Drive unit, camera module, and camera mount device

Abstract

To provide a drive unit, a camera module, and a camera mount device capable of improving urging force to a housing section in a lens holder.SOLUTION: A drive unit has a lens holder for holding a lens, a housing section for housing the lens holder, a coil section provided in one of the lens holder and the housing section, and a drive magnet section provided in the other of the lens holder and the housing section, and also has a drive section for driving the lens holder in the direction of a light axis relative to the housing section, and an urging section for urging the lens holder to the housing section, and the urging section is disposed opposite a first section of the drive magnet section, and has an urging yoke magnetically attracted by the first section, and an urging magnet that faces a second section of the drive magnet section and is disposed in a side for attracting the urging yoke to the first section so as to magnetically repel against the second section.SELECTED DRAWING: Figure 13

Description

[Technical Field]

[0001] The present invention relates to a driving device, a camera module, and a camera-mounted device. [Background technology]

[0002] Generally, mobile terminals such as smartphones are equipped with small camera modules. Such camera modules are equipped with a driving device that has an autofocus function (hereinafter referred to as the "AF function" or "AF: Auto Focus") that automatically performs autofocus when photographing a subject, and an image stabilization function (hereinafter referred to as the "OIS function" or "OIS: Optical Image Stabilization") that optically corrects shake (vibration) that occurs during photography to reduce image distortion.

[0003] A drive device with AF and OIS functions includes an autofocus drive unit (hereinafter referred to as the "AF drive unit") for moving the lens unit in the optical axis direction, and an image stabilization drive unit (hereinafter referred to as the "OIS drive unit") for oscillating the lens unit or the image sensor in a plane perpendicular to the optical axis. A commonly known drive device configuration uses a voice coil motor (VCM) in the AF drive unit and the OIS drive unit.

[0004] In addition, in the configuration described in Patent Document 1, the posture of the lens holder (AF movable part) is stabilized by the magnetic attraction force between a yoke arranged on the end face of the drive magnet and a position detection magnet arranged near the end of the drive magnet. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2016 / 6168 Summary of the Invention [Problem to be solved by the invention]

[0006] Incidentally, in order to further stabilize the attitude of the lens holder, it is desirable to have a configuration in which the biasing force applied to the portion of the lens holder that houses the lens holder (housing portion) is further improved.

[0007] An object of the present invention is to provide a drive device, a camera module, and a camera-mounted device that can further improve the biasing force applied to the housing portion in the lens holder. [Means for solving the problem]

[0008] The drive device according to the present invention comprises: a lens holder for holding a lens; a housing portion that houses the lens holder; a drive unit including a coil unit provided on one of the lens holder and the housing unit, and a drive magnet unit provided on the other of the lens holder and the housing unit, and configured to drive the lens holder in the optical axis direction relative to the housing unit; a biasing portion that biases the lens holder to the accommodation portion; Equipped with The biasing portion is a biasing yoke disposed opposite to the first portion of the drive magnet portion and magnetically attracted to the first portion; an urging magnet that faces the second portion of the drive magnet unit and is disposed on the side of the urging yoke that is attracted to the first portion so as to magnetically repel the second portion; It has.

[0009] The camera module according to the present invention comprises: The drive device; an element portion including the lens; an imaging unit including an imaging element that captures a subject image formed by the element unit; Equipped with.

[0010] The camera-equipped device according to the present invention comprises: A camera-equipped device that is an information device or a transportation device, The above camera module, an imaging control unit that processes image information obtained by the camera module; Equipped with. [Effects of the Invention]

[0011] According to the present invention, the biasing force of the lens holder to the housing portion can be further improved. [Brief explanation of the drawings]

[0012] [Figure 1A] FIG. 1 is a diagram showing a smartphone equipped with a camera module. [Figure 1B] FIG. 1 is a diagram showing a smartphone equipped with a camera module. [Figure 2] FIG. 2 is an external perspective view of the camera module. [Figure 3] FIG. 2 is a perspective view showing a state in which the cover of the drive unit is removed. [Figure 4] FIG. 2 is an exploded perspective view showing a schematic configuration of a drive device. [Figure 5] FIG. 2 is an exploded perspective view showing the detailed configuration of the AF unit. [Figure 6] FIG. 2 is a view of the driving device as seen from the optical axis direction. [Figure 7] FIG. 2 is an exploded perspective view showing the detailed configuration of the AF unit. [Figure 8] FIG. [Figure 9] FIG. 2 is an exploded perspective view showing the detailed configuration of the OIS unit. [Figure 10] 10A and 10B are diagrams illustrating a rolling member portion of the OIS unit. [Figure 11] FIG. 2 is an exploded perspective view showing the detailed configuration of the OIS unit. [Figure 12] FIG. 2 is a view of the image sensor substrate as seen from the optical axis direction. [Figure 13] 10A and 10B are diagrams for explaining the positional relationship between a biasing portion and a drive magnet. [Figure 14] 4A and 4B are diagrams illustrating the magnetic relationship between a position detection magnet and an AF magnet. [Figure 15] FIG. 2 is a view of the circuit board as seen from the optical axis direction. [Figure 16] FIG. 10 is a diagram illustrating the thickness of a circuit board. [Figure 17] 10A and 10B are diagrams illustrating a power supply wiring board according to a modified example. [Figure 18A] FIG. 1 is a diagram showing a car equipped with a camera module. [Figure 18B] FIG. 1 is a diagram showing a car equipped with a camera module. DETAILED DESCRIPTION OF THE INVENTION

[0013] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0014] 1A and 1B are diagrams showing a smartphone M (an example of a camera-equipped device) equipped with a camera module A according to an embodiment of the present invention, in which Fig. 1A is a front view of the smartphone M and Fig. 1B is a rear view of the smartphone M.

[0015] In this embodiment, the camera module A is applied to the rear camera OC1 of the smartphone M. The camera module A has an AF function and an OIS function, and can automatically perform autofocus when photographing a subject, and can also optically correct shake (vibration) that occurs during photography to capture images without image blur.

