JP7610975B2 - Optical unit with shake correction function - Google Patents

Description

The present invention relates to an optical unit with a shake correction function that corrects shake by rotating a camera module around an optical axis.

Among optical units mounted on mobile terminals and mobile objects, there are those that rotate a movable body equipped with a camera module around the optical axis, around a first axis intersecting the optical axis, and around a second axis intersecting the optical axis and the first axis in order to suppress distortion of captured images when the mobile terminal or mobile object is moving. Patent Document 1 describes this type of optical unit with shake correction function.

The optical unit with shake correction function of Patent Document 1 has a fixed body and a movable body supported rotatably around the optical axis relative to the fixed body. The movable body includes a camera module with a lens, a support body surrounding the camera module, and a gimbal mechanism that supports the camera module inside the support body rotatably around a first axis and a second axis. The optical unit with shake correction function also includes a swing magnetic drive mechanism that rotates the camera module around the first axis and the second axis in the movable body, a rotation support mechanism that supports the movable body rotatably around the optical axis, and a rolling magnetic drive mechanism that rotates the camera module around the optical axis by rotating the movable body around the optical axis.

In Patent Document 1, the rotation support mechanism includes a convex portion that protrudes from the bottom of the movable body to the rear in the optical axis direction, and a ball bearing that surrounds the convex portion. Patent Document 1 also describes, as other configuration examples of the rotation support mechanism, a configuration in which a pivot portion is provided at the bottom of the movable body instead of a ball bearing, and a configuration in which a rotation support mechanism is provided on the outer periphery of the movable body by forming a ball bearing by providing an arc-shaped convex surface on the side of the movable body.

JP 2015-82072 A

In the optical unit with shake correction function of Patent Document 1, a rotation support mechanism such as a ball bearing or pivot is provided behind the movable body in the optical axis direction. In such a configuration, the height of the optical unit with shake correction function in the optical axis direction becomes large, making it difficult to make the entire product thin in the optical axis direction. Patent Document 1 also describes a configuration in which a gimbal mechanism is provided inside the movable body and a rotation support mechanism is provided on the outer periphery of the movable body, but such a configuration results in a large external size of the entire product when viewed in the optical axis direction.

In Japanese Patent Application No. 2020-36404, the present inventors have filed an application for an optical unit with shake correction function in which a gimbal mechanism is provided outside the movable body and a rotation support mechanism is provided between the gimbal mechanism and the movable body. The rotation support mechanism in Japanese Patent Application No. 2020-36404 is configured such that a ball bearing with a rolling element inserted between two annular rail members facing each other in the optical axis direction is arranged to surround the lens barrel of the camera module, one rail is fixed to the end face of the movable body facing the subject, and the other rail is supported by the gimbal mechanism so as to be rotatable around a first axis. Therefore, there is no need to secure space for the rotation support mechanism behind the movable body in the optical axis direction and on the outer periphery of the movable body.

Here, the movable body of Japanese Patent Application No. 2020-36404 has a holder made of sheet metal that holds a camera module, and the strength of the holder is ensured by providing a holder end plate that protrudes inward from the holder frame that surrounds the camera module. In the rotation support mechanism, two rails that hold the rolling elements face each other in the optical axis direction, and a plate roll made of sheet metal that is connected to the gimbal frame overlaps the subject side of the two rails, and further, a stopper member made of sheet metal overlaps the subject side of the plate roll. The stopper member prevents the plate roll from coming off when an impact is applied.

In the configuration of Patent Application No. 2020-36404, many parts overlap in the optical axis direction on the subject side of the camera module, and furthermore, the holder end plate portion that covers the camera module and the rotation support mechanism overlap in the optical axis direction, resulting in a large product height in the optical axis direction. In addition, the large number of parts makes assembly work time-consuming, and the dimensional tolerances of the many parts pile up, resulting in large dimensional variation.

In view of these points, the object of the present invention is to reduce the product height in the optical axis direction and the number of parts in an optical unit with shake correction function that rotates a movable body around the optical axis.

In order to solve the above problems, the optical unit with shake correction function of the present invention has a movable body having a camera module, a rotational support mechanism that supports the movable body rotatably around the optical axis of the camera module, a gimbal mechanism that supports the rotational support mechanism rotatably around a first axis that intersects with the optical axis and a second axis that intersects with the optical axis and the first axis, and a fixed body that supports the movable body via the gimbal mechanism and the rotational support mechanism, the movable body having a resin holder that surrounds the outer periphery of the camera module and a first metal member fixed to the holder, the first member having a first annular plate portion that surrounds the optical axis and overlaps with the camera module when viewed from the optical axis direction, and a first annular plate portion that surrounds the optical axis and overlaps with the camera module when viewed from the optical axis direction. and a first extension portion connecting the plate portion and the holder. The rotation support mechanism includes a first annular groove formed in the first annular plate portion, a second annular plate portion having a second annular groove formed therein that faces the first annular groove in the optical axis direction, and a second member supported by the gimbal mechanism to be rotatable around the first axis. The rotation support mechanism includes a second member inserted into the first annular groove and the second annular groove and rolling between the first annular plate portion and the second annular plate portion. The holder includes a shake correction magnet of a shake correction magnetic drive mechanism that rotates the movable body around the first axis and the second axis, and the first extension portion is made of a magnetic metal, extends from the first annular plate portion to the outer periphery, bends to the other side in the optical axis direction, and is fixed to the inner periphery of the shake correction magnet.

According to the present invention, the movable body includes a resin holder that surrounds the outer periphery of the camera module and a first metal member that is fixed to the holder. The first member includes a first annular plate that surrounds the optical axis and overlaps with the camera module when viewed in the optical axis direction, and a first extension portion that connects the first annular plate and the holder and is made of magnetic metal and is fixed to the inner periphery of the shake correction magnet. In this way, by integrating the rail into which the rolling body of the rotation support mechanism is inserted and the yoke for the magnet of the shake correction magnetic drive mechanism into the first member, the number of parts can be reduced, improving the assembly of the movable body and the rotation support mechanism and reducing costs. In addition, by integrating the yoke into the first member, the positional accuracy of the yoke can be increased. Furthermore, by making the holder out of resin, strength can be ensured without providing an end plate portion that protrudes to the inner periphery at the end in the optical axis direction as in a sheet metal holder. Therefore, the height of the movable body in the optical axis direction can be reduced.

In the present invention, the shake correction magnetic drive mechanism includes a first shake correction magnetic drive mechanism that rotates the movable body around the first axis and a second shake correction magnetic drive mechanism that rotates the movable body around the second axis, the shake correction magnet includes a first magnet of the first shake correction magnetic drive mechanism and a second magnet of the second shake correction magnetic drive mechanism, the holder is fixed with a third magnet of a rolling correction magnetic drive mechanism that rotates the movable body around the optical axis, the first magnet, the second magnet, and the third magnet are arranged in a circumferential direction around the optical axis, and the first extension is preferably fixed to each position on the inner periphery side of the first magnet, the inner periphery side of the second magnet, and the inner periphery side of the third magnet. In this way, the yokes for the magnets of the shake correction magnetic drive mechanism and the rolling correction magnetic drive mechanism are all integrated into the first member. Therefore, the number of parts can be reduced, and the assembly of the movable body and the rotation support mechanism can be improved and costs can be reduced. Moreover, the positional accuracy of the yoke can be improved.

In the present invention, the second member includes a pair of second extensions protruding from the second annular plate portion to both sides in the first axial direction, and a pair of second protruding plate portions protruding from the second annular plate portion to both sides in the second axial direction, the pair of second extensions being connected to the gimbal mechanism, the second annular plate portion being disposed in a gap in the optical axis direction between the first annular plate portion and the camera module, and a stopper protrusion that faces the second member in the optical axis direction is preferably provided at a diagonal position in the first axial direction and a diagonal position in the second axial direction of the holder. In this way, the first annular plate portion functions as a stopper member that prevents the second annular plate portion from coming off. Therefore, since there is no need to separately place a stopper member that overlaps with the second annular plate portion in the optical axis direction, the height in the optical axis direction of the rotation support mechanism can be reduced. Therefore, the height in the optical axis direction of the optical unit with shake correction function can be reduced. In addition, the second annular plate portion provided on the second member can be prevented from coming off the first annular plate portion by the stopper protrusion provided on the holder. This prevents the second annular plate from falling off. In addition, the holder is made of resin, which makes it easier to form a complex uneven shape than a metal holder. This makes it easy to manufacture a holder with a stopper projection.

