Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device, a camera device and an electronic device. In the lens driving device, the bonding strength between a position detection magnet and a position sensor is strong. The lens driving device 1 comprises: a carrier (50) having a through hole (51) for holding a lens body (4); a position detection magnet (60); and a position sensor (96). Thus, the carrier (50) has a storage recess (56) opening toward the position sensor (96), and the storage recess (56) has: a first side surface (561) facing the position sensor (96) and extending along the optical axis direction of the lens body (4); and a second side surface (562) extending in a direction orthogonal to the optical axis direction, and a bonding agent recess (530) is provided on the second side surface (562) that is recessed toward the optical axis direction, and the position detection magnet (60) is bonded and fixed to the first side surface (561) and the second side surface (562).

Description

Technical Field

[0001] The present invention relates to a lens driving device, a camera device and an electronic device used in electronic devices such as a smart phone. Background Art

[0002] In a lens driving device for a camera equipped with an autofocus function, a position detection magnet and a position sensor are respectively arranged on the opposite walls of a carrier holding a lens body and a frame that stores the carrier, and the driving amount of the carrier is controlled based on the detection signal of the position sensor. As a document that discloses technology related to such a lens driving device, there is Patent Document 1. The camera module disclosed in Patent Document 1 has a coil frame and a coil that form a carrier, a base, a housing, a cover component and a driving magnet that form a frame, and a position sensing sensor and a sensing magnet that form a sensing unit. Therefore, in such a camera module, the position sensing sensor is fixed to one side of the housing. In addition, a bonding groove that is recessed inwardly to a specified depth is provided on the outer peripheral surface of the coil frame opposite to the position sensing sensor, and the sensing magnet is embedded in the groove and fixed by an adhesive injected into the groove.

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Publication No. 2017-510841A Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, in such a lens driving device, as the device is miniaturized and the lens is enlarged, the width of the carrier has to be reduced as much as possible, so there is no room for providing an adhesive groove recessed inwardly in the carrier.

[0008] The present invention has been made in view of the above problems, and an object of the present invention is to provide a lens driving device in which positional displacement of a detection magnet relative to a carrier position is unlikely to occur.

[0009]

Methods for solving the problem

[0010] In order to solve the above-mentioned problems, a lens driving device as a preferred embodiment of the present invention is characterized in that it comprises: a carrier having a through hole for holding a lens body; a magnet for position detection; and a position sensor, wherein the carrier has a storage recess opening toward the position sensor, and the storage recess has: a first side surface, which is opposite to the position sensor and extends along the optical axis direction of the lens body; and a second side surface, which extends in a direction orthogonal to the optical axis direction, and a recess for an adhesive which is recessed toward the optical axis direction is provided on the second side surface, and the magnet for position detection is bonded and fixed to the first side surface and the second side surface.

[0011] In this aspect, the second side surface may be a front side surface in the optical axis direction.

[0012] Furthermore, an adhesive may be provided in the adhesive recess.

[0013] Furthermore, the second side surface may be a rear side surface facing the optical axis direction.

[0014] Furthermore, the housing recess may include a third side surface and a fourth side surface extending along the optical axis direction and intersecting the first side surface and the second side surface, and the position detection magnet may be fixedly bonded to the third side surface and the fourth side surface.

[0015] A camera device according to another aspect of the present invention is characterized by including the above-mentioned lens driving device.

[0016] An electronic device according to another aspect of the present invention includes the camera device described above.

[0017] [Effects of the invention]

[0018] The lens driving device of the present invention comprises a carrier having a through hole for holding a lens body, a position detection magnet and a position sensor, wherein the carrier has a storage recess opening toward the position sensor, and the storage recess has: a first side surface, which is opposite to the position sensor and extends along the optical axis direction of the lens body; and a second side surface, which extends in a direction orthogonal to the optical axis direction, and a recess for adhesive recessed toward the optical axis direction is provided on the second side surface, and the position detection magnet is bonded and fixed to the first side surface and the second side surface. The recess for adhesive becomes an adhesive storage area of ​​the second side surface. The area of ​​the adhesive surface of the adhesive increases, and the bonding strength of the position detection magnet 60 increases. In addition, generally, the bonding force of the interface between the adhesive and the position detection magnet 60 is stronger than that of the interface between the adhesive and the carrier 50. Therefore, even if peeling occurs between the adhesive and the carrier 50, the adhesive that has entered the adhesive recess and hardened will be caught in the adhesive recess, thereby suppressing the sliding of the position detection magnet 60. Therefore, it is possible to provide a lens driving device that is unlikely to cause positional deviation of the position detection magnet relative to the carrier. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a front view of a smartphone 100 equipped with a camera device 9 including the lens driving device 1 as one embodiment of the present invention.

[0020] Figure 2 It is decomposition Figure 1 A stereoscopic view of the lens driving device 1.

