JP2020177248A - Lens driving device, camera device, and electronic apparatus - Google Patents

Abstract

To provide a lens driving device, a camera device, and an electronic apparatus which can be miniaturized.SOLUTION: A lens driving device 10 includes: a lens carrier 26 having a lens barrel fixing part 26a for fixing a lens barrel 28; a prism 24 provided on the upper side of the lens carrier 26 and fixed to a base 20; and a magnet 34 and a coil 38 for moving the lens carrier 26 in an optical axis direction of the lens barrel 28. The magnet 34 and the coil 38 are arranged behind the prism 24 which receives light from the front.SELECTED DRAWING: Figure 3

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, when the prism is provided on the upper side of the lens carrier, the rear side of the prism becomes an empty space, which hinders the miniaturization of the lens driving 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 is provided on a lens carrier having a lens barrel fixing portion for fixing the lens barrel and fixed to a base provided on the upper side of the lens carrier. A prism and a magnet and a coil for moving the lens carrier in the optical axis direction of the lens barrel are provided, and the magnet and the coil are arranged behind the prism which receives light from the front.

Preferably, the lens carrier has a magnet fixing portion formed so as to extend upward from the lens barrel fixing portion, the magnet is fixed to the magnet fixing portion, and the base is attached to the rear surface portion of the base. The coil is fixed so as to face the magnet.

More preferably, the magnet fixing portion is provided on the rear side of the rear slope of the prism.

Preferably, an optical member forming an optical system of the bending optical axis is arranged in the optical axis direction of the lens carrier.

More preferably, a magnetic material is arranged on the rear side of the coil. Further, preferably, the base has a ball receiving portion on the front side of the magnet fixing portion, and the lens carrier is formed so as to extend upward from the lens barrel fixing portion, and the ball is interposed in the ball receiving portion. Has a supported portion facing each other. Further, preferably, the magnet fixing portion and the supported portion are formed so as to extend upward through the left and right sides of the prism, respectively, and are integrally connected on the rear side of the prism. More preferably, the lens barrel fixing portion of the lens carrier has an opening on the front side, and the width of the opening is wider than the width 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 including the camera device.

According to the present invention, since the magnet and the coil are arranged behind the prism, the rear side of the prism can be effectively used, and the lens driving device, the camera device, and the electronic device can be miniaturized.

A lens driving device according to the first embodiment of the present invention is shown, and is a cross-sectional view cut in the vertical direction slightly in front of the right end of the lens driving device. A lens driving device according to the first embodiment of the present invention is shown, and is a cross-sectional view taken along the line II-II of FIG. It is a perspective view which shows the lens driving device which concerns on 1st Embodiment of this invention, and excludes a cover and a front lid body. A lens driving device according to the first embodiment of the present invention is shown, and is a side view of FIG. A lens driving device according to the first embodiment of the present invention is shown, and is a cross-sectional perspective view of FIGS. 3 and 4 excluding a prism and a lens barrel. A lens driving device according to the first embodiment of the present invention is shown, and is a perspective view of FIG. 5 excluding the lens carrier. The lens driving device which concerns on the 2nd Embodiment of this invention is shown, and it is sectional drawing cut in the plane orthogonal to the optical axis direction of a lens barrel. A lens driving device according to a second embodiment of the present invention is shown, and is a cross-sectional view taken along the plane VIII-VIII of FIG. The lens driving device which concerns on 3rd Embodiment of this invention is shown, and it is sectional drawing cut in the plane orthogonal to the optical axis direction of a lens barrel. It is a figure for demonstrating the modification of the lens driving apparatus which concerns on 3rd Embodiment of this invention, FIG. 10A is the sectional view which shows the 3rd Embodiment in a simplified manner, and (b)-(d) are It is sectional drawing which shows each simplified modification example.

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

1 to 6 show the lens driving device 10 according to the first embodiment of the present invention.

The lens driving device 10 has a housing 12. The housing 12 is composed of a cover 14, a front lid body 16, a rear lid body 18, and a base 20. The cover 14 is surrounded by an upper portion and three left and right surfaces, and is fixed to the base 20.