[0016] Fig. 2 is an external perspective view of the camera module A. As shown in Fig. 2, this embodiment will be described using a Cartesian coordinate system (X, Y, Z). The same Cartesian coordinate system (X, Y, Z) will also be used in the drawings described below. Furthermore, the intermediate directions that form 45° with the X direction and the Y direction, i.e., the diagonal directions in the planar view of the camera module A when viewed from the optical axis direction, will be described as the U direction and the V direction.

[0017] When actually taking a photo with the smartphone M, the camera module A is mounted so that the X direction is the up-down direction (or left-right direction), the Y direction is the left-right direction (or up-down direction), and the Z direction is the front-to-back direction. That is, the Z direction is the optical axis direction, and the upper side in the drawing is the optical axis direction light receiving side (also called the "macro position side"), and the lower side is the optical axis direction image forming side (also called the "infinity position side"). The X and Y directions perpendicular to the Z axis are called "directions perpendicular to the optical axis."

[0018] The camera module A includes a drive device 1 that realizes the AF function and the OIS function, a lens unit (not shown) in which a lens is housed in a cylindrical lens barrel, and a shield cover 2 that covers the entire module.

[0019] The lens unit (not shown) is accommodated in a lens holder having a cylindrical inner peripheral surface as a lens accommodation portion. The inner wall surface of the lens holder is provided with a groove to which, for example, an adhesive is applied, and the lens unit is screwed into this groove to fix the lens unit to the lens holder, thereby holding the lens unit in the lens holder.

[0020] As shown in FIG. 3, the outside of the drive unit main body (reference numeral omitted) of the drive unit 1 is covered with a shield cover 2. The shield cover 2 is a rectangular, covered square cylinder in a plan view from the optical axis direction, and has an opening 21 on its top surface. The lens portion faces the outside through this opening 21. The shield cover 2 is fixed to the base of the drive unit 1, for example, by adhesive. That is, the drive unit 1 has a rectangular shape extending in the X and Y directions in a plan view from the optical axis direction. In the following description, "plan view" means a plan view from the optical axis direction.

[0021] Fig. 4 is an exploded perspective view showing the schematic configuration of the drive device 1. Figs. 5 and 7 are exploded perspective views showing the detailed configuration of the drive device 1. Figs. 6 and 8 are enlarged views of the support portion of the drive device 1 (AF unit section 11). Note that the shield cover 2 is omitted in Figs. 4 to 8.

[0022] Functionally, as shown in FIG. 4, the drive unit 1 includes an OIS movable part M1, an OIS fixed part F1, an OIS drive part D1, an OIS support part S1, an AF movable part M2, an AF fixed part F2, an AF drive part D2, and an AF support part S2.

[0023] The OIS movable part M1 is a part that receives the driving force of the OIS driving part D1 during shake correction and swings in a plane perpendicular to the optical axis, and in this embodiment is made up of the image sensor substrate 123.

[0024] The OIS fixed portion F1 is a portion that supports the OIS movable portion M1, and in this embodiment is configured by a base 121. The OIS fixed portion F1 is disposed, for example, at a distance from the OIS movable portion M1 on the imaging side in the optical axis direction.

[0025] The OIS support part S1 is a part interposed between the OIS movable part M1 and the OIS fixed part F1, and supports the OIS movable part M1 so that it can swing in a plane perpendicular to the optical axis. In this embodiment, the OIS support part S1 is composed of a rolling member 125 arranged on the base 121.

[0026] The OIS driving unit D1 is composed of an OIS coil 124 arranged in the OIS movable unit M1 and a driving magnet 114 (OIS magnet) arranged in the AF fixed unit F2. That is, a moving coil voice coil motor is applied to the OIS driving unit D1. The OIS driving unit D1 may also be composed of a moving magnet voice coil motor.

[0027] The AF movable part M2 is a part that receives the driving force of the AF driving part D2 and moves in the optical axis direction during autofocusing, and is made up of a lens holder 111 in this embodiment.

[0028] The AF fixed part F2 is a part that supports the AF movable part M2, and in this embodiment is configured by a magnet holder 113. The AF fixed part F2 is disposed, for example, radially outwardly and spaced apart from the AF movable part M2.

[0029] The AF support part S2 is a part interposed between the AF movable part M2 and the AF fixed part F2, and is made up of a rolling member 117 in this embodiment.

[0030] The AF driving unit D2 is a part that drives the AF movable unit M2 during autofocusing, and in this embodiment is composed of an AF coil 112 arranged in the AF movable unit M2 and a driving magnet 114 (AF magnet) arranged in the AF fixed unit F2. That is, a moving coil type voice coil motor is applied to the AF driving unit D2 in this embodiment. Note that the AF driving unit D2 may also be composed of a moving magnet type voice coil motor.

[0031] A guaranteed stroke, which indicates the degree to which shake correction can be performed appropriately, is defined for the drive unit 1. That is, the shapes, sizes, strengths, etc. of the constituent members of the OIS movable part M1, OIS fixed part F1, OIS drive part D1, and OIS support part S1 are set so as to realize the guaranteed stroke.

[0032] Structurally, the drive device 1 has an AF unit section 11 and an OIS unit section 12.

[0033] 5, the AF unit 11 is a part that has the above-mentioned AF movable part M2, AF fixed part F2, part of the AF drive part D2, and AF support part S2. The AF unit 11 has a lens holder 111, an AF coil 112, a magnet holder 113, a drive magnet 114, and a power supply member 115.

[0034] The lens holder 111 has a substantially rectangular shape in a plan view, and has a cylindrical inner peripheral surface as a lens housing portion. A groove into which, for example, an adhesive agent is applied is provided on the inner wall surface of the lens holder 111. The lens portion is held by the lens holder 111 by screwing the lens portion into this groove and fixing the lens portion to the lens holder 111.

[0035] An AF coil 112 is disposed on the outer peripheral surface of the lens holder 111. For example, the AF coil 112 is provided on the lens holder 111 by being wound around the outer peripheral surface. The AF coil 112 is an air-core coil that is energized during autofocusing, and is wound around the outer peripheral surface of the lens holder 111. Both ends of the AF coil 112 are wound around winding portions (not shown) of the lens holder 111. The current flowing through the AF coil 112 is controlled by a control IC (Integrated Circuit) (not shown). The control IC is disposed on the image sensor board 123, for example.

