阅读说明：本技术 透镜驱动装置、摄像机模块及摄像机搭载装置 (Lens driving device, camera module, and camera mounting device ) 是由 泷本征宏 于 2021-04-27 设计创作，主要内容包括：本发明涉及透镜驱动装置、摄像机模块及摄像机搭载装置。透镜驱动装置是通过第一可动部受到驱动部的驱动力而在光轴正交面内移动从而进行抖动修正的透镜驱动装置,其中,支撑部由在光轴方向上延伸的吊线构成,该透镜驱动装置具备：XY方向移动限制部,以使光轴正交面内的彼此正交的X方向及Y方向上的第一可动部的可移动行程收敛于第一移动行程L1的范围内的方式,限制第一可动部的移动；以及中间方向移动限制部,以使与X方向及Y方向呈45°的方向即中间方向上的第一可动部的可移动行程收敛于第二移动行程L2的范围内的方式,限制第一可动部的移动,第二移动行程L2满足其中,是表示平方根的数学符号。(The invention relates to a lens driving device, a camera module and a camera mounting device. The lens driving device is a lens driving device which performs shake correction by the first movable part moving in a plane orthogonal to the optical axis by receiving the driving force of the driving part, wherein the supporting part is composed of a suspension wire extending in the optical axis direction, and the lens driving deviceThe disclosed device is provided with: an XY-direction movement restricting unit that restricts movement of the first movable unit so that a movable stroke of the first movable unit in an X direction and a Y direction orthogonal to each other within the optical axis orthogonal plane is within a range of a first movement stroke L1; and an intermediate direction movement limiting part which limits the movement of the first movable part in a mode that the movable stroke of the first movable part in the intermediate direction which is a direction forming 45 degrees with the X direction and the Y direction is converged within the range of a second movement stroke L2, wherein the second movement stroke L2 satisfies the requirement of Wherein the content of the first and second substances, is a mathematical notation that represents a square root.)

1. A lens driving device includes:

a first fixed part;

a first movable portion arranged at a distance in the optical axis direction with respect to the first fixed portion;

a support portion connecting the first fixed portion and the first movable portion; and

a drive unit for moving the first movable unit,

the first movable part is moved in a plane orthogonal to the optical axis direction by the driving force of the driving part to perform the shake correction,

the support portion is formed of a suspension wire extending in the optical axis direction, and the lens driving device further includes:

an XY-direction movement restricting unit that restricts movement of the first movable unit so that a movable stroke of the first movable unit in an X direction and a Y direction orthogonal to each other within the optical axis orthogonal plane is within a range of a first movement stroke L1; and

an intermediate direction movement restricting unit that restricts movement of the first movable unit so that a movable stroke of the first movable unit in an intermediate direction, which is a direction at 45 ° to the X direction and the Y direction, is within a range of a second movement stroke L2,

the second movement stroke L2 is satisfiedWherein the content of the first and second substances,is a mathematical notation that represents a square root.

2. The lens driving device according to claim 1,

the lens driving device has a rectangular shape extending in the X direction and the Y direction in a plan view viewed from the optical axis direction,

the intermediate direction movement restricting portions are provided at positions corresponding to four corners of the rectangular shape.

3. The lens driving device according to claim 2,

the intermediate direction movement restricting section includes:

a fixed-side restricting section provided on the first fixed section so as to protrude toward the light-receiving side in the optical axis direction; and

a movable-side regulating section provided in the first movable section so as to be recessed more inward than an outer shape of the first movable section in a plan view,

the fixed-side restricting portion and the movable-side restricting portion each have a middle-direction facing surface facing each other in the middle direction.

4. The lens driving device according to claim 3,

the first movable portion has a second movable portion movable in the optical axis direction,

the fixed-side restricting part and the movable-side restricting part each have optical axis direction facing surfaces facing each other in the optical axis direction.

5. The lens driving device according to claim 1,

the first movement stroke L1 is the same as the second movement stroke L2.

6. A camera module includes:

the lens driving device of claim 1;

a lens unit attached to the first movable unit; and

and an imaging unit that images the subject image formed by the lens unit.

7. A camera-mounted device, which is an information device or a transportation device, is provided with:

the camera module of claim 6; and

and an image processing unit that processes the image information obtained by the camera module.

Technical Field

The invention relates to a lens driving device, a camera module and a camera mounting device.

Background

In general, a small camera module is mounted in a portable terminal such as a smartphone. Such a camera module is applied to a lens driving apparatus having an Auto Focus function (hereinafter, referred to as "AF function") for automatically performing Auto Focus when an object is photographed, and a shake correction function (hereinafter, referred to as "OIS function") for optically correcting shake (vibration) generated during photographing to reduce Image blur.

A lens driving device having an AF function and an OIS function includes: an autofocus drive unit (hereinafter referred to as "AF drive unit") for moving the lens unit in the optical axis direction, and a shake correction drive unit (hereinafter referred to as "OIS drive unit") for swinging the lens unit in an optical axis orthogonal plane orthogonal to the optical axis direction. In patent document 1, a Voice Coil Motor (VCM) is used for the AF driving unit and the OIS driving unit.