In this specification, as shown in FIG. 1, one of the optical axis directions of the lens barrel 28, which will be described later, is up, the other is down, and one of the directions orthogonal to the optical axis direction of the lens barrel 28 is used. One in one direction orthogonal to the front and the back is called the left, and the other is called the right.

The base 20 has a lower surface portion 20a and a rear surface portion 20b. The lower surface portion 20a and the rear surface portion 20b are connected to each other via the connecting portions 20c on both the left and right sides. Further, the front lid body 16 is formed in a plate shape and is fixed between the lower surface portion 20a of the base 20 and the cover 14. The rear lid body 18 is also formed in a plate shape, and is fixed between the lower surface portion 20a, the rear surface portion 20b, and the connecting portion 20c of the base 20.

The incident hole 22 is configured to be surrounded by the cover 14 and the front lid body 16, so that light from the front is incident through the incident hole 22.

The prism 24 is fixed to the base 20. The prism 24 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 24 is directed to the incident hole 22. As shown in FIG. 2, the rear slope of the prism 24 is fixed to the prism fixing wall portion 20d formed so as to rise forward at the center of the rear surface portion 20b of the base 20. Further, the lower surface of the prism 24 is directed downward. The prism 24 receives light from the front through the incident hole 22, reflects it on a slope, and guides it downward.

The lens carrier 26 has a lens barrel fixing portion 26a for fixing the columnar lens barrel 28. The lens barrel fixing portion 26a is provided with an opening 26b in which the lens barrel 28 can be inserted. The opening 26b is opened toward the front side. At the time of assembly, the lens barrel 28 is inserted into the lens carrier 26 from the front through the opening 26b before the front lid 16 is attached. Further, a lens barrel contact surface 26c is formed on the rear inner surface of the lens barrel fixing portion 26a of the lens carrier 26. The outer surface of the cylindrical lens barrel 28 abuts on the lens barrel contact surface 26c and is fixed to the lens carrier 26 via an adhesive or the like. Further, the inside of the lens barrel contact surface 26c of the lens barrel fixing portion 26a is an opening, and this opening faces the rear lid body 18.

The supporting means for supporting the lens carrier 26 will be described. The base 20 described above is provided with a ball receiving portion 20e for receiving the ball 30. The ball receiving portions 20e are formed on both the left and right sides of the prism fixing wall portion 20d in a concave groove shape having a long vertical direction. For example, three balls 30 are fitted in the left and right ball receiving portions 20e.

On the other hand, the lens carrier 26 is provided so that the supported portion 26e extends forward from the lens barrel fixing portion 26a and faces the ball receiving portion 20e. The supported portion 26e is formed in a V-groove shape extending in the vertical direction, the ball 30 is fitted in the supported portion 26e, and the lens carrier 26 is supported so as to be movable in the vertical direction with respect to the housing 12. There is.

The driving means for moving the lens carrier 26 will be described. The lens carrier 26 is formed with a magnet fixing portion 26f extending forward from the lens barrel fixing portion 26a. That is, the magnet fixing portion 26f is provided so as to sandwich the ball receiving portion 20e of the base 20 with the supported portion 26e. A magnet 34 is fixed to the rear side surface of the magnet fixing portion 26f with a first magnetic body 32 interposed therebetween.

On the other hand, the coil 38 is fixed to the rear surface portion 20b of the base 20 with the second magnetic body 36 interposed therebetween. The coil 38 has a shape in which both sides of a straight portion long in the left-right direction are connected by a semicircular portion. The magnet 34 is formed so that the magnetic poles are separated in the vertical direction, a magnetic circuit is formed by the first magnetic body 32 and the second magnetic body 36, and the magnetic flux passes through the straight portion of the coil 38. Therefore, a current flows in the straight line portion of the coil 38 in the left-right direction, and a magnetic flux passes in the front-rear direction of the coil 38, so that an electromagnetic force in the vertical direction is applied to the lens carrier 26. Further, since the magnet 34 is attracted to the second magnetic body 36 and is supported by the above-mentioned supporting means, the lens carrier 26 does not tilt even if it is supported on one side in the vertical direction.