[0036] Two of the four rectangular corners of the lens holder 111 are provided with holes 111A that penetrate in the Z direction. As shown in FIG. 6, these two corners are located on one of two diagonals of the rectangular shape of the lens holder 111 that is along the U direction. The U direction is a direction that approaches the + side of the Y direction as it moves toward the + side of the X direction. The V direction, along which a diagonal line different from the diagonal line along the U direction runs, is a direction that approaches the + side of the Y direction as it moves toward the - side of the X direction.

[0037] Protrusion 116B of magnet holder 113 is inserted into hole 111A. A first groove 111B recessed toward the +V side is provided in the wall surface of hole 111A on the +V side in the V direction.

[0038] 7, the lens holder 111 is provided with a position detection magnet 111C for detecting the position of the lens holder 111 in the Z direction. The position detection magnet 111C is arranged at one of the four corners of the rectangle of the lens holder 111. The corner where the position detection magnet 111C is located is located on the positive side of the V direction, of the two diagonals of the rectangular shape of the lens holder 111, which is along the V direction (see also FIG. 6).

[0039] Specifically, position detection magnet 111C is fixed to magnet fixing portion 111D provided on lens holder 111. Position detection magnet 111C is magnetized so that the north pole is on the center side (inside) of lens holder 111 and the south pole is on the opposite side (outside) of lens holder 111 from the center.

[0040] Furthermore, a biasing yoke 111E is provided at the corner (the corner on the negative side in the V direction) opposite to the corner where the position detection magnet 111C is located in the lens holder 111. In other words, the position detection magnet 111C is disposed on the opposite side to the biasing yoke 111E across the lens holding portion of the lens holder 111.

[0041] The biasing yoke 111E is fixed to a yoke fixing portion 111F provided on the lens holder 111. The yoke fixing portion 111F is provided so as to be recessed from the surface on the negative Z-direction side of the corner on the negative V-direction side of the lens holder 111, and is configured so that the biasing yoke 111E can be inserted therein.

[0042] Position detection magnet 111C and biasing yoke 111E function as a biasing portion for biasing lens holder 111 toward magnet holder 113 due to their relationship with drive magnet 114 held by magnet holder 113. Details of the biasing portion will be described later.

[0043] 5, magnet holder 113 is a storage section that stores lens holder 111, and is a holding member that has a generally rectangular tubular shape in a plan view with four connected side walls 113A. Magnet holder 113 has opening 113B that is cut out at a portion that corresponds to the generally rectangular outline of lens holder 111 in a plan view. Lens holder 111 is placed in this opening 113B, and thereby magnet holder 113 is placed so as to surround lens holder 111.

[0044] 7, the magnet holder 113 has magnet holding portions 113C on the inner side of each of the four side walls 113A. The drive magnet 114 is fixed to the magnet holding portions 113C. For example, the magnet holding portions 113C are provided with openings (reference numeral omitted) that communicate with the outside, so that an adhesive can be injected into the contact surface between the magnet holding portions 113C and the drive magnet 114.

[0045] The magnet holder 113 has a fixed portion 113D on the lower surface of the side wall 113A, to which the power supply member 115 is fixed.

[0046] The magnet holder 113 is provided with a biased portion 116 at each end in the U direction. The biased portion 116 is a portion that biases the lens holder 111 by the biasing portion, and one biased portion 116 is provided corresponding to each of the two holes 111A of the lens holder 111. The biased portion 116 has an extending portion 116A and a protruding portion 116B.

[0047] The extensions 116A are provided at two of the four corners of the rectangle of the magnet holder 113. The two corners are located on the diagonal line along the U direction out of two diagonals of the rectangular shape of the magnet holder 113 (see also FIG. 6).

[0048] The extension portion 116A extends from the bottom portion on the negative side in the Z direction of the magnet holder 113 toward the center of the magnet holder 113. When the lens holder 111 is assembled to the magnet holder 113 (AF unit portion 11), the extension portion 116A is located on the negative side in the Z direction of the hole 111A of the lens holder 111.

[0049] 8, the protrusion 116B is provided to protrude from the extension 116A toward the positive side in the Z direction. The protrusion 116B is located inside the hole 111A of the lens holder 111 when the lens holder 111 is attached to the magnet holder 113 (AF unit part 11).

[0050] Further, a second groove 116C recessed toward the + side in the V direction is provided on the wall surface on the negative side in the V direction of the protrusion 116B. As shown in Figures 6 and 8, the second groove 116C faces the first groove 111B of the hole 111A when the lens holder 111 is assembled to the magnet holder 113 (AF unit section 11). A rolling member 117 is disposed between the first groove 111B and the second groove 116C.

[0051] The rolling members 117 are spherical members interposed between the first groove 111B and the second groove 116C, and support the lens holder 111 when the lens holder 111 is urged against the urged portion 116 by the urging portion. One rolling member 117 is provided on the urged portion 116 on the + side in the U direction, and two rolling members 117 are provided on the urged portion 116 on the - side in the U direction. When the lens holder 111 is driven in the Z direction, the rolling members 117 slide while rolling between the first groove 111B and the second groove 116C. This allows the lens holder 111 to be driven smoothly.

[0052] 5 and 6, a substrate 118 is disposed on the magnet holder 113 at a portion facing the position-detecting magnet 111C. The substrate 118 is, for example, a flexible printed circuit board, and is connected to a substrate (not shown) that is connected to the control IC via terminal fittings or the like. The substrate 118 is also provided with a magnetic sensor (not shown). The magnetic sensor is configured with a Hall element, a TMR (Tunnel Magneto Resistance) sensor, or the like. The magnetic sensor detects the magnetic field of the position-detecting magnet 111C, thereby enabling the position of the lens holder 111 in the Z direction to be detected.

[0053] 5 and 7, the drive magnet 114 is fixed to the magnet holding portion 113C of each of the four side walls 113A of the magnet holder 113. In this embodiment, the drive magnet 114 has a substantially rectangular shape in a plan view.

