Optical element driving device, camera module, and camera mounting device

Abstract

Provided is an optical element driving device, a camera module, and a camera mounting device that can stabilize electrical connectivity. The optical element driving device includes: a movable portion that can hold an optical element; a cylindrical accommodation portion that surrounds the outer periphery of the movable portion, accommodates the movable portion, and has a rectangular shape in plan view; a fixed portion that is disposed on one side in the optical axis direction with respect to the movable portion and the accommodation portion; a leaf spring member that supports the movable portion in such a manner that the movable portion can move in the optical axis direction with respect to the accommodation portion; and a wire member that supports the accommodation portion in such a manner that the accommodation portion can move in a direction orthogonal to the optical axis with respect to the fixed portion. The wire member is configured such that, at each of the four corners of the accommodation portion, a wire group composed of two or more wire members is connected to a common leaf spring member.

Description

Technical Field

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

[0002] Generally, portable devices such as smartphones incorporate small camera modules. These camera modules utilize optical element driving devices that drive the optical elements.

[0003] The optical element drive unit has an autofocus function (hereinafter referred to as "AF function") and an image stabilization function (hereinafter referred to as "OIS function"). The optical element drive unit automatically focuses on the subject when shooting through the AF function, and reduces image blur by optically correcting the shaking (vibration) that occurs during shooting through the OIS function.

[0004] For example, Patent Document 1 shows an optical element driving device with both AF and OIS functions. The optical element driving device shown in Patent Document 1 includes: a movable part capable of holding an optical element and having a coil; a quadrangular cylindrical receiving part having a magnet and accommodating the movable part in a manner that allows the movable part to move in the direction of the optical axis; and a fixing part supporting the movable part and the receiving part in a manner that allows the movable part and the receiving part to move in a direction intersecting the optical axis (orthogonal direction of the optical axis).

[0005] Furthermore, for example, the optical element driving device described in Patent Document 1 includes: a leaf spring member mounted on a receiving portion and supporting the movable portion from above to an opening side; and two wire members extending between a fixed portion and a leaf spring member, corresponding to each of the four corners of the receiving portion, and supporting the receiving portion. Moreover, at each of the four corners of the receiving portion, each of the two wire members is connected to a different leaf spring member.

[0006] The problem the invention aims to solve

[0007] However, in the optical element driving device described in Patent Document 1, at each of the four corners of the housing, two wire components are each connected to a different leaf spring component. Therefore, the wire components at the corners become different electrical paths. Since the wire components are displaced at the corners, there is a possibility that the wire components may come into contact with each other, posing a risk of short circuit.

[0008] Existing technical documents

[0009] Patent documents

[0010] Patent Document 1: Japanese Patent Application Publication No. 2016-180836 Summary of the Invention

[0011] The purpose of this invention is to provide an optical element driving device, a camera module, and a camera mounting device that enable stable electrical connectivity.

[0012] Solution to the problem

[0013] As one embodiment of the optical element driving device of the present invention, the optical element driving device includes: a movable part capable of holding an optical element; a cylindrical receiving part, which is rectangular in shape when viewed from above, and surrounds the outer periphery of the movable part and receives the movable part; a fixed part disposed on one side in the optical axis direction relative to the movable part and the receiving part; a leaf spring member supporting the movable part in such a way that the movable part can move relative to the receiving part in the optical axis direction; and a wire member supporting the receiving part in such a way that the receiving part can move relative to the fixed part in a direction orthogonal to the optical axis, wherein the wire member is configured such that at each of the four corners of the receiving part, a group of wires consisting of two or more wire members is connected to a common leaf spring member.

[0014] As one embodiment of the camera module of the present invention, the camera module includes: the optical element driving device described above; the optical element; and an imaging unit for capturing an image of a subject imaged by the optical element.

[0015] As one embodiment of the camera mounting device of the present invention, the camera mounting device is an information device or a transport device, and includes: the camera module described above; and an image processing unit for processing image information obtained by the camera module.

[0016] Invention Effects

[0017] According to the present invention, electrical connectivity can be stabilized. Attached Figure Description

[0018] Figure 1A This is a front view of an example of a camera mounting device equipped with a camera module according to an embodiment of the present invention. Figure 1B This is a rear view of an example of the camera mounting device according to an embodiment of the present invention.

[0019] Figure 2A This is a front view of another example of a camera mounting device equipped with a camera module according to an embodiment of the present invention. Figure 2B This is a perspective view of another example of the camera mounting device according to an embodiment of the present invention.

[0020] Figure 3This is a perspective view schematically illustrating the structure of a camera module according to an embodiment of the present invention.

[0021] Figure 4 This is a perspective view of the optical element driving device of the camera module according to an embodiment of the present invention.