An autofocus movable portion (hereinafter referred to as "AF movable portion") that can move in the optical axis direction during autofocus is disposed, for example, at a distance in the radial direction from an autofocus fixing portion (hereinafter referred to as "AF fixing portion"). The shake correction movable portion (hereinafter referred to as "OIS movable portion") that oscillates in the plane orthogonal to the optical axis during shake correction is configured by an AF unit including an AF movable portion, an AF fixed portion, and an AF driving portion, and is disposed apart from the shake correction fixed portion (hereinafter referred to as "OIS fixed portion") in the optical axis direction, for example.

The OIS movable portion is connected to the OIS fixed portion by an OIS supporting portion such as a suspension wire, and is swingable in the plane orthogonal to the optical axis. In such a lens driving device, a guaranteed stroke is defined, which indicates a degree of shake correction that can be appropriately performed. Further, the strength of the suspension wire and the like are designed so that, at least when the OIS movable portion moves within the range where the stroke is secured, no trouble such as buckling occurs. Further, the movement of the OIS movable portion in the X direction and the Y direction orthogonal to each other is physically restricted by the fact that the OIS movable portion abuts against the cover or the like.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2013-210550

Disclosure of Invention

Problems to be solved by the invention

However, if only the movement of the OIS movable portion in the X direction and the Y direction is restricted as in the related art, the movable stroke (physical movable stroke) in the intermediate direction, which is a direction at 45 ° to the X direction and the Y direction, is the movable stroke (for example, the same as the guaranteed stroke) in the X direction and the Y directionIn which ""is a mathematical symbol indicating a square root, and the same applies to the following description. That is, the OIS movable portion can move beyond the guaranteed stroke in the neutral direction.

Therefore, when the suspension wire is designed based on the guaranteed stroke, a load exceeding the assumed load is applied to the suspension wire due to the movement of the OIS movable portion in the intermediate direction, which may cause a problem such as buckling. On the other hand, when the suspension wire is designed in consideration of the movable stroke of the OIS movable portion in the intermediate direction, there is a possibility that the reduction in size and weight of the lens driving device is hindered due to an increase in the wire diameter or the like.

The invention aims to provide a lens driving device, a camera module and a camera mounting device which can inhibit the suspension wire from applying load beyond the assumption and improve the reliability.

Means for solving the problems

The lens driving device of the present invention comprises:

a first fixed part;

a first movable portion arranged at a distance in the optical axis direction with respect to the first fixed portion;

a support portion connecting the first fixed portion and the first movable portion; and

a drive unit for moving the first movable unit,

the first movable part is moved in a plane orthogonal to the optical axis direction by the driving force of the driving part to perform the shake correction,

the support portion is formed of a suspension wire extending in the optical axis direction, and the lens driving device further includes:

an XY-direction movement restricting unit that restricts movement of the first movable unit so that a movable stroke of the first movable unit in an X direction and a Y direction orthogonal to each other within the optical axis orthogonal plane is within a range of a first movement stroke L1; and

an intermediate direction movement restricting unit that restricts movement of the first movable unit so that a movable stroke of the first movable unit in an intermediate direction, which is a direction at 45 ° to the X direction and the Y direction, is within a range of a second movement stroke L2,

the second movement stroke L2 is satisfied

The camera module of the present invention includes: the lens driving device described above;

a lens unit attached to the first movable unit; and

and an imaging unit that images the subject image formed by the lens unit.

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

the above-described camera module; and

and an image processing unit that processes the image information obtained by the camera module.

Effects of the invention

According to the present invention, it is possible to suppress the application of a load exceeding an assumed load to the suspension wire, and to improve the reliability.

Drawings

Fig. 1A and 1B are diagrams illustrating a smartphone on which a camera module according to an embodiment of the present invention is mounted.

Fig. 2 is an external perspective view of the camera module.

Fig. 3 is a perspective view showing a state where a cover of the lens driving device is removed.

Fig. 4 is an exploded perspective view showing a schematic configuration of the lens driving device.

Fig. 5 is an exploded perspective view showing a detailed configuration of the lens driving device.

Fig. 6 is an exploded perspective view showing a detailed configuration of the lens driving device.

Fig. 7 is a perspective view showing the intermediate direction movement restricting section of the lens driving device.

Fig. 8A and 8B are plan views showing a movement restriction structure in the plane orthogonal to the optical axis of the lens driving device.

Fig. 9A and 9B are plan views showing a movable stroke in the optical axis orthogonal plane of the lens driving device.

Fig. 10A and 10B are views showing an automobile as a camera mounting device on which an onboard camera module is mounted.

Description of the reference numerals

1 lens driving device

2 lens part

11 lens holder

12 magnet support

Coil for 13 AF

14A-14D driving magnet

15 upper side elastic support member

16 lower side elastic support member

21 base

22 coil substrate

Coil for 23A-23D OIS

24 suspension wire

51 XY-direction movement restricting portion

52 middle direction movement restricting part

D1 OIS driver (driver)

F1 OIS securing part (first securing part)

M1 OIS Movable part (first Movable part)

S1 OIS support (support)

M smart mobile phone

A camera module

Detailed Description

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

Fig. 1A and 1B are diagrams showing a smartphone M (an example of a camera-mounted device) on which a camera module a according to an embodiment of the present invention is mounted. Fig. 1A is a front view of the smartphone M, and fig. 1B is a rear view of the smartphone M.

In the present embodiment, the camera module a is applied to the back camera OC1 of the smartphone M. The camera module a has an AF function and an OIS function, and can automatically perform autofocus when capturing an object and optically correct a shake (vibration) generated during capturing to capture an image without image blur.