[0021] Figure 3 Viewed from the -Z side Figure 1 FIG. 1 is a diagram showing the vicinity of the housing recess 56 in the lens driving device 1 .

[0022] Figure 4 is observed from the +X side and Figure 3 A cross-sectional view of a section parallel to the YZ plane. DETAILED DESCRIPTION

[0023] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, a camera device 9 including a lens driving device 1 according to an embodiment of the present invention is accommodated in a housing of a smartphone 100 .

[0024] The camera device 9 includes a lens body 4 , an image sensor 6 that converts light incident through the lens body 4 into an image signal, and a lens driving device 1 that holds the lens body 4 and the image sensor 6 and drives the lens body 4 .

[0025] Here, hereinafter, the optical axis direction of the lens body 4 is appropriately referred to as the Z direction, a direction orthogonal to the Z direction is appropriately referred to as the X direction, and a direction orthogonal to both the Z direction and the X direction is appropriately referred to as the Y direction. In addition, when viewed from the lens body 4, the side of the subject in the optical axis direction is sometimes referred to as the front side, and the opposite side (the image sensor 6 side) is sometimes referred to as the rear side. The front side corresponds to the +Z side, and the rear side corresponds to the -Z side.

[0026] like Figure 2 As shown, the lens driving device 1 includes a cover 10 , a spacer 20 , a front spring 30 , a driving magnet 40 , a coil 41 , a carrier 50 , a position detection magnet 60 , a balance member 61 , a rear spring 70 , a base 80 , and an FPC (Flexible printed circuits) 90 .

[0027] The cover 10 includes a front plate 11 and side plates 15 extending from four sides of the front plate 11 to the Z side. The cover 10 is formed by stamping an iron plate as a magnetic body. The base 80 includes a rear plate 81, four pillars 82 rising from four corners of the rear plate 81 along the +Z side, side plates 83 and 84 rising from the end edges of the rear plate 81 on the -Y side and +Y side to the +Z side, and a metal member 87 partially embedded in the rear plate 81.

[0028] The spacer 20 , the front spring 30 , the driving magnet 40 , the coil 41 , the carrier 50 , the position detection magnet 60 , the balance member 61 , the rear spring 70 , and the FPC 90 are housed in a housing formed by combining the base 80 and the cover 10 .

[0029] The carrier 50 has an octagonal shape with four corners of the quadrilateral chamfered when viewed from the Z direction. A through hole 51 serving as a holding portion for holding the lens body 4 is provided at the center of the carrier 50. The coil 41 is wound around the side surface of the carrier 50 with the Z direction as the axis.

[0030] The inner ring portion of the front spring 30 is fixed to the peripheral edge portion 53 surrounding the through hole 51 on the front surface of the carrier 50. The inner semi-inner ring portion of the rear spring 70 divided into two is fixed to the peripheral edge portion 57 surrounding the through hole 51 on the rear surface of the carrier 50.

[0031] The peripheral edge of the outer side of the front spring 30 is fixed to the spacer 20. The peripheral edge is connected to the inner ring through four wrists. The spacer 20 is fixed to the periphery of the front plate 11 of the cover 10. The driving magnet 40 is fixed to the inner surface of the side plate 15 on the +X side and the -X side of the cover 10. The driving magnet 40 is parallel to the coil 41 with a slight gap. The driving magnet 40 and the coil 41 generate a Z-direction driving force of the carrier 50.

[0032] The outer peripheral edge of the rear spring 70 is fixed to the peripheral edge of the rear plate 81 of the base 80. Each peripheral edge is connected to the semi-inner ring portion at two arms. Two rectangular openings 88 and 89 are provided on the side plate 83 on the -Y side of the base 80. The FPC 90 is fixed to the side plate 83.

[0033] like Figure 3 as well as Figure 4 As shown, a position sensor 96 is fixed to the inner surface of the FPC 90. The position sensor 96 is received in the opening 88 from the -Y side of the opening 88 of the side plate 83. The position sensor 96 has, for example, a Hall element for detecting the magnetic properties of the position detection magnet 60. In addition, a rectangular storage recess 56 is provided at a position opposite to the position sensor 96 in the side portion 55 of the carrier 50 and is hollowed out toward the opposite side of the position sensor 96.

[0034] The storage recess 56 is surrounded by a first side surface 561, a second side surface 562, a third side surface 563, and a fourth side surface 564. The first side surface 561 is parallel to and opposite to the position sensor 96, and extends in the ZX direction along the optical axis of the lens body 4. The second side surface 562 extends in the XY direction orthogonal to the optical axis direction of the lens body 4. The third side surface 563 and the fourth side surface 564 are opposite to each other in the X direction, and extend in the YZ direction along the optical axis direction of the lens body 4. The first side surface 561 intersects with the third side surface 563 and the fourth side surface 564 on the -X side and the +X side. The first side surface 561, the third side surface 563, and the fourth side surface 564 intersect with the second side surface 562 on the +Z side. A recess 530 for adhesive that is recessed toward the front side in the optical axis direction is provided on the second side surface 562.