[0054] Furthermore, drive magnets 114 are magnets for AF drive and OIS drive, and are arranged in a position facing but spaced apart from AF coil 112 while being fixed to magnet holding portion 113C. Four drive magnets 114 are provided surrounding lens holder 111, and each includes an AF magnet 114A and an OIS magnet 114B.

[0055] The AF magnet 114A is used to drive the lens holder 111 in the optical axis direction (Z direction), and together with the AF coil 112 constitutes a voice coil motor that functions as the AF drive unit D2. The AF magnet 114A is magnetized so as to form a magnetic field that crosses the AF coil 112 in the radial direction (U direction or V direction). Specifically, the AF magnet 114A is magnetized so that the north pole is located on the side facing the AF coil 112, and the south pole is located on the opposite side.

[0056] The OIS magnet 114B is used to drive the OIS unit 12 (described later) in a direction along the XY plane, and together with the OIS coil 124 (described later) constitutes a voice coil motor that functions as the OIS driver D1. The OIS magnet 114B is magnetized so as to form a magnetic field that crosses the OIS coil 124 in the optical axis direction. The OIS magnet 114B may be configured integrally with the AF magnet 114A.

[0057] The power supply member 115 electrically connects the magnet holder 113, which is the AF fixed part F2, and the lens holder 111, which is the AF movable part M2. The power supply member 115 is composed of two leaf springs made of, for example, titanium copper, nickel copper, stainless steel, or the like.

[0058] Power supply member 115 has first fixed portion 115A fixed to fixed portion 113D of magnet holder 113, second fixed portion 115B fixed to lens holder 111, and arm portion 115C connecting first fixed portion 115A and second fixed portion 115B. First fixed portion 115A and second fixed portion 115B are adhesively fixed to magnet holder 113 or lens holder 111, for example.

[0059] The first fixed portion 115A is electrically connected to the substrate 118, and the second fixed portion 115B is electrically connected to the entanglement portion to which the AF coil 112 is connected. As a result, the power supply member 115 forms a power supply path from the control IC to the AF coil 112 via the substrate 118 etc.

[0060] When autofocusing is performed in the camera module A, current is passed through the AF coil 112 of the AF unit 11. The current passing through the AF coil 112 is controlled by a control IC (not shown). This control is performed based on a control signal supplied from outside the camera module A and the detection results of a magnetic sensor built into or connected to the control IC.

[0061] In the AF unit 11, when the AF coil 112 is energized, a Lorentz force (Fleming's left-hand rule) is generated in the AF coil 112 due to the interaction between the magnetic field of the AF magnet 114A and the current flowing through the AF coil 112. The direction of the Lorentz force is the direction (Z direction) perpendicular to the direction of the magnetic field (X direction or Y direction) and the direction of the current flowing through the AF coil 112 (Y direction or X direction).

[0062] The direction of the magnetic field is set in advance so that the direction of the Lorentz force is the desired direction. Because AF magnet 114A is fixed, a reaction force acts on AF coil 112. This reaction force becomes the driving force for the voice coil motor, which is AF drive unit D1, and lens holder 111 having AF coil 112 and the lens unit housed in lens holder 111 move in the optical axis direction, thereby performing autofocus.

[0063] As shown in Fig. 4, OIS unit 12 is a part that has the above-mentioned OIS movable part M1, OIS fixed part F1, part of OIS drive part D1, and OIS support part S1. As shown in Fig. 9, OIS unit 12 has base 121, circuit board 122, image sensor board 123, and OIS coil 124.

[0064] The base 121 has a rectangular shape in a plan view. An external connection board 121A that can be connected to the outside of the camera module A is disposed on the base 121. The base 121 also has a recess 121B.

[0065] The recess 121B is a portion where the rolling members 125 are disposed, interposed between the image sensor substrate 123 and the base 121. The recess 121B is configured to be recessed toward the negative side in the Z direction from a portion of the base 121 that protrudes beyond the portion where the external connection substrate 121A is disposed (see also FIG. 10).

[0066] The recesses 121B are provided at three locations on the base 121: the negative end in the X direction and the negative end in the Y direction, the negative end in the X direction and the positive end in the Y direction, and the positive end in the X direction and the central portion in the Y direction.

[0067] The rolling members 125 are spherical members that are placed in the respective recesses 121 B. The rolling members 125 are interposed between the base 121 and the image sensor substrate 123 to support the image sensor substrate 123 .

[0068] The recesses 121B are configured in a rectangular shape larger than the rolling members 125, and when the image sensor substrate 123 oscillates within the XY plane, the rolling members 125 slide while rolling within each recess 121B, thereby enabling the image sensor substrate 123 to be driven smoothly.

[0069] 11, magnets 121C for magnetically attracting the image sensor substrate 123 are provided on the negative surface in the Z direction of the base 121. One magnet 121C is provided in each of three arrangement portions 121D (see FIG. 9) provided in the base 121 near positions corresponding to the three recesses 121B.

[0070] 9 and 11, the circuit board 122 is a flexible printed circuit board that forms wiring that electrically connects the external connection board 121A and the image sensor board 123, and is disposed between the base 121 and the image sensor board 123 in the Z direction. The circuit board 122 has a first connection portion 122A, a second connection portion 122B, and a wiring portion 122C.

[0071] The first connection portion 122A is a portion that is connected to the external connection board 121A, and is disposed at a position corresponding to the end of the base 121 on the negative side in the Y direction where the external connection board 121A is located.

[0072] The second connection portion 122B is a portion that is connected to the image sensor substrate 123, and is arranged at a position on the +X side of the end of the base 121 on the -Y side relative to the first connection portion 122A in the X direction.

[0073] Wiring portion 122C is a portion that constitutes the wiring of circuit board 122, and connects first connecting portion 122A and second connecting portion 122B. Details of circuit board 122 will be described later.

[0074] Image sensor substrate 123 is a substantially rectangular substrate and serves as an imaging element holder for holding an imaging element. Image sensor substrate 123 is arranged so as to be able to swing in the X, Y, or θ direction within the XY plane. The θ direction is the direction around an axis centered on the optical axis. An opening 123A is provided in the center of image sensor substrate 123, and the imaging element is attached so as to cover this opening 123A.