Fig. 2 is an external perspective view of the camera module a. As shown in fig. 2, in the embodiment, the description will be made using an orthogonal coordinate system (X, Y, Z). In the figures described later, the same orthogonal coordinate system (X, Y, Z) is also used. The following description will be given taking the intermediate direction as a direction at 45 ° to the X direction and the Y direction, i.e., the diagonal direction in the plan view of the camera module a viewed from the optical axis direction as the U direction and the V direction.

The camera module a is mounted as follows: when the smartphone M actually performs shooting, the X direction is the up-down direction (or the left-right direction), the Y direction is the left-right direction (or the up-down direction), and the Z direction is the front-back direction. That is, the Z direction is the optical axis direction, the upper side in the figure is the optical axis direction light receiving side (also referred to as "macro position side"), and the lower side is the optical axis direction image forming side (also referred to as "infinite position side"). The X direction and the Y direction orthogonal to the Z axis are referred to as "orthogonal optical axis directions".

The camera module a includes a lens driving device 1 that realizes an AF function and an OIS function, a lens unit 2 that accommodates a lens in a cylindrical lens barrel, an image pickup unit 3 that picks up an object image formed by the lens unit 2, and the like.

The imaging unit 3 is disposed on the image forming side in the optical axis direction of the lens driving device 1. The imaging unit 3 includes, for example, an image sensor substrate 41, an imaging element 42, a control unit 43 for controlling the driving of the lens driving device 1, and the like. The lens driving device 1 is mounted on the image sensor substrate 41, and is mechanically and electrically connected to the image sensor substrate 41. The image pickup element 42 is configured by, for example, a CCD (charge-coupled device) type image sensor, a CMOS (complementary metal oxide semiconductor) type image sensor, or the like. The image pickup device 42 is mounted on the image sensor substrate 41, and picks up an image of the subject formed by the lens unit 2. The control unit 43 controls the driving of the lens driving device 1. The control unit 43 may be mounted on the image sensor substrate 41, or may be provided in a camera-mounted device (smartphone M in the embodiment) on which the camera module a is mounted.

As shown in fig. 3, in the lens driving device 1, the outside of the driving device main body (reference numeral omitted) is covered with a cover 25. The cover 25 is a rectangular prism-shaped covered cylinder in a plan view when viewed from the optical axis direction, and has an opening 251 on the upper surface. The lens portion 2 faces outward from the opening 251. The cover 25 is fixed to the base 21 of the lens driving device 1 by, for example, adhesion. That is, the lens driving device 1 has a rectangular shape spreading in the X direction and the Y direction in a plan view seen from the optical axis direction. In the following description, the "plan view" refers to a plan view viewed from the optical axis direction.

Fig. 4 is an exploded perspective view showing a schematic configuration of the lens driving device 1. Fig. 5 and 6 are exploded perspective views showing the detailed structure of the lens driving device 1. In fig. 4 to 6, the cover 25 is omitted.

To explain the function, as shown in fig. 4, the lens driving device 1 includes: the OIS movable section M1, OIS fixed section F1, OIS driving section D1, OIS supporting section S1, AF movable section M2, AF fixed section F2, AF driving section D2, and AF supporting section S2.

The OIS movable section M1 is a section that swings in the plane orthogonal to the optical axis upon receiving the driving force of the OIS driving section D1 during shake correction, and is configured by an AF unit including an AF movable section M2, an AF fixed section F2, an AF driving section D2, and an AF supporting section S2 in the present embodiment.

The OIS fixing portion F1 is a portion for supporting the OIS movable portion M1, and is constituted by the base 21 in the present embodiment. The OIS fixing portion F1 is disposed at a distance from the OIS movable portion M1 toward the image forming side in the optical axis direction, for example.

The OIS supporting portion S1 is a portion connecting the OIS movable portion M1 and the OIS fixing portion F1, and supports the OIS movable portion M1 so that the OIS movable portion M1 can swing in the plane orthogonal to the optical axis. In the present embodiment, the OIS supporting portion S1 is formed of suspension wires 24 arranged at four corners.

The OIS driver D1 includes OIS coils 23A to 23D disposed in the OIS fixing section F1 and drive magnets 14A to 14D (OIS magnets) disposed in the OIS movable section M1. That is, a moving magnet type voice coil motor is applied to the OIS driver D1. The OIS driver D1 may be a moving coil type voice coil motor.

The AF movable portion M2 is a portion that moves in the optical axis direction by receiving the driving force of the AF driving portion D2 at the time of autofocus, and is constituted by the lens holder 11 in the present embodiment.

The AF fixing portion F2 is a portion that supports the AF movable portion M2, and is constituted by the magnet holder 12 in the present embodiment. The AF fixing portion F2 is disposed radially outward of the AF movable portion M2, for example.

The AF supporting portion S2 is a portion connecting the AF movable portion M2 and the AF fixing portion F2, and in the present embodiment, is composed of an upper elastic supporting member 15 disposed on the light receiving side (upper side) in the optical axis direction and a lower elastic supporting member 16 disposed on the image forming side (lower side) in the optical axis direction.

The AF driving unit D2 is a unit that drives the AF movable unit M2 during autofocus, and in the present embodiment, is configured by the AF coil 13 disposed in the AF movable unit M2 and the driving magnets 14A to 14D (AF magnets) disposed in the AF fixing unit F2. That is, a moving coil type voice coil motor is applied to the AF drive unit D2 of the present embodiment. The AF drive unit D2 may be a moving magnet type voice coil motor.

