JP2019074757A - Lens driving device, camera module and camera mounting device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a lens driving device, a camera module, and a camera mounting device capable of improving OIS sensitivity and facilitating assembly work while ensuring high reliability. A lens driving device uses the driving force of a voice coil motor to swing a shake-correcting movable portion with respect to a shake-correcting fixed portion in a plane orthogonal to the optical axis direction to perform shake correction. It is equipped with a runout correction drive unit, and this runout correction drive unit automatically focuses by moving the AF movable part in the optical axis direction with respect to the AF fixed part using the driving force of the voice coil motor. Includes an AF drive unit that performs The runout correction support portion of the runout correction drive unit is made of an elastomer material and has a biaxial hinge structure that movably supports the runout correction movable portion in a plane orthogonal to the optical axis. The AF support portion of the AF drive unit is made of an elastomer material and has a biaxial hinge structure that movably supports the AF movable portion in the optical axis direction. [Selection diagram] Fig. 6

Description

  The present invention relates to a lens driving device for shake correction, a camera module having a shake correction function, and a camera mounted device.

  Generally, a small camera module is mounted on a mobile terminal such as a smartphone. In such a camera module, an auto focus function (hereinafter referred to as "AF function"; AF: Auto Focus) for automatically performing focusing when shooting a subject and shake (vibration) generated during shooting are optically A lens driving device having a shake correction function (hereinafter, referred to as “OIS function”, OIS: Optical Image Stabilization) for correcting and reducing image disturbance is applied (for example, Patent Document 1).

  A lens drive device having an autofocus function and a shake correction 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 lens unit in the optical axis direction. A shake correction drive unit (hereinafter, referred to as an “OIS drive unit”) for swinging in a plane orthogonal to one another is provided.

  The AF driving unit includes, for example, an autofocus coil unit (hereinafter, referred to as “AF coil unit”) disposed around the lens unit, and an autofocus coil unit disposed in a radial direction away from the AF coil unit. A lens portion and an AF coil portion are included with respect to a focusing magnet portion (hereinafter referred to as “AF magnet portion”) and an autofocus fixing portion including the AF magnet portion (hereinafter referred to as “AF fixed portion”) And an elastic supporting portion (for example, a leaf spring) for elastically supporting the autofocus movable portion (hereinafter referred to as "AF movable portion"). Focusing is automatically performed by moving the AF movable unit in the optical axis direction with respect to the AF fixed unit using the driving force of the voice coil motor configured by the AF coil unit and the AF magnet unit. To be done. The AF fixing unit may include the AF coil unit, and the AF movable unit may include the AF magnet unit.

  The drive unit for OIS includes, for example, a shake correction magnet unit (hereinafter referred to as “OIS magnet unit”) disposed in the AF drive unit, and a shake correction coil disposed apart from the OIS magnet unit. Shake correction including an AF drive unit and an OIS magnet unit with respect to a shake correction fixing unit (hereinafter referred to as an “OIS fixing unit”) including a coil unit for OIS (hereinafter referred to as “OIS coil unit”) And a support portion for supporting the movable portion (hereinafter referred to as "OIS movable portion"). By swinging the OIS movable part with respect to the OIS fixed part in a plane orthogonal to the optical axis direction using the driving force of the voice coil motor configured by the OIS magnet part and the OIS coil part, Shake correction is performed (so-called barrel shift method). The OIS magnet unit can also be used as the AF magnet unit, and in this case, the lens drive device can be miniaturized and reduced in height. Moreover, as a support part which supports OIS movable part with respect to OIS fixing | fixed part, a suspension wire is applied, for example.

JP, 2013-24938, A

  By the way, in order to improve the sensitivity of the drive unit for OIS (hereinafter referred to as "OIS sensitivity"), it is preferable that the wire diameter of the suspension wire be smaller. However, when the wire diameter of the suspension wire is reduced, the risk of breaking when receiving an impact such as falling is increased. In addition, since the suspension wire is easily bent and the OIS movable portion can not move in parallel (the lens portion is inclined), the tilt characteristic at the time of shake correction is degraded. The tilt characteristic is an index indicating the parallelism of the OIS movable part at the time of shake correction, and is expressed by the inclination angle of the lens part accompanying the movement of the OIS movable part. As described above, if the wire diameter of the suspension wire is reduced to increase the OIS sensitivity, the reliability of the lens driving device is lost.

  In addition, in the conventional AF drive unit, the AF movable unit is configured to be held by the plate spring, so the number of parts is large and the structure is complicated, and complicated assembly work is required.

  An object of the present invention is to provide a lens driving device capable of improving the OIS sensitivity while securing high reliability and further facilitating an assembly operation, a camera module including the same, and a camera mounting device.

