JP6809738B2 - Lens drive device, camera device and electronic equipment - Google Patents

Description

The present invention relates to a lens driving device, a camera device and an electronic device.

Electronic devices such as mobile phones and smartphones are equipped with small cameras. Some small cameras of this type are of the autofocus type. The autofocus type small camera is provided with a lens driving device that drives the lens barrel.

Patent Document 1 discloses a lens driving device in which a lens barrel is fixed inside a lens carrier and the focus is adjusted by moving the lens carrier in the optical axis direction of the lens barrel.

JP-A-2010-134409

In the above conventional example, an opening that opens in the optical axis direction of the lens barrel is formed in the main body, the lens barrel is inserted in the optical axis direction through the opening, and the lens barrel is fixed to the lens carrier. It has become. The lens barrel is slid onto the lens carrier and inserted without forming a thread between the lens barrel and the lens carrier. Therefore, in Patent Document 1, it is not necessary to form threads on both the lens barrel and the lens carrier, and it is stated that the lens driving device can be miniaturized accordingly.

However, since the lens barrel is inserted by sliding it from the optical axis direction to the lens carrier, a wall surface for sliding the lens barrel is required all around the lens carrier, and the lens carrier cannot be made smaller, so that the lens is driven. It was an obstacle to the miniaturization of the device.

An object of the present invention is to provide a lens driving device, a camera device, and an electronic device that can solve the above-mentioned conventional problems and can be miniaturized.

One aspect of the present invention is a lens driving device, which includes a box-shaped lens carrier for internally fixing a lens barrel for guiding light from a subject to a light receiving sensor, and the lens carrier. Has a first opening for incident light from the subject, a second opening for emitting light to the light receiving sensor, and a third opening for mounting the lens barrel. The third opening is formed at the end of the two opposite side walls of the box shape on the side other than the side where the first opening and the second opening are provided, and the third opening is formed. This is a lens driving device in which the inner surfaces of the two side walls are formed in parallel from the opening of No. 3 to the center of the lens carrier.

Preferably, the lens carrier has a fourth opening at the end of the two side walls opposite to the third opening.

Preferably, the distance between the two side walls in the fourth opening is narrower than the distance between the two side walls in the third opening.

Preferably, an optical member provided between the subject and the first opening to receive light from the front side and guide the light to the first opening is further provided, and the third opening is the lens carrier. It is provided on the front side of.

Preferably, the lens driving device housing on which the lens carrier is supported is further provided, and the lens barrel is mounted on the third opening with the lens carrier supported by the lens driving device housing. Make it possible.

Preferably, the lens driving device housing surrounds the lens carrier, and the third opening directly faces the lens driving device housing.

Preferably, the lens driving device housing has a lid that closes the front surface thereof, and the lid directly faces the third opening. Further, the lens carrier is driven in the optical axis direction of the lens barrel.

Another aspect of the present invention is a camera device including the lens driving device and a light receiving sensor that receives light that has passed through the lens barrel.

Yet another aspect of the present invention is an electronic device equipped with the camera device.

According to the present invention, since the lens carrier is provided with a third opening that allows the lens barrel to be inserted from the direction intersecting the optical axis direction of the lens barrel, the size of the lens carrier can be reduced and the lens can be inserted. The drive device, camera device, and electronic device can be miniaturized.

It is an exploded perspective view which shows the lens driving device which concerns on embodiment of this invention. It is a perspective view which shows the lens driving device which concerns on embodiment of this invention. It is a perspective view which shows the lens driving device which concerns on embodiment of this invention, and removed the lid body from FIG. The lens driving device which concerns on embodiment of this invention is shown, and is the cross-sectional perspective view cut by the plane in the left-right direction including the optical axis direction of a lens barrel. The lens driving device which concerns on embodiment of this invention is shown, and is the cross-sectional perspective view cut by the plane in the front-rear direction including the optical axis direction of a lens barrel. It is a perspective view which shows the lens carrier used for the lens driving device which concerns on embodiment of this invention. It is a perspective view which shows the vicinity of the upper leaf spring in the lens driving device which concerns on embodiment of this invention. In the lens driving device according to the embodiment of the present invention, the vicinity of the lower leaf spring is shown, and is a perspective view seen from below.