In the lens driving device 1, a guaranteed stroke is defined, which indicates a degree at which shake correction can be appropriately performed. That is, the shapes, sizes, strengths, and the like of the constituent members of the OIS movable section M1, the OIS fixed section F1, the OIS driving section D1, and the OIS supporting section S1 are set so as to secure the stroke.

As shown in fig. 5 and 6, the lens driving device 1 includes: a lens holder 11, a magnet holder 12, an AF coil 13, driving magnets 14A to 14D, an upper elastic support member 15, a lower elastic support member 16, a base 21, a coil substrate 22, OIS coils 23A to 23D, a suspension wire 24, and the like.

The lens holder 11 functions as an AF movable section M2, and holds the lens section 2 in the cylindrical lens housing section 111 (see fig. 2). The lens unit 2 is fixed to the lens housing section 111 by adhesion or screwing. In the present embodiment, the lens holder 11 has a substantially octagonal outer shape in plan view. Further, an AF coil 13 is attached to the circumferential surface of the lens holder 11.

The lens holder 11 has an upper spring fixing portion 112 for fixing the upper elastic support member 15 on the upper surface (the upper end surface of the lens housing portion 111). The upper spring fixing portion 112 is provided with, for example, a positioning projection (reference numeral omitted) projecting toward the light receiving side in the optical axis direction, and the upper elastic support member 15 is positioned by the positioning projection.

The lens holder 11 has a lower spring fixing portion 113 for fixing the lower elastic support member 16 on the lower surface. The lower spring fixing portion 113 is provided with, for example, a positioning projection (reference numeral omitted) projecting toward the image forming side in the optical axis direction, and the lower elastic support member 16 is positioned by the positioning projection.

The lens holder 11 has a binding portion 114 on the upper surface thereof for connecting the end portions of the AF coil 13. The lens holder 11 has a convex portion 115 protruding radially outward on the upper portion of the outer peripheral surface of the lens housing portion 111. In the present embodiment, the convex portions 115 are provided at four locations facing each other in the X direction and the Y direction.

The magnet holder 12 is a holding member that is formed by connecting four side wall bodies 122 and has a substantially rectangular tubular shape in plan view. The magnet holder 12 has an opening 121, and the opening 121 is formed by cutting out a portion corresponding to an outline of a substantially octagonal shape when viewed from above the lens holder 11.

The magnet holder 12 includes magnet holding portions 123 inside the coupling portions of the four side wall bodies 122 (four corners of the magnet holder 12). The driving magnets 14A to 14D are fixed to the magnet holding portion 123. For example, the magnet holding portion 123 is provided with an opening (reference numeral omitted) communicating with the outside, so that the adhesive can be injected on the contact surface between the magnet holding portion 123 and the driving magnets 14A to 14D.

The magnet holder 12 has a wire insertion portion 124 recessed radially inward in an arc shape at an upper portion of the coupling portion on the outer peripheral surface of the side wall 122. The suspension wire 24 is disposed in the wire insertion portion 124. By providing the wire insertion portion 124, it is possible to avoid interference between the suspension wire 24 and the magnet holder 12 when the OIS movable portion M1 swings.

The magnet holder 12 has an upper spring fixing portion 126 for fixing the upper elastic support member 15 on the upper surface of the side wall 122. In the upper spring fixing portion 126, the peripheral edge of the wire insertion portion 124 is formed recessed downward from the mounting surface of the upper elastic support member 15, so that a gap is formed when the upper elastic support member 15 is mounted.

The magnet holder 12 has a lower spring fixing portion 127 for fixing the lower elastic support member 16 on the lower surface of the side wall 122.

The magnet holder 12 has a recess 125 recessed from the light-receiving side toward the image-forming side in the optical axis direction at a position corresponding to the projection 115 of the lens holder 11 on the upper portion of the side wall 122. When the lens holder 11 is moved to the image side in the optical axis direction, the convex portion 115 of the lens holder 11 is locked to the concave portion 125 of the magnet holder 12, and the movement of the lens holder 11 to the image side in the optical axis direction is restricted.

Further, a plurality of protruding portions 128 protruding toward the light receiving side in the optical axis direction are provided on the upper surface of the magnet holder 12. By providing the protruding portion 128, it is possible to avoid a situation in which the cover 25 directly collides with a main portion of the lens driving device 1 when an external force in the optical axis direction is received by dropping or the like, and it is possible to suppress a failure of the lens driving device 1.

The magnet holder 12 also has a movable-side regulating portion 129 (see fig. 7) for regulating the U-direction and V-direction movements of the OIS movable portion M1. The movable-side restricting portion 129 constitutes the intermediate-direction movement restricting portion 52 together with the fixed-side restricting portion 212 of the base 21 (see fig. 8A).

In the present embodiment, a movable-side restricting portion 129 is provided on the outer peripheral surface of the side wall 122 so as to be recessed inward (toward the optical axis) of the outer shape of the magnet holder 12 at the lower portion of the coupling portion (below the wire insertion portion 124). The movable-side restricting portion 129 has an intermediate-direction facing surface 129a perpendicular to the U direction or the V direction, and has an optical-axis-direction facing surface 129b perpendicular to the optical axis direction.