Further, an exit hole 40 is formed in the lower surface portion 20a of the base 20. Further, a light receiving sensor that receives light that has passed through the lens barrel 28 via the IR filter 42 is provided on the lower side of the lower surface portion 20a to form a camera device. The light receiving sensor is provided on the substrate 52.

In the camera device, the light entering the prism 24 from the subject is bent by the prism 24 by 90 degrees, collected by the lens barrel 28, and detected by the light receiving sensor. Further, the position of the lens barrel 28 is detected by a position sensor (not shown). The camera device is equipped with a controller for focusing the subject. This controller controls so that the current corresponding to the position of the lens barrel 28 flows through the coil 38. When a current is passed through the controller so that the coil 38 is in focus, an electromagnetic force is generated between the magnet 34 and the coil 38, and the lens carrier 26 supported by the ball 30 moves together with the lens barrel 28. It is in focus. The current is controlled so that the lens barrel 28 stays at that position when it comes into focus.

7 and 8 show the lens driving device 10 according to the second embodiment of the present invention. In FIGS. 7 and 8, the optical system of the bent optical axis is omitted.

In this second embodiment, the housing 12 is composed of a main body 44 and a lid 46. In the first embodiment described above, the ball 30 is biased to one side in the optical axis direction of the lens barrel 28, and the lens carrier 26 is supported on one side in the vertical direction. However, in the second embodiment, the ball 30 is supported on one side in the vertical direction. The lens carrier 26 is supported from both sides in the vertical direction.

That is, a total of eight balls 30 are arranged on the left and right, front and back, and top and bottom. Ball receiving portions 20e are provided at eight locations on the left and right, front and back, and top and bottom of the housing 12 corresponding to the balls 30. Each ball receiving portion 20e has a V-groove shape extending in the vertical direction. The rear ball receiving portion 20e is formed by the main body portion 44 of the housing 12. The front ball receiving portion 20e is formed by a main body portion 44 and a lid body 46. Further, the lens carrier 26 is provided with a supported portion 26e facing the ball receiving portion 20e. The supported portion 26e is a flat surface extending in the vertical direction. The ball 30 is fitted between each ball receiving portion 20e and the supported portion 26e. The lens carrier 26 to which the lens barrel 28 is fixed is movably supported by the housing 12 in the vertical direction via these eight balls 30.

Also in this second embodiment, as in the first embodiment, the lens carrier 26 is provided with an opening 26b that is open forward. At the time of assembly, the lens barrel 28 is inserted into and fixed to the lens carrier 26 from the front through the opening 26b before the lid body 46 is attached.

The driving means for moving the lens carrier 26 of the second embodiment has one of the coil 38 or the magnet 34 on the outer surface of the lens carrier 26 between the front and rear supported portions 26e on the inner surface of the housing 12. The other may be arranged so as to face the one. In that case, the pair of the coil 38 and the magnet 34 may be provided on both the left and right sides. In FIGS. 7 and 8, the coil 38 is provided in the housing 12 and the magnet 34 is provided in the lens carrier 26. Further, although not shown, the lens carrier 26 may be extended upward as in the first embodiment, and either one of the coil 38 or the magnet 34 may be arranged in the lens carrier 26 and the other in the housing 12.

FIG. 9 shows a third embodiment of the present invention.

In the third embodiment, the frame body 48 composed of the first frame body 48a and the second frame body 48b is provided. The periphery of the frame body 48 is covered with a cover 14. The lens carrier 26 is supported in the frame body 48 so as to be movable in the vertical direction via the ball 30. For example, three balls 30 are provided at each location in the vertical direction. Further, the optical system of the bending optical axis such as the prism 24 is not provided.

The front ball 30 fits into the ball receiving portion 20e composed of the first frame body 48a and the second frame body 48b, and the rear ball 30 fits into the ball receiving portion 20e formed in the second frame body 48b. Each ball 30 is in contact with the supported portion 26e formed on the lens carrier 26.