The lens drive device according to the present invention is
A shake correction fixing unit including the shake correction coil unit, including a shake correction magnet unit disposed around the lens unit, and a shake correction coil unit spaced apart from the shake correction magnet unit. A shake correction drive unit for swinging the shake correction movable unit including the shake correction magnet unit with respect to the unit in a plane orthogonal to the optical axis direction;
The shake correction movable portion includes an autofocusing coil portion disposed around the lens portion, and an autofocusing magnet portion disposed radially apart from the autofocusing coil portion. An autofocus drive unit for moving an autofocus movable unit including the autofocus coil unit relative to an autofocus fixed unit including the autofocus magnet unit in an optical axis direction;
The shake correction magnet unit includes two shake correction magnets disposed on two orthogonal sides of four sides defining a rectangle in a plane orthogonal to the optical axis direction,
The autofocus magnet unit is configured by at least one of the shake correction magnets.

A camera module according to the present invention comprises the above lens driving device;
A lens unit attached to the lens driving device;
And an imaging unit configured to capture an object image formed by the lens unit.

The camera mounting device according to the present invention is a camera mounting device which is an information device or a transportation device, and
It is characterized by including the above camera module.

  According to the present invention, the risk of damage to the shake correction support portion and the autofocus support portion due to an impact such as falling is extremely reduced. Further, the structure is simple and the number of parts is small as compared with the prior art. Therefore, high reliability can be ensured, OIS sensitivity can be enhanced, and assembly work can be facilitated.

It is a figure which shows the smart phone which mounts the camera module which concerns on one embodiment of this invention. It is an external appearance perspective view of a camera module. It is an exploded perspective view of a camera module. It is a trihedral view which shows a lens drive device. It is a disassembled perspective view of a lens drive device. It is a disassembled perspective view of OIS movable part (drive part for AF). It is a figure which shows the attachment state of the support part for AF, and AF movable part. It is an exploded perspective view of OIS fixed part. It is a figure which shows the coil part for OIS. It is a figure which shows the magnetic flux which the coil part for OIS produces, and the relationship of XY position detection part. It is a figure which shows the bending aspect of the support part (1st side support body) for OIS. It is a figure which shows the bending aspect of the support part (2nd side support body) for OIS. It is a figure which shows the bending aspect of the support part (arm) for AF. It is a disassembled perspective view which shows the modification of the fixing | fixed part for OIS. It is a figure which shows the motor vehicle as a camera mounting apparatus which mounts a vehicle-mounted camera module.

Hereinafter, embodiments of the present invention will be described in detail based on the drawings.
FIG. 1 is a view showing a smartphone M (camera mounted device) equipped with a camera module A according to an embodiment of the present invention. FIG. 1A is a front view of the smartphone M, and FIG. 1B is a rear view of the smartphone M.

  The smartphone M mounts a camera module A, for example, as a rear camera OC. The camera module A has an auto focus function and a shake correction function, automatically performs focusing when shooting an object, and corrects shake (vibration) generated at the time of shooting to shoot an image without an image blur.

  FIG. 2 is an external perspective view of the camera module A. As shown in FIG. FIG. 3 is an exploded perspective view of the camera module A. As shown in FIGS. 2 and 3, in the present embodiment, description will be made using orthogonal coordinate systems (X, Y, Z). Also in the figures to be described later, they are represented by a common orthogonal coordinate system (X, Y, Z). The camera module A is mounted so that the X direction is the vertical direction (or the lateral direction), the Y direction is the lateral direction (or the vertical direction), and the Z direction is the longitudinal direction when photographing is actually performed by the smartphone M Ru. That is, the Z direction is the optical axis direction, and the upper side in the figure is the light receiving side ("macro position side"), and the lower side is the imaging side ("infinity side"). . Further, the X direction and the Y direction orthogonal to the optical axis direction will be referred to as “optical axis orthogonal direction”.

  The camera module A includes a lens unit 2 in which a lens is accommodated in a cylindrical lens barrel, a lens driving device 1 for AF and OIS, and an imaging unit (not shown) for capturing an object image formed by the lens unit 2 And the cover 3 etc. which cover the whole.

  The cover 3 is a square-shaped lidded square cylinder in a plan view as viewed from the optical axis direction, and has a circular opening 3 a on the top surface. The lens unit 2 faces the outside from the opening 3a. The cover 3 is fixed to the base 23 of the OIS fixing portion 20 (see FIG. 5) of the lens drive device 1. The cover 3 may be formed of a conductive material and may be grounded via the OIS fixing portion 20.

  The imaging unit (not shown) has an imaging element (not shown), and is disposed on the imaging side in the optical axis direction of the lens driving device 1, that is, on the imaging side in the optical axis direction of the OIS fixing unit 20. The imaging device (not shown) is configured of, for example, a charge coupled device (CCD) type image sensor, a complementary metal oxide semiconductor (CMOS) type image sensor, or the like. An imaging element (not shown) captures a subject image formed by the lens unit 2.

  FIG. 4 is a trihedral view showing the lens drive device 1. 4A is a plan view, FIG. 4B is a left side view, and FIG. 4C is a front view. FIG. 5 is an exploded perspective view of the lens drive device 1. As shown to FIG. 4, FIG. 5, the lens drive device 1 is provided with the OIS movable part 10, the OIS fixing | fixed part 20, the support part 30 for OIS, etc.