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an exploded perspective view showing a lens driving device 10 according to an embodiment of the present invention.
The lens driving device 10 includes an upper member 12, a lid 14, a lower member 16, a yoke 18, a reinforcing member 20, a lens carrier main body 22, a magnet 24, a coil 26, an upper leaf spring 28, a lower leaf spring 30, and a terminal 32. Have.

In this specification, as shown in FIG. 1, one of the lens barrels 40 described later in the optical axis direction is up, the other is down, and one of the directions orthogonal to the optical axis direction of the lens barrel 40 is used. The front and the other are referred to as the rear, and one in the direction orthogonal to both the vertical and front-back directions is referred to as the left, and the other is referred to as the right.

The upper member 12 is formed with an upper surface portion 12a and side surface portions 12b extending downward to the left and right of the upper surface portion 12a and later. Further, inside the left and right side surface portions 12b, slope portions 12c for positioning the prism 36, which will be described later, are formed.

The lid 14 is formed with an incident hole 14a into which light is incident. Further, the lower member 16 is formed in a square shape, and an exit hole 16a for emitting light is formed inside. Further, an IR filter and an optical sensor are attached to the lower member 16 when assembling the camera device described later.

The yoke 18 is formed in a U-shape (U-shape), is composed of a left surface portion 18a, a right surface portion 18b, and a rear surface portion 18c, and is surrounded by three surfaces except the front surface portion. As for the front, the tips of the left surface portion 18a and the right surface portion 18b are bent so as to face each other.

The lens driving device housing 34 is composed of the upper member 12, the lid 14, the lower member 16, and the yoke 18. That is, the left surface portion 18a, the right surface portion 18b, and the rear surface portion 18c of the yoke 18 are fitted on the outer surface of the side surface portion 12b of the upper member 12, and the left surface portion 18a, the right surface portion 18b, and the rear surface portion 18c of the yoke 18 are fitted on the lower member 16. The lid 14 is fitted into the upper member 12, the lower member 16 and the yoke 18 so as to fit the inner surface and further close the front surface of the yoke 18, and the lens driving device housing 34 is configured. The lens drive device housing 34 is square and has a hollow inside.

As shown in FIGS. 2 to 5, the prism 36 is fixed to the inside of the upper member 12. The prism 36 constitutes an optical member that forms an optical system of a bent optical axis, and has a triangular cross section. The front surface of the prism 36 is fitted into the incident hole 14a of the lid 14, the left and right sides of the rear slope are in contact with the slope portion 12c of the upper member 12, and the lower surface is arranged so as to face downward. The prism 36 receives light from the front side, reflects it on a slope, and guides it downward.

As best shown in FIG. 6, the reinforcing member 20 and the lens carrier main body 22 are coupled to form the lens carrier 38. The lens carrier main body 22 is made of, for example, a resin, and has a square frame-shaped lower surface portion 22a and a coil mounting portion 22b extending upward from the left and right sides of the lower surface portion 22a. The reinforcing member 20 is made of a metal such as stainless steel and is formed in a square frame shape. The left and right sides of the reinforcing member 20 are fixed to the upper end of the coil mounting portion 22b of the lens carrier main body 22 from the inside to reinforce the lens carrier main body 22.

As shown in FIGS. 3 and 5, the lens carrier 38 is provided with an opening 38a into which the lens barrel 40 can be inserted. The opening 38a is surrounded by a reinforcing member 20, a lower surface portion 22a of the lens carrier main body portion 22, and a coil mounting portion 22b. The opening 38a is opened toward the front side. At the time of assembly, as shown in FIG. 3, the lens barrel 40 is inserted into the lens carrier 38 from the front through the opening 38a before the lid 14 is attached.

Further, a lens barrel contact surface 22c is formed on the rear inner surface of the coil mounting portion 22b of the lens carrier main body portion 22. The lens barrel 40 includes a lens and has a columnar shape. It abuts on the inner surface of the coil mounting portion 22b and the lens barrel contact surface 22c, and is fixed to the lens carrier 38 via an adhesive or the like.