[0035] The storage recess 56 is open at the −Y side opposite to the first side surface 561 and at the −Z side opposite to the second side surface 562 . The −Y side open portion of the storage recess 56 is covered by the coil 41 .

[0036] The storage recess 56 stores and fixes the position detection magnet 60 by bonding. Adhesive is supplied between the first side surface 561 and the second side surface 562 of the storage recess 56 and the position detection magnet 60. The position detection magnet 60 is fixed by at least the adhesive of the first side surface 561 and the second side surface 562. In addition, the adhesive between the position detection magnet 60 and the second side surface 562 enters the adhesive recess 530, and an adhesive storage area is formed in the adhesive recess 530. The position sensor 96 detects the position of the position detection magnet 60, that is, the position of the carrier 50 and / or the lens body 4, by detecting the magnetic field from the position detection magnet 60.

[0037] A second housing recess is provided outside the peripheral edge portion 57 of the carrier 50 at a position symmetrical to the center point of the through hole 51. The second housing recess is provided with a balancing member 61. The balancing member 61 is used to achieve balance with the position detection magnet 60.

[0038] The above is the details of the structure of this embodiment. The lens driving device 1 of this embodiment includes: a carrier 50 having a through hole 51 for holding the lens body 4; a position detection magnet 60; and a position sensor 96. Therefore, the carrier 50 has a storage recess 56 that opens toward the position sensor 96, and the storage recess 56 has: a first side surface 561 that extends along the optical axis direction of the lens body 4 opposite to the position sensor 96; and a second side surface 562 that extends in a direction orthogonal to the optical axis direction, and a recess 530 for adhesive that is recessed toward the optical axis direction is provided on the second side surface 562, and the position detection magnet 60 is bonded and fixed to the first side surface 561 and the second side surface 562. The adhesive recess 530 becomes an adhesive storage area in the second side surface 562. The area of ​​the adhesive surface increases, and the bonding strength of the position detection magnet 60 increases. In addition, generally speaking, the adhesive force is stronger at the interface between the adhesive and the position detection magnet 60 than at the interface between the adhesive and the carrier 50. Therefore, if peeling occurs between the adhesive and the carrier 50, the adhesive that enters the adhesive recess 530 and hardens will hang on the adhesive recess 530, so that the sliding of the position detection magnet 60 along the X direction and the Y direction is suppressed. Therefore, it is possible to provide a lens driving device 1 that is unlikely to cause positional misalignment of the position detection magnet 60 relative to the carrier 50.

[0039] In the present embodiment, adhesive may also be applied to the third side surface 563 and the fourth side surface 564 of the storage recess 56 , and the position detection magnet 60 may be fixed by the adhesive on each of the first to fourth side surfaces 561 to 564 and in the adhesive recess 530 .

[0040] In addition, in the present embodiment, a housing recess 56 which is hollowed out toward the rear side in the optical axis direction may be provided on the front surface of the carrier 50 .

[0041]

Explanation of symbols

[0042] 1 lens driving device; 4 lens body; 6 image sensor; 9 camera device; 10 cover; 11 front plate; 15, 83 side plates; 20 spacer; 30 front spring; 40 driving magnet; 41 coil; 50 carrier; 51 through hole; 53, 57 peripheral edge; 55 side; 56 storage recess; 60 position detection magnet; 61 balance member; 70 rear spring; 80 base; 81 rear plate; 82 column; 87 metal member; 88, 89 opening; 90 FPC; 96 position sensor; 100 smart phone; 530 adhesive recess; 561 first side surface; 562 second side surface; 563 third side surface; 564 fourth side surface.

Claims

1. A lens driving device, characterized in that: have: A carrier having a through hole for holding the lens body; A magnet for position detection; and Position sensor, The carrier has a receiving recessed portion opening toward the position sensor, The storage recess has: a first side surface, which is opposite to the position sensor and extends along the optical axis direction of the lens body; and a second side surface, which extends in a direction orthogonal to the optical axis direction. The second side surface is provided with an adhesive recessed portion recessed toward the optical axis direction, and the position detection magnet is bonded and fixed to the first side surface and the second side surface.

2. The lens driving device according to claim 1, characterized in that: The second side surface is a front side surface in the optical axis direction.

3. The lens driving device according to claim 1 or 2, characterized in that: An adhesive is provided in the adhesive recess.

4. The lens driving device according to claim 1, characterized in that: The second side surface is a rear side surface facing the optical axis direction.

5. The lens driving device according to claim 1, characterized in that: The storage recess has a third side surface and a fourth side surface extending along the optical axis direction and intersecting the first side surface and the second side surface. The position detection magnet is fixedly bonded to the third side surface and the fourth side surface.

6. A camera device, characterized in that: A lens driving device according to any one of claims 1 to 5.

7. An electronic device, characterized in that: A camera device according to claim 6.

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