  The OIS movable portion 10 has an OIS magnet portion that constitutes an OIS voice coil motor, and is a portion that oscillates in an optical axis orthogonal plane orthogonal to the optical axis at the time of shake correction. The OIS fixing unit 20 has a coil unit for OIS that constitutes a voice coil motor for OIS, and is a portion that supports the OIS movable unit 10 via the OIS support unit 30. That is, a moving magnet system is adopted for the OIS drive unit in the lens drive device 1. The OIS movable unit 10 includes an AF driving unit. The OIS movable portion 10 is disposed apart from the OIS fixing portion 20 so as to be movable in a plane orthogonal to the optical axis direction. Here, the OIS movable part 10 is disposed apart from the OIS fixed part 20 on the light receiving side in the optical axis direction.

  The OIS support part 30 connects the OIS fixed part 20 and the OIS movable part 10. In the present embodiment, not the conventional suspension wire but a link member formed of an elastomeric material is adopted as the OIS support portion 30 (hereinafter referred to as “OIS link member 30”). The elastomer is a rubber-like elastic body, and includes a thermosetting elastomer (rubber) and a thermoplastic elastomer (plastic having elasticity).

  As shown in FIGS. 4 and 5, the OIS link member 30 has an upper frame 33, a first side support 31, and a second side support 32. The configuration common to the first side support 31 and the second side support will be described as "side support 31, 32".

  The upper frame body 33 is a square frame body in plan view, and is disposed to face the base 23 of the OIS fixing portion 20 in the optical axis direction. The upper frame body 33 is formed of a highly rigid material. Although a metal material or a resin material can be applied to the upper frame body 33, it is preferable to use a resin material from the viewpoint of weight reduction. In particular, a liquid crystal polymer (LCP resin) is suitable for the upper frame 33. By forming the upper frame body 33 with a liquid crystal polymer, it is possible to prevent the sinking of the OIS movable portion 10 due to its own weight while achieving weight reduction, and to secure good tilt characteristics.

  The side supports 31, 32 are formed of an elastomeric material. As a result, the risk of breakage of the side supports 31 and 32 due to an impact such as falling is extremely low as compared with the case of applying a suspension wire as the OIS support. Therefore, high reliability can be ensured, and the OIS sensitivity of the lens drive device 1 can be enhanced. In addition, since the primary resonance of the OIS drive unit can be suppressed by utilizing the damping force of the elastomer, the step of applying the damper material, which has been performed when the suspension wire is applied, becomes unnecessary, and the assembly operation becomes easier. Productivity is improved.

  As the elastomer material, a mass-produced thermoplastic elastomer (for example, a polyester elastomer) which can be designed to have a small spring constant and can be injection-molded is preferable. Polyester-based elastomers are excellent in heat resistance and low temperature properties, and have relatively stable flexibility even when the temperature changes.

  The side supports 31 and 32 are columnar members having a strength capable of supporting the OIS movable portion 10. In each of the four sides of the upper frame 33, two first side supports 31 or two second side supports 32 are disposed. The side supports 31 and 32 may be plate-like members covering the side of the OIS movable portion. The side supports 31 and 32 have a biaxial hinge structure that enables parallel movement in the plane orthogonal to the optical axis of the OIS movable unit 10 by bending around two axes.

  Specifically, the first side support 31 is formed to be thinner than the periphery, and has two Y hinge portions 31a and 31b whose axes are in the Y direction. Here, the Y hinges 31 a and 31 b are formed by hinge grooves formed on the outer surface of the first side support 31.

  The second side support 32 has the same shape as the first side support 31. That is, the second side support 32 has two X hinge portions 32a and 32b which are thinner than the periphery and extend in the X direction. Here, the X hinges 32 a and 32 b are formed by hinge grooves formed on the outer surface of the second side support 32.

  Although the shape of the hinge groove in the first side support 31 and the second side support 32 is not particularly limited, it is preferable to have an R shape. Thereby, the durability to the bending operation which is repeatedly performed at the time of the shake correction is improved.

  The first side support 31 is suspended at each end of two sides of the upper frame 33 along the Y direction. One end of the first side support 31 is fixed to the upper frame 33, and the other end is fixed to the OIS movable part 10 (here, the magnet holder 121).

  The second side supports 32 are suspended at respective ends of two sides of the upper frame 33 along the X direction. One end of the second side support 32 is fixed to the upper frame 33, and the other end is fixed to the OIS fixing portion 20 (here, the coil substrate 21).

  The upper frame 33 of the OIS link member 30 is bridged to the light receiving direction side of the OIS fixing portion 20 by the second side support 32. In addition, the OIS movable portion 10 is suspended from the upper frame 33 by the first side support 31.

  Therefore, when the OIS movable portion 10 moves in the X direction, only the second side support 32 elastically deforms, and the first side support 31 does not elastically deform. On the other hand, when the OIS movable portion 10 moves in the Y direction, only the first side support 31 elastically deforms, and the second side support 32 does not elastically deform. That is, the OIS movable unit 10 can move independently in the X direction and the Y direction.