In the present invention, it is preferable that the first annular plate portion and the second annular plate portion overlap the camera module from one side in the optical axis direction, and the diagonal portion of the holder in the first axis direction and the diagonal portion of the holder in the second axis direction have ends on the other side in the optical axis direction recessed toward one side in the optical axis direction relative to the camera module. In this way, the height in the optical axis direction of the space through which the movable body moves when the movable body swings around the first axis and the second axis can be reduced. Therefore, the product height in the optical axis direction of the optical unit with shake correction function can be reduced. In addition, the holder is made of resin, and it is easier to form a complex uneven shape than a sheet metal holder. Therefore, it is easy to manufacture a holder with a recessed shape in the diagonal portion in the first axis direction and the diagonal portion in the second axis direction.

In the present invention, the first annular plate portion and the second annular plate portion overlap the camera module from one side in the optical axis direction, the holder has a plurality of side walls arranged in a circumferential direction surrounding the camera module, and at least one of the side walls arranged at an angular position intermediate between the first axis direction and the second axis direction is preferably provided with a convex portion that protrudes further toward the other side in the optical axis direction than the camera module. In this way, when the movable body collides with the fixed body due to a drop impact, the impact is applied to the convex portion, and it is possible to avoid applying the impact directly to the camera module.

In the present invention, the convex portion is preferably disposed at the center of the circumferential direction of the side wall. In this way, the convex portion is disposed at a position on the holder that is the shortest distance from the optical axis, in other words, at a position where the amount of movement in the optical axis direction is the smallest when the movable body is swung. Therefore, it is not necessary to increase the gap between the movable body and the fixed body in the optical axis direction in order to avoid the convex portion colliding with the fixed body when the movable body is swung, and therefore it is possible to avoid an increase in the product height in the optical axis direction of the optical unit with shake correction function.

In the present invention, it is preferable that the side surfaces on both sides in the circumferential direction of the convex portion are tapered surfaces that incline toward the other side in the optical axis direction as they approach the circumferential center of the convex portion. In this way, the convex portion has a shape in which the circumferential width of the base end is large, thereby increasing its strength. In addition, a shape in which the side surfaces are tapered is a shape in which the amount of protrusion is smaller in a portion that moves more in the optical axis direction when the movable body is swung. Therefore, there is no need to increase the gap between the movable body and the fixed body in the optical axis direction to avoid the convex portion colliding with the fixed body when the movable body is swung, so it is possible to avoid an increase in the product height in the optical axis direction of the optical unit with shake correction function.

In the present invention, the rotation support mechanism includes a pressurizing mechanism that applies a force that brings the first annular groove and the second annular groove closer to each other in the optical axis direction, and the pressurizing mechanism includes a first protruding plate portion that protrudes from the first annular plate portion toward the outer periphery and a pressurizing magnet that is fixed to a portion of the second member in the circumferential direction around the optical axis, and the first protruding plate portion is preferably made of a magnetic metal and is attracted to the pressurizing magnet. In this way, the components of the pressurizing mechanism can be integrated into the first member. Therefore, the number of components can be reduced and assembly can be improved. In addition, by mounting a pressurizing magnet on the second member that rotates relative to the movable body and providing the first protruding plate portion that is attracted to the pressurizing magnet on the movable body, it is possible to prevent the rotation position of the first protruding plate portion from being shifted due to being attracted to the magnets of the shake correction magnetic drive mechanism and the rolling correction magnetic drive mechanism mounted on the movable body. Therefore, it is possible to avoid the pressurizing mechanism being interfered with by the shake correction magnetic drive mechanism and the rolling correction magnetic drive mechanism. In addition, the pressure mechanism can determine the angular position of the movable body around the optical axis.

In the present invention, a rotation restriction mechanism for restricting the rotation range of the movable body around the optical axis is provided, and the rotation restriction mechanism preferably includes a first rotation restriction portion formed on the first member or the holder and a second rotation restriction portion formed on the second member, and one of the first rotation restriction portion and the second rotation restriction portion surrounds both sides of the other of the first rotation restriction portion and the second rotation restriction portion in the circumferential direction. In this way, the rotation restriction mechanism can be completed between the first member and the second member, or between the second member and the holder. Therefore, the rotation restriction mechanism can be configured without a stopper member that overlaps with the first member and the second member in the optical axis direction, so that the height of the rotation support mechanism in the optical axis direction can be reduced. In addition, since the rotation restriction mechanism can be configured with a small number of parts, it is possible to suppress a decrease in the dimensional accuracy of the rotation restriction mechanism due to the accumulation of part tolerances. Therefore, the rotation range of the movable body can be precisely restricted.

In the present invention, it is preferable that the first rotation restricting portion extends from the first annular plate portion toward the outer periphery and is fixed to the holder, and the second rotation restricting portion is disposed in a notch portion formed by cutting out a circumferential central portion of the first rotation restricting portion. In this way, the connection portion connecting the first annular plate portion and the holder can be used as the first rotation restricting portion, thereby simplifying the shape of the first member.

According to the present invention, the rail into which the rolling body of the rotation support mechanism is inserted and the yoke for the magnet of the shake correction magnetic drive mechanism are integrated into the first member, so that the number of parts can be reduced, improving the ease of assembly of the movable body and the rotation support mechanism and reducing costs. Also, by integrating the yoke into the first member, the positional accuracy of the yoke can be improved. Furthermore, by making the holder out of resin, strength can be ensured without providing an end plate portion that protrudes inward at the end in the optical axis direction as in a sheet metal holder. Therefore, the height of the movable body in the optical axis direction can be reduced.

FIG. 2 is a perspective view of an optical unit with a shake correction function. FIG. 2 is an exploded perspective view of an optical unit with a shake correction function. FIG. 2 is a plan view of the optical unit with shake correction function with the cover removed, as viewed from the subject side. FIG. 2 is an exploded perspective view of the optical unit with shake correction function with the cover and base removed. 4 is a cross-sectional view of the optical unit with shake correction function taken along the line AA in FIG. 3. 4 is a cross-sectional view of the optical unit with shake correction function taken along the line BB in FIG. 3. 2 is a perspective view of a gimbal frame and a gimbal frame receiving member. FIG. FIG. 2 is a perspective view of the movable body and the rotation support mechanism as viewed from the subject side. FIG. 2 is an exploded perspective view of a movable body and a rotation support mechanism. FIG. 2 is a perspective view of the movable body and the rotation support mechanism as viewed from the side opposite to the subject.

Below, an embodiment of an optical unit with shake correction function to which the present invention is applied will be described with reference to the drawings.

(Overall composition)
Fig. 1 is a perspective view of an optical unit with a shake correction function. Fig. 2 is an exploded perspective view of the optical unit with a shake correction function. Fig. 3 is a plan view of the optical unit with a shake correction function with a cover removed, as viewed from the subject side. Fig. 4 is an exploded perspective view of the optical unit with a shake correction function with a cover and a base removed.

As shown in FIG. 1, the optical unit 1 with shake correction function includes a movable body 10 equipped with a camera module 2, and a fixed body 11 surrounding the movable body 10 from the outside. The fixed body 11 includes a frame-shaped case 3 surrounding the movable body 10 from the outer periphery, a cover 4 fixed to the case 3 from the subject side, and a base 5 fixed to the case 3 from the opposite subject side and covering the movable body from the opposite subject side. The optical unit 1 with shake correction function also includes a flexible printed circuit board 6 pulled out from the movable body 10, and a flexible printed circuit board 7 routed along the outer periphery of the case 3.

The optical unit 1 with shake correction function is used in optical devices such as camera-equipped mobile phones and dashcams, as well as action cameras and wearable cameras mounted on moving objects such as helmets, bicycles and radio-controlled helicopters. In such optical devices, if the optical device shakes during shooting, the captured image will be distorted. In order to prevent the captured image from being tilted, the optical unit 1 with shake correction function corrects the tilt of the camera module 2 based on the acceleration, angular velocity, amount of shake, etc. detected by detection means such as a gyroscope.

The camera module 2 includes a lens 2a and an image sensor 2b arranged on the optical axis L of the lens 2a (see Figs. 5 and 6). The optical unit 1 with shake correction function performs shake correction by rotating the camera module 2 around the optical axis L of the lens 2a, around a first axis R1 perpendicular to the optical axis L, and around a second axis R2 perpendicular to the optical axis L and the first axis R1.