[0022] Figure 5 This is an exploded perspective view, viewed from above, showing the camera module in an embodiment of the present invention with the cover removed from the optical element driving device.

[0023] Figure 6 The embodiments of the present invention are viewed from below. Figure 5 The decomposed 3D diagram of the state shown.

[0024] Figure 7 This indicates that in the embodiments of the present invention Figure 5 An exploded perspective view of the internal structure of the optical element drive device with the cover removed.

[0025] Figure 8 This is a top view showing an embodiment of the leaf spring component of the present invention, viewed from above.

[0026] Figure 9 This refers to the leaf spring component of an embodiment of the present invention. Figure 8 The enlarged top view is shown in section A.

[0027] Figure 10 This refers to the leaf spring component of Modified Example 1 of the present invention. Figure 8 The enlarged top view is shown in section A.

[0028] Figure 11 This refers to the leaf spring component of Modified Example 2 of the present invention. Figure 8 The enlarged top view is shown in section A.

[0029] Explanation of reference numerals in the attached figures

[0030] 1 Optical element driving device

[0031] 2. Lens section (optical elements)

[0032] 3 masks

[0033] 5. Camera Department

[0034] 10 OIS Correction Department

[0035] 11 AF focusing section

[0036] 12 AF holding section

[0037] 12a Magnet Holder (Receiving Section)

[0038] 13AF leaf spring support

[0039] 13a Upper leaf spring assembly (leaf spring assembly)

[0040] 13a1 Lens Support Side Connection

[0041] 13a11 First Connecting Part

[0042] 13a12 First Arm

[0043] 13a13 Second Arm

[0044] 13a2 Magnet Support Side Connection (Receiving Part Side Connection)

[0045] 13a21 Second Connecting Part

[0046] 13a22 extension

[0047] 13a23 joint

[0048] 13a24 Reinforcement Section

[0049] 13a3 Suspension wire side connection (wire component side connection)

[0050] 13a31 Bridging section

[0051] 13a32 Third Connecting Part

[0052] 13b Lower leaf spring assembly

[0053] 20 OIS base

[0054] 22 OIS coil section

[0055] 23 Magnetic Sensor Section

[0056] 24 Protective components

[0057] 25. Base component (fixed part)

[0058] 27 Wiring components

[0059] 27a1 coil terminal elements

[0060] 30 Suspension wire (wire component)

[0061] 110 Lens Support (Moving Part)

[0062] 110a Lens Holding Section

[0063] 110a1 lens accommodating opening

[0064] 111 AF coil section

[0065] 125 Magnet Section

[0066] 250 Central opening

[0067] 252 Coil Recess

[0068] 301 Opening

[0069] 501 Image Sensor Substrate

[0070] 502 camera element

[0071] 503 Control Department. Detailed Implementation

[0072] The embodiments of the present invention will now be described in detail with reference to the accompanying drawings.

[0073] [Regarding the structure of the camera mounting device]

[0074] First, a camera mounting device for a camera module to which embodiments of the present invention are applied will be described.

[0075] Figure 1A , Figure 1B This diagram shows a smartphone M (an example of a camera-mounted device) equipped with a camera module A. Figure 1A This is the main view of the smartphone M. Figure 1B This is a rear view of smartphone M. Smartphone M has more than one rear camera OC. Camera module A is used in the rear camera OC.

[0076] The smartphone M is a camera-equipped device that functions as an information device. The smartphone M includes: a camera module A, and an image processing unit that processes the image information obtained by the camera module A. The camera module A has AF and OIS functions, enabling it to automatically focus on the subject when shooting, and to optically correct for camera shake (vibration) during shooting to capture a clear image.

[0077] Figure 2A , Figure 2B This is a diagram showing a car V (another example of a camera mounting device) equipped with a vehicle camera module VC (vehicle camera). Figure 2A This is the front view of car V. Figure 2B This is a 3D view of the rear of a car (V). For example... Figure 2A and Figure 2BAs shown, the vehicle-mounted camera module VC is mounted, for example, facing forward on the windshield or facing backward on the tailgate. The vehicle-mounted camera module VC is used for purposes such as rear-view monitoring, dashcams, collision avoidance control, and autonomous driving control. In the vehicle-mounted camera module VC of automobile V, camera module A is used.

[0078] The vehicle-mounted camera module VC is a camera mounting device used in transportation equipment. The vehicle-mounted camera module VC includes: a camera module A, and an image processing unit that processes the image information obtained from the camera module A. The vehicle-mounted camera module VC has AF and OIS functions, enabling automatic focusing when photographing the subject and optical correction for camera shake (vibration) to capture clear images.