The AF coil 13 is an air-core coil that is energized during autofocus, and is wound around the outer peripheral surface of the coil winding portion of the lens holder 11. The AF coil 13 and the driving magnets 14A to 14D together constitute a voice coil motor that functions as an AF driving unit D2. Both ends of the AF coil 13 are bound to the binding portions 114 of the lens holder 11. For example, the AF coil 13 is energized through the suspension wire 24 and the upper elastic support member 15. The current applied to the AF coil 13 is controlled by the controller 43, for example.

The driving magnets 14A to 14D are fixed to the magnet holding portion 123 of the magnet holder 12 by, for example, adhesion. In the present embodiment, the driving magnets 14A to 14D have a substantially isosceles trapezoid shape in plan view. This makes it possible to effectively use the space (magnet holding portion 123) at the corner of the magnet holder 12.

The driving magnets 14A to 14D are arranged spaced apart from the AF coil 13 in the radial direction and spaced apart from the OIS coils 23A to 23D in the optical axis direction. The drive magnets 14A to 14D are magnetized so as to form a magnetic field that traverses the AF coil 13 in the radial direction (U direction or V direction) and traverses the OIS coils 23A to 23D in the optical axis direction (Z direction). The driving magnets 14A to 14D constitute a voice coil motor functioning as an AF driving unit D2 together with the AF coil 13. The driving magnets 14A to 14D and the OIS coils 23A to 23D together constitute a voice coil motor functioning as the OIS driver D1. That is, in the present embodiment, the driving magnets 14A to 14D serve as both the AF magnet and the OIS magnet.

The upper elastic support member 15 elastically supports the lens holder 11 as the AF movable unit M2 on the light receiving side in the optical axis direction with respect to the magnet holder 12 as the AF fixing unit F2. The upper elastic support member 15 is formed of, for example, titanium copper, nickel copper, stainless steel, or the like. The upper elastic support member 15 is rectangular as a whole in plan view, that is, has the same shape as the magnet holder 12. The upper elastic support member 15 is formed of two plate springs, and is disposed on the magnet holder 12 so as not to contact each other. The upper elastic support member 15 is formed by etching a single sheet of sheet metal, for example.

The upper elastic support member 15 includes a lens holder fixing portion 151 fixed to the lens holder 11, a magnet holder fixing portion 152 fixed to the magnet holder 12, and an arm portion 153 elastically deformed in accordance with the movement of the lens holder 11.

The lens holder fixing portion 151 has a shape corresponding to the upper spring fixing portion 112 of the lens holder 11. The lens holder fixing portion 151 is displaced together with the lens holder 11 when the lens holder 11 moves in the optical axis direction. The magnet holder fixing portion 152 has a shape corresponding to the upper spring fixing portion 126 of the magnet holder 12. The arm 153 connects the lens holder fixing portion 151 and the magnet holder fixing portion 152. The arm 153 has a curved shape and is easily elastically deformed when the lens holder 11 moves.

The upper elastic support member 15 is positioned with respect to the lens holder 11 and the magnet holder 12, and is fixed thereto by, for example, adhesion. A part of the lens holder fixing portion 151 is electrically connected to the AF coil 13 bound to the binding portion 114 of the lens holder 11 by, for example, soldering. The end (corner) of the magnet holder fixing portion 152 is connected to the suspension wire 24 (wire connecting portion 154). The upper elastic support member 15 forms a power supply path from the terminal fitting 27 to the AF coil 13 together with the suspension wire 24.

The lower elastic support member 16 elastically supports the lens holder 11 as the AF movable unit M2 on the image forming side in the optical axis direction with respect to the magnet holder 12 as the AF fixing unit F2. The lower elastic support member 16 is formed of, for example, titanium copper, nickel copper, stainless steel, or the like. The lower elastic support member 16 is rectangular as a whole in plan view, that is, has the same shape as the magnet holder 12. The lower elastic support member 16 is formed by, for example, etching a single sheet of sheet metal.

The lower elastic support member 16 includes a lens holder fixing portion 161 fixed to the lens holder 11, a magnet holder fixing portion 162 fixed to the magnet holder 12, and an arm portion 163 elastically deformed in accordance with the movement of the lens holder 11.

The lens holder fixing portion 161 has a shape corresponding to the lower spring fixing portion 113 of the lens holder 11. The lens holder fixing portion 161 is displaced together with the lens holder 11 when the lens holder 11 moves in the optical axis direction. The magnet holder fixing portion 162 has a shape corresponding to the lower spring fixing portion 127 of the magnet holder 12. The arm 163 connects the lens holder fixing portion 161 and the magnet holder fixing portion 162. The arm 163 has a curved shape and is easily elastically deformed when the lens holder 11 moves.

The lower elastic support member 16 is positioned with respect to the lens holder 11 and the magnet holder 12, and is fixed thereto by, for example, adhesion.

The base 21 has a rectangular shape in plan view, and a circular opening 211 is formed in the center thereof. In the camera module a, an image sensor substrate 41 on which an imaging element 42 is mounted is disposed on the imaging side of the base 21 in the optical axis direction.

The terminal metal fittings 26, 27 are embedded in the base 21 by, for example, insert molding.

The terminal metal fittings 26 are electrically connected to the wiring pattern of the image sensor substrate 41, and form signal lines for power supply to the OIS coils 23A to 23D and the magnetic sensors 31A and 31B and signal lines for detection signals output from the magnetic sensors 31A and 31B.

