Lens driving device, camera module, and camera-equipped device

Abstract

The lens driving device of the present application includes: a movable portion; a driving portion; a magnet portion having a first magnetic pole and a second magnetic pole; and a position detection portion disposed opposite the magnet portion, which detects the position of the magnet portion by detecting a magnetic field in a plane including a direction of an optical axis and a width direction, the boundary extending in a curved manner with a change in the angle formed by the boundary and the direction of the optical axis.

Description

Technical Field

[0001] This invention relates to a lens driving device, a camera module, and a camera mounting device. Background Technology

[0002] Previously, camera modules were known to be mounted on thin camera mount devices such as smartphones. Among these camera modules, those equipped with a lens drive device were known to have a zoom function that could magnify or reduce the size of the image being photographed.

[0003] For example, Patent Document 1 discloses a structure comprising: a fixed lens into which light from a photographed object is incident; two movable lenses into which light refracted by the fixed lens is incident; and a lens drive unit for moving the two movable lenses along the optical axis.

[0004] In such a lens driving device, in order to detect the position of the movable lens in the direction of the optical axis, a magnet part and a position detection part (e.g., a Hall element) for detecting the magnetic flux of the magnet part are provided in the movable part where the movable lens is provided. The magnet part is provided with two adjacent different magnetic poles (N pole and S pole), and the magnet part is configured such that the magnetic force at the opposite part opposite to the position detection part changes according to the position of the movable lens.

[0005] Existing technical documents

[0006] Patent documents

[0007] Patent Document 1: Japanese Patent Application Publication No. 2018-36416 Summary of the Invention

[0008] The problem the invention aims to solve

[0009] However, in small camera mount devices, for example, if the position of the magnets in the opposing directions of two different magnetic poles deviates from the desired position due to assembly errors, the positional relationship between them and the position detection unit will also deviate. Therefore, it may be impossible to accurately detect the position of the movable lens.

[0010] The purpose of this invention is to provide a lens driving device, a camera module, and a camera mounting device capable of accurately detecting the position of a movable lens.

[0011] Solution to the problem

[0012] The lens driving device of the present invention includes:

[0013] The movable part is arranged in the direction of the optical axis and can hold the movable lens.

[0014] The driving unit drives the movable part along the direction of the optical axis;

[0015] A magnet portion, disposed on the movable portion and extending along the direction of the optical axis, having a first magnetic pole and a second magnetic pole arranged adjacent to each other at a boundary in a width direction orthogonal to the direction of the optical axis; and

[0016] A position detection unit, disposed opposite to the magnet unit, detects the position of the magnet unit by detecting the magnetic field in a surface including the direction of the optical axis and the width direction.

[0017] The boundary extends in a curved manner, with the angle between the boundary and the direction of the optical axis varying.

[0018] The camera module of the present invention includes:

[0019] The aforementioned lens driving device;

[0020] The lens portion includes the movable lens held in the movable portion; and

[0021] The camera unit captures an image of the subject formed through the lens unit.

[0022] The camera module drives the movable lens along the direction of the optical axis.

[0023] The camera mounting device of the present invention is an information device or a transportation device, and includes:

[0024] The aforementioned camera module; and

[0025] The camera control unit processes the image information obtained by the camera module.

[0026] Invention Effects

[0027] According to the present invention, the position detection of a movable lens can be performed accurately. Attached Figure Description

[0028] Figure 1 This is a diagram that simply illustrates a camera module according to an embodiment of the present invention.

[0029] Figure 2 This is a diagram that simply shows the structure of the camera module of this embodiment as viewed from the side.

[0030] Figure 3 This is a 3D view showing the housing portion of the camera module.

[0031] Figure 4 This is a perspective view of the bottom wall side of the camera module's housing.

[0032] Figure 5 This is an exploded perspective view of the housing and lens section.

[0033] Figure 6 It is an exploded perspective view of the side wall and bottom wall of the shell.

[0034] Figure 7 This is a diagram of the shell viewed from the Z-direction + side.

[0035] Figure 8 This is a diagram showing the inner side of the shell viewed from one side in the X direction.

[0036] Figure 9 This is a diagram representing the guided part.

[0037] Figure 10 This is a diagram showing the connection between the lens and the frame.

[0038] Figure 11 It is an exploded perspective view of the guided part and the clamping part.

[0039] Figure 12A This is a diagram used to illustrate the adjustment of the positional relationship between the clamping part and the guide shaft.

[0040] Figure 12B This is a diagram used to illustrate the adjustment of the positional relationship between the clamping part and the guide shaft.

[0041] Figure 13 This is a diagram showing the second clamping component.

[0042] Figure 14 This is a diagram showing the configuration relationship between the clamping part and the ultrasonic motor.

[0043] Figure 15 This is a 3D diagram of an ultrasonic motor.

[0044] Figure 16 This is an exploded 3D view of an ultrasonic motor.

[0045] Figure 17 This is an enlarged view of the contact area between the resonant part and the clamping part.

[0046] Figure 18 This is a diagram used to illustrate the structure of the guide section.

[0047] Figure 19 This is a diagram used to illustrate the structure of the guide section.

[0048] Figure 20 A diagram showing the structure of the magnet section.

[0049] Figure 21A It is a diagram used to illustrate the positional relationship between the magnet and the position detection unit.

[0050] Figure 21B It is a diagram used to illustrate the positional relationship between the magnet and the position detection unit.

[0051] Figure 21C It is a diagram used to illustrate the positional relationship between the magnet and the position detection unit.

[0052] Figure 22 It is a graph showing the variation of magnetic flux density at various positions along the Y direction of the frame.

[0053] Figure 23 This is a diagram showing the structure of the magnet part in a modified example.

[0054] Figure 24 This is a diagram showing the structure of the magnet part in a modified example.

[0055] Figure 25 This is a diagram showing the structure of the magnet part in a modified example.

[0056] Figure 26 This is a diagram showing the structure of the magnet part in a modified example.

[0057] Figure 27 This is a diagram showing a structure with multiple position detection units.

[0058] Figure 28A This is a diagram representing a smartphone equipped with a camera module.

[0059] Figure 28B This is a diagram representing a smartphone equipped with a camera module.

[0060] Figure 29A This is a diagram showing a car equipped with a camera module.

[0061] Figure 29B This is a diagram showing a car equipped with a camera module. Detailed Implementation

[0062] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings. Figure 1 This is a diagram that simply illustrates a camera module 1 according to an embodiment of the present invention. Figure 2 This is a diagram that simply shows the structure of the camera module 1 of this embodiment as viewed from the side.

[0063] Camera module 1, for example, is mounted on smartphone M (see reference). Figure 28A , Figure 28B Slim camera mount devices such as portable phones, digital camcorders, laptops, tablets, portable game consoles, and vehicle-mounted cameras.

[0064] In the description of the structure of the camera module 1 in this embodiment, an orthogonal coordinate system (X, Y, Z) is used. The same orthogonal coordinate system (X, Y, Z) is also used in the figures described later. For example, the camera module 1 is mounted such that, when the camera mounting device is actually taking pictures, the X direction is the left-right direction, the Y direction is the up-down direction, and the Z direction is the front-back direction. Light from the object being photographed enters from the Z-direction - side (negative side), is refracted, and then guided to the Y-direction + side (positive side). By reducing the thickness of the camera module 1 in the Z direction, a thinner camera mounting device can be achieved.