As best shown in FIG. 4, the magnet 24 is composed of four rectangular fragments 24a, 24b, 24c, 24d. The two fragments 24a and 24b are arranged vertically and fixed to the inner surface of the left surface portion 18a of the yoke 18. Further, the other two fragments 24c and 24d are arranged in the vertical direction and fixed to the inner surface of the right surface portion 18b of the yoke 18 by aligning the fragments 24a and 24b in the vertical direction. Each fragment 24a, 24b, 24c, 24d is magnetized so that the surface facing inward and the surface facing outward have different magnetic poles. Further, the magnetic poles of the inward-facing surfaces of the fragments 24a, 24b, 24c, and 24d are different between adjacent and opposite pieces. For example, assuming that the surface of the fragment 24a facing inward is the north pole, the surface of the fragment 24b and the fragment 24c facing inward is the south pole, and the surface of the fragment 24d facing inward is the north pole. Further, the fragment 24a and the fragment 24b and the fragment 24c and the fragment 24d may be integrally formed. At that time, the magnet is magnetized so that the magnetic poles of the surface facing the inside of the portion corresponding to the fragment 24a (24c) and the portion corresponding to the fragment 24b (24d) are different.

Further, as shown in FIG. 6, the coil mounting portion 22b of the lens carrier main body portion 22 is formed so that two positioning protrusions 22d project outward in the front-rear direction.

The coil 26 has a shape in which both sides of a straight line portion are connected by a semicircular portion. The air core portion of the coil 26 is positioned by fitting it into the positioning protrusion 22d, and is fixed to the lens carrier 38 via an adhesive or the like. The straight portion of the coil 26 faces the fragments 24a to 24d of the magnet 24. Therefore, a current flows in the front-rear direction through the straight portion of the coil 26, and a magnetic flux passes in the left-right direction of the coil 26, so that an electromagnetic force in the vertical direction is applied to the lens carrier 38.

A pair of upper leaf springs 28 are provided on the left and right sides, and as shown in FIG. 7, they are composed of a device main body side fixing portion 28a, a lens carrier side fixing portion 28b, and two spring portions 28c, respectively. The device main body side fixing portion 28a is fixed to, for example, the upper end of the magnet 24. Further, the lens carrier side fixing portion 28b is fixed to the upper end of the coil mounting portion 22b of the lens carrier main body portion 22. The spring portion 28c has a wire shape and is bent twice, for example, to elastically connect the device main body side fixing portion 28a and the lens carrier side fixing portion 28b. The upper leaf spring 28 has four spring portions 28c, and supports the periphery of the lens carrier 38 at four locations. The upper leaf springs 28 are located on the left and right sides of the lens carrier 38, and the plate surfaces are attached in a direction orthogonal to the optical axis, and the lens carrier 38 is attached to the lens drive device housing 34 with respect to the optical axis of the lens barrel 40. It is supported so that it can move in the direction.

A pair of lower leaf springs 30 are provided on the left and right, and each is divided into two in the front and rear. As shown in FIG. 8, the lower leaf spring 30 is composed of a device main body side fixing portion 30a, a lens carrier side fixing portion 30b, and a spring portion 30c. The device main body side fixing portion 30a is fixed to the upper end of the lower member 16. Further, the lens carrier side fixing portion 30b is fixed to, for example, the lower surface portion 22a of the lens carrier main body portion 22. The spring portion 30c has a wire shape and is bent twice, for example, to elastically connect the device main body side fixing portion 30a and the lens carrier side fixing portion 30b. The lower leaf spring 30 has four spring portions 30c, and supports the periphery of the lens carrier 38 at four locations. The lower leaf springs 30 are located on both the front, rear, left and right sides of the lens carrier 38, and the plate surfaces are attached in the direction orthogonal to the optical axis, and the lens carrier 38 is attached to the lens drive device housing 34 with respect to the lens barrel. It is supported so as to be movable in the optical axis direction of 40.

The lower leaf spring 30 is also used as a conductive member. As shown in FIG. 8, the end portion 26a of the coil 26 described above is connected to the lens carrier side fixing portion 30b of the lower leaf spring 30 which is separated from each other.