In the following description, the three mutually orthogonal axes are defined as the X-axis direction, the Y-axis direction, and the Z-axis direction. Furthermore, one side in the X-axis direction is defined as the -X direction, and the other side as the +X direction. One side in the Y-axis direction is defined as the -Y direction, and the other side as the +Y direction. One side in the Z-axis direction is defined as the -Z direction, and the other side as the +Z direction. The Z-axis direction is the direction of the optical axis L. The -Z direction is the side of the camera module 2 opposite the subject, and the +Z direction is the subject side of the camera module 2. The first axis R1 and the second axis R2 are inclined 45 degrees around the Z axis (around the optical axis) with respect to the X-axis and Y-axis.

The optical unit 1 with shake correction function has a rotation support mechanism 12 that supports the movable body 10 so that it can rotate around the Z axis, and a gimbal mechanism 13. The gimbal mechanism 13 supports the rotation support mechanism 12 so that it can rotate around the first axis R1, and also supports the rotation support mechanism 12 so that it can rotate around the second axis R2. The movable body 10 is supported by the fixed body 11 via the rotation support mechanism 12 and the gimbal mechanism 13 in a state where it can rotate around the first axis R1 and the second axis R2.

As shown in FIG. 3, the gimbal mechanism 13 includes a gimbal frame 14 and a first connection mechanism 15 that connects the gimbal frame 14 and the rotation support mechanism 12 to be rotatable around a first axis R1. The first connection mechanism 15 is provided on both sides of the gimbal frame 14 in the direction of the first axis R1. The gimbal mechanism 13 also includes a second connection mechanism 16 that connects the gimbal frame 14 and the fixed body 11 to be rotatable around a second axis R2. The second connection mechanism 16 is provided on both sides of the gimbal frame 14 in the direction of the second axis R2.

The optical unit 1 with shake correction function also includes a shake correction magnetic drive mechanism 20 that rotates the movable body 10 around the first axis R1 and the second axis R2. As shown in FIG. 3, the shake correction magnetic drive mechanism 20 includes a first shake correction magnetic drive mechanism 21 that generates a drive force around the X axis for the movable body 10, and a second shake correction magnetic drive mechanism 22 that generates a drive force around the Y axis for the movable body 10. The first shake correction magnetic drive mechanism 21 and the second shake correction magnetic drive mechanism 22 are arranged in the circumferential direction around the Z axis. In this example, the first shake correction magnetic drive mechanism 21 is disposed in the -X direction of the camera module 2. The second shake correction magnetic drive mechanism 22 is disposed in the -Y direction of the camera module 2.

The movable body 10 rotates around the X-axis and the Y-axis by combining the rotation around the first axis R1 and the rotation around the second axis R2. This allows the optical unit 1 with shake correction function to perform pitch correction around the X-axis and yawing correction around the Y-axis.

The optical unit 1 with shake correction function further has a magnetic drive mechanism 23 for rolling correction that rotates the movable body 10 around the Z axis. As shown in FIG. 3, the first magnetic drive mechanism 21 for shake correction, the second magnetic drive mechanism 22 for shake correction, and the magnetic drive mechanism 23 for rolling correction are arranged in the circumferential direction around the Z axis. In this example, the magnetic drive mechanism 23 for rolling correction is disposed in the +Y direction of the camera module 2. The magnetic drive mechanism 23 for rolling correction is located on the opposite side to the second magnetic drive mechanism 22 for shake correction, with the optical axis L sandwiched therebetween.

(Fixed body)
In the fixed body 11, the cover 4 and the base 5 are plate-shaped and made of a non-magnetic metal. Hooks 8 bent at approximately a right angle toward the case 3 are formed on the outer periphery of the cover 4 and the base 5. The case 3 is made of resin. The hooks 8 are engaged with protrusions 9 provided on the outer periphery of the case 3. The gimbal mechanism 13 and the camera module 2 are disposed inside the opening 4a of the cover 4 and protrude from the cover 4 in the +Z direction.

The case 3 comprises a rectangular frame portion 18 that surrounds the movable body 10 and the rotation support mechanism 12 from the outer periphery, and a rectangular wiring accommodating portion 19 that is arranged in the +X direction of the frame portion 18. The frame portion 18 comprises a first side plate portion 181 and a second side plate portion 182 that face each other in the X direction, and a third side plate portion 183 and a fourth side plate portion 184 that face each other in the Y direction. The first side plate portion 181 is located in the -X direction of the second side plate portion 182. The third side plate portion 183 is located in the -Y direction of the fourth side plate portion 184.

4, the frame 18 has a notch 185 formed by cutting out the -Z direction edge of the second side plate 182. A flexible printed circuit board 6 connected to the imaging element 2b is drawn out in the +X direction from the -Z direction end portion of the movable body 10. The flexible printed circuit board 6 is drawn out in the +X direction of the frame 18 through the notch 185 and is housed in the wiring housing 19.

The wiring housing 19 has a fifth side plate 191 and a sixth side plate 192 that face each other in the Y-axis direction, and a seventh side plate 193 that faces the second side plate 182 of the frame 18 in the X-axis direction. The wiring housing 19 has a notch 194 formed by cutting out the edge of the seventh side plate 193 in the -Z direction. The flexible printed circuit board 6 is routed inside the wiring housing 19 in a shape that is folded back multiple times, and is pulled out to the outside of the wiring housing 19 through the notch 194.

As shown in FIG. 4, a first coil fixing hole 183a is provided in the third side plate portion 183 of the case 3. The first coil 21C is fixed in the first coil fixing hole 183a. A second coil fixing hole 181a is provided in the first side plate portion 181 of the case 3. The second coil 22C is fixed in the second coil fixing hole 181a. The first coil 21C and the second coil 22C are oval air-core coils that are elongated in the circumferential direction. In addition, a third coil fixing hole 184a is provided in the fourth side plate portion 184. The third coil 23C is disposed in the third coil fixing hole 184a. The third coil 23C is an air-core coil that is elongated in the Z-axis direction.

As shown in FIG. 3, the first coil 21C fixed to the third side plate 183 and the first magnet 21M fixed to the side surface of the movable body 10 in the -Y direction face each other in the Y direction, forming a first magnetic drive mechanism 21 for shake correction. The second coil 22C fixed to the first side plate 181 and the second magnet 22M fixed to the side surface of the movable body 10 in the -X direction face each other in the X direction, forming a second magnetic drive mechanism 22 for shake correction. The third coil 23C fixed to the fourth side plate 184 and the third magnet 23M fixed to the side surface of the movable body 10 in the +Y direction face each other in the Y direction, forming a magnetic drive mechanism 23 for rolling correction.

The first coil 21C, the second coil 22C, and the third coil 23C are electrically connected to the flexible printed circuit board 7. The flexible printed circuit board 7 is fixed to the outer peripheral surface of the frame portion 18. In this embodiment, the flexible printed circuit board 7 is routed along the outer peripheral surfaces of the fourth side plate portion 184, the first side plate portion 181, and the third side plate portion 183 of the frame portion 18, in that order.

A magnetic plate 17 (see Figs. 1 and 2) is fixed to the flexible printed circuit board 7 at two locations: a position overlapping the center of the first coil 21C and a position overlapping the center of the second coil 22C. The magnetic plate 17 overlapping the first coil 21C and the first magnet 21M form a magnetic spring for returning the movable body 10 to a reference angle position in the rotation direction around the X-axis. The magnetic plate 17 overlapping the second coil 22C and the second magnet 22M form a magnetic spring for returning the movable body 10 to a reference angle position in the rotation direction around the Y-axis. In addition, a swing position sensor and a rotation position sensor (not shown) are arranged on the flexible printed circuit board 7. The optical unit 1 with shake correction function acquires the angular positions of the movable body 10 in the rotation directions around the X-axis, Y-axis, and Z-axis based on the outputs of these sensors.

(Gimbal mechanism)
Fig. 5 and Fig. 6 are cross-sectional views of the optical unit with shake correction function. Fig. 5 is a cross-sectional view taken along line A-A in Fig. 2, and Fig. 6 is a cross-sectional view taken along line B-B in Fig. 2. Fig. 7 is an exploded perspective view of the gimbal frame 14, the first gimbal frame receiving member 151, and the second gimbal frame receiving member 162.

As shown in FIGS. 3 and 6, second connection mechanisms 1 are provided at diagonal positions in the direction of the second axis R2 of the frame portion 18, respectively, for connecting the gimbal frame 14 and the fixed body 11 to be rotatable around the second axis R2.
6 is provided. A pair of recesses 161 are provided at diagonal positions in the second axis R2 direction of the frame portion 18, and a second gimbal frame receiving member 162 is fixed to each of them. As shown in Figs. 6 and 7, the second gimbal frame receiving member 162 includes a sphere 163 and a second thrust receiving member 164 to which the sphere 163 is fixed. As shown in Fig. 6, by fixing the second gimbal frame receiving member 162 to the recesses 161, the sphere 163 is supported by the fixed body 11 at a position on the second axis R2. When assembling the gimbal mechanism 13, the gimbal frame 14 is inserted into the inner peripheral side of the second gimbal frame receiving member 162 and brought into point contact with the sphere 163 on the second axis R2. In this way, the second connection mechanism 16 is configured.