  Thus, the OIS support portion 30 is opposed to the upper frame 33 disposed opposite to the OIS fixing portion 20 in the optical axis direction in the X direction (the first direction orthogonal to the optical axis direction). Are disposed, and are opposed to the first side support 31 connecting the upper frame 33 and the OIS movable unit 10, and in the Y direction (the second direction orthogonal to the optical axis direction and the first direction) It has a second side support 32 arranged, each connecting the upper frame 33 and the OIS fixing part 20. The first side support 31 has two Y hinge portions 31 a and 31 b formed thinner than the periphery and having the Y direction as an axis, and along with the movement of the OIS movable portion 10 in the X direction, The bending is performed so that the bending directions of the Y hinges 31a and 31b are opposite to each other (see FIG. 11). The second side support 32 has two X hinge portions 32 a and 32 b formed thinner than the periphery and having an axis in the X direction, and along with the movement of the OIS movable portion 10 in the Y direction, The bending is performed so that the bending directions of the X hinges 32a and 32b are opposite to each other (see FIG. 12).

  By adopting a mechanical hinge structure utilizing the elasticity of an elastomer as the OIS support portion 30, the OIS movable portion 10 can be moved with a small force, so power saving can be achieved. In addition, since the parallelism of the OIS movable portion 10 is secured, the tilt characteristic is improved.

  FIG. 6 is an exploded perspective view of the OIS movable portion 10. As shown in FIG. 6, the OIS movable unit 10 includes an AF movable unit 11, an AF fixing unit 12, an AF support unit 13, and the like. The AF movable portion 11 is disposed radially inward with respect to the AF fixing portion 12 and is connected to the AF fixing portion 12 by the AF supporting portion 13.

  The AF movable portion 11 is a portion having an AF coil portion constituting an AF voice coil motor, and moving in the optical axis direction at the time of focusing. The AF fixing unit 12 has an AF magnet unit that constitutes an AF voice coil motor, and is a portion that supports the AF movable unit 10 via the AF support unit 13. That is, a moving coil system is adopted for the AF drive unit of the lens drive device 1.

  The AF movable unit 11 has a lens holder 111 and an AF coil unit 112.

  The lens holder 111 is a substantially square member in a plan view, and the lens portion 2 is fixed to the cylindrical lens housing portion 111a by adhesion or screwing. The lens holder 111 has a coil attachment portion 111b on the side surface along the X direction. The lens holder 111 has link attachment portions 111c on two side surfaces along the Y direction. The lens holder 111 has a flange 111 d projecting outward in the radial direction on the circumferential surface of the lens housing portion 111 a. Further, on one side surface of the lens holder 111 along the Y direction, a sensor substrate 114 mounted with a position detection unit 113 (for example, a Hall element) for detecting the position of the AF movable unit 11 in the optical axis direction is disposed.

  The AF coil unit 112 is an air-cored coil that is energized when focusing, and is wound around the coil attachment portion 111 b of the lens holder 111. Both ends of the AF coil unit 112 are connected to the sensor substrate 114. The AF coil unit 112 has an oval shape, and is disposed such that the XZ plane is a coil plane here so that the coil plane is parallel to the optical axis. The AF coil unit 112 faces the magnet unit 122 (first magnet 122A).

  The AF support portion 13 supports the AF movable portion 11 with respect to the AF fixing portion 12. In the present embodiment, a link member formed of an elastomeric material is employed as the AF support portion 13 in the same manner as the OIS link member 30 instead of the conventional plate spring (hereinafter referred to as “AF link member 13 ")). The AF link member 13 is disposed to the side of the lens holder 111, and supports the lens holder 111 in a cantilever state.

  The AF link member 30 has a magnet holder fixing portion 131 and two arms 132.

  The arm 132 has a curved shape along the circumferential surface of the lens holder housing portion 111a. Each arm 132 has an upper arm 132A and a lower arm 132B. The proximal ends (fixed ends) of the upper arm 132A and the lower arm 132B are connected to the magnet holder fixing portion 131, and are indirectly fixed to the AF fixing portion 12. The tips (free ends) of the upper arm 132A and the lower arm 132B are connected by a lens holder fixing portion 132C. A flange accommodation space is formed by the upper arm 132A and the lower arm 132B.

  The upper arm 132A and the lower arm 132B have a biaxial hinge structure that enables parallel movement of the AF movable portion 11 by bending around two axes. By adopting the mechanical hinge structure utilizing the elasticity of the elastomer, the AF movable portion 11 can be moved with a small force, so power saving can be achieved.

  Specifically, the upper arm 132A and the lower arm 132B are formed thinner than the periphery and have two hinge portions 132a and 132b whose axes are in the X direction. Here, the hinge portions 132a and 132b are formed by hinge grooves formed on the outer surfaces of the upper arm 132A and the lower arm 132B. The shape of the hinge groove is not particularly limited, but it is preferable to have an R shape.

  As described above, the AF support portion 13 includes the magnet holder fixing portion 131 (side wall) disposed on the autofocus fixing portion 12 on the side of the AF movable portion 11, the magnet holder fixing portion 131, and the AF movable portion. And two arms 132 for connecting 11 in a cantilever state. The arm 132 has two hinge portions 132a and 132b each formed thinner than the periphery and having an axis in the X direction (direction orthogonal to the optical axis direction), and the movement of the AF movable portion 11 in the optical axis direction As a result, the bending directions of the two hinge portions 132a and 132b bend so as to be opposite to each other (see FIG. 13). This improves the durability against the bending operation that is repeatedly performed at the time of autofocusing.