The terminal fitting 27 is exposed from four corners of the base 21 and connected to the other end of the suspension wire 24 by welding. Two of the four terminal fittings 27 are electrically connected to the wiring pattern of the image sensor substrate 41, and form power supply lines for supplying power to the AF coil 13.

The base 21 further includes a fixed-side regulating portion 212 (see fig. 7) for regulating the U-direction and V-direction movements of the OIS movable portion M1. The fixed-side regulating portion 212 constitutes the intermediate-direction movement regulating portion 52 together with the movable-side regulating portion 129 of the magnet holder 12 (see fig. 8A).

In the present embodiment, the fixed-side restricting portions 212 are provided at four corners of the base 21 so as to protrude toward the light-receiving side in the optical axis direction. The fixed-side regulating part 212 has, for example, a triangular prism shape, and has an intermediate-direction facing surface 212a perpendicular to the U direction or the V direction and an optical-axis-direction facing surface 212b perpendicular to the optical axis direction. In the present embodiment, two fixed-side restricting portions 212 are disposed with respect to one corner portion so as to sandwich the suspension wire 24, but the form of the fixed-side restricting portions 212 is not limited to this. For example, the intermediate direction facing surfaces 212a of the two fixed-side regulating portions 212 may be connected.

The intermediate direction facing surface 212a faces the intermediate direction facing surface 129a of the magnet holder 12 in the U direction or the V direction. When the OIS movable portion M1 swings within the optical axis orthogonal plane, it abuts against the intermediate direction facing surfaces 129a and 212a, and the OIS movable portion M1 is restricted from moving in the U direction and the V direction.

The optical axis direction facing surface 212b faces the optical axis direction facing surface 129b of the magnet holder 12 in the optical axis direction. The distance between the optical axis direction facing surface 212b and the optical axis direction facing surface 129b is set smaller than the distance between the OIS movable section M1 and the OIS fixing section F1. This can prevent the main parts (for example, the OIS coils 23A to 23D and the drive magnets 14A to 14D) of the lens drive device 1 from directly colliding with each other when an external force in the optical axis direction is received by dropping or the like, and can suppress a failure of the lens drive device 1.

Similarly to the base 21, the coil substrate 22 is a rectangular substrate in plan view, and has a circular opening 221 at the center. The coil substrate 22 has a wiring pattern (not shown) including power supply lines for supplying power to the OIS coils 23A to 23D and the magnetic sensors 31A and 31B, and signal lines for detection signals output from the magnetic sensors 31A and 31B. The wiring pattern is electrically connected to the terminal metal fittings 26 disposed on the base 21.

The OIS coils 23A to 23D are disposed at positions facing the drive magnets 14A to 14D in the optical axis direction. For example, in the manufacturing process of the coil substrate 22, the OIS coils 23A to 23D are formed inside the coil substrate 22.

The OIS coils 23A to 23D are air-core coils that are energized during shake correction. The sizes and the arrangements of the OIS coils 23A to 23D and the drive magnets 14A to 14D are set so that the edges of the drive magnets 14A to 14D in the radial direction do not exceed the coil cross-sectional width of each of the OIS coils 23A to 23D, that is, so that the magnetic field radiated from the bottom surfaces of the drive magnets 14A to 14D crosses the two opposing sides of the OIS coils 23A to 23D and then returns to the drive magnets 14A to 14D. Here, the OIS coils 23A to 23D have the same shape as the planar shape (here, a substantially isosceles trapezoidal shape) of the drive magnets 14A to 14D. This enables efficient generation of a driving force (electromagnetic force) for swinging the OIS movable section M1 in the plane orthogonal to the optical axis. The energization current of the OIS coils 23A to 23D is controlled by the control unit 43, for example.

The OIS coils 23A and 23C arranged to face each other in the U direction and the OIS coils 23B and 23D arranged to face each other in the V direction are connected to each other, and the same current is applied thereto. The drive magnets 14A and 14C and the OIS coils 23A and 23C constitute an OIS voice coil motor that swings the OIS movable portion M1 in the U direction. Further, the driving magnets 14B and 14D and the OIS coils 23B and 23D constitute an OIS voice coil motor for swinging the OIS movable portion M1 in the V direction.

Magnetic sensors 31A and 31B are mounted on the lower surface of the coil substrate 22. The magnetic sensors 31A and 31B are configured by, for example, hall elements or TMR (Tunnel Resistance) sensors, and are disposed at positions facing the driving magnets 14A and 14B in the optical axis direction, respectively. In the present embodiment, the magnetic sensors 31A and 31B are disposed on the back surfaces of the air-core portions of the OIS coils 23A and 23B, respectively.

By detecting the magnetic field formed by the driving magnets 14A and 14B by the magnetic sensors 31A and 31B, the position of the OIS movable section M1 in the plane orthogonal to the optical axis can be specified. That is, in the present embodiment, the magnetic sensors 31A and 31B and the driving magnets 14A and 14B constitute an XY position detecting unit. Further, the magnet for detecting the XY position of the OIS movable unit M1 may be disposed in the OIS movable unit M1 separately from the driving magnets 14A and 14B. That is, in the present embodiment, the driving magnets 14A and 14B are used as the magnets for XY position detection.