3 and 5, a first connection mechanism 15 is provided on both sides of the movable body 10 in the first axis R1 direction to connect the gimbal frame 14 and the rotation support mechanism 12 to be rotatable around the first axis R1. The first connection mechanism 15 includes a first gimbal frame support member 151 fixed to the rotation support mechanism 12 on both sides of the movable body 10 in the first axis R1 direction. As shown in FIGS. 5 and 7, the first gimbal frame support member 151 includes a sphere 152 and a first thrust support member 153 to which the sphere 152 is fixed. By fixing the first thrust support member 153 to the rotation support mechanism 12, the sphere 152 is supported by the rotation support mechanism 12 at a position on the first axis R1. When assembling the gimbal mechanism 13, the gimbal frame 14 is inserted into the inner periphery of the first gimbal frame support member 151 and brought into point contact with the sphere 152 on the first axis R1. This forms the first connection mechanism 15.

The gimbal frame 14 is made of a metal leaf spring. As shown in Figures 5, 6, and 7, the gimbal frame 14 includes a gimbal frame main body 140 located in the +Z direction of the movable body 10, a pair of first axis side extensions 141 that protrude from the gimbal frame main body 140 toward both sides in the direction of the first axis R1 and extend in the -Z direction, and a pair of second axis side extensions 142 that protrude from the gimbal frame main body 140 toward both sides in the direction of the second axis R2 and extend in the -Z direction. The gimbal frame 14 includes an opening 143 that passes through the center of the gimbal frame main body 140 in the Z-axis direction.

7, each of the pair of first axis side extension portions 141 has a first axis side concave curved surface 144 that is recessed on the first axis R1 toward the movable body 10 in the first axis R1 direction. The first axis side extension portion 141 also has a pair of notches 145 cut out from both edges in the circumferential direction in the +Z direction of the first axis side concave curved surface 144. Furthermore, the first axis side extension portion 141 has a protruding portion 146 that protrudes toward the outer periphery in the -Z direction of the first axis side concave curved surface 144. Next, each of the pair of second axis side extension portions 142 has a second axis side concave curved surface 147 that is recessed on the second axis R2 toward the movable body 10 in the second axis R2 direction. Additionally, the second shaft side extension portion 142 has a pair of notches 148 cut out from both circumferential edges of the second shaft side concave curved surface 147 in the +Z direction.

7, the first thrust receiving member 153 has a plate portion 154 extending in the Z-axis direction, a foot portion 155 bent from the -Z direction end of the plate portion 154 towards the movable body 10, and a pair of arms 156 bent from both circumferential side edges of the plate portion 154 towards the movable body 10. A sphere 152 is fixed to the plate portion 154 by welding. The first thrust receiving member 153 also has a hole portion 157 penetrating the center of the corner where the plate portion 154 and the foot portion 155 are connected. The tips of the foot portion 155 and the pair of arms 156 are fixed to the rotation support mechanism 12 by welding. As described below, the rotation support mechanism 12 has a pair of second extension parts 64 that extend in the -Z direction on both sides of the first axis R1 direction of the movable body 10, and the tips of the feet 155 and a pair of arms 156 of the first gimbal frame support member 151 are fixed to the tips of the second extension parts 64 by welding.

When assembling the gimbal mechanism 13, the first axis side extension 141 of the gimbal frame 14 is bent inward and inserted into the inner periphery of the first gimbal frame receiving member 151. As a result, the first axis side extension 141 is biased toward the outer periphery, so that the first axis side concave curved surface 144 of each first axis side extension 141 and the sphere 152 of the first gimbal frame receiving member 151 can maintain a contact state. In addition, the notch 145 of the first axis side extension 141 is disposed between the pair of arms 156, and the protrusion 146 is disposed in the hole 157 (see FIG. 5). This prevents the gimbal frame 14 from slipping out of the first gimbal frame receiving member 151 in the +Z direction.

The second thrust receiving member 164 includes a plate portion 165 extending in the Z-axis direction, a foot portion 166 bent from the -Z end of the plate portion 165 toward the movable body 10, and a pair of arms 167 bent from both circumferential side edges of the plate portion 165 toward the movable body 10. A sphere 163 is fixed to the plate portion 165 by welding. In addition, the second thrust receiving member 164 includes foot bent portions 168 bent from both circumferential ends of the foot portion 166 in the +Z direction. When the second thrust receiving member 164 is fixed to the recess 161 of the case 3, the second thrust receiving member 164 is pressed into the recess 161 while the foot bent portions 168 are bent toward the center in the circumferential direction.

When assembling the gimbal mechanism 13, the second axis side extension 142 of the gimbal frame 14 is bent inward and inserted into the inner periphery of the second gimbal frame receiving member 162. This biases the second axis side extension 142 outward, so that the second axis side concave curved surface 147 of each second axis side extension 142 and the sphere 163 of the second gimbal frame receiving member 162 can maintain contact. In addition, the notch 145 of the second axis side extension 142 is disposed between the pair of arms 156. This prevents the gimbal frame 14 from slipping out of the second gimbal frame receiving member 162 in the +Z direction.

(Movable body)
Fig. 8 is a perspective view of the movable body 10 and the rotation support mechanism 12 as viewed from the subject side. Fig. 9 is an exploded perspective view of the movable body 10 and the rotation support mechanism 12. Fig. 10 is a perspective view of the movable body 10 and the rotation support mechanism 12 as viewed from the opposite subject side. As shown in Figs. 8 and 9, the movable body 10 includes a camera module 2, a frame-shaped holder 24 that holds the camera module 2, and a first member 25 fixed to the holder 24. The holder 24 is made of resin, and the first member 25 is made of metal.

As shown in Figures 8 and 9, the first member 25 includes a first annular plate portion 26 that surrounds the optical axis L and overlaps the outer periphery of the camera module 2 from the +Z direction, and a first extension portion 27 that protrudes from the first annular plate portion 26 toward the outer periphery and bends in the -Z direction on the outer periphery of the camera module 2 to connect to the holder 24. In this embodiment, the rotation support mechanism 12 is disposed in the gap between the first annular plate portion 26 and the camera module 2 in the Z-axis direction (optical axis L direction).

The first extension portion 27 is disposed at three locations in the -X, +Y, and -Y directions of the first annular plate portion 26. The angular position at which the first extension portion 27 is disposed is the angular position at which the first magnet 21M and the second magnet 22M of the shake correction magnetic drive mechanism 20 and the third magnet 23M of the rolling correction magnetic drive mechanism 23 are disposed. The first extension portion 27 includes a first extension portion first part 28 that extends from the first annular plate portion 26 toward the outer periphery and bends in the -Z direction, and a rectangular first extension portion second part 29 that is connected to the tip of the first extension portion first part 28 in the -Z direction and has a wider circumferential width than the first extension portion first part 28. The first extension portion second part 29 is fixed to the holder 24.

The first member 25 includes a ring-shaped first rail member 50 surrounding the optical axis L, and a first plate-shaped member 51 made of sheet metal to which the first rail member 50 is joined. The first plate-shaped member 51 is made of a magnetic metal. The first rail member 50 is made of a non-magnetic metal. The first rail member 50 may be made of a magnetic metal. The first rail member 50 is fitted into the inside of a circular first through hole 52 provided in the first plate-shaped member 51, and is fixed to the first plate-shaped member 51 by welding. More specifically, the first rail member 50 and the first plate-shaped member 51 are welded so that the opening edge of the first through hole 52 and the outer circumferential edge of the first rail member 50 are connected in the radial direction. The welding is performed at a plurality of points at equal angular intervals around the Z axis.

As shown in Figures 5 and 6, a first annular groove 53 is provided on the end face of the first rail member 50 in the -Z direction. In this embodiment, the first annular groove 53 is formed by cutting. Note that the first rail member 50 may be a member in which the first annular groove 53 is formed by a method other than cutting. For example, the first annular groove 53 may be formed by cold forging or pressing. The first annular plate portion 26 has an inner peripheral portion formed by the first rail member 50 and an outer peripheral portion formed by the first plate-shaped member 51. Thus, the first annular plate portion 26 has a first annular groove 53 that surrounds the optical axis L.