The first frame body 48a is placed so as to be slidable with respect to the second frame body 48b at the time of assembly, and the ball 30 is moved by sliding the first frame body 48a toward the ball 30. The ball receiving portion 20e to be regulated is formed.

A magnet 34 and a first magnetic body 32 are fixed to the rear surface of the second frame body 48b. The coil 38 faces the magnet 34 and is fixed to the lens carrier 26.

The frame body 48, the lens carrier 26, the ball 30, the magnetic body 32, the magnet 34, and the coil 38 are supported by suspension wires 50 at four corners in the front-rear and left-right directions, and are supported so as to be movable in the front-back and left-right directions. There is.

Also in this third embodiment, as in the first embodiment and the second embodiment, the lens carrier 26 is provided with an opening 26b that opens forward. At the time of assembly, the lens barrel 28 is inserted into and fixed to the lens carrier 26 from the front through the opening 26b before the cover 14 and the first frame body 48a are attached.

A modified example of the third embodiment will be described with reference to FIG. In contrast to the above-mentioned example shown in FIG. 10A, in the example shown in FIG. 10B, the left and right ends of the first frame body 48a are extended to the rear side, and the front ball receiving portion 20e is only the first frame body 48a. It is composed of.

Further, as shown in FIG. 10C, the rear ball receiving portion 20e and the supported portion 26e may be integrated and provided at an intermediate position thereof. At that time, a V-groove formed by two planes is formed in the central portion of the second frame body 48b and the central portion of the lens carrier 26, respectively. Further, in this case, the driving means is provided so as to avoid the supporting means behind the driving means.

Further, as shown in FIG. 10D, the right and left ball receiving portions 20e and the supported portions 26e may be integrated and provided at an intermediate position thereof. At that time, the first frame body 48a is slid from the right side at the time of assembly. Further, the lens barrel 28 is inserted and fixed to the lens carrier 26 from the front, and the third frame body 48c is attached.

Since there is no special member in the front direction of the lens barrel 28 as in the above embodiment, it is convenient as a direction for inserting the lens barrel 28 into the lens carrier 26, but the present invention is limited to this. It's not a thing. For example, the opening 26a of the lens carrier 26 may be formed so that the lens barrel 28 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 28 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 28, for example, with respect to the optical axis direction. The lens barrel 28 may be inserted at an angle.

10 Lens drive device 12 Housing 14 Cover 16 Front lid 18 Rear lid 20 Base 22 Incident hole 24 Prism 26 Lens carrier 26a Lens barrel fixing part 28 Lens barrel 30 Ball 32 1st magnetic body 34 Magnet 36 2nd magnetic Body 38 Coil 40 Exit hole 42 IR filter 48 Frame

Claims (9)

A lens carrier having a lens barrel fixing part for fixing the lens barrel,
A prism provided on the upper side of the lens carrier and fixed to the base,
A magnet and a coil for moving the lens carrier in the optical axis direction of the lens barrel are provided.
A lens driving device in which the magnet and the coil are arranged behind the prism that receives light from the front. The lens carrier has a magnet fixing portion formed so as to extend upward from the lens barrel fixing portion, and the magnet is fixed to the magnet fixing portion.
The lens driving device according to claim 1, wherein the base is fixed to a rear surface portion of the base so that the coil faces the magnet. The lens driving device according to claim 2, wherein the magnet fixing portion is provided on the rear side of the rear slope of the prism. The lens driving device according to claim 2, wherein a magnetic material is arranged on the rear side of the coil. The base has a ball receiving portion on the front side of the magnet fixing portion.
The lens driving device according to claim 4, wherein the lens carrier is formed so as to extend upward from the lens barrel fixing portion and has a supported portion that faces the ball receiving portion via a ball. The lens driving device according to claim 5, wherein the magnet fixing portion and the supported portion are formed so as to extend upward through the left and right sides of the prism, respectively, and are integrally connected to each other on the rear side of the prism. The lens driving device according to claim 1, wherein the lens barrel fixing portion of the lens carrier has an opening on the front side, and the width of the opening is wider than the width of the lens barrel. A camera device including the lens driving device according to any one of claims 1 to 7 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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