[0065] like Figure 1 As shown, the camera module 1 includes: a housing 10, a reflection drive unit 20, a lens unit 30, an image capture unit 40, and a support shaft 50 (see reference). Figure 3 ), Lens drive unit 60 (refer to) Figure 5 ), Position detection unit 70 (refer to) Figure 10 ) and drive control unit 100.

[0066] The drive control unit 100 includes a CPU (Central Processing Unit), ROM (Read-Only Memory), and RAM (Random Access Memory). The CPU reads a program corresponding to the processing content from the ROM and expands it in the RAM. It then operates in conjunction with the expanded program to centrally control the lens drive unit 60. As a result, the drive control unit 100 drives the second lens unit 32 and the third lens unit 33 (described later) housed in the lens unit 30 of the housing 10 in the Y direction (direction of the optical axis). Consequently, the camera module 1 performs stepless optical zoom and autofocus. The housing 10, support shaft 50, lens drive unit 60, position detection unit 70, and drive control unit 100 correspond to the "lens drive device" of the present invention.

[0067] In addition, such as Figure 2 As shown, in camera module 1, incident light L1 is incident on housing 10 via reflection drive unit 20. Reflection drive unit 20 includes a reflective housing 21, a reflector 22, and a reflection drive control unit 23. Figure 1 and Figure 2 In the example shown, the reflective housing 21 is disposed adjacent to one end of the housing 10 in the Y direction. The reflector 22 is disposed inside the reflective housing 21 and reflects the incident light L1 as reflected light L2 back to the housing 10. The reflection drive control unit 23 has a CPU, ROM, RAM, etc., and controls the direction of the reflector 22.

[0068] Furthermore, the reflector 22 in this embodiment has two rotation axes (not shown) extending in the X and Y directions. In the reflection drive unit 20, under the control of the reflection drive control unit 23, the reflector 22 rotates around these rotation axes. As a result, the camera module 1 has a shake correction function (OIS (Optical Image Stabilization) function) that optically corrects the shaking (vibration) generated during shooting to reduce image blur.

[0069] The reflected light L2 incident on the housing 10 is output to the camera unit 40 via the lens unit 30 housed in the housing 10.

[0070] The camera unit 40 is disposed on the outer surface of the housing 10 in the Y direction on the + side (the placement part 112B of the second wall 112 described later), and is configured to allow the reflected light L2 to enter through the lens part 30. The camera unit 40 includes an imaging element and a substrate, etc. (not shown).

[0071] The imaging element is, for example, a CCD (Charge Coupled Device) type image sensor or a CMOS (Complementary Metal Oxide Semiconductor) type image sensor. The imaging element is mounted on a substrate and electrically connected to wiring on the substrate via bonding wires. The imaging element captures an image of the subject image formed by the lens section 30 and outputs an electrical signal corresponding to the captured image.

[0072] Additionally, a printed wiring board (not shown) is electrically connected to the substrate of the camera unit 40, through which power is supplied to the camera element and electrical signals of the image of the subject captured by the camera element are output. These electrical signals are output to the camera control unit 200 provided in the camera mounting device. The camera control unit 200 includes a CPU, ROM, RAM, etc., and processes the image information obtained from the camera module 1. The camera control unit 200 can be mounted on the camera mounting device, but it can also be built into the camera module 1.

[0073] like Figure 3 As shown, the housing 10 accommodates the lens section 30, the support shaft 50, and the lens drive section 60 (see also [reference]). Figure 5 For example, it has a cuboid shape as a whole. The housing 10 has a side wall portion 11 and a bottom wall portion 12.

[0074] The side wall portion 11 is a wall portion, for example made of resin, having a portion that opens in the Y direction, and having a first wall 111, a second wall 112, a third wall 113, and a fourth wall 114 (see also...). Figure 7 wait).

[0075] The first wall 111 is configured to extend along the Y direction and has a pair of sections on both sides in the X direction. In the pair of first walls 111, a placement section 111A is provided on the inner surface of the housing 10 on the positive side of the first wall 111 in the X direction. This placement section 111A is used to place the ultrasonic motor, which will be described later. The placement sections 111A are respectively provided on both sides of the central portion in the Y direction on the positive side of the first wall 111 in the X direction.

[0076] In addition, such as Figure 4 As shown, a terminal portion 111C is provided on the first wall 111 on the + side in the X direction. The terminal portion 111C has terminals (not shown) arranged throughout the inside and outside of the housing 10, for example, through the gap formed between the first wall 111 and the bottom wall portion 12. The portion of the terminal arranged on the outside of the housing 10 is connected to the standard wiring of the camera mounting device.

[0077] In addition, a locking portion 111B is formed on the bottom surface (the side surface in the Z direction) of the first wall 111 for engaging with the positioning portion 121 of the bottom wall portion 12.

[0078] like Figure 3 and Figure 4 As shown, the second wall 112 extends along the X direction and is configured to connect the + side ends of a pair of first walls 111 in the Y direction. Furthermore, on the top surface (the + side surface in the Z direction) of the second wall 112, support portions 112A for supporting the support shaft 50 are provided on both sides in the X direction. A placement portion 112B is provided on the outer surface of the second wall 112 for placing the camera unit 40.

[0079] Additionally, a guide support portion 112C and an opening portion 112D are provided within the configuration portion 112B of the second wall 112. In this embodiment, the guide support portion 112C is a hole that supports the guide shafts 81 and 82 (described later), and is located within the configuration portion 112B at a position further to the side in the X direction than the opening portion 112D. Two guide support portions 112C are arranged side by side in the Z direction. The opening portion 112D is an opening for fitting the fourth lens unit 34 of the lens portion 30, and is located at the center of the configuration portion 112B in the X direction.

[0080] like Figure 3 and Figure 5 As shown, a third wall 113 is provided at each of the ends of a pair of first walls 111 in the Y direction. The pair of third walls 113 are respectively provided in such a way that they surround the space formed by the first wall 111 and the second wall 112. Between the pair of third walls 113, there is a gap that allows the first lens unit 31 of the lens section 30 to enter, and a bridging portion 113A is provided to bridge the ends of each third wall 113 in the Z direction.

[0081] Additionally, a support portion 113B for supporting the support shaft 50 is provided on the top surface (the + side surface in the Z direction) of the pair of third walls 113. A guide support portion 113C for supporting the guide shafts 81 and 82 (described later) is provided near the center of the pair of third walls 113 in the Z direction.

[0082] The guide support 113C is an elongated hole, the length of which in the Z direction is configured to correspond to the arrangement range of the two guide supports 112C on the second wall 112. The guide support 113C is capable of supporting the guide shafts 81 and 82, which are supported by each of the two guide supports 112C on the second wall 112.

[0083] like Figure 5 As shown, the fourth wall 114 forms the bottom wall of the space formed by each of the first walls 111, the third wall 113 corresponding to the first wall 111, and the second wall 112, and is disposed in the region corresponding to the third wall 113 in the X direction (see also...). Figure 7 Therefore, a gap is left between the fourth walls 114 on both sides in the X direction.

[0084] like Figures 4-6 As shown, the bottom wall portion 12 is a generally rectangular metal plate constituting the bottom wall of the housing 10, arranged in such a way that it bridges the fourth walls 114 on both sides in the X direction with a pair of first walls 111. The bottom wall portion 12 is integrally formed with the bottom surface portion of the side wall portion 11, which includes the bottom of the pair of first walls 111, by insert molding. In addition, a portion of the bottom wall portion 12 on one side in the Y direction is cut off, so that there is no portion of the bottom wall portion 12 in the part corresponding to the first lens unit 31.