[0079] Furthermore, optical element driving devices can be applied to various camera-mounted devices. For example, camera-mounted devices include various information devices and transportation equipment. Information devices include, for example, mobile phones, laptops, tablets, portable game consoles, and webcams with built-in cameras. Transportation equipment includes, for example, vehicle-mounted devices with built-in cameras (e.g., rear-view cameras, dashcams), drones, etc.

[0080] [Regarding the structure of camera module A]

[0081] Next, the general structure of camera module A will be described. An orthogonal coordinate system (X, Y, Z) will be used. It should be noted that the representation of shape is a convenient expression for a brief overview and, needless to say, does not necessarily conform to a geometrically accurate graphical definition.

[0082] Figure 3 This is a schematic 3D diagram illustrating the structure of camera module A. For example, when a smartphone M is taking a picture, camera module A is mounted with the X direction as the up-down (or left-right) direction, the Y direction as the left-right (or up-down) direction, and the Z direction as the front-back direction. That is, the Z direction is the optical path direction. Figure 3 In the diagram, the upper side (+Z side) is the light-receiving side in the optical path direction (also called the "macro position side"), and the lower side (-Z side) is the imaging side in the optical path direction (also called the "infinity position side"). Directions orthogonal to the Z direction are optical path orthogonal directions. The X and Y directions are examples of optical path orthogonal directions.

[0083] Figure 4 This is a perspective view of the optical element drive unit 1 of camera module A. (See image below.) Figure 4As shown, the path through which the common light passes, i.e., the optical path, is formed by the opening 301 of the cover 3, the lens receiving opening 110a1 in the AF focusing section 11 that accommodates the lens section 2, and the central opening 250 in the OIS base 20 for the imaging element 502. Furthermore, the extending direction of this optical path (the direction through which each opening passes) is the optical path direction. Regarding the optical path direction, it can also be referred to by other names such as "optical axis direction" or "focal point direction" (the direction in which the focus is adjusted), depending on the type of optical element. Additionally, regarding the orthogonal direction of the optical path, it can also be called "orthogonal optical axis direction" or "shake correction direction," etc., and regarding the XY plane, it can also be called "orthogonal optical axis plane" or "shake correction plane," etc.

[0084] In addition, unless otherwise specified, in the following description, "radial" refers to the direction extending radially or centrifugally with the optical path or optical axis as the center, and "circumferential" refers to the direction extending around the optical path or optical axis. Furthermore, unless otherwise specified, "outer side" refers to the outer side of the radial direction with the optical path or optical axis as the center, and "inner side" refers to the inner side of the radial direction with the optical path or optical axis as the center.

[0085] Furthermore, in the following description, the four corners of the top-view shape (here, a square) of camera module A will sometimes be distinguished and defined. In this case, for ease of understanding, the corner on the X-direction + side and the Y-direction + side will be called the "first corner", the corner on the X-direction - side and the Y-direction + side will be called the "second corner", the corner on the X-direction - side and the Y-direction - side will be called the "third corner", and the corner on the X-direction + side and the Y-direction - side will be called the "fourth corner".

[0086] like Figure 3 As shown, the camera module A includes: an optical element driving device 1 that realizes AF and OIS functions; a lens section 2 (an example of an optical element) formed by housing a lens in a cylindrical lens tube; and an imaging section 5 that captures an image of a subject imaged through the lens section 2.

[0087] The outer side of the optical element driving device 1 is covered by a cover 3. The cover 3 is a covered tetrahedral body with a rectangular planar shape when viewed along the Z direction. Here, the planar shape of the cover 3 is square. The cover 3 has a generally circular opening 301 on its upper surface (the surface along the Z direction + side). The lens part 2 faces outward from the opening 301 of the cover 3. The cover 3 is fixed to the base part 25 of the OIS base 20 of the optical element driving device 1, for example, by adhesive bonding (see reference). Figure 4 The cover 3, for example, is made of a magnetic material and functions as a shielding component to block electromagnetic waves from the outside of the optical element drive device 1, or to prevent magnetic interaction between the inside and outside of the optical element drive device 1.

[0088] The imaging unit 5 is disposed on the imaging side (Z-direction - side) of the optical element driving device 1. The imaging unit 5 includes, for example, an image sensor substrate 501, an imaging element 502 mounted on the image sensor substrate 501, and a control unit 503. The imaging element 502 is configured, for example, a CCD (charge-coupled device) type image sensor or a CMOS (complementary metal oxide semiconductor) type image sensor, and captures an image of the subject imaged by the lens unit 2. The optical element driving device 1 is mounted on the image sensor substrate 501 and electrically connected to the image sensor substrate 501.