As shown in FIG. 9, the camera module 2 comprises a camera module main body 30A and a camera module cylindrical portion 30B that protrudes in the +Z direction from the center of the camera module main body 30A. The camera module cylindrical portion 30B houses a lens 2a (see FIG. 5 and FIG. 6). The holder 24 surrounds the camera module main body 30A from the outer periphery. The camera module cylindrical portion 30B protrudes in the +Z direction from a circular hole 26a provided in the center of the first annular plate portion 26, and is positioned in an opening 143 of the gimbal frame 14.

The camera module main body 30A and the holder 24 have an outline shape that is approximately octagonal when viewed from the +Z direction. The holder 24 has a first side wall 31 and a second side wall 32 that extend parallel to the Y direction, and a third side wall 33 and a fourth side wall 34 that extend parallel to the X direction. The first side wall 31 is located in the -X direction of the second side wall 32. The third side wall 33 is located in the -Y direction of the fourth side wall 34. A notch 32a is provided on the edge of the second side wall 32 in the -Z direction. As shown in FIG. 4, the flexible printed circuit board 6 connected to the image sensor 2b is pulled out from the end of the camera module 2 in the -Z direction to the +X direction of the movable body 10 through the notch 32a.

The holder 24 also has a fifth side wall 35 and a sixth side wall 36 located diagonally in the direction of the first axis R1, and a seventh side wall 37 and an eighth side wall 38 located diagonally in the direction of the second axis R2. The fifth side wall 35 is located in the -X direction of the sixth side wall 36. The seventh side wall 37 is located in the -X direction of the eighth side wall 38. A stopper protrusion 39 protruding in the +Z direction is formed on the end faces in the +Z direction of the fifth side wall 35, the sixth side wall 36, the seventh side wall 37, and the eighth side wall 38.

The first magnet 21M is fixed to the first side wall 31 of the holder 24, and the second magnet 22M is fixed to the third side wall 33. The first magnet 21M and the second magnet 22M are two-pole magnetized in the Z-axis direction. The magnetization polarization lines of the first magnet 21M and the second magnet 22M extend in the circumferential direction. The first magnet 21M and the second magnet 22M are arranged with the same pole facing the Z-axis direction. The third magnet 23M is fixed to the fourth side wall 34 of the holder 24. The third magnet 23M is pole-magnetized in the circumferential direction. The first magnet 21M, the second magnet 22M, and the third magnet 23M are arranged in the circumferential direction around the optical axis L. The third magnet 23M is arranged on the opposite side of the optical axis L to the second magnet 22M.

As shown in FIG. 9, the outer peripheral surfaces of the first side wall 31, the third side wall 33, and the fourth side wall 34 of the holder 24 are formed with recesses 40 recessed toward the inner peripheral side, and the first magnet 21M, the second magnet 22M, and the third magnet 23M are housed in the recesses 40. The first magnet 21M, the second magnet 22M, and the third magnet 23M are positioned in the Z-axis direction by abutting from the +Z direction against a bottom surface 41 provided at the -Z direction end of each recess 40.

The three recesses 40 each have a groove 42 formed on the inner surface on both sides in the circumferential direction. As shown in Figs. 3 and 8, the first extension second portion 29 provided at the tip of the first extension portion 27 in the -Z direction is inserted into each recess 40. The first extension second portion 29 has both circumferential ends inserted into the groove 42 and is fixed to each recess 40 by adhesive. The first extension second portion 29 is inserted radially inward of the first magnet 21M, the second magnet 22M, and the third magnet 23M. The first extension second portion 29 is made of a magnetic metal and therefore functions as a yoke for each magnet.

(Rotational support mechanism)
The rotation support mechanism 12 includes a first annular groove 53 provided in the movable body 10 coaxially with the optical axis L, and a second member 55 having a second annular groove 54 facing the first annular groove 53 in the Z-axis direction. The rotation support mechanism 12 also includes a plurality of rolling bodies 56 inserted into the first annular groove 53 and the second annular groove 54 to roll between the movable body 10 and the second member 55, and an annular retainer 57 that rotatably holds the rolling bodies 56. The retainer 57 includes a plurality of sphere holding holes 58 that rotatably hold each of the plurality of rolling bodies 56. The rotation support mechanism 12 also includes a pressure mechanism 59 that applies a force that brings the first annular groove 53 and the second annular groove 54 closer to each other in the Z-axis direction.

As shown in FIG. 9, the second member 55 comprises a ring-shaped second rail member 60 surrounding the optical axis L, and a second plate-shaped member 61 made of sheet metal to which the second rail member 60 is joined. The second rail member 60 is fitted into the inside of a circular second through hole 62 provided in the second plate-shaped member 61, and is fixed to the second plate-shaped member 61 by welding. More specifically, the second rail member 60 and the second plate-shaped member 61 are welded from the -Z direction at the opening edge of the second through hole 62 and the outer periphery of the second rail member 60. The welding is performed at multiple points at equal angular intervals around the Z axis.

The second annular groove 54 is provided on the end surface of the second rail member 60 in the +Z direction. In this embodiment, the second annular groove 54 is formed by cutting. The second rail member 60 and the second plate-shaped member 61 are both made of a non-magnetic metal. The second rail member 60 may be made of a magnetic metal. The second rail member 60 and the first rail member 50 are the same member. As shown in Figures 5 and 6, the second rail member 60 and the first rail member 50 are arranged coaxially, and the first annular groove 53 and the second annular groove 54 face each other in the Z-axis direction.

The rolling elements 56 are made of metal or ceramics. The retainer 57 is made of resin. The retainer 57 is located between the first rail member 50 and the second rail member 60 in the Z-axis direction. In this embodiment, the rolling elements 56 are spheres. The rotation support mechanism 12 includes six rolling elements 56, and the retainer 57 includes six sphere holding holes 58 arranged at equal angular intervals. The rolling elements 56 are held rotatably inside the sphere holding holes 58, and protrude from the retainer 57 in the -Z and +Z directions.

The second member 55 includes a second annular plate portion 63 surrounding the optical axis L, a pair of second extension portions 64 protruding from the second annular plate portion 63 on both sides in the direction of the first axis R1, and a pair of second protruding plate portions 65 protruding from the second annular plate portion 63 on both sides in the direction of the second axis R2. The second annular plate portion 63 has an inner peripheral portion formed by the second rail member 60 and an outer peripheral portion formed by the second plate-shaped member 61. As shown in Figures 5, 6, and 8, the second annular plate portion 63 and the retainer 57 are disposed in the gap in the direction of the optical axis L between the first annular plate portion 26 of the first member 25 and the camera module main body portion 30A.

Each of the pair of second extension parts 64 includes a second extension part first portion 66 extending from the second annular plate part 63 in the first axis R1 direction, and a second extension part second portion 67 extending in the Z-axis direction on the outer circumferential side of the movable body 10. As shown in FIG. 5, the second extension part second portion 67 faces the movable body 10 with a small gap therebetween, on the outer side of the first axis R1 direction of the movable body 10. As shown in FIG. 5 and FIG. 8, a first gimbal frame support member 151 is fixed to the surface of each second extension part second portion 67 on the opposite side to the movable body 10. The first gimbal frame support member 151 is fixed to the second extension part second portion 67 by welding the tips of the pair of arms 156 and the foot part 155 to the second extension part second portion 67.

8 and 9, the pressurizing mechanism 59 includes pressurizing magnets 68 arranged at four locations around the optical axis L of the second member 55, and first protruding plate portions 69 provided at four locations around the optical axis L of the first member 25. The pressurizing magnets 68 are fixed at four locations, namely, the pair of second extension first portions 66 and the pair of second protruding plate portions 65. Each pressurizing magnet 68 is bipolarly magnetized in the circumferential direction. The first protruding plate portions 69 protrude from the first annular plate portion 26 in four directions, namely, both sides in the first axis R1 direction and both sides in the second axis R2 direction. When the movable body 10 and the rotation support mechanism 12 are assembled, each of the four pressurizing magnets 68 arranged on the second member 55 overlaps with the four first protruding plate portions 69 provided on the movable body 10 in the optical axis L direction.

The first protruding plate portion 69 is made of a magnetic metal. Therefore, the magnetic attraction force of the pressurizing magnets 68 attracts the first protruding plate portion 69 that overlaps with each pressurizing magnet 68 in the optical axis L direction to the side of the pressurizing magnets 68. As a result, the pressurizing mechanism 59 applies a force that brings the first annular groove 53 and the second annular groove 54 closer to each other in the Z-axis direction at four points equiangularly spaced around the optical axis L. The movable body 10 is attracted to the second member 55 by the magnetic attraction force of the pressurizing mechanism 59, and is supported by the second member 55 in a state in which it can rotate around the Z-axis.