[0085] Positioning portions 121 are provided at both ends of the bottom wall portion 12 in the X direction. The positioning portions 121 protrude from both ends of the bottom wall portion 12 and engage with the engaging portions 111B of the first wall 111. Thus, positioning of the bottom wall portion 12 in the Y direction is possible.

[0086] In addition, such as Figure 6 As shown, a bent portion 122 is provided at the side end in the X and Y directions of the bottom wall portion 12. The bent portion 122 is provided by bending this side end towards the + side in the Z direction.

[0087] Additionally, a groove (not shown) is formed in the portion of the housing 10 corresponding to the bent portion 122 for the bent portion 122 to enter. By allowing the bent portion 122 to enter the groove, the bottom wall portion 12 is fixed to the housing 10.

[0088] Furthermore, a plurality of half-punched holes 123 arranged side by side in the Y direction are formed on the surface of the bottom wall portion 12. The half-punched holes 123 are provided throughout the X direction of the bottom wall portion 12. In this embodiment, a total of 6 half-punched holes 123 are provided.

[0089] By setting the semi-perforated holes 123 in this way, the strength of the bottom wall portion of the housing 10 can be improved.

[0090] like Figure 3 and Figure 5 As shown, the lens section 30 is disposed at the reflected light L2 (refer to) from the reflection drive section 20. Figure 2 The region through which the lens passes, sandwiched between a pair of first walls 111. The lens section 30 has a first lens unit 31, a second lens unit 32, a third lens unit 33 and a fourth lens unit 34 arranged side by side in the Y direction.

[0091] The first lens unit 31 is positioned at the upstream side of the incident direction of the reflected light L2 (towards the + side in the Y direction) and is fixed between a pair of third walls 113 in the housing 10.

[0092] The side surface of the first lens unit 31 is configured, for example, to be curved in a convex manner with a central portion in the Z direction. The side surface of the third wall 113 on the side of the first lens unit 31 has, for example, a shape along the side surface of the first lens unit 31 and is configured to allow the curved portion of the first lens unit 31 to be inserted. Thus, the first lens unit 31 is fixed between a pair of third walls 113.

[0093] The second lens unit 32 is positioned further downstream than the first lens unit 31 in the incident direction, and has a main body 32A and a supported portion 32B. The third lens unit 33 is positioned further downstream than the second lens unit 32 in the incident direction, and has a main body 33A and a supported portion 33B. The second lens unit 32 corresponds to the "first movable part" of the present invention, and the third lens unit 33 corresponds to the "second movable part" of the present invention.

[0094] Each main body portion 32A and 33A is a part that holds a lens through which light passing through the first lens unit 31 passes. The supported portions 32B and 33B are parts that are movably supported by the support shaft 50 and are respectively provided on both sides of each main body portion 32A and 33A in the X direction.

[0095] The lens included in the main body 32A of the second lens unit 32 corresponds to the "first movable lens" of the present invention. The lens included in the main body 33A of the third lens unit 33 corresponds to the "second movable lens" of the present invention.

[0096] The fourth lens unit 34 is disposed on the downstream side in the incident direction and is configured to include a lens. The fourth lens unit 34 is supported by a support shaft 50 at a position adjacent to the second wall 112 of the housing 10. Additionally, as... Figure 4 As shown, in this embodiment, a protrusion 34A is provided on the surface of the fourth lens unit 34 on the + side in the Y direction.

[0097] It should be noted that the lenses in the first to fourth lens units 31 to 34 can be assembled into the housing 10 either during the manufacturing of the lens drive device or during the manufacturing of the camera module 1 using the lens drive device.

[0098] The protrusion 34A is sized to engage with the opening 112D of the second wall 112. By engaging the protrusion 34A with the opening 112D, the fourth lens unit 34 is fixed to the housing 10.

[0099] like Figure 3 and Figure 5 As shown, the support shaft 50 is made of, for example, stainless steel. The support shaft 50 extends along the Y direction and is disposed in each region of a pair of third walls 113. In this embodiment, each support shaft 50 is configured to be of equal length and is supported by the support portion 113B of the third wall 113 and the support portions 112A of the second wall 112.

[0100] The lens driving unit 60 is respectively provided corresponding to the second lens unit 32 and the third lens unit 33, and under the control of the aforementioned driving control unit 100, it causes one of the corresponding second lens unit 32 and the third lens unit 33 to move independently. The lens driving unit 60 is disposed in the region of the fourth wall 114 on the + side in the X direction, surrounded by the first wall 111, the second wall 112, and the third wall 113. That is, as Figure 7 As shown, the lens drive unit 60 is disposed on one end of the housing 10, between the second lens unit 32 and the third lens unit 33, which sandwich the optical axis O.

[0101] In this embodiment, two lens driving units 60 are arranged side by side in the Y direction. The lens driving unit 60 on the - side in the Y direction drives the second lens unit 32 along the Y direction; the lens driving unit 60 on the + side in the Y direction drives the third lens unit 33 along the Y direction. That is, the lens driving unit 60 on the - side in the Y direction corresponds to the "first driving unit" of the present invention, and the lens driving unit 60 on the + side in the Y direction corresponds to the "second driving unit" of the present invention.

[0102] In this embodiment, each lens driving unit 60 has a substantially identical structure. Therefore, in the following description, unless otherwise stated, only the lens driving unit 60 corresponding to the second lens unit 32 will be described, and the description of the lens driving unit 60 corresponding to the third lens unit 33 will be omitted. Furthermore, in this embodiment, each lens driving unit 60 is symmetrically arranged in the Y direction. Therefore, the relationship between the + and - sides in the Y direction of the lens driving unit 60 corresponding to the third lens unit 33 is the opposite of the relationship between the + and - sides in the Y direction of the lens driving unit 60 corresponding to the second lens unit 32.

[0103] The lens drive unit 60 has a frame 61, a connecting part 62, a clamping part 63, an ultrasonic motor 64, and a guide part 80.

[0104] The frame 61 is connected to either the supported portions 32B or 33B of the second lens unit 32 and the third lens unit 33 via the connecting portion 62.

[0105] The frame 61 on the - side in the Y direction corresponds to the "first frame" of the present invention, and the frame 61 on the + side in the Y direction corresponds to the "second frame" of the present invention.

[0106] The frame 61 is configured to guide movement in the direction of the optical axis O (Y direction) via the guide portion 80, and can move in the direction of the optical axis O. If the frame 61 moves in the direction of the optical axis O, the second lens unit 32 or the third lens unit 33 connected to the frame 61 by means of the connecting portion 62 also moves along the support axis 50.

[0107] like Figure 8 and Figure 9 As shown, the frame 61 has a guided portion 611 and a magnet holding portion 612. The guided portion 611 is the part that is guided by the guided portion 80 to move along the Y direction of the frame 61, and is provided in the X direction at a position corresponding to the guided portion 80. The guided portion 611 has a first portion 611A, a second portion 611B, a third portion 611C, and a fourth portion 611D.

[0108] The first part 611A is the portion constituting the top surface (the surface on the + side in the Z direction) of the frame 61, configured to extend in the direction of the optical axis (Y direction). The first part 611A is configured to cover the guide portion 80 from the + side in the Z direction.