The suspension wire 24 is a linear member extending in the optical axis direction, and is elastically deformed in accordance with the swing of the OIS movable portion M1. One end (the end on the light receiving side in the optical axis direction, the upper end) of the suspension wire 24 is fixed to the OIS movable section M1 (the upper elastic support member 15 in the present embodiment), and the other end (the end on the image forming side in the optical axis direction) is fixed to the OIS fixing section F1 (the base 21 in the present embodiment). In the present embodiment, two of the four suspension wires 24 are used as power supply paths to the AF coil 13 together with the upper elastic support member 15.

When the lens driving device 1 performs the shake correction, the OIS coils 23A to 23D are energized. Specifically, the OIS driver controls the current to be supplied to the OIS coils 23A to 23D based on a detection signal from a shake detector (not shown, for example, a gyro sensor) so that the shake of the camera module a is canceled. At this time, the oscillation of the OIS movable unit M1 can be accurately controlled by feeding back the detection results of the magnetic sensors 31A and 31B.

When the OIS coils 23A to 23D are energized, lorentz forces (fleming's left-hand rule) are generated in the OIS coils 23A to 23D due to the interaction between the magnetic field of the drive magnets 14A to 14D and the current flowing through the OIS coils 23A to 23D. The direction of the lorentz force is a direction (V direction or U direction) orthogonal to the direction of the magnetic field (Z direction) and the direction of the current (U direction or V direction) at the long side portions of the OIS coils 23A to 23D. Since the OIS coils 23A to 23D are fixed, a reaction force acts on the driving magnets 14A to 14D. This reaction force is a driving force of the OIS voice coil motor, and the OIS movable portion M1 having the driving magnets 14A to 14D swings in the XY plane to correct the jitter.

Fig. 8A and 8B are plan views showing a movement restriction structure in the plane orthogonal to the optical axis of the lens driving device 1.

As shown in fig. 8A and 8B, the movement of the OIS movable portion M1 in the X direction and the Y direction is restricted by the outer surface of the magnet holder 12 abutting against the inner surface of the cover 25. That is, the cover 25 and the magnet holder 12 constitute the XY-direction movement restricting unit 51 that restricts the movement of the OIS movable portion M1 so that the movable stroke of the OIS movable portion M1 in the X-direction and the Y-direction is within the range of the first movement stroke L1 (for example, the guaranteed stroke +120 μ M). That is, the inner surface of the cover 25 is spaced apart from the outer surface of the magnet holder 12 by the first movement stroke L1.

On the other hand, the movement of the OIS movable portion M1 in the U direction and the V direction (intermediate direction) is regulated by the contact between the movable-side regulating portion 129 (intermediate direction facing surface 129a) of the magnet holder 12 and the fixed-side regulating portion 212 (intermediate direction facing surface 212a) of the base 21. That is, the movable-side limiter 129 and the fixed-side limiter 212 constitute the intermediate-direction movement limiter 52 that limits the movement of the OIS movable section M1 so that the movable stroke of the OIS movable section M1 in the intermediate direction is within the range of the second movement stroke L2. That is, the intermediate direction opposite surface 129a of the magnet holder 12 is spaced apart from the intermediate direction opposite surface 212a of the base 21 by the second movement stroke L2. The second movement stroke L2 is set to satisfy

In the case where the intermediate direction movement restricting section 52 is not provided as in the conventional lens driving device, the movable stroke in the intermediate direction of the OIS movable section M1 is the first movable stroke L1Multiple (see fig. 9B). In contrast, in the present embodiment, the movement is caused in the intermediate directionThe restricting portion 52 functions such that the movable stroke in the intermediate direction of the OIS movable portion M1 is equal to (at least smaller than) the first movable stroke L1). This can suppress the suspension wire 24 from being subjected to an unexpected load when the OIS movable portion M1 swings. In particular, by setting the second movement stroke L2 to be the same as the first movement stroke L1, the suspension wire 24 having the minimum characteristic based on the guaranteed stroke and having the appropriate quality can be used, and the lens driving device 1 can be reduced in size and weight.

When the lens driving device 1 performs autofocus, the AF coil 13 is energized. When the AF coil 13 is energized by supplying power from the base 21 to the AF coil 13 through the suspension wires 24 and the upper elastic support member 15, a lorentz force is generated in the AF coil 13 by the interaction between the magnetic field of the driving magnets 14A to 14D and the current flowing through the AF coil 13. The direction of the lorentz force is a direction (Z direction) orthogonal to the direction of the magnetic field of the drive magnets 14A to 14D and the direction of the current flowing through the AF coil 13. Since the driving magnets 14A to 14D are fixed, a reaction force acts on the AF coil 13. This reaction force is a driving force of the voice coil motor for AF, and the lens holder 11(AF movable portion M2) on which the coil 13 for AF is arranged moves in the optical axis direction, thereby performing autofocus.

In the non-energized state in which the autofocus is not performed, the AF movable unit M2 (lens holder 11) is held in a state of being suspended between the infinity position and the macro position (hereinafter referred to as "reference state") by, for example, the AF support unit S2 (upper elastic support member 15 and lower elastic support member 16). That is, the AF movable portion M2 is elastically supported by the AF support portion S2 so as to be displaceable on both sides in the Z direction in a state of being positioned with respect to the AF fixing portion F2 (magnet holder 12). In the autofocus, the direction of the current is controlled depending on whether the lens holder 11 is moved from the reference state to the macro position side or to the infinity position side. In addition, the magnitude of the current is controlled in accordance with the moving distance (stroke) from the reference state of the lens holder 11.