The pair of second extension portions 64 and the pair of second protruding plate portions 65 provided on the second member 55 face the stopper protrusion 39 provided on the holder 24 in the optical axis L direction. As shown in Figures 5 and 6, the +Z direction tip of the stopper protrusion 39 protrudes in the +Z direction beyond the +Z direction end face of the camera module main body 30A. Therefore, the movement range of the second member 55 in the -Z direction is restricted by the stopper protrusion 39.

8, the first side wall 31, the second side wall 32, the third side wall 33, and the fourth side wall 34 are lower in height in the Z-axis direction than the camera module main body 30A. As shown in FIG. 10, the holder 24 has a convex portion 43 that protrudes in the -Z direction from the end faces in the -Z direction of the first side wall 31, the third side wall 33, and the fourth side wall 34. The convex portion 43 is located at the center in the circumferential direction of the first side wall 31, the third side wall 33, and the fourth side wall 34. The convex portion 43 protrudes in the -Z direction from the bottom surface (surface facing the -Z direction) of the camera module main body 30A. Therefore, when the movable body 10 as a whole moves significantly in the Z-axis direction due to a drop impact or the like, the convex portion 43 hits the fixed body 11 before the camera module main body 30A.

The convex portion 43 is formed on three of the eight side walls arranged in the circumferential direction surrounding the camera module main body 30A (the first side wall 31, the third side wall 33, and the fourth side wall 34) that are located at an angular position midway between the first axis R1 direction and the second axis R2 direction. The convex portion 43 is also formed in the circumferential center of the first side wall 31, the third side wall 33, and the fourth side wall 34. Therefore, the convex portion 43 is formed at a position in the holder 24 that is the shortest distance from the optical axis L and has the smallest amount of movement in the Z-axis direction when the movable body 10 swings.

As shown in FIG. 10, the side surfaces 43a on both sides of the convex portion 43 in the circumferential direction are tapered surfaces that are inclined in the -Z direction toward the center in the circumferential direction. Therefore, the convex portion 43 has a shape that is large in circumferential width and high strength, but protrudes less in areas that move more in the Z-axis direction when the movable body 10 is swung. For this reason, there is no need to increase the gap between the movable body 10 and the fixed body 11 in the optical axis L direction to prevent the convex portion 43 from colliding with the fixed body 11 when the movable body 10 is swung.

10, the fifth side wall 35, the sixth side wall 36, the seventh side wall 37, and the eighth side wall 38 of the holder 24 have their end faces in the -Z direction located in the +Z direction from the bottom surface of the camera module main body 30A.
The ends of the diagonal portions in the direction of axis R2 in the -Z direction are recessed in the +Z direction. Since the diagonal portions in the direction of first axis R1 and the diagonal portions in the direction of second axis R2 of movable body 10 are the parts furthest from optical axis L, by cutting out these portions in the Z-axis direction, it is possible to reduce the moving space in the Z-axis direction of movable body 10 when movable body 10 swings about first axis R1 and second axis R2.

The rotation support mechanism 12 includes a rotation restriction mechanism 70 that restricts the range of rotation of the movable body 10 around the optical axis L. As shown in FIG. 8, the rotation restriction mechanism 70 includes a first rotation restriction portion 71 provided on the first member 25 and a second rotation restriction portion 72 provided on the second member 55. The first rotation restriction portion 71 protrudes from the first annular plate portion 26 toward the outer periphery and bends in the -Z direction. The tip of the first rotation restriction portion 71 in the -Z direction is fixed to the second side wall 32 of the holder 24.

The second rotation restricting portion 72 protrudes from the second annular plate portion 63 toward the outer periphery. A notch portion 73 having a larger circumferential width than the second rotation restricting portion 72 is provided in the circumferential center of the first rotation restricting portion 71, and the second rotation restricting portion 72 is disposed in the notch portion 73. Thus, the first rotation restricting portion 71 surrounds both circumferential sides of the second rotation restricting portion 72. The first rotation restricting portion 71 and the second rotation restricting portion 72 collide with each other, thereby restricting the range of rotation of the movable body 10 around the optical axis L relative to the second member 55.

(Main effects of this embodiment)
As described above, the optical unit 1 with shake correction function of this embodiment includes the movable body 10 including the camera module 2, the rotation support mechanism 12 that supports the movable body 10 rotatably around the optical axis L of the camera module 2, the gimbal mechanism 13 that supports the rotation support mechanism 12 rotatably around a first axis R1 that intersects with the optical axis L and supports the rotation support mechanism 12 rotatably around a second axis R2 that intersects with the optical axis L and the first axis R1, and the fixed body 11 that supports the movable body 10 via the gimbal mechanism 13 and the rotation support mechanism 12. The movable body 10 includes a resin holder 24 that surrounds the outer periphery of the camera module 2, and a metal first member 25 that is fixed to the holder 24. The first member 25 includes a first annular plate portion 26 that surrounds the optical axis L and overlaps with the camera module 2 when viewed from the optical axis L direction, and a first extension portion 27 that connects the first annular plate portion 26 and the holder 24. The rotation support mechanism 12 includes a second member 55 that includes a first annular groove 53 formed in the first annular plate portion 26, a second annular plate portion 63 that includes a second annular groove 54 that faces the first annular groove 53 in the optical axis L direction, and is supported by the gimbal mechanism 13 so as to be rotatable around the first axis R1, and a plurality of rolling bodies 56 that are inserted into the first annular groove 53 and the second annular groove 54 and roll between the first annular plate portion 26 and the second annular plate portion 63. The holder 24 is fixed with shake correction magnets (first magnet 21M, second magnet 22M) of the shake correction magnetic drive mechanism 20 that rotates the movable body 10 around the first axis R1 and the second axis R2. The first extension portion 27 is made of a magnetic metal and is fixed to the inner peripheral side of the shake correction magnets.

In this embodiment, the movable body 10 includes a resin holder 24 that surrounds the outer periphery of the camera module 2, and a first metal member 25 that is fixed to the holder 24. The first member 25 includes a first annular plate portion 26 that surrounds the optical axis L and overlaps with the camera module 2 when viewed from the optical axis L direction, and a first extension portion 27 that connects the first annular plate portion 26 and the holder 24 and is made of a magnetic metal and is fixed to the inner periphery of the shake correction magnet. Therefore, since the rail into which the rolling body 56 of the rotation support mechanism 12 is inserted and the yoke for the magnet of the shake correction magnetic drive mechanism 20 are integrated into the first member 25, the number of parts can be reduced, and the assembly of the movable body 10 and the rotation support mechanism 12 can be improved and costs can be reduced. In addition, by integrating the yoke into the first member 25, the positional accuracy of the yoke can be improved. Furthermore, by making the holder 24 out of resin, strength can be ensured without providing an end plate portion that protrudes inward at the end in the direction of the optical axis L, as is the case with a holder 24 made of sheet metal. Therefore, the height of the movable body 10 in the direction of the optical axis L can be reduced.

In this embodiment, the shake correction magnetic drive mechanism 20 includes a first shake correction magnetic drive mechanism 21 that rotates the movable body 10 around the first axis R1 and a second shake correction magnetic drive mechanism 22 that rotates the movable body 10 around the second axis R2. The shake correction magnet includes a first magnet 21M of the first shake correction magnetic drive mechanism 21 and a second magnet 22M of the second shake correction magnetic drive mechanism 22. A third magnet 23M of the rolling correction magnetic drive mechanism 23 that rotates the movable body 10 around the optical axis L is fixed to the holder 24, and the first magnet 21M, the second magnet 22M, and the third magnet 23M are arranged in the circumferential direction around the optical axis L, and the first extension portion 27 is fixed to each position on the inner periphery side of the first magnet 21M, the inner periphery side of the second magnet 22M, and the inner periphery side of the third magnet 23M. Therefore, since the yokes for the magnets of the shake correction magnetic drive mechanism 20 and the rolling correction magnetic drive mechanism 23 are all integrated into the first member 25, the number of parts can be reduced, improving the assembly of the movable body 10 and the rotation support mechanism 12 and reducing costs. In addition, the positional accuracy of the yoke can be improved.