[0109] Additionally, a connecting portion 62 is provided on the surface of the first part 611A on the + side in the Z direction. For example... Figure 10As shown, the connecting part 62 is a plate-shaped spring member (elastic member) fixed to the following parts: the + side surface of the frame 61 in the Z direction and the - side surface in the Y direction of either the supported parts 32B or 33B of the second lens unit 32 or the third lens unit 33. By making the connecting part 62 a spring member, even if the positional relationship between the frame 61 and the supported parts 32B or 33B deviates due to manufacturing tolerances, the elastic force of the spring member can absorb the deviation in positional relationship.

[0110] like Figures 8-10 As shown, the second part 611B is the part that extends from the end of the first part 611A in the Y direction (one end of the first part 611A) to the Z direction (prescribed direction) and supports the first guide shaft 81 and the second guide shaft 82.

[0111] A shaft hole 611E extending along the Y direction is formed in the second part 611B. The shaft hole 611E is provided at a position corresponding to the first guide shaft 81 described later, and allows the first guide shaft 81 to pass through.

[0112] Additionally, a shaft engaging portion 611F is formed at the - side end in the Z direction of the second part 611B. The shaft engaging portion 611F is provided at a position where it can engage with the second guide shaft 82 described later, and engages with the second guide shaft 82 from the + side in the Z direction.

[0113] The third part 611C extends from the end of the first part 611A on the + side in the Y direction (the other end of the first part 611A) toward the - side in the Z direction and supports the second guide shaft 82. More specifically, the end of the third part 611C extending to the - side in the Z direction is spaced apart from the second guide shaft 82 at a predetermined interval.

[0114] A shaft hole 611G extending along the Y direction is formed in the third part 611C. The shaft hole 611G is located at a position corresponding to the first guide shaft 81 and allows the first guide shaft 81 to pass through.

[0115] The fourth portion 611D is a portion that extends from the end of the first portion 611A in the X direction on the + side. The fourth portion 611D is disposed throughout the first portion 611A in the Y direction and is configured to cover the guide portion 80 from the + side in the X direction.

[0116] Furthermore, an absorption section 613 is provided between the fourth part 611D and the guide section 80 (second guide shaft 82). The absorption section 613 is composed of a spring component and is disposed between the fourth part 611D and the second guide shaft 82. The absorption section 613 applies a force to the second guide shaft 82 relative to the fourth part 611D in the X direction. As a result, the absorption section 613 absorbs any deviation in the positional relationship between the frame 61 and the guide section 80.

[0117] like Figure 10 and Figure 11 As shown, the magnet holding part 612 is a part of the magnet part 614 for holding position detection, and extends from the end of the fourth part 611D in the Z direction to the X direction.

[0118] A recess 612A is formed at one end of the magnet holding portion 612 in the Z direction, and the magnet portion 614 is held within the recess. Additionally, a position detection portion 70 is provided in the housing 10 opposite to the magnet portion 614. The position detection portion 70 is a magnetoresistive sensor that detects the position of the frame 61 in the Y direction (direction of the optical axis) by detecting the magnetic field in a plane including the X and Y directions. Details regarding the magnet portion 614 and the position detection by the position detection portion 70 will be described later.

[0119] In addition, such as Figure 10 and Figure 11 As shown, a clamping part 63 is provided above the magnet holding part 612. The clamping part 63 has a first clamping member 631 and a second clamping member 632.

[0120] The first clamping member 631 is, for example, made of a flat metal component and is bonded to the surface of the fourth part 611D of the frame 61 in the X direction on the + side. Two protrusions D1 and D2 are provided on the surface of the fourth part 611D in the X direction on the + side.

[0121] Two protrusions, D1 and D2, protrude from the surface of the fourth portion 611D and are arranged side by side in the Y direction. In this embodiment, protrusion D1 is located near the central portion in the Y direction of the fourth portion 611D, and protrusion D2 is located near the end of the fourth portion 611D on the + side in the Y direction.

[0122] The first clamping member 631 is arranged parallel to the direction of the optical axis (Y direction) and has engagement holes 631A and 631B that engage with the two protrusions D1 and D2.

[0123] The engaging hole 631A is located near the center of the first clamping member 631 in the Y direction and engages with the protrusion D1. The engaging hole 631A is sized such that it can engage with the protrusion D1 and allows the clamping member 63 (first clamping member 631) to rotate around the engaging hole 631A engaged with the protrusion D1.

[0124] The engaging hole 631B is located near the end of the first clamping member 631 on the + side in the Y direction and engages with the protrusion D2. The engaging hole 631B is formed to be sized such that it can engage with the protrusion D2 and has a spacing that allows the inner edge of the engaging hole 631B to move relative to the protrusion D2 (see reference). Figure 12B ).

[0125] like Figure 12A and Figure 12B As shown, by forming the engagement holes 631A and 631B in this way, the clamping part 63 can rotate within the range of the engagement hole 631B with the engagement hole 631A (protrusion D1) as the center. As a result, the posture of the clamping part 63 can be adjusted so that the contact part 632B of the clamping part 63 is parallel to the guide shaft.

[0126] like Figure 11 As shown, the second clamping member 632 is, for example, made of a plate-shaped metal component, and is bonded to the first clamping member 631. The second clamping member 632 has a main body portion 632A and a contact portion 632B.

[0127] The main body 632A is a portion having a plane parallel to the direction of the optical axis (Y direction) and being bonded and fixed to the first clamping member 631. Holes A1 and A2 are formed on the main body 632A for the passage of two protrusions D1 and D2 of the fourth part 611D in the frame 61.

[0128] The contact portion 632B is the part that the vibrator of the ultrasonic motor 64 contacts, and is constructed by bending the ends of both sides of the main body portion 632A in the Z direction toward the side opposite to the lens portion. Thus, the main body portion 632A connecting the pair of contact portions 632B is arranged to cover the ultrasonic motor 64 from the X direction side, and the contact portions 632B are arranged to clamp the ultrasonic motor 64 (resonance portion 641).

[0129] By configuring the clamping part 63 in this way, force is applied from the vibrator of the ultrasonic motor 64 to the contact part 632B, thereby generating a thrust in the clamping part 63 in the direction of the optical axis (Y direction). As a result, a thrust can be imparted from the clamping part 63 to the frame 61, causing the frame 61 to move along the direction of the optical axis (Y direction).

[0130] In addition, such as Figure 13 As shown, a plurality of openings C1, C2, C3, and C4 are formed in the connection portion 632C between the main body portion 632A and the contact portion 632B. The plurality of openings C1, C2, C3, and C4 are arranged side by side along the Y direction on both sides of the connection portion, with four openings on each side.

[0131] Of the four openings C1, C2, C3, and C4, the two openings C2 and C3 on the central side in the Y direction are configured such that, compared to the two openings C1 and C4 on both ends in the Y direction, the length in the Y direction is longer and the length in the Z direction is also longer.

[0132] Furthermore, in the connecting portion 632C, five connecting portions 632D are formed by creating four openings C1, C2, C3, and C4, which are spaced apart and arranged side by side in the direction of the optical axis.

[0133] In this embodiment, the width of each connecting portion 632D in the Y direction (direction of the optical axis) is wider the connecting portion 632D located further outward from the center in the Y direction. Specifically, the connecting portion 632D at the very center in the Y direction is the narrowest among the five connecting portions 632D. The connecting portions 632D at both ends in the Y direction are the widest among the five connecting portions 632D. The width of the connecting portion 632D between the central connecting portion 632D and the connecting portions 632D at both ends is wider than the width of the central connecting portion 632D, but narrower than the width of the connecting portions 632D at both ends.