In this way, the lens driving device 1 includes: OIS fixing section F1 (first fixing section); an OIS movable section M1 (first movable section) disposed at a distance from the OIS fixing section F1 in the optical axis direction; OIS supporting section S1 (supporting section) connecting OIS fixing section F1 and OIS movable section M1; and an OIS driver D1 (driving unit) for moving the OIS movable unit M1, wherein the OIS movable unit M1 is moved in a plane orthogonal to the optical axis direction by a driving force of the OIS driver D1, thereby correcting the shake.

The OIS supporting section S1 is formed of the suspension wire 24 extending in the optical axis direction, and the lens driving device 1 includes: an XY-direction movement limiting unit 51 configured to limit movement of the OIS movable unit M1 so that the movable stroke of the OIS movable unit M1 in the X direction and the Y direction orthogonal to each other in the optical axis orthogonal plane is within the range of the first movement stroke L1; and an intermediate-direction movement restricting unit 52 that restricts the movement of the OIS movable unit M1 so that the movable stroke of the OIS movable unit M1 in the U-direction and the V-direction (intermediate direction), which are directions at 45 ° to the X-direction and the Y-direction, is within the range of the second movement stroke L2. The second movement stroke L2 is set to satisfy

According to the lens driving device 1, it is possible to suppress the suspension wire 24 from being applied with a load exceeding an assumed load when the OIS movable portion M1 swings. Therefore, the reliability of the lens driving device 1 is improved.

The lens driving device 1 has a rectangular shape extending in the X direction and the Y direction in a plan view seen from the optical axis direction, and the intermediate direction movement restricting portions 52 are provided at positions corresponding to four corners of the rectangular shape.

This makes it possible to effectively utilize the dead space around the suspension wire 24 and restrict the movement of the OIS movable portion M1 in the intermediate direction.

In the lens driving device 1, the intermediate direction movement restricting unit 52 includes: a fixed-side restricting unit 212 provided on the OIS fixing unit F1 so as to protrude toward the light-receiving side in the optical axis direction; and a movable-side restricting portion 129 provided on the OIS movable portion M1 so as to be recessed inward from the outer shape of the OIS movable portion M1 in plan view, the fixed-side restricting portion 212 and the movable-side restricting portion 129 having intermediate-direction facing surfaces 212a and 129a facing each other in the intermediate direction.

Accordingly, since the movement of the OIS movable section M1 is restricted by the surface contact of the intermediate direction facing surfaces 212a and 129a, the movement of the OIS movable section M1 in the intermediate direction can be reliably restricted.

In the lens driving device 1, the OIS movable section M1 includes an AF movable section M2 (second movable section) movable in the optical axis direction, and the fixed-side restricting section 212 and the movable-side restricting section 129 include an optical axis direction facing surface 212b and an optical axis direction facing surface 129b facing each other in the optical axis direction.

This can avoid the main parts of the lens driving device 1 (for example, the OIS coils 23A to 23D and the driving magnets 14A to 14D) from directly colliding with each other when an external force in the optical axis direction is received by dropping or the like, and can suppress a failure of the lens driving device 1.

In the lens driving device 1, the first stroke L1 is the same as the second stroke L2. Accordingly, the suspension wire 24 having the minimum characteristic based on the guaranteed stroke and having an appropriate quality can be used, and the lens driving device 1 can be reduced in size and weight.

The invention made by the present inventor has been specifically described above based on the embodiments, but the present invention is not limited to the above embodiments and can be modified within a range not departing from the gist thereof.

For example, in the embodiment, the smartphone M of the mobile terminal with a camera is described as an example of the camera mounting device provided with the camera module a, but the present invention is applicable to a camera mounting device as information equipment or transportation equipment. A camera-mounted device as an information apparatus is an information apparatus having a camera module and a control unit that processes image information obtained by the camera module, and includes, for example: a camera-equipped portable phone, a notebook computer, a tablet terminal, a portable game machine, a network (web) camera, and a camera-equipped in-vehicle device (e.g., a rear monitor device, a drive recorder device). The camera mounting device as the transportation equipment is a transportation equipment having a camera module and a control unit for processing an image obtained by the camera module, and includes, for example, an automobile.

Fig. 10A and 10B are views showing a Vehicle V as a Camera mounting device on which a Vehicle Camera module VC (Vehicle Camera) is mounted. Fig. 10A is a front view of the automobile V, and fig. 10B is a rear perspective view of the automobile V. The vehicle V is equipped with the camera module a described in the embodiment as a vehicle-mounted camera module VC. As shown in fig. 10A and 10B, the vehicle-mounted camera module VC is attached to, for example, a windshield glass toward the front or a tailgate toward the rear. The in-vehicle camera module VC is used as a camera module for rear monitoring, a drive recorder, collision avoidance control, automatic driving control, and the like.

For example, the structure of the intermediate direction movement restricting portion is not limited to the structure described in the embodiment, and may be changed as appropriate. For example, the fixed-side restricting portion constituting the intermediate-direction movement restricting portion may be provided not in the base 21 but in the cover 25.

The presently disclosed embodiments are to be considered in all respects as illustrative and not restrictive. The scope of the present invention is defined by the claims, and all changes that come within the meaning and range of equivalency of the claims are intended to be embraced therein.