  FIG. 7 is a three-sided view showing an attachment state of the AF support portion 13 and the AF movable portion 11. 7A is a plan view, FIG. 7B is a left side view, and FIG. 7C is a front view. As shown in FIG. 7, the lens holder 111 is disposed such that the flange portion 111 d is positioned in the flange accommodation space of the arm 132, and the lens holder fixing portion 132 C of the AF link member 13 is fixed to the link attachment portion 111 d. .

  Since the AF link member 13 is disposed close to the side surface of the lens holder 111, the size of the lens drive device 1 in a plan view can be suppressed, and the AF movable portion 11 can be supported in a stable state.

  The arm 132 functions as a restricting portion that restricts the movement of the AF movable portion 11 in the optical axis direction. That is, when the AF movable portion 11 moves to the light receiving direction in the optical axis direction, the upper surface of the flange 111d abuts on the upper arm 132A, thereby restricting further movement. That is, the distance from the flange 111 d to the upper arm 132 </ b> A is the movable range to the light receiving direction of the AF movable portion 11. Further, when the AF movable portion 11 moves to the imaging side in the optical axis direction, the lower surface of the flange 111d abuts on the lower arm 132B, thereby restricting further movement. That is, the distance from the flange 111d to the lower arm 132B is the movable range of the AF movable portion 11 toward the image forming direction in the optical axis direction.

  As shown in FIG. 6, the AF fixing unit 12 has a magnet holder 121 and a magnet unit 122.

  The magnet unit 122 has a first magnet 122A and a second magnet 122B. The first magnet 122 </ b> A and the second magnet 122 </ b> B are rectangular permanent magnets (reference numerals are omitted) having four poles on both sides. That is, in the first magnet 122A and the second magnet 122B, the N pole and the S pole appear equally on all six surfaces. The first magnet 122 </ b> A is disposed along the X direction so as to face the AF coil unit 112. The second magnet 122B is disposed along the Y direction.

  The sizes and positions of the AF coil unit 122 and the first magnet 122A are set such that magnetic fields in mutually opposite directions in the Y direction cross the two long sides in the AF coil unit 112. As a result, when the AF coil unit 122 is energized, Lorentz forces in the same direction are generated in the Z direction at the two long side portions of the AF coil unit 122.

  As described above, the first magnet 122A (the magnet unit for AF) has a rectangular parallelepiped shape with four poles on both sides, and is disposed along the X direction (the first direction orthogonal to the optical axis direction). The coil portion for AF 112 has an oval shape, and the coil surface faces the first magnet 122A, and the two long side portions are arranged so that the magnetic flux from the first magnet 122A crosses in the opposite direction. Be done. The AF support portion 13 supports the AF movable portion 11 from the opposite side to the AF coil portion 112.

  The first magnet 122 </ b> A and the AF coil unit 112 constitute an AF voice coil motor. A voice coil motor for OIS is configured by the first magnet 122A, the second magnet 122B, and the OIS coil unit 211 (see FIG. 11). That is, the first magnet 122A doubles as the AF magnet unit and the OIS magnet unit.

  The first magnet 122A and the second magnet 122B are used to detect the position of the OIS movable unit 10 in the plane orthogonal to the optical axis. The second magnet 122B is used to detect the position of the AF movable portion 11 in the optical axis direction.

  The magnet holder 121 is a square cylinder having a substantially square shape in a plan view having a space capable of accommodating the AF movable portion 11. The magnet holder 121 has a magnet housing portion 121a on one surface along the X direction, and has a magnet housing portion 121b on one surface along the Y direction. The first magnet 122A is disposed in the magnet housing portion 121a, and the second magnet 122B is disposed in the magnet housing portion 121b.

  The magnet holder 121 has an AF link fixing portion 121c on the other surface along the X direction. The magnet holder fixing portion 131 of the AF link member 13 is fixed to the AF link fixing portion 121c.

  The magnet holder 121 has an OIS link fixing portion 121d at each end (four places in total) of two sides along the Y direction. The first side support 31 of the OIS link member 30 is fixed to each of the OIS link fixing parts 121d.

  FIG. 8 is an exploded perspective view of the OIS fixing portion 20. As shown in FIG. As shown in FIG. 8, the OIS fixing unit 20 includes a coil substrate 21, a sensor substrate 22, a base 23 and the like.

  The coil substrate 21 is a square substrate in plan view, and has a circular opening 21 a at the center. The coil substrate 21 has an OIS coil portion 211 at a position facing the magnet portion 122 in the optical axis direction. The OIS coil unit 211 includes a first OIS coil 211A and a second OIS coil 211B corresponding to the first magnet 122A and the second magnet 122B. The first OIS coil 211A has an oval shape, and the coil surface is opposed to the surface on the imaging side in the optical axis direction of the first magnet 122A, and the two long side portions are from the first magnet 122A. The magnetic flux is arranged to cross in the opposite direction. The second OIS coil 122B has an oval shape, and the coil surface faces the surface on the imaging side in the optical axis direction of the second magnet 122B, and the two long side portions are from the second magnet 122B. The magnetic flux is arranged to cross in the opposite direction.