[0134] For the connecting part 632D (connecting part 632C), the strength is weaker closer to the end. Therefore, in this embodiment, the strength of the connecting part 632C is adjusted by changing the size of the openings C1, C2, C3, and C4 at the connecting part 632C and the width of the connecting part 632D.

[0135] By configuring it as described above, the pressing force applied by the oscillator 641B at each position of the contact portion 632B can be uniformly distributed in the Y direction. As a result, for example, when the stepless optical zoom function is activated in a device equipped with a smartphone or other portable terminal, the moving force of the clamping portion 63 can be stably generated even when the movable part moves within a relatively long range of motion.

[0136] like Figure 14 and Figure 15 As shown, the ultrasonic motor 64 is a drive source that generates the driving force for moving the frame 61, and its respective configuration part 111A (see reference) is fixedly disposed on the + side of the first wall 111 in the X direction. Figure 3 (etc.). The ultrasonic motor 64 has a resonant part 641, a piezoelectric element 642, a first electrode 643 and a second electrode 644.

[0137] The ultrasonic motor 64 on the - side in the Y direction corresponds to the "first ultrasonic motor" of the present invention, and the ultrasonic motor 64 on the + side in the Y direction corresponds to the "second ultrasonic motor" of the present invention.

[0138] The resonant portion 641, for example, is formed of a conductive material and resonates with the vibration of the piezoelectric element 642, converting this vibrational motion into linear motion of the frame 61. Specifically, based on the vibration of the piezoelectric element 642, the resonant portion 641 vibrates in an inclined direction relative to the optical axis (Y direction) and presses against the clamping portion 63, thereby generating a thrust on the frame 61 via the clamping portion 63 to move it along the optical axis. The resonant portion 641 is configured to be clamped between two contact portions 632B in the clamping portion 63. Figure 16 As shown, the resonant part 641 has a body 641A, two oscillators 641B, a protrusion 641C, and an energized part 641D.

[0139] The torso 641A is, for example, a generally rectangular portion held by a piezoelectric element 642. Two oscillators 641B extend from both ends of the torso 641A in the Z direction along the Y direction. The two oscillators 641B have symmetrical shapes, and their respective free ends contact the contact portions 632B of the clamping portion 63. The two oscillators 641B correspond to the "first oscillator" and "second oscillator" of the present invention.

[0140] The protrusion 641C extends from the central portion of the torso 641A in the Z direction toward the + side in the Y direction. The energized portion 641D extends from the central portion of the torso 641A in the Z direction toward the side opposite to the protrusion 641C (the - side in the Y direction).

[0141] The piezoelectric element 642 is, for example, a plate-shaped vibrating element made of ceramic material, which generates vibration by applying a high-frequency voltage. Two piezoelectric elements 642 are provided, each configured to clamp the body 641A of the resonant portion 641 in the X direction.

[0142] The first electrode 643 has a clamping portion 643A for clamping the resonant portion 641 and the piezoelectric element 642, and an electrode portion 643B for which a voltage is applied. The first electrode 643 applies a voltage to the piezoelectric element 642 via the clamping portion 643A. The second electrode 644 is electrically connected to the energized portion 641D of the resonant portion 641. The first electrode 643 and the second electrode 644 are in contact with the terminals of the terminal portion 111C described above on the inner side of the housing 10.

[0143] Two piezoelectric elements 642 are attached to the body 641A of the resonant portion 641 and held by the first electrode 643, thereby electrically connecting them to each other. For example, one side of the power supply path is connected to the first electrode 643 and the other side is connected to the second electrode 644, thereby applying a voltage to the piezoelectric elements 642 and generating vibration.

[0144] The resonant part 641 has at least two resonant frequencies and deforms with different actions relative to each resonant frequency. In other words, the overall shape of the resonant part 641 is set so that the resonant part 641 deforms with different actions relative to the two resonant frequencies. The different actions refer to the actions of moving the frame 61 towards the + side in the Y direction through the clamping part 63 and the actions of moving the frame 61 towards the - side in the Y direction through the clamping part 63.

[0145] like Figure 17 As shown, the resonant part 641 is configured such that one of the pair of contact parts 632B of the clamping part 63 is opposite to the oscillator 641B. Therefore, when the two oscillators 641B deform, the front end of the oscillator 641B presses the contact part 632B from the side opposite to it in a direction inclined relative to the Y direction (refer to arrow A).

[0146] When each contact portion 632B is pressed in the direction of arrow A by the front end of the oscillator 641B, a reaction force is generated at each contact portion 632B to return towards the oscillator 641B. In other words, the clamping portion 63 generates a reaction force from the outside of the pair of contact portions 632B toward the inside based on the contact between each oscillator 641B and the pair of contact portions 632B.

[0147] Due to the reaction force generated between the oscillator 641B and the contact portion 632B caused by the pressing action of the clamping portion 63 relative to the oscillator 641B, a thrust is generated in the clamping portion 63 in the Y direction. Accompanying this, a thrust is applied to the frame 61 bonded to the clamping portion 63, causing it to move in the Y direction (see arrow B). As a result, the second lens unit 32 or the third lens unit 33 connected to the frame 61 moves in the Y direction.

[0148] Furthermore, since the contact portion 632B is configured to extend along the Y direction, it slides against the oscillator 641B and moves in the Y direction by being pressed by the oscillator 641B. Therefore, the continuous pressing of the contact portion 632B by the oscillator 641B allows the frame 61, which is bonded to the clamping portion 63, to move continuously in the Y direction. It should be noted that at a certain resonant frequency, the pressing direction of the oscillator 641B is in the direction of arrow A, and the sliding direction of the contact portion 632B is in the direction of arrow B. Conversely, at another resonant frequency, the pressing direction of the oscillator 641B is in the direction of arrow C, and the sliding direction of the contact portion 632B is in the direction of arrow D.

[0149] This driving action is performed by each of the ultrasonic motors 64 provided on each of the first walls 111 on both sides in the X direction. That is, each ultrasonic motor 64 independently drives the second lens unit 32 and the third lens unit 33 along the optical axis.

[0150] like Figure 18 As shown, these movements are guided by the guide portion 80. The guide portion 80 is disposed on the + side in the X direction, in the region of the fourth wall 114 surrounded by the first wall 111, the second wall 112, and the third wall 113. That is, the guide portion 80 is disposed on one end of the housing 10, between the second lens unit 32 and the third lens unit 33, which is located at the two ends that sandwich the optical axis O (see also...). Figure 7 ).

[0151] The guide section 80 has a first guide shaft 81 and a second guide shaft 82, both extending in the direction of the optical axis (Y direction) and spaced apart from each other. The first guide shaft 81 and the second guide shaft 82 cooperate to support both frames 61 in a manner that allows them to move along the optical axis. The first guide shaft 81 and the second guide shaft 82 are made of, for example, stainless steel and are supported by guide supports (not shown) at the two ends of the optical axis (the two ends in the X direction) of the housing 10, specifically at the second wall 112 and the third wall 113. The second wall 112 and the third wall 113 correspond to a pair of walls extending from the bottom wall (fourth wall 114) of the invention.

[0152] The first guide shaft 81 is a guide shaft that guides the movement of the frame 61 by supporting the second part 611B and the third part 611C of the guided part 611 in the frame 61.