[0075] The imaging element is configured by, for example, a CCD (charge-coupled device) image sensor, a CMOS (complementary metal oxide semiconductor) image sensor, etc. The imaging element captures an image of a subject formed by a lens unit. Image information obtained by the imaging element is processed by an image processing unit (for example, a CPU: Central Processing Unit) built into the smartphone M.

[0076] 11, a yoke 123B for magnetically attracting the above-mentioned magnet 121C is provided on the negative surface in the Z direction of the image sensor substrate 123. The yoke 123B is provided at a position corresponding to the above-mentioned magnet 121C. The magnetic attraction between the yoke 123B and the above-mentioned magnet 121C makes it possible to stabilize the posture of the image sensor substrate 123 even if the image sensor substrate 123 wobbles within the XY plane.

[0077] 12, the OIS coil 124 is disposed at a position facing each of the four drive magnets 114 (OIS magnets 114B) in the Z direction. The OIS coil 124 is an air-core coil that is energized during shake correction, and is disposed on the image sensor substrate 123.

[0078] The OIS coil 124 has a first coil 124A, a second coil 124B, a third coil 124C, a fourth coil 124D, a fifth coil 124E, and a sixth coil 124F.

[0079] The first coil 124A is disposed along a side parallel to the Y direction at the end on the negative side in the X direction of the image sensor substrate 123. The second coil 124B is disposed along a side parallel to the Y direction at the end on the positive side in the X direction of the image sensor substrate 123. In other words, the first coil 124A and the second coil 124B are provided at both ends of the image sensor substrate 123 in the X direction, and are disposed opposite each other in the X direction with the opening 123A between them.

[0080] The third coil 124C and the fourth coil 124D are arranged along a side parallel to the X direction at the end on the positive side in the Y direction of the image sensor substrate 123. The fourth coil 124D is arranged on the positive side in the X direction of the third coil 124C.

[0081] The fifth coil 124E and the sixth coil 124F are arranged along a side parallel to the X direction at the end on the negative side in the Y direction of the image sensor substrate 123. The sixth coil 124F is arranged on the positive side in the X direction of the fifth coil 124E.

[0082] The third coil 124C and the fifth coil 124E are provided at both ends of the image sensor substrate 123 in the Y direction and are arranged opposite each other in the Y direction with the opening 123A in between. The fourth coil 124D and the sixth coil 124F are provided at both ends of the image sensor substrate 123 in the Y direction and are arranged opposite each other in the Y direction with the opening 123A in between.

[0083] Furthermore, magnetic sensors 126 are mounted on the image sensor substrate 123. The magnetic sensors 126 are configured with, for example, a Hall element or a TMR sensor, and are provided one at a position corresponding to each of the first coil 124A, the third coil 124C, and the fifth coil 124E.

[0084] The magnetic sensor 126 can identify the position of the OIS movable part M1 in the XY plane by detecting the magnetic field formed by the OIS magnet 114B facing the corresponding coil.

[0085] When shake correction is performed in camera module A, current is passed through OIS coil 124. Specifically, the current passing through OIS coil 124 is controlled based on a detection signal from a shake detection unit (not shown, for example, a gyro sensor) so as to cancel out shake of camera module A. At this time, by feeding back the detection result of magnetic sensor 126, it is possible to accurately control the swing of OIS movable part M1.

[0086] When the OIS coil 124 is energized, a Lorentz force is generated in the OIS coil 124 (Fleming's left-hand rule) due to the interaction between the magnetic field of the OIS magnet 114B and the current flowing through the OIS coil 124. The direction of the Lorentz force is a direction (Y direction, X direction, or θ direction) perpendicular to the direction of the magnetic field (Z direction) and the direction of the current flowing through the OIS coil 124 (X direction or Y direction).

[0087] For example, when a current in the Y direction flowing through the first coil 124A and the second coil 124B is used, the Lorentz force is in the X direction because the current direction is the Y direction. Also, when a current in the X direction flowing through the third coil 124C and the fifth coil 124E and the fourth coil 124D and the sixth coil 124F is used, the Lorentz force is in the Y direction. Specifically, when current is applied so that the third coil 124C and the fourth coil 124D and the fifth coil 124E and the sixth coil 124F are oriented in the same direction (clockwise or counterclockwise), the image sensor substrate 123 oscillates in the Y direction. Also, when current is applied so that the third coil 124C and the fourth coil 124D are oriented in the same direction, and so that the fifth coil 124E and the sixth coil 124F are oriented in the opposite direction, the image sensor substrate 123 oscillates in the θ direction.

[0088] Because magnet holder 113 is fixed, a reaction force acts on OIS coil 124. This reaction force becomes the driving force for the voice coil motor, which is OIS driver D2. This driving force causes image sensor board 123, which has OIS coil 124, and the imaging element held by image sensor board 123 to swing in the X, Y, or θ direction within the XY plane, thereby performing shake correction.

[0089] Next, the biasing portion of the AF unit 11 will be described in detail.

[0090] 13, the biasing portion is for biasing the lens holder 111 toward the magnet holder 113, and is composed of a position detection magnet 111C, a biasing yoke 111E, and an AF magnet 114A. In the following description, of the four rectangular corners of the lens holder 111 and the magnet holder 113, the corner on the + side in the V direction where the position detection magnet 111C is located will be referred to as a first corner C1, and the corner on the - side in the V direction where the biasing yoke 111E is located will be referred to as a second corner C2. Furthermore, of the four corners, the two corners on the + side and the - side in the U direction that correspond to the hole 111A of the lens holder 111 and the biased portion 116 of the magnet holder 113 will be referred to as a third corner C3 and a fourth corner C4, respectively.

[0091] The position detection magnet 111C not only detects the position of the lens holder 111, but also functions as a biasing magnet that biases the lens holder 111 toward the magnet holder 113. The position detection magnet 111C is disposed opposite two AF magnets 114A (first magnets A1) that are held by two side walls 113A that include a first corner C1 out of four side walls 113A of the magnet holder 113. The two side walls 113A that include the first corner C1 are the side wall 113A on the positive side in the Y direction and the side wall 113A on the negative side in the X direction out of the four side walls 113A.