  The sizes and positions of the OIS coil unit 211 and the magnet unit 122 are set such that magnetic fields opposite to each other in the Z direction cross the two long sides in each of the OIS coils 211. As a result, when the OIS coil unit 211 is energized, Lorentz forces in the same direction in the X direction or Y direction are generated in the two long side portions of the OIS coil unit 211.

  The sensor substrate 22 is a square substrate in plan view, like the coil substrate 21, and has a circular opening 22 a at the center. The sensor substrate 22 includes a power supply line (not shown) for supplying power to the AF coil unit 112, the OIS coil unit 211, and the position detection unit 24, and a signal line for detection signals output from the position detection unit 24 Not shown) and the like.

  The position detection unit 24 is mounted on the sensor substrate 22. The position detection unit 24 is, for example, a Hall element that detects a magnetic field using the Hall effect (hereinafter referred to as “Hall element 24”). The Hall elements 24 are disposed substantially at the center of each of two adjacent sides of the sensor substrate 22. The position of the OIS movable portion 10 in the plane orthogonal to the optical axis can be specified by detecting the magnetic field mainly formed by the magnet portion 122 with the Hall element 24. In addition to the magnet unit 122, a position detection magnet may be disposed on the OIS movable unit 10.

  The base 23 is a square-shaped member in plan view similarly to the coil substrate 21 and has a circular opening 23 a at the center. The base 23 has an upright wall 23b at the periphery of the opening 23a. The coil board 21 and the sensor board 22 are positioned with respect to the base 23 by the rising wall 23 b.

  Here, as shown in FIG. 9, the first OIS coil 211A and the second OIS coil 211B extend the elongated upper coil layer 211a (first coil layer) and the upper coil layer 211a. It has a two-layer structure composed of a lower coil layer 211b (second coil layer) divided into two in the direction. The upper coil layer 211a and the lower coil layer 211b are formed of, for example, one winding, and the direction of the flowing current is the same. The upper coil layer 211a and the lower coil layer 211b may be formed by different windings. In this case, wiring is performed so that the directions of the flowing current are the same. The Hall element 24 is disposed at a position corresponding to the divided portion of the lower coil layer 211b. The “position corresponding to the divided portion” includes, of course, a position between the divided portions and a position shifted in the optical axis direction from the divided portions.

  As shown in FIG. 10, when the current I in the arrow direction flows in the upper coil layer 211a and the lower coil layer 211b, the magnetic field B1 by the upper coil layer 211a crosses the Hall element 24 from the bottom to the top. On the other hand, the magnetic field B2 generated by the lower coil layer 211b traverses the Hall element 24 from the top to the bottom. Therefore, the magnetic field formed around the Hall element 24 by the upper coil layer 211a and the lower coil layer 211b is offset.

  As a result, even when magnetic flux is generated in the OIS coil portion 211 when the OIS coil portion 211 is energized, the magnetic flux incident on the Hall element 24 is reduced, so the OIS coil portion 211 for the Hall element 24 The influence of the magnetic field due to That is, electrical resonance is suppressed, and further, even when feedback control is performed at 150 to 200 Hz, the gain in the low frequency band is improved. Therefore, the detection sensitivity by the Hall element 24 is improved, the settling time of the OIS drive section is shortened, and the accuracy of shake correction is also improved.

  Further, since the upper coil layer 211a is not divided, a large Lorentz force is generated in the OIS coil portion 211 as compared with the case where the entire OIS coil portion 211 is divided. Therefore, the sensitivity of shake correction is also improved.

  In the lens drive device 1, when the OIS coil unit 211 is energized, Lorentz force is generated in the OIS coil unit 211 by the interaction between the magnetic field of the magnet unit 122 and the current flowing through the OIS coil unit 211 (Fleming left hand law ). The direction of the Lorentz force is a direction (Y direction or X direction) orthogonal to the direction of the magnetic field (Z direction) and the direction (X direction or Y direction) of the current flowing in the long side portion of the OIS coil portion 211.

  Since the OIS coil unit 211 is fixed, a reaction force acts on the magnet unit 122. This reaction force becomes a driving force of the voice coil motor for OIS, and the OIS movable portion 10 having the magnet portion 122 swings within the XY plane, and shake correction is performed. Specifically, based on the detection signal indicating the angular shake from the shake detection unit (for example, a gyro sensor, not shown) so that the angular shake of the camera module A is offset, the conduction current of the shake correction coil unit 211 Is controlled. At this time, by feeding back the detection result of the position detection unit 24, the translational movement of the OIS movable unit 10 can be accurately controlled.

  When a force in the X direction is applied to the OIS movable portion 10 by energizing the OIS coil portion 211 as shown in FIG. 11A, as shown in FIG. 11B, the first side support of the OIS link member 30 31 bends. That is, as shown in FIG. 11B, the portion of the first side support 31 located below the Y hinge portion 31b moves in the X direction together with the OIS movable portion 10 (magnet holder 121), but the Y hinge portion The portion located above 31 a does not move because it is indirectly connected to the OIS fixing portion 20 via the upper frame 33 and the second side support 32. Therefore, the first side support 31 is bent such that the bending direction in the Y hinges 31a and 31b is reverse.