[0153] The second guide shaft 82 is arranged parallel to the first guide shaft 81 at a position further in the Z direction than the first guide shaft 81 (the side of the fourth wall 114), and guides the movement of the frame 61 by supporting the second part 611B of the guided part 611 in the (engaging) frame 61. Furthermore, the first guide shaft 81 and the second guide shaft 82 are arranged in a position in the X direction that is approximately the same as the aforementioned support shaft 50 (see reference). Figure 10 In this way, by setting two guide shafts, the first guide shaft 81 and the second guide shaft 82, which guide the movement of the lens drive unit 60, the strength of the housing 10 can be improved.

[0154] The second guide shaft 82 is supported by a bearing portion 114A disposed on the fourth wall 114. The bearing portion 114A is positioned between the two frames 61, protruding from the fourth wall 114 in the Z direction towards the + side, and is disposed in a region near the center of the second guide shaft 82 in the Y direction. The second guide shaft 82 is bonded and fixed to the bearing portion 114A. Furthermore, the bearing portion 114A is disposed in the X direction (between the two ends of the optical axis) within a region including the center 82A of the second guide shaft 82 (see reference). Figure 10 ).

[0155] Furthermore, the bearing portion 114A is positioned to contact the second portion 611B of the frame 61. Therefore, when the frame 61 moves towards the + side in the Y direction, the second portion 611B of the frame 61 contacts the bearing portion 114A (see reference). Figure 19 Therefore, the bearing section 114A restricts the movement of the frame 61.

[0156] Next, the details of the magnet part 614 will be explained.

[0157] like Figure 20 As shown, the magnet section 614 has a first magnetic pole 614A and a second magnetic pole 614B arranged adjacent to each other in the X direction (a width direction orthogonal to the Y direction) with a boundary 614D between them. The first magnetic pole 614A is an N-pole magnet, and the second magnetic pole 614B is an S-pole magnet. That is, the first magnetic pole 614A and the second magnetic pole 614B are magnetized in the direction opposite to the position detection section 70 (the Z direction in this embodiment) and in a manner opposite to the position detection section 70.

[0158] The first magnetic pole 614A and the second magnetic pole 614B are arranged in contact with each other. Therefore, on the opposing surface 614C of the magnet section 614, which is opposite to the position detection section 70, the N pole and the S pole are arranged adjacent to each other.

[0159] With the first magnetic pole 614A in contact with the second magnetic pole 614B, the opposing surface 614C of the magnet portion 614, which faces the position detection unit 70, is configured as a rectangle extending along the Y direction. In other words, the magnet portion 614 extends linearly along the Y direction with a constant width.

[0160] The adjacent surface of the first magnetic pole 614A to the second magnetic pole 614B is configured such that the central portion in the Y direction protrudes further toward the second magnetic pole 614B than the two ends in the Y direction.

[0161] The adjacent surface of the second magnetic pole 614B to the first magnetic pole 614A is configured such that the central portion in the Y direction is more recessed than the two ends in the Y direction, in a manner that follows the shape of the adjacent surface of the first magnetic pole 614A.

[0162] That is, the boundary 614D between the first magnetic pole 614A and the second magnetic pole 614B extends in a curved (arc-shaped) manner, with the angle to the Y direction continuously changing. Specifically, the boundary 614D extends in a curved manner such that, in the magnet portion 614, as the end on the - side in the Y direction approaches a predetermined position, it shifts from the first magnetic pole 614A side to the second magnetic pole 614B side in the X direction, and, in the magnet portion 614, as the end on the + side in the Y direction approaches from the predetermined position, it shifts from the second magnetic pole 614B side to the first magnetic pole 614A side in the X direction. Thus, the ratio of the width of the first magnetic pole 614A to the width of the second magnetic pole 614B varies corresponding to the curved boundary 614D. More specifically, in the Y direction, the ratio of the first magnetic pole 614A in the first magnetic pole 614A to the second magnetic pole 614B increases as the end on the - side in the Y direction in the magnet portion 614 approaches the predetermined position. Furthermore, the proportion of the first magnetic pole 614A decreases as it moves closer to the end of the magnet portion 614 in the Y direction from a predetermined position toward the + side.

[0163] The designated position is, for example, the center of the magnet portion 614 in the Y direction. Furthermore, the X-direction positions of the two ends of the first magnetic pole 614A and the second magnetic pole 614B in the Y direction are the same.

[0164] In other words, the first magnetic pole 614A and the second magnetic pole 614B are symmetrically arranged on the + side and - side in the Y direction.

[0165] With this configuration, the distribution of magnetic force in the magnet section 614 can be made symmetrical on the + and - sides with reference to the central portion in the Y direction. Therefore, the magnetic flux density of the magnet section 614 detected by the position detection unit 70 can vary depending on the position of the frame 61 (see, for example, reference...). Figure 22 In other words, the boundary 614D between the first magnetic pole 614A and the second magnetic pole 614B extends in a curved manner to form a magnetic field in which the direction of the magnetic flux at the opposing portion of the magnet portion 614 opposite to the position detection portion 70 changes as the magnet portion 614 moves.

[0166] Next, the position detection performed by the position detection unit 70 will be explained.

[0167] like Figure 21A , Figure 21B and Figure 21C As shown, the position detection unit 70 can detect the change in magnetic field (magnetic flux density) generated by the ratio of the N pole to the S pole at the opposite part of the magnet 614 in relation to the movement of the frame 61 in the Y direction.

[0168] For example, in such Figure 21AWhen the frame 61 shown is positioned at its closest point in the Y direction, the position detection unit 70 is opposite the positive end of the magnet 614 in the Y direction. The position detection unit 70 is opposite the larger portion of the first magnetic pole 614A, which is the N pole at that end.

[0169] like Figure 21B As shown, if the frame 61 moves towards the + side in the Y direction, the magnet 614 also moves with the frame 61, thus changing the opposing portion in the magnet 614 of the position detection unit 70. The proportion of the first magnetic pole 614A increases as the magnet 614 moves closer to the center in the Y direction, therefore, the proportion of the first magnetic pole 614A at the opposing portion opposite to the position detection unit 70 gradually increases.

[0170] When the frame 61 moves to a position where the position detection unit 70 is opposite the central part of the frame 61, the part with the largest proportion of the first magnetic pole 614A (N pole) becomes the opposite part opposite to the position detection unit 70.

[0171] Moreover, such as Figure 21C As shown, when the frame 61 moves from a position opposite to the central portion of the position detection unit 70 to a position opposite to the end of the position detection unit 70 on the Y-direction side of the magnet portion 614, the proportion of the first magnetic pole 614A at the opposing portion opposite to the position detection unit 70 decreases, and the proportion of the second magnetic pole 614B increases.

[0172] The position detection unit 70 detects the magnetic flux density at various positions in the Y direction within the magnet unit 614. The change in magnetic flux density detected by the position detection unit 70 at this time is, for example,... Figure 22 The changes shown.

[0173] Specifically, as the frame 61 moves towards the + side in the Y direction, the magnetic flux density increases sharply from B1 (which is closer to the - side than 0) to B2 (which is closer to the + side than 0), and then gradually decreases to B3 (which is closer to the - side than 0). Moreover, the magnetic flux density increases sharply from B3 to B4 (which is closer to the + side than 0).

[0174] For example, by setting the values ​​of the magnetic flux density in a range with a roughly constant slope, such as the range from B2 to B3, to various positions in the Y direction, it is possible to distribute the magnetic flux density corresponding to each position of the frame 61 in the Y direction at roughly equal intervals. As a result, it is possible to accurately detect changes in the position of the frame 61 (magnet part 614) in the Y direction.