[0092] Specifically, the position detection magnet 111C is disposed at a position corresponding to the outside of the AF coil 112, and faces the end portions (second portions) of the two first magnets A1. The second portions include, for example, a portion of the first magnet A1 at the first corner C1 that does not face the AF coil 112 and is on the positive side in the V direction of the position detection magnet 111C (such as the portion indicated by the symbol A11).

[0093] The position detection magnet 111C is arranged so that the north pole is on the inside of the lens holder 111 and the south pole is on the outside of the lens holder 111. In this case, the magnetic flux generated from the position detection magnet 111C becomes a first magnetic flux G1 that flows from the north pole side (inside) to the south pole side (outside), as shown in FIG.

[0094] The two first magnets A1 are arranged so that the north pole is located on the side facing the AF coil 112 (the side facing the lens holder 111) and the south pole is located on the opposite side. The magnetic flux at parts other than the end parts of the first magnets A1 becomes magnetic flux directed toward the opposing AF coil 112, but the magnetic flux at the end parts of the first magnets A1 becomes second magnetic flux G2 that wraps around from the north pole side to the south pole side.

[0095] The first magnetic flux G1 and the second magnetic flux G2 repel each other just before (upstream of) the point G3 where they intersect. As a result, the position detection magnet 111C magnetically repels the first magnet A1. Furthermore, the second magnetic flux G2 becomes a magnetic flux that repels the position detection magnet 111C downstream of point G3. Therefore, a virtual magnet with its south pole on the negative V-direction faces the position detection magnet 111C, creating a magnetically repulsive relationship between the two. As a result, the position detection magnet 111C magnetically repels the first magnet A1. The position detection magnet 111C generates equal repulsive forces from the first magnets A1 on both sides in the U-direction, resulting in a repulsive force toward the negative V-direction, which is perpendicular to the U-direction. Therefore, the position detection magnet 111C magnetically biases the lens holder 111 toward the side away from the two first magnets A1 (the negative V-direction).

[0096] In this embodiment, the position detection magnet 111C is arranged so that the north pole is on the inside of the lens holder 111 and the south pole is on the outside of the lens holder 111, but this is not limiting. The position detection magnet 111C may be arranged so that the north and south poles of the position detection magnet 111C face in either direction, as long as it is arranged so that it is magnetically biased away from the two first magnets A1.

[0097] For example, if the position detection magnet 111C faces a portion of the first magnet A1 other than the ends, magnetic flux flows from the portion (north pole) of the first magnet A1 that faces the position detection magnet 111C toward the position detection magnet 111C. In this case, the position detection magnet 111C should be arranged so that the inside of the lens holder 111 is the south pole and the outside of the lens holder 111 is the north pole. This causes repulsion between the magnetic flux from the north pole of the first magnet A1 and the magnetic flux from the north pole of the position detection magnet 111C. As a result, this repulsive force magnetically biases the lens holder 111 in a direction away from the two first magnets A1.

[0098] 13, the biasing yoke 111E is disposed inside the AF coil 112. The biasing yoke 111E faces two AF magnets 114A (second magnets A2) held by two side walls 113A including the second corner C2 out of four side walls 113A of the magnet holder 113. The two side walls 113A including the second corner C2 are the side wall 113A on the negative side in the Y direction and the side wall 113A on the positive side in the X direction out of the four side walls 113A.

[0099] Specifically, the biasing yoke 111E faces magnetically attracted portions (first portions) of the two second magnets A2. The first portions include, for example, portions of the second magnets A2 at the second corner C2 that do not face the AF coil 112 (such as the portion indicated by reference symbol A21). The biasing yoke 111E is attracted by equal attractive forces from the second magnets A2 on both sides in the U direction, resulting in the generation of attractive forces toward the negative side of the V direction perpendicular to the U direction. Therefore, the biasing yoke 111E magnetically biases the lens holder 111 toward the side attracted by the two second magnets A2 (the negative side of the V direction).

[0100] That is, the biasing direction of the position-detecting magnet 111C and the biasing direction of the biasing yoke 111E are the same. That is, the repulsive direction of the position-detecting magnet 111C with respect to the first magnet A1 is parallel to the attractive direction of the biasing yoke 111E to the second magnet A2. In other words, the position-detecting magnet 111C magnetically repels the two first magnets A1 on the side where the biasing yoke 111E is attracted to the two second magnets A2.

[0101] This combines the biasing force of position detection magnet 111C and the biasing force of biasing yoke 111E, thereby increasing the biasing force of lens holder 111 on magnet holder 113. Furthermore, because the repulsive direction of position detection magnet 111C and the attractive direction of biasing yoke 111E are parallel, the biasing force of lens holder 111 on magnet holder 113 can be further increased.

[0102] Furthermore, because position detection magnet 111C is disposed on the opposite side of biasing yoke 111E across the lens holding portion of lens holder 111, the repulsion direction of position detection magnet 111C can be made to be more likely to be the side to which biasing yoke 111E is attracted. As a result, the biasing force of lens holder 111 on magnet holder 113 can be easily increased.

[0103] Lens holder 111 is supported in the V direction by rolling members 117 interposed between biased portion 116 of magnet holder 113 and hole 111A at portions corresponding to third corner C3 and fourth corner C4. In other words, rolling members 117 support lens holder 111 biased by the biasing portion so that it can move in the optical axis direction. Therefore, lens holder 111 biased by the biasing portion can be easily moved in the optical axis direction while being supported by rolling members 117.

[0104] Additionally, the first groove 111B of the hole 111A of the lens holder 111, the rolling member 117, and the second groove 116C of the protrusion 116B of the magnet holder 113 are aligned in the V direction. In other words, the first groove 111B, the rolling member 117, and the second groove 116C are aligned in the repulsive direction of the position detection magnet 111C with respect to the first magnet A1.

[0105] Here, "arranged side by side in the repulsion direction" includes not only cases where the arrangement direction and the force direction are completely aligned, but also cases where there is a slight angle or misalignment between the arrangement direction and the force direction due to manufacturing errors, etc.

[0106] This allows the biasing force of the biasing portion to be transmitted straight to the biased portion 116 without being dispersed in a direction deviated from the V direction. As a result, the biasing force of the lens holder 111 applied to the magnet holder 113 can be further increased.