  On the other hand, when a force in the Y direction acts on the OIS movable portion 10 by energizing the OIS coil portion 211 as shown in FIG. 12A, as shown in FIG. 11B, the second side portion of the OIS link member 30. The support 32 is bent. That is, a portion of the second side support 32 located above the X hinge portion 32a moves in the Y direction together with the OIS movable portion 10 (magnet holder 121), but a portion located below the X hinge portion 32b Since it is connected to the base 23 of the OIS fixing unit 20, it does not move. Therefore, the second side support 32 is bent such that the bending direction in the X hinges 32a and 32b is reverse.

  In the lens drive device 1, when the AF coil unit 112 is energized, Lorentz force is generated in the AF coil unit 112 due to the interaction between the magnetic field of the first magnet 122 A and the current flowing through the AF coil unit 112. The direction of the Lorentz force is a direction (Z direction) orthogonal to the direction of the magnetic field (Y direction) and the direction of the current flowing through the AF coil unit 112 (X direction). This force is the driving force of the AF voice coil motor, and the AF movable unit 11 having the AF coil unit 112 moves in the optical axis direction, and focusing is performed. The in-focus position is adjusted, for example, by analyzing a plurality of pieces of image information acquired by the imaging unit (not shown) while moving the AF movable unit 11 and performing contrast evaluation.

  In addition, at the time of non-energization which does not perform focusing, the AF movable part 11 is hold | maintained by the link member 13 for AF in the state (it calls a "reference state" hereafter) suspended between infinity position and a macro position. Ru. That is, in the OIS movable portion 10, the AF movable portion 11 (lens holder 111) is displaced to both sides in the Z direction with the AF link member 13 positioned relative to the AF fixing portion 12 (magnet holder 121). Possible support. When focusing, the direction of the current is controlled according to whether the AF movable unit 11 is moved from the reference state to the macro position side or to the infinity position side. Further, the magnitude of the current is controlled in accordance with the movement distance of the AF movable portion 11.

  When a force in the Z direction is applied to the AF movable portion 11 by energizing the AF coil portion 112 as shown in FIG. 13A, the arm 132 of the AF link member 13 is bent as shown in FIG. 13B. That is, as shown in FIG. 13B, the portion of the arm 132 located to the left of the hinge portion 132b moves in the Z direction together with the AF movable portion 11, but the portion located to the right of the hinge portion 132a is a magnet holder As it is connected to the AF fixing unit 12 via the fixing unit 131, it does not move. Therefore, the arm 132 is bent such that the bending direction in the hinge portions 132a and 132b is opposite.

  As described above, the lens drive device 1 includes the magnet unit 122 (vibration correction magnet unit) disposed around the lens unit 2 and the OIS coil unit 211 (for vibration correction) disposed away from the magnet unit 122. The OIS movable unit 10 (shake correction movable unit) including the magnet unit 122 is supported in a state of being separated in the optical axis direction with respect to the OIS fixed unit 20 (shake correction fixed unit) including the coil unit) and the OIS coil unit 211 Using the driving force of the voice coil motor formed of the OIS coil unit 211 and the magnet unit 122, and the OIS fixing unit 20 with the OIS supporting unit 30 (vibration correction supporting unit). A shake correction drive unit is provided that performs shake correction by swinging the movable unit 10 in a plane orthogonal to the optical axis direction. The OIS movable portion 10 includes an AF coil portion 112 (autofocus coil portion) disposed around the lens portion 2 and a first magnet disposed radially apart from the AF coil portion 112. The AF movable portion 11 (autofocus movable portion) including the AF coil portion 112 is supported on the AF fixing portion 12 (autofocus fixed portion) including the first magnet 122A and the first magnet 122A. The driving force of a voice coil motor, which has an AF support 13 (a support for autofocus) and is constituted by the AF coil 112 and the first magnet 122A, is used for the AF fixing unit 12 And an auto-focusing drive unit for automatically focusing by moving the AF movable unit 11 in the optical axis direction. The OIS support portion 30 is formed of an elastomeric material and has a biaxial hinge structure that supports the OIS movable portion 10 movably in a plane perpendicular to the optical axis, and the AF support portion 13 is formed of an elastomeric material The AF movable portion 11 has a biaxial hinge structure so as to be movable in the optical axis direction.

  According to the lens drive device 1, the risk of damage to the OIS support portion 30 and the AF support portion 13 due to an impact such as a drop is extremely reduced. Further, the structure is simple and the number of parts is small as compared with the prior art. Therefore, high reliability can be ensured, OIS sensitivity can be enhanced, and assembly work can be facilitated.

  As mentioned above, although the invention made by the present inventor was concretely explained based on an embodiment, the present invention is not limited to the above-mentioned embodiment, and can be changed in the range which does not deviate from the gist.