[0175] That is, in this embodiment, the magnetic flux density detected by the position detection unit 70 can be different for each position of the frame 61, so the position of the frame 61 in the Y direction can be detected with good accuracy by the position detection unit 70.

[0176] Furthermore, the position detection unit 70 is a magnetoresistive sensor, thus enabling it to detect the magnetic force in the horizontal direction (X and Y directions) of the magnet unit 614. For example, if the position detection unit is a Hall element, it detects the magnetic force in the vertical direction (Z direction) of the magnet unit. Therefore, for example, if the position of the magnet unit deviates in the X direction due to assembly errors, the magnet unit may move out of the detection range of the position detection unit, making it impossible to detect the magnetic force, and consequently, accurate position detection of the frame (movable lens) may not be possible.

[0177] In contrast, in this embodiment, the position detection unit 70 is a magnetoresistive sensor, which expands the detection range of magnetic force in the horizontal direction compared to a position detection unit using a Hall element. As a result, even if the position of the magnet 614 deviates in the X direction due to assembly errors, the magnetic force in the magnet 614 can be detected, thereby enabling accurate position detection of the frame 61 (movable lens).

[0178] Furthermore, the first magnetic pole 614A and the second magnetic pole 614B of the magnet section 614 are symmetrically shaped on the + and - sides in the Y direction, thus enabling the magnetic force distribution to be symmetrical accordingly. As a result, the slope of the change in magnetic flux density in the position detection section 70 can be kept approximately constant (e.g., from...). Figure 22 Between B2 and B3), the magnetic flux density at each position in the Y direction can be kept approximately constant. As a result, the magnetic flux density can be distributed at equal intervals at each position in the Y direction, and therefore, the position of the frame 61 (movable lens) in the Y direction can be detected accurately by the position detection unit 70.

[0179] It should be noted that in the above embodiment, the adjacent surfaces of the first magnetic pole 614A and the second magnetic pole 614B are formed in an arc shape, but the present invention is not limited thereto. For example, as Figure 23 As shown, the adjacent surfaces of the first magnetic pole 614A and the second magnetic pole 614B can also be configured as a triangular shape.

[0180] In addition, such as Figure 24 As shown, the adjacent surfaces of the first magnetic pole 614A and the second magnetic pole 614B can also be configured as a stepped shape.

[0181] Furthermore, in the above embodiment, the first magnetic pole 614A and the second magnetic pole 614B are symmetrical on both sides in the Y direction, but the present invention is not limited to this, for example, as Figure 25As shown, the first magnetic pole 614A and the second magnetic pole 614B may not be symmetrical on both sides in the Y direction.

[0182] Figure 25 The diagram shows a case where the adjacent surfaces of the first magnetic pole 614A and the second magnetic pole 614B are triangular. The vertex position (prescribed position) of the adjacent surface of the first magnetic pole 614A is located offset towards the + side in the Y direction from the center of the magnet portion 614 in the Y direction. Furthermore, as... Figure 26 As shown, the vertex position (prescribed position) of the adjacent surface of the first magnetic pole 614A can also be located in the center of the Y direction, and the two ends of the adjacent surface of the first magnetic pole 614A in the Y direction are located in different positions in the X direction.

[0183] Furthermore, in the above embodiment, the position detection unit 70 detects the magnetic flux density of the magnet unit 614, but the present invention is not limited thereto. For example, the position detection unit 70 may also detect the rotation angle of the magnet unit 614 around the Z direction.

[0184] Furthermore, in the above embodiment, a position detection unit 70 is provided for each frame 61, but the present invention is not limited thereto. For example, such as Figure 27 As shown, the structure can also have multiple position detection units 70 arranged side by side in the direction of the optical axis (Y direction). With this configuration, the accuracy of position detection of the frame 61 can be further improved.

[0185] Furthermore, in the above embodiment, the position detection unit 70 is a magnetoresistive sensor, but the present invention is not limited to this. Any component can be used as long as it can detect the magnetic field in the surface including the X and Y directions.

[0186] Furthermore, in the above embodiment, it is configured to have two guide shafts, but the present invention is not limited to this. For example, it may be configured to have three or more guide shafts, or it may be configured to have one guide shaft.

[0187] In addition, in the above embodiment, the support shaft 50 is provided on both sides in the X direction, but the present invention is not limited to this, and the support shaft 50 may be provided only on one side in the X direction.

[0188] In addition, in the above embodiment, the side wall portion 11 and the bottom wall portion 12 in the housing 10 are formed by insert molding, but the present invention is not limited to this, and the bottom wall portion can also be bonded and fixed to the side wall portion 11.

[0189] Furthermore, in the above embodiment, it is configured to have two movable lenses consisting of a second lens unit 32 and a third lens unit 33. However, the present invention is not limited to this and may also be configured to have three or more movable lenses, or may be configured to have one movable lens.

[0190] Furthermore, in the above embodiment, four lens units are configured, but the present invention is not limited to this; any number of lens units can be provided as long as at least one movable lens is included. Additionally, in the case of a single movable lens, there is also a single lens drive unit.

[0191] In addition, in the above embodiment, a plate-shaped metal part is bent to form the clamping part 63, but the present invention is not limited to this. The main body and the contact part that form the clamping part can also be formed by separate parts.

[0192] Furthermore, in the above embodiment, the frame 61 and the clamping part 63 are composed of different components, but the present invention is not limited thereto. For example, the frame 61 and the clamping part 63 may also be integrally formed. That is, the lens driving part may also have a moving part, which is connected to each of the lens units in such a way that it moves in the direction of the optical axis following the resonance of the resonant part and transmits the movement in the direction of the optical axis.

[0193] Furthermore, in the above embodiment, the connection portion 62 between the connecting frame 61 and the lens unit is composed of a spring component, but the present invention is not limited to this, and any component can be used as long as it is elastic.

[0194] In addition, in the above embodiment, the third part 611C of the frame 61 is arranged at a distance from the second guide shaft 82, but the present invention is not limited to this, and the third part may also support the second guide shaft.

[0195] Furthermore, the above embodiment employs a structure with a bent portion and a semi-punched hole in the bottom wall portion, but the present invention is not limited to this, and may also have a structure without a bent portion and a semi-punched hole.

[0196] Furthermore, the above embodiment employs a structure in which the resonant part 641 has two oscillators 641B, but the present invention is not limited thereto; for example, it may also have a structure with one oscillator.

[0197] Furthermore, in the above embodiments, a drive control unit, a reflection drive control unit, and a camera control unit are respectively provided, but the present invention is not limited thereto, and at least two of the drive control unit, the reflection drive control unit, and the camera control unit may also be constituted by a single control unit.

[0198] In addition, the bearing portion 114A is provided in the above embodiment, but the present invention is not limited thereto, and the bearing portion may not be provided.

[0199] In addition, the above embodiment includes an absorption section 613, but the present invention is not limited thereto, and the absorption section may not be provided.

[0200] Furthermore, for example, in the above embodiment, a smartphone as a portable terminal with a camera module 1 was described as an example of a camera-mounted device, but the present invention can be applied to a camera-mounted device having a camera module and an image processing unit that processes image information obtained by the camera module. The camera-mounted device includes information devices and transportation devices. Information devices include, for example, portable telephones with cameras, laptops, tablet terminals, portable game consoles, webcams, drones, and vehicle-mounted devices with cameras (e.g., rear-view cameras, dashcams). Transportation devices include, for example, automobiles and drones.