[0107] In addition, the force receiving portion 116 has an extension portion 116A and a protruding portion 116B that protrudes into a hole 111A of the lens holder 111, in which a first groove 111B along which the rolling member 117 can slide is formed, and in which a second groove 116C along which the rolling member 117 can slide is formed.

[0108] This allows a simple structure to be realized for supporting the lens holder 111 in the magnet holder 113. Furthermore, this support structure allows the lens holder 111 to be easily assembled in the magnet holder 113.

[0109] Furthermore, in the case of a moving coil type configuration, it is difficult to provide rolling members 117 on the side surfaces of lens holder 111, but in this embodiment, rolling members 117 can be arranged in a small space using holes 111A and protrusions 116B. That is, in the moving coil type configuration, the configuration of AF movable part M2 can be simplified and the weight can be reduced.

[0110] Furthermore, since the position detection magnet 111C functions as an energizing magnet, there is no need to provide two magnets, one for position detection and one for energizing. As a result, the number of parts can be reduced. Furthermore, by reducing the number of parts, the configuration of the drive device 1 can be made more compact.

[0111] Next, details of wiring portion 122C of circuit board 122 will be described.

[0112] As shown in FIG. 15, the wiring section 122C has a signal wiring board 122D and a power wiring board 122E that are separated from each other.

[0113] The signal wiring board 122D is a wiring board for supplying a signal based on a control signal of the camera module A to the image sensor board 123. The signal wiring board 122D is configured to have a plurality of bent portions so as to extend from the first connection portion 122A along the periphery of a predetermined space, and is connected to the second connection portion 122B.

[0114] Power supply wiring board 122E is a wiring board for supplying a signal based on the power supply of camera module A to image sensor board 123. Power supply wiring board 122E is arranged so as to fill the space inside signal wiring board 122D while forming multiple folded portions (part of multiple bent portions) from first connection portion 122A, and is then connected to second connection portion 122B.

[0115] The overall length of the power supply wiring board 122E is longer than the overall length of the signal wiring board 122D. Also, as shown in Fig. 16, the thickness of the signal wiring board 122D is smaller than the thickness of the power supply wiring board 122E.

[0116] In the so-called sensor shift type driving device 1, the image sensor board 123 oscillates in the XY plane, and therefore the circuit board 122 between the base 121 and the image sensor board 123 is located within the oscillation range of the image sensor board 123. If the rigidity of the circuit board 122 is high, it is likely to hinder the operation of the image sensor board 123, so it is desirable to reduce the rigidity of the circuit board 122 so that it can more easily follow the operation of the image sensor board 123.

[0117] However, in the case of a flat substrate, reducing the rigidity of the substrate can be achieved by reducing its thickness or narrowing the width of the substrate itself. However, since a large amount of current is required for the power supply wiring, the substrate needs to have a certain thickness. Therefore, it is difficult to reduce the rigidity of a flat substrate.

[0118] In this embodiment, since the signal wiring board 122D and the power wiring board 122E of the wiring portion 122C are separate from each other, the rigidity of the circuit board 122 can be reduced compared to a flat board.

[0119] Furthermore, since only power supply wiring is arranged on the power supply wiring board 122E, the width of the power supply wiring board 122E can be narrower than in a configuration in which wiring other than power supply wiring, such as signal wiring, is arranged on the same board, thereby reducing the overall rigidity of the circuit board 122.

[0120] Furthermore, since the thickness of the signal wiring board 122D is smaller than the thickness of the power wiring board 122E, the rigidity of the signal wiring board 122D, which does not need to be thick, can be reduced, thereby reducing the rigidity of the wiring portion 122C as a whole.

[0121] Furthermore, since signal wiring board 122D and power wiring board 122E are configured with bent portions, wiring section 122C can be accommodated in a limited space. In particular, since the overall length of power wiring board 122E is longer than the overall length of signal wiring board 122D, providing bent portions makes it easier to accommodate wiring section 122C in a limited space.

[0122] 17, for example, a slit 122F may be formed in the power supply wiring board 122E. The power supply wiring board 122E may include, for example, two or more wires, and the slit 122F is formed between the two wires. The slit 122F may be formed over the entire power supply wiring board 122E, or may be formed in a portion of the power supply wiring board 122E.

[0123] This reduces the rigidity of power supply wiring board 122E. Furthermore, power supply wiring board 122E needs to have a certain thickness because it needs to carry a large amount of current, but slits 122F can reduce the rigidity of power supply wiring board 122E while ensuring the thickness of power supply wiring board 122E.

[0124] In the above embodiment, the repulsive direction of the position detecting magnet 111C is parallel to the attractive direction of the biasing yoke 111E, but the present invention is not limited to this. As long as the repulsive direction of the position detecting magnet 111C includes the same directional component as the attractive direction of the biasing yoke 111E, it does not have to be parallel to the attractive direction.

[0125] Furthermore, in the above embodiment, position detection magnet 111C is arranged on the opposite side of biasing yoke 111E across the lens holding portion of lens holder 111, but the present invention is not limited to this. For example, the biasing magnet and biasing yoke may be arranged on the same side of the rectangle of lens holder 111. In this case, it is sufficient that the biasing magnet is magnetized so that its repulsive direction has a directional component that is the same as the attractive direction of the biasing yoke.

[0126] In the above embodiment, among the four drive magnets 114, the position detection magnet 111C and the biasing yoke 111E face different magnets, but the present invention is not limited to this. For example, as long as the biasing magnet is magnetized in a repulsive direction that has the same directional component as the attraction direction of the biasing yoke, the biasing magnet and the biasing yoke may face one drive magnet.

[0127] In the above embodiment, the lens holder 111 is supported by the rolling members 117 so as to be movable in the optical axis direction, but the present invention is not limited to this, and the lens holder may be supported by other support members such as an elastic support member, for example. In this case, the drive unit 1 does not need to have a support structure such as the hole 111A and the biased portion 116.

[0128] Furthermore, in the above embodiment, the position detection magnet 111C also serves as an urging magnet, but the present invention is not limited to this, and an urging magnet may be provided separately from the position detection magnet.