In this embodiment, the second member 55 includes a pair of second extensions 64 protruding from the second annular plate portion 63 on both sides in the first axis R1 direction, and a pair of second protruding plate portions 65 protruding from the second annular plate portion 63 on both sides in the second axis R2 direction, and the pair of second extensions 64 are connected to the gimbal mechanism 13. The second annular plate portion 63 is disposed in the gap in the optical axis L direction between the first annular plate portion 26 and the camera module 2. Stopper protrusions that face the second member 55 in the optical axis L direction are provided at diagonal positions in the first axis R1 direction and diagonal positions in the second axis R2 direction of the holder 24. In this configuration, the first annular plate portion 26 functions as a stopper member that prevents the second annular plate portion 63 from coming off. Therefore, since there is no need to separately arrange a stopper member that overlaps with the second annular plate portion 63 in the optical axis L direction, the height of the rotation support mechanism 12 in the optical axis L direction can be reduced. This allows the height of the optical unit 1 with shake correction function in the direction of the optical axis L to be reduced. In addition, the stopper protrusions can prevent the second annular plate portion 63 provided on the second member 55 from moving away from the first annular plate portion 26. Furthermore, because the holder 24 is made of resin, it is easier to form a complex uneven shape than if it were made of sheet metal. Therefore, it is easy to manufacture the holder 24 with the stopper protrusions.

In this embodiment, the first annular plate portion 26 and the second annular plate portion 63 overlap with the camera module 2 from the +Z direction (i.e., one side of the optical axis L direction). The diagonal portion of the holder 24 in the first axis R1 direction and the diagonal portion of the holder 24 in the second axis R2 direction have ends in the -Z direction (i.e., the other side of the optical axis L direction) recessed in the +Z direction more than the camera module 2. This makes it possible to reduce the height in the optical axis L direction of the space in which the movable body 10 moves when the movable body 10 oscillates around the first axis R1 and the second axis R2, thereby making it possible to reduce the product height in the optical axis L direction of the optical unit 1 with shake correction function. In addition, since the holder 24 is made of resin, it is easier to form a complex uneven shape than a sheet metal. Therefore, it is easy to manufacture a holder 24 with a shape in which the diagonal portion in the first axis R1 direction and the diagonal portion in the second axis R2 direction are recessed.

The holder 24 of this embodiment has a plurality of side walls (first side wall 31 to eighth side wall 38) arranged in the circumferential direction surrounding the camera module 2. Of the plurality of side walls, three of the four side walls (first side wall 31, third side wall 33, and fourth side wall 34) arranged at an angular position intermediate between the first axis R1 direction and the second axis R2 direction are provided with a convex portion 43 that protrudes toward the other side of the optical axis L direction from the camera module 2. In this way, when the movable body 10 collides with the fixed body 11 due to a drop impact, the impact is applied to the convex portion 43, so that it is possible to prevent the camera module 2 from being directly impacted. Note that the holder may have a shape in which the convex portion 43 is provided at at least one angular position intermediate between the first axis R1 direction and the second axis R2 direction.

In this embodiment, the convex portion 43 is disposed at the center in the circumferential direction of each side wall, and is disposed at a position in the holder 24 where the distance from the optical axis L is the smallest, in other words, at a position where the amount of movement in the optical axis L direction when the movable body 10 is swung is the smallest. Therefore, the gap in the optical axis L direction between the movable body 10 and the fixed body 11, which is necessary to prevent the convex portion 43 from colliding with the fixed body 11 when the movable body 10 is swung, is small. Therefore, it is possible to avoid an increase in the product height in the optical axis L direction of the optical unit with shake correction function due to the provision of the convex portion 43.

In this embodiment, the side surfaces 43a on both sides of the circumferential direction of the convex portion 43 are tapered surfaces that incline toward the other side in the optical axis L direction as they approach the center of the circumferential direction of the convex portion 43. Therefore, the convex portion 43 has a shape in which the circumferential width of the base end portion connected to the side wall is large, and therefore has high strength. In addition, the shape in which the side surfaces 43a on both sides of the circumferential direction are tapered is such that the amount of protrusion is smaller in the portion where the amount of movement in the optical axis L direction is larger when the movable body 10 is swung. Therefore, the gap in the optical axis L direction between the movable body 10 and the fixed body 11, which is necessary to prevent the convex portion 43 from colliding with the fixed body 11 when the movable body 10 is swung, is small. Therefore, it is possible to avoid the product height in the optical axis L direction of the optical unit with shake correction function from increasing due to the provision of the convex portion 43.

In this embodiment, the rotation support mechanism 12 includes a pressurizing mechanism 59 that applies a force that brings the first annular groove 53 and the second annular groove 54 closer together in the direction of the optical axis L. The pressurizing mechanism 59 includes a first protruding plate portion 69 that protrudes outward from the first annular plate portion 26, and a pressurizing magnet 68 that is fixed to a circumferential portion of the second member 55 around the optical axis L. The first protruding plate portion 69 is made of a magnetic metal and is attracted to the pressurizing magnet 68. With this configuration, the components of the pressurizing mechanism 59 can be integrated into the first member 25, reducing the number of components and improving assembly. In addition, by mounting a pressurizing magnet 68 on the second member 55 that rotates relative to the movable body 10 and providing the first protruding plate portion 69 on the movable body 10 that is attracted to the pressurizing magnet 68, it is possible to prevent the rotational position of the first protruding plate portion 69 from being shifted due to being attracted to the magnets of the shake correction magnetic drive mechanism 20 and the rolling correction magnetic drive mechanism 23 mounted on the movable body 10. Therefore, it is possible to prevent the pressurizing mechanism 59 from being interfered with by the shake correction magnetic drive mechanism 20 and the rolling correction magnetic drive mechanism 23. In addition, the angular position of the movable body 10 around the optical axis L can be determined by the pressurizing mechanism 59.

In this embodiment, a rotation restriction mechanism 70 is provided that restricts the rotation range of the movable body 10 around the optical axis L. The rotation restriction mechanism 70 includes a first rotation restriction portion 71 formed on the first member 25 and a second rotation restriction portion 72 formed on the second member 55. The first rotation restriction portion 71 surrounds both circumferential sides of the second rotation restriction portion 72. With this configuration, the rotation restriction mechanism 70 can be completed between the first member 25 and the second member 55, and the rotation restriction mechanism 70 can be configured without a stopper member that overlaps with the first member 25 and the second member 55 in the optical axis L direction. Therefore, the height of the rotation support mechanism 12 in the optical axis L direction can be reduced. In addition, since the rotation restriction mechanism 70 can be configured with a small number of parts, the deterioration of the dimensional accuracy of the rotation restriction mechanism 70 due to the accumulation of part tolerances can be suppressed. Therefore, the rotation range of the movable body 10 can be precisely restricted.

In this embodiment, the first rotation restricting portion 71 extends from the first annular plate portion 26 toward the outer periphery and is fixed to the holder 24, and the second rotation restricting portion 72 is disposed in a notch formed by cutting out the circumferential center portion of the first rotation restricting portion 71. This allows the connection portion connecting the first annular plate portion 26 and the holder 24 to be used as the first rotation restricting portion 71, thereby simplifying the shape of the first member 25.

(Modification)
(1) In the above embodiment, the first rotation restricting portion 71 surrounds both circumferential sides of the second rotation restricting portion 72, but a configuration in which the second rotation restricting portion 72 surrounds both circumferential sides of the first rotation restricting portion 71 may be adopted. For example, a notch portion 73 is formed in the circumferential center of the second rotation restricting portion 72, and the first rotation restricting portion 71 is disposed in the notch portion 73. In other words, the rotation restricting mechanism 70 may be configured such that one of the first rotation restricting portion 71 and the second rotation restricting portion 72 surrounds both circumferential sides of the other of the first rotation restricting portion 71 and the second rotation restricting portion 72.

(2) In the above embodiment, the first rotation restricting portion 71 is provided on the first member 25, but the first rotation restricting portion 71 may be provided on the holder 24. For example, a convex portion protruding in the +Z direction may be formed on the end face of the holder 24 in the +Z direction, and the convex portion may be caused to collide with the second rotation restricting portion 72 in the circumferential direction to restrict the rotation of the movable body 10. In other words, the rotation restricting mechanism 70 may be configured to include the first rotation restricting portion 71 formed on the first member 25 or the holder 24, and the second rotation restricting portion 72 extending from the second annular plate portion 63 toward the outer periphery.

(3) In the above embodiment, the pressure mechanisms 59 are provided at four locations around the optical axis L, but it is sufficient if they are provided at two locations on opposite sides of the optical axis L.

Other Embodiments
(A) In the above embodiment, the first annular plate portion 26 is a separate part (first rail member 50) from the first plate-shaped member 51, where the first annular groove 53 is formed. However, the first rail member 50 and the first plate-shaped member 51 may be integrated. That is, the first member 25 may be a single part including a first rail portion provided with the first annular groove 53 and a first plate-shaped portion extending from the first rail portion to the outer periphery. Similarly, the second member 55 may be a single part including a second rail portion provided with the second annular groove 54 and a second plate-shaped portion extending from the second rail portion to the outer periphery. In this case, the first annular groove 53 and the second annular groove 54 can be formed by a processing method such as cold forging, pressing, or cutting.