  For example, the OIS support portion 30 and the AF support portion 13 may be formed of an elastomeric material and have a biaxial hinge structure, and are not limited to the support structure described in the embodiment.

  Further, for example, the position detection unit 24 that detects the position of the OIS movable unit 10 in the optical axis orthogonal plane may be mounted on the coil substrate 21 as shown in FIG. 14. In this case, the first OIS coil 211A and the second OIS coil 211B have a structure divided in the longitudinal direction, and the Hall elements are arranged in the divided portions and fixed by molding. The coil substrate 21 includes a power supply line (not shown) for feeding power to the AF coil unit 112, the OIS coil unit 211, and the position detection unit 24, and a signal line for detection signals output from the position detection unit 24 Not shown) and the like.

  As in the embodiment, the Hall element 24 mounted on the sensor substrate 22 is packaged (so-called Hall IC). On the other hand, in the example shown in FIG. 14, since the wiring pattern and the land are formed on the coil substrate 21 and the Hall element 24 is mounted as a chip, the height can be reduced compared to the case of mounting a Hall IC. be able to. In addition, the coil substrate 21 can easily embed the Hall element 24 in the coil substrate 21 and can easily form a complicated wiring pattern by using the laminated structure.

  In the embodiment, a smartphone as a camera-equipped mobile terminal is described as an example of a camera-equipped device provided with a camera module A, but the present invention can be applied to a camera-equipped device as an information device or a transport device. The camera-mounted device, which is an information device, is an information device having a camera module and a control unit that processes image information obtained by the camera module. For example, a camera-equipped mobile phone, a notebook computer, a tablet terminal, a portable game machine , Webcam, in-vehicle device with camera (for example, back monitor device, drive recorder device). In addition, a camera mounted device which is a transportation device is a transportation device having a camera module and a control unit that processes an image obtained by the camera module, and includes, for example, a car.

  FIG. 12 is a view showing an automobile V as a camera mounted device mounted with a camera module VC (Vehicle Camera). 12A is a front view of the automobile V, and FIG. 12B is a rear perspective view of the automobile V. The automobile V mounts the camera module A described in the embodiment as an on-vehicle camera module VC. As shown in FIG. 12, the on-vehicle camera module VC is, for example, attached to the windshield toward the front or attached to the rear gate toward the rear. The on-vehicle camera module VC is used as a back monitor, a drive recorder, a collision avoidance control, an automatic driving control, and the like.

  It should be understood that the embodiments disclosed herein are illustrative and non-restrictive in every respect. The scope of the present invention is indicated not by the above description but by the claims, and is intended to include all the modifications within the meaning and scope equivalent to the claims.

1 lens drive device 2 lens portion 3 cover 10 OIS movable portion (shake correction movable portion)
11 AF movable part (Auto focus movable part)
111 lens holder 112 AF coil part (autofocus coil part)
12 AF fixed part (Auto focus fixed part)
121 Magnet Holder 122 Magnet Part 122A First Magnet (Auto Focus Magnet Part, Shake Correction Magnet Part)
122B Second magnet (Magnet part for shake correction)
13 AF support, AF link member (shake correction support)
131 Magnet holder fixing part (side wall)
132 arm 132a, 132b hinge part 20 OIS fixing part (shake correction fixing part)
21 coil substrate 211 coil portion for OIS 211A first OIS coil 211B second OIS coil 211a upper coil layer (first coil layer)
211b Lower coil layer (second coil layer)
22 sensor substrate 23 base 24 position detection unit, hall element 30 support unit for OIS, link member for OIS (support unit for shake correction)
31 first side support 31a, 31b Y hinge 32 second side support 32a, 32b X hinge 33 upper frame A camera module M smart phone (camera mounted device)

Claims (4)

A shake correction fixing unit including the shake correction coil unit, including a shake correction magnet unit disposed around the lens unit, and a shake correction coil unit spaced apart from the shake correction magnet unit. A shake correction drive unit for swinging the shake correction movable unit including the shake correction magnet unit with respect to the unit in a plane orthogonal to the optical axis direction;
The shake correction movable portion includes an autofocusing coil portion disposed around the lens portion, and an autofocusing magnet portion disposed radially apart from the autofocusing coil portion. An autofocus drive unit for moving an autofocus movable unit including the autofocus coil unit relative to an autofocus fixed unit including the autofocus magnet unit in an optical axis direction;
The shake correction magnet unit includes two shake correction magnets disposed on two orthogonal sides of four sides defining a rectangle in a plane orthogonal to the optical axis direction,
The lens drive device, wherein the autofocus magnet unit is configured of at least one of the shake correction magnets. The particular shake correction magnet, which doubles as the shake correction magnet unit and the autofocus magnet unit, has a rectangular parallelepiped shape with four poles on both sides,
The coil portion for autofocus has an oval shape, and the coil surface faces the specific shake correction magnet, and the magnetic flux from the specific shake correction magnet crosses in the opposite direction of the two long side portions The lens driving device according to claim 1, which is arranged as follows. The lens unit;
The lens drive device according to claim 1 or 2, and a camera module. A camera mounted device that is an information device or transport device, and
The camera mounting apparatus provided with the camera module of Claim 3.

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