the first swing member in the vicinity of the first axis,
The second fixed portion is fixed to the second swing member in the vicinity of the second axis.
The camera module driving device according to claim 15.

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