[0129] Furthermore, in the above embodiment, the signal wiring board 122D and the power wiring board 122E are configured to have bent portions, but the present invention is not limited to this, and they do not have to be configured to have bent portions.

[0130] In the above embodiment, the overall length of the power supply wiring board 122E is longer than the overall length of the signal wiring board 122D, but the present invention is not limited to this. For example, if necessary, the overall length of the power supply wiring board 122E may be the same as the overall length of the signal wiring board 122D.

[0131] In the above embodiment, the signal wiring board 122D is configured to have a thickness smaller than that of the power supply wiring board 122E, but the present invention is not limited to this. For example, the signal wiring board 122D may have a thickness equal to that of the power supply wiring board 122E.

[0132] Furthermore, in the above embodiment, the signal wiring board 122D and the power supply wiring board 122E are separate from each other, but the present invention is not limited to this, and the signal wiring board and the power supply wiring board may be integrated.

[0133] Furthermore, in the above embodiment, the driving device is of a sensor shift type, but the present invention is not limited to this, and may be of a barrel shift type, for example.

[0134] Furthermore, for example, in the above embodiment, a smartphone, which is a camera-equipped mobile terminal, has been described as an example of a camera-equipped device equipped with a camera module A. However, the present invention can be applied to a camera-equipped device having a camera module and an image processing unit that processes image information obtained by the camera module. Camera-equipped devices include information devices and transportation equipment. Information devices include, for example, camera-equipped mobile phones, laptop computers, tablet terminals, portable game consoles, web cameras, drones, and camera-equipped in-vehicle devices (e.g., backup monitor devices, drive recorder devices). Transportation equipment includes, for example, automobiles and drones.

[0135] 18A and 18B are diagrams showing an automobile V as a camera-mounted device equipped with an in-vehicle camera module VC (Vehicle Camera). FIG. 18A is a front view of the automobile V, and FIG. 18B is a rear perspective view of the automobile V. The automobile V is equipped with the camera module described in the embodiment as the in-vehicle camera module VC. As shown in FIGS. 18A and 18B, the in-vehicle camera module VC is attached, for example, to the windshield facing forward or to the rear gate facing backward. This in-vehicle camera module VC is used for backup monitoring, drive recorders, collision avoidance control, autonomous driving control, etc.

[0136] Furthermore, the above-described embodiments are merely examples of specific embodiments of the present invention, and the technical scope of the present invention should not be interpreted as being limited by these embodiments. In other words, the present invention can be embodied in various forms without departing from the gist or main features of the present invention. For example, the shapes, sizes, numbers, and materials of the components described in the above-described embodiments are merely examples, and can be modified as appropriate. [Industrial Applicability]

[0137] INDUSTRIAL APPLICABILITY The driving device according to the present invention is useful as a driving device, a camera module, and a camera-mounted device that can further improve the biasing force applied to the housing portion in the lens holder. [Explanation of symbols]

[0138] 1. Drive unit 2 Shield cover 11 AF unit 12 OIS unit 111 Lens holder 111A hole 111B 1st groove 111C Position detection magnet 111D Magnet fixing part 111E energizing yoke 111F yoke fixing part 112 AF coil 113 Magnetic Holder 113A Side wall 113B Aperture 113C Magnet holder 113D Fixed part 114 Drive magnet 114A AF Magnet 114B OIS Magnet 115 Power supply member 115A 1st fixed part 115B 2nd fixed part 115C Arm 116 Forced part 116A Extension 116B Protrusion 116C 2nd groove 117 Rolling members 118 PCB 121 Base 121A External connection board 121B Recess 121C Magnet 121D Placement section 122 Circuit Board 122A 1st connection 122B Second connection part 122C wiring section 122D signal wiring board 122E Power supply wiring board 123 Image sensor board 123A aperture 123B York 124 OIS coil 124A 1st coil 124B Second coil 124C 3rd coil 124D 4th coil 124E 5th coil 124F 6th coil 125 Rolling members 126 Magnetic Sensor M Smartphone A Camera module

Claims

1. a lens holder for holding a lens; a housing portion that houses the lens holder; a drive unit including a coil unit provided on one of the lens holder and the housing unit, and a drive magnet unit provided on the other of the lens holder and the housing unit, and configured to drive the lens holder in the optical axis direction relative to the housing unit; a biasing portion that biases the lens holder to the accommodation portion; Equipped with The biasing portion is a biasing yoke disposed opposite to the first portion of the drive magnet portion and magnetically attracted to the first portion; an urging magnet that faces the second portion of the drive magnet unit and is disposed on the side of the urging yoke that is attracted to the first portion so as to magnetically repel the second portion; having Drive unit.

2. the coil portion is disposed on the lens holder, the drive magnet portion is disposed in the housing portion, The biasing portion is disposed on the lens holder. The drive device according to claim 1 .

3. the biasing magnet is disposed on the opposite side of the biasing yoke across the lens holding portion of the lens holder; The drive device according to claim 2 .

4. a repulsive direction of the biasing magnet with respect to the second portion is parallel to a direction of attraction of the biasing yoke to the first portion; The drive device according to claim 3 .

5. a support portion that supports the lens holder biased by the biasing portion so as to be movable along the optical axis direction, The drive device according to claim 1 .

6. the support portion is a rolling member, the lens holder has an opening in which a first groove is formed, in which the rolling member can slide; the accommodation portion has an extension portion that extends from a portion facing a side surface of the lens holder to a position facing the opening, and a protrusion portion that protrudes from the extension portion into the opening and has a second groove formed therein in which the rolling member can slide. The drive device according to claim 5.

7. the first groove, the rolling member, and the second groove are arranged side by side in a repulsive direction with respect to the second portion of the biasing magnet; The drive device according to claim 6.

8. the biasing magnet is a position detection magnet for detecting the position of the lens holder in the optical axis direction; The drive device according to claim 1 .

9. The drive device according to claim 1 ; an element portion including the lens; an imaging unit including an imaging element that captures a subject image formed by the element unit; Equipped with Camera module.

10. A camera-equipped device that is an information device or a transportation device, The camera module according to claim 9; an imaging control unit that processes image information obtained by the camera module; Equipped with Camera-equipped device.

Images