The two terminals 32 are connected to the device main body side fixing portion 30a of the lower leaf spring 30, and are fixed to the lower member 16 together with the device main body side fixing portion 30a. The terminal 32 is separated from the center of the lens barrel 40, for example, to the right side, is on the side surface of the lower member 16, and extends downward. The current entering from one terminal 32 flows to the two coils 26 via one lower leaf spring 30, and exits from the other terminal 32 via the other lower leaf spring 30. The coil 26 is connected in parallel to the terminal 32.

A light receiving sensor that receives light that has passed through the lens barrel 40 via an IR filter is provided on the lower side of the lower member 16 to form a camera device.

In the camera device, the light entering the prism 36 from the subject is bent by the prism 36 by 90 degrees, collected by the lens barrel 40, and detected by the light receiving sensor. The amount of movement of the lens barrel 40 for focusing the subject is calculated by a controller provided in the camera. This controller controls so that a voltage corresponding to the amount of movement of the lens is applied to the terminal 32. When a current flows through the coil 26 via the terminal 32 and the lower leaf spring 30, the magnetic flux from the magnet 24 acts on the coil 26, and an electromagnetic force that tends to move in the vertical direction is generated in the coil 26. When an electromagnetic force is generated in the coil 26, the lens carrier 38 moves with the lens barrel 40 against the upper leaf spring 28 and the lower leaf spring 30, and is focused.

Since there is no special member in the front direction of the lens barrel 40 as in the above embodiment, it is convenient as a direction for inserting the lens barrel 40 into the lens carrier 38, but the present invention is limited to this. It's not a thing. For example, the opening 38a of the lens carrier 38 may be formed so that the lens barrel 40 is inserted from the left-right direction or the rear direction. Further, the present invention is not limited to the configuration in which the lens barrel 40 is inserted from a direction orthogonal to the optical axis direction, and may be a direction intersecting the optical axis direction of the lens barrel 40, for example, with respect to the optical axis direction. The lens barrel 40 may be inserted at an angle.

10 Lens drive device 12 Upper member 14 Lid body 16 Lower member 18 York 20 Reinforcing member 22 Lens carrier body 24 Magnet 26 Coil 28 Upper leaf spring 30 Lower leaf spring 32 Terminal 34 Lens drive housing 36 Prism 38 Lens carrier 38a Opening Part 40 Lens barrel

Claims (9)

It is a box-shaped lens carrier for fixing the lens barrel for guiding the light from the subject to the light receiving sensor inside, and includes a lens carrier driven in the optical axis direction of the lens barrel .
The lens carrier includes a first opening for incident light from the subject, a second opening for emitting light to the light receiving sensor, and a third opening for mounting the lens barrel. Have,
The third opening is formed at the ends of the two opposite side walls of the box shape on the side other than the side where the first opening and the second opening are provided.
A lens driving device in which the inner surfaces of the two side walls are formed in parallel from the third opening to the center of the lens carrier. The lens driving device according to claim 1, wherein the lens carrier has a fourth opening at an end portion of the two side walls opposite to the third opening. The lens driving device according to claim 2, wherein the distance between the two side walls in the fourth opening is narrower than the distance between the two side walls in the third opening. An optical member provided between the subject and the first opening, which receives light from the front side and guides the light to the first opening, is further provided.
The lens driving device according to claim 1, wherein the third opening is provided on the front side of the lens carrier. A lens driving device housing on which the lens carrier is supported is further provided, and the lens driving device housing has a lid that closes the front surface of the lens driving device housing.
The first aspect of the present invention, wherein the third opening allows the lens barrel to be mounted in a state where the lens carrier is supported by the lens driving device housing before the lid is attached. Lens drive device. The lens driving device housing surrounds the lens carrier.
The lens driving device according to claim 5 , wherein in the state after the lid is attached, the third opening directly faces the lens driving device housing. Wherein In the state after attaching the lid, the lens driving device housing, said lid lens driving device facing to have claim 6 directly to the third opening. A camera device including the lens driving device according to any one of claims 1 to 7, the lens barrel, and a light receiving sensor that receives light that has passed through the lens barrel. An electronic device including the camera device according to claim 8.

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