[0201] Figure 29A , Figure 29B This diagram represents a car V, which is a camera mounting device equipped with a vehicle camera module VC (Vehicle Camera). Figure 29A This is the front view of car V. Figure 29B This is a rear perspective view of vehicle V. Vehicle V is equipped with camera module 1 as described in the embodiment, serving as an in-vehicle camera module VC. Figure 29A and Figure 29B As shown, the vehicle-mounted camera module VC is mounted, for example, facing forward on the windshield or facing backward on the tailgate. This vehicle-mounted camera module VC is used as a vehicle-mounted camera module for rear monitoring, dashcams, collision avoidance control, autonomous driving control, etc.

[0202] Furthermore, the above embodiments are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be limited by these embodiments. That is, the present invention can be implemented in various forms without departing from its essential points or main features. For example, the shape, size, quantity, and material of the various parts described in the above embodiments are merely examples and can be appropriately modified for implementation.

[0203] The entire contents of the description, drawings and abstract of the description included in U.S. Provisional Patent Application No. 63 / 002,300, filed on March 30, 2020, are incorporated herein by reference.

[0204] Industrial applicability

[0205] The lens driving device of the present invention is useful as a lens driving device, camera module, and camera mounting device capable of accurately detecting the position of a movable lens.

[0206] 1. Camera Module

[0207] 10. Shell

[0208] 11. Side wall portion

[0209] 12 Bottom wall

[0210] 20 Reflection Drive Unit

[0211] 21 Reflective housing

[0212] 22 Reflectors

[0213] 23 Reflection Drive Control Unit

[0214] 30 Lens section

[0215] 31 First Lens Unit

[0216] 32 Second Lens Unit

[0217] 32A Main Body

[0218] 32B Supported Part

[0219] 33 Third Lens Unit

[0220] 33A Main Body

[0221] 33B Supported section

[0222] 34 Fourth Lens Unit

[0223] 34A convex part

[0224] 40. Camera Department

[0225] 50 Support Shaft

[0226] 60 Lens drive unit

[0227] 61 Framework

[0228] 62 Connecting part

[0229] 63. Clamping section

[0230] 64 Ultrasonic Motor

[0231] 70 Position Detection Department

[0232] 80 Guiding Department

[0233] 81 First Guide Shaft

[0234] 82 Second Guide Shaft

[0235] 100 Drive Control Unit

[0236] 111 First Wall

[0237] 111A Configuration Department

[0238] 111B is stuck in the middle.

[0239] 111C Terminal Section

[0240] 112 Second Wall

[0241] 112A Support Section

[0242] 112B Configuration Department

[0243] 112C Guide Support Unit

[0244] 112D opening

[0245] 113 Third Wall

[0246] 113A Bridge Connector

[0247] 113B Support Section

[0248] 113C Guide Support Unit

[0249] 114 Fourth Wall

[0250] 114A Bearing Section

[0251] 121 Positioning Department

[0252] 122 Bending section

[0253] 123 Semi-punching

[0254] 200 Camera Control Department

[0255] 611 Guided Department

[0256] 611A Part 1

[0257] 611B Part 2

[0258] 611C Part 3

[0259] 611D Part Four

[0260] 612 Magnet Holding Part

[0261] 613 Absorption Section

[0262] 614 Magnet Section

[0263] 614A First Magnetic Pole

[0264] 614B Second Magnetic Pole

[0265] 614C Opposite Surface

[0266] 614D boundary

[0267] 631 First clamping component

[0268] 631A locking hole

[0269] 631B locking hole

[0270] 632 Second clamping component

[0271] 632A Main Body

[0272] 632B Contact Section

[0273] 632C Connection Section

[0274] 632D Connector

[0275] 641 Resonance section

[0276] 641A Torso

[0277] 641B Oscillator

[0278] 641C Protrusion

[0279] 641D Power Supply Section

[0280] 642 Piezoelectric element

[0281] 643 First Electrode

[0282] 643A Clamping Part

[0283] 643B Electrode Section

[0284] 644 Second Electrode

Claims

1. A lens driving device, comprising: The movable part is able to hold the movable lens in place; The driving unit drives the movable part along the direction of the optical axis; A magnet portion is disposed on the movable portion and extends along the direction of the optical axis, and has a first magnetic pole and a second magnetic pole arranged adjacent to each other at a boundary in a width direction orthogonal to the direction of the optical axis; as well as A position detection unit, disposed opposite to the magnet unit, detects the position of the magnet unit by detecting the magnetic field in a surface including the direction of the optical axis and the width direction. The position detection unit includes a magnetoresistive sensor. The boundary extends in a curved manner, with the angle between the boundary and the direction of the optical axis varying.

2. The lens driving device as claimed in claim 1, wherein, The boundary extends in a curved manner, such that, in the magnet portion, as the end on one side in the direction of the optical axis approaches a predetermined position in the direction of the optical axis, it shifts from the side where the first magnetic pole is located to the side where the second magnetic pole is located in the width direction, and in the magnet portion, as the end on the other side in the direction of the optical axis approaches from the predetermined position, it shifts from the side where the second magnetic pole is located to the side where the first magnetic pole is located in the width direction.

3. The lens driving device as described in claim 1, wherein, The boundary extends in a curved manner, with the angle between the boundary and the direction of the optical axis changing continuously.

4. The lens driving device as claimed in claim 1, wherein, The boundary extends in a curved manner to form a magnetic field in which the direction of the magnetic flux at the opposing portion of the magnet, which is opposite to the position detection unit, changes as the magnet moves.

5. The lens driving device as claimed in claim 1, wherein, The boundary extends in a curved arc.

6. The lens driving device as claimed in claim 1, wherein, The magnet portion extends in a straight line along the direction of the optical axis with a constant width. The ratio of the width of the first magnetic pole to the width of the second magnetic pole varies corresponding to the curved extension of the boundary.

7. The lens driving device as claimed in claim 1, wherein, The position detection unit includes multiple magnetoresistive sensors arranged side by side along the direction of the optical axis.

8. The lens driving device as claimed in claim 1, wherein, The movable part has a first movable part and a second movable part, which are respectively capable of holding the first movable lens and the second movable lens. The driving unit has a first driving unit and a second driving unit, which drive the first movable part and the second movable part respectively along the direction of the optical axis. The first driving unit and the second driving unit are both disposed at one end, which refers to one of the two ends of the first movable part and the second movable part that sandwich the optical axis. Both the first movable part and the second movable part are provided with the magnet part.

9. The lens driving device as claimed in claim 8, wherein, The first driving part has a first ultrasonic motor and a first frame connected to the first movable part. The second drive unit has a second ultrasonic motor and a second frame connected to the second movable unit. The first ultrasonic motor and the second ultrasonic motor are arranged side by side on one end side along the direction of the optical axis, and drive the first movable part and the second movable part independently along the direction of the optical axis, respectively.

10. A camera module comprising: The lens driving device according to claim 1; The lens portion includes the movable lens held in the movable portion; and The camera unit captures an image of the subject formed through the lens unit. The camera module drives the movable lens along the direction of the optical axis.

11. A camera mounting device, which is an information device or a transport device, and comprises: The camera module of claim 10; and The camera control unit processes the image information obtained by the camera module.

Images