(b) In the above embodiment, the rotation support mechanism 12 is configured to place the second annular plate portion 63 of the second member 55 in the gap in the optical axis L direction between the first annular plate portion 26 of the first member 25 constituting the movable body 10 and the camera module 2. However, a configuration in which the arrangement of the first annular plate portion 26 and the second annular plate portion 63 in the optical axis L direction is reversed may also be adopted.

Reference Signs List 1...Optical unit with shake correction function, 2...Camera module, 2a...Lens, 2b...Imaging element, 3...Case, 4...Cover, 4a...Opening, 5...Base, 6...Flexible printed circuit board, 7...Flexible printed circuit board, 8...Hook, 9...Protrusion, 10...Movable body, 11...Fixed body, 12...Rotational support mechanism, 13...Gimbal mechanism, 14...Gimbal frame, 15...First connection mechanism, 16...Second connection mechanism, 17...Magnetic plate, 18...Frame, 19...Wiring accommodating section, 20...Magnetic driver for shake correction structure, 21...first shake correction magnetic drive mechanism, 21C...first coil, 21M...first magnet, 22...second shake correction magnetic drive mechanism, 22C...second coil, 22M...second magnet, 23...rolling correction magnetic drive mechanism, 23C...third coil, 23M...third magnet, 24...holder, 25...first member, 26...first annular plate portion, 26a...circular hole, 27...first extension portion, 28...first extension portion first part, 29...first extension portion second part, 30A...camera module main body portion, 30B...camera module cylindrical portion , 31...first side wall, 32...second side wall, 32a...notch portion, 33...third side wall, 34...fourth side wall, 35...fifth side wall, 36...sixth side wall, 37...seventh side wall, 38...eighth side wall, 39...stopper protrusion, 40...recess, 41...bottom surface, 42...groove portion, 43...protrusion, 43a...side surface, 50...first rail member, 51...first plate-shaped member, 52...first through hole, 53...first annular groove, 54...second annular groove, 55...second member, 56...rolling body, 57...retainer, 58...sphere holding hole, 59...pressurizing mechanism, 60...second rail member a second plate-shaped member, 61... second plate-shaped member, 62... second through hole, 63... second annular plate portion, 64... second extension portion, 65... second protruding plate portion, 66... second extension portion first part, 67... second extension portion second part, 68... pressurizing magnet, 69... first protruding plate portion, 70... rotation restricting mechanism, 71... first rotation restricting portion, 72... second rotation restricting portion, 73... notch portion, 140... gimbal frame main body portion, 141... first axis side extension portion, 142... second axis side extension portion, 143... opening portion, 144... first axis side concave curved surface, 145... notch, 146...
Protrusion, 147... second shaft side concave curved surface, 148... notch, 151... first gimbal frame receiving member, 152... sphere, 153... first thrust receiving member, 154... plate portion, 155... foot portion, 156... arm portion, 157... hole portion, 161... recess, 162... second gimbal frame receiving member, 163... sphere, 164... second thrust receiving member, 165... plate portion, 166... foot portion, 167... arm portion, 168...foot bent portion, 181a...second coil fixing hole, 181...first side plate portion, 182...second side plate portion, 183a...first coil fixing hole, 183...third side plate portion, 184a...third coil fixing hole, 184...fourth side plate portion, 185...notch portion, 191...fifth side plate portion, 192...sixth side plate portion, 193...seventh side plate portion, 194...notch portion, L...optical axis, R1...first axis, R2...second axis

Claims (10)

a movable body having a camera module; a rotational support mechanism that supports the movable body rotatably around an optical axis of the camera module; a gimbal mechanism that supports the rotational support mechanism rotatably around a first axis that intersects with the optical axis and supports the rotational support mechanism rotatably around a second axis that intersects with the optical axis and the first axis; and a fixed body that supports the movable body via the gimbal mechanism and the rotational support mechanism,
the movable body includes a resin holder surrounding an outer periphery of the camera module, and a metal first member fixed to the holder;
the first member includes a first annular plate portion surrounding the optical axis and overlapping with the camera module as viewed from the optical axis direction, and a first extension portion connecting the first annular plate portion and the holder,
The rotation support mechanism includes:
A first annular groove formed in the first annular plate portion;
a second member including a second annular plate portion having a second annular groove formed therein and facing the first annular groove in the optical axis direction, the second member being supported by the gimbal mechanism so as to be rotatable around the first axis;
a plurality of rolling elements inserted into the first annular groove and the second annular groove and rolling between the first annular plate portion and the second annular plate portion,
a shake correction magnet of a shake correction magnetic drive mechanism that rotates the movable body about the first axis and the second axis is fixed to the holder;
The optical unit with shake correction function, wherein the first extension portion is made of a magnetic metal and is fixed to an inner periphery side of the shake correction magnet. the shake correction magnetic drive mechanism includes a first shake correction magnetic drive mechanism that rotates the movable body about the first axis and a second shake correction magnetic drive mechanism that rotates the movable body about the second axis,
the shake correction magnet includes a first magnet of the first shake correction magnetic drive mechanism and a second magnet of the second shake correction magnetic drive mechanism,
a third magnet of a rolling correction magnetic drive mechanism that rotates the movable body about the optical axis is fixed to the holder;
the first magnet, the second magnet, and the third magnet are arranged in a circumferential direction around the optical axis,
The optical unit with shake correction function according to claim 1, characterized in that the first extension portion is fixed at each of the positions on the inner periphery side of the first magnet, the inner periphery side of the second magnet, and the inner periphery side of the third magnet. the second member includes a pair of second extending portions protruding from the second annular plate portion to both sides in the first axial direction, and a pair of second protruding plate portions protruding from the second annular plate portion to both sides in the second axial direction, the pair of second extending portions being connected to the gimbal mechanism,
the second annular plate portion is disposed in a gap between the first annular plate portion and the camera module in the optical axis direction,
The optical unit with shake correction function described in claim 1 or 2, characterized in that a stopper convex portion that faces the second member in the optical axis direction is provided at a diagonal position in the first axial direction and a diagonal position in the second axial direction of the holder. the first annular plate portion and the second annular plate portion overlap with the camera module from one side in the optical axis direction,
An optical unit with shake correction function as described in any one of claims 1 to 3, characterized in that the diagonal portion of the holder in the first axial direction and the diagonal portion of the holder in the second axial direction have their other ends recessed toward one side of the optical axis direction relative to the camera module. the first annular plate portion and the second annular plate portion overlap with the camera module from one side in the optical axis direction,
the holder includes a plurality of side walls arranged in a circumferential direction around the camera module;
An optical unit with shake correction function as described in any one of claims 1 to 4, characterized in that at least one of the side walls among the multiple side walls that is arranged at an angular position intermediate between the first axis direction and the second axis direction is provided with a convex portion that protrudes toward the other side in the optical axis direction beyond the camera module. The optical unit with shake correction function described in claim 5, characterized in that the convex portion is disposed at the center of the circumference of the side wall. The optical unit with shake correction function described in claim 6, characterized in that the side surfaces on both sides of the circumferential direction of the convex portion are tapered surfaces that incline toward the other side in the optical axis direction as they approach the center of the circumferential direction of the convex portion. the rotation support mechanism includes a pressure applying mechanism that applies a force to bring the first annular groove and the second annular groove closer to each other in the optical axis direction,
the pressurizing mechanism includes a first protruding plate portion protruding from the first annular plate portion toward an outer circumferential side, and a pressurizing magnet fixed to a portion of the second member in a circumferential direction around the optical axis,
8. The optical unit with shake correction function according to claim 1, wherein the first protruding plate portion is made of a magnetic metal and is attracted to the pressure applying magnet. a rotation restriction mechanism that restricts a rotation range of the movable body about the optical axis,
The rotation restriction mechanism includes:
a first rotation restricting portion formed on the first member or the holder;
a second rotation restricting portion formed on the second member,
9. An optical unit with shake correction function as described in any one of claims 1 to 8, characterized in that one of the first rotation regulating portion and the second rotation regulating portion surrounds both circumferential sides of the other of the first rotation regulating portion and the second rotation regulating portion. the first rotation restricting portion extends from the first annular plate portion toward an outer periphery and is fixed to the holder,
10. The optical unit with shake correction function according to claim 9, wherein the second rotation restricting portion is disposed in a cutout portion obtained by cutting out a central portion in a circumferential direction of the first rotation restricting portion.

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