[0089] The control unit 503 is, for example, composed of a control IC (Integrated Circuit) and performs drive control of the optical element driving device 1. The control unit 503 can be provided on the image sensor substrate 501 or on a camera-mounted device (here, a smartphone M) that carries the camera module A.

[0090] It should be noted that the following structure is adopted here: relative to the image sensor substrate 501, which is fixed in position, the lens portion 2 of the OIS correction unit 10 is movable in the optical axis direction and the orthogonal direction of the optical axis in the optical element driving device 1. However, it is also possible to fix the lens portion 2 (cannot move) in at least one of the optical axis direction and the orthogonal direction of the optical axis for the purpose of focusing or shaking correction, while making the imaging element 502 movable (able to move). In this case, the imaging element 502 is an example of an optical element held in the AF focusing unit 11 or the OIS correction unit 10.

[0091] [Structure of optical element driving device 1]

[0092] Next, use Figures 5-10 The structure of the optical element driving device 1 will be described. It should be noted that, for ease of understanding, in the description of the structure of the optical element driving device 1, the Z-direction + side is designated as "up" and the Z-direction - side is designated as "down".

[0093] Figure 5 This is an exploded perspective view, taken from above, showing the state in which the cover 3 has been removed from the optical element drive unit 1 in camera module A. Figure 6 Viewed from below Figure 5 The decomposed 3D diagram of the state shown. Figure 7 It means in Figure 5 An exploded perspective view of the internal structure of the optical element drive device 1 with the cover 3 removed.

[0094] The optical element driving device 1 includes an OIS correction section 10, an OIS base 20, and a suspension wire 30 as a wire component.

[0095] [Regarding OIS Correction Section 10]

[0096] The OIS correction unit 10 has an OIS magnet section, which is the part that swings within the plane orthogonal to the optical axis during jitter correction. This OIS magnet section constitutes an OIS voice coil motor, which is an example of an OIS drive unit. The OIS base 20 is the part that has an OIS coil section. That is, the OIS drive unit of the optical element drive device 1 adopts a moving magnet type. The OIS correction unit 10 is also an "AF unit" that includes an AF drive unit.

[0097] OIS correction units 10 are disposed on OIS base 20 at intervals from OIS base 20 toward the Z-direction + side (light-receiving side or upper side in the optical axis direction), and OIS correction units 10 are connected to OIS base 20 by suspension wires 30.

[0098] The OIS correction unit 10 includes an AF focusing unit 11, an AF holding unit 12, and an AF leaf spring support unit 13 (upper leaf spring component 13a and lower leaf spring component 13b).

[0099] [Regarding the AF focusing section 11]

[0100] The AF focusing part 11 is arranged radially inside the AF holding part 12 at a distance from it, and is connected to the AF holding part 12 via the upper leaf spring member 13a and the lower leaf spring member 13b.

[0101] The AF focusing unit 11 has a coil section that moves relative to the AF holding unit 12 in the Z direction (optical axis direction) during focusing. This coil section constitutes an AF voice coil motor, which is an example of an AF drive unit. The AF holding unit 12 has a magnet section that constitutes an AF voice coil motor. That is, the AF drive unit of the optical element drive device 1 adopts a moving coil type.

[0102] The AF focusing unit 11 has a lens support 110 as a movable part and an AF coil part 111.

[0103] The lens holder 110 is capable of holding the lens portion 2, which serves as an optical element. The lens holder 110 has a cylindrical lens holding portion 110a. The lens portion 2 is fixed to the inner peripheral surface of the opening (lens receiving opening) 110a1 of the lens holding portion 110a, for example, by adhesive bonding. It should be noted that the method of fixing the lens portion 2 to the lens holder 110 is not limited to adhesive bonding, and other methods may also be used.

[0104] The lens holder 110 is formed from a molding material, such as polyarylate (PAR) or a PAR alloy (e.g., PAR / PC) composed of a mixture of various resin materials including PAR. This improves welding strength compared to conventional molding materials, such as liquid crystal polymers (LCP), ensuring toughness and impact resistance even when the lens holder 110 is thin-walled. Consequently, the overall size of the optical element drive device 1 can be reduced, achieving miniaturization and weight reduction.

[0105] The lens holder 110 has an upper flange and a lower flange (not shown) that protrude radially outward from the upper and lower parts of the outer peripheral surface of the lens holding part 110a, respectively. A continuous groove runs along the entire circumference between the upper and lower flanges on the outer peripheral surface. That is, the lens holder 110 has a bobbin structure. An AF coil part 111 is disposed in the groove on the outer peripheral surface of the lens holder 110.

[0106] The AF coil section 111 is a coil that is energized during focusing. The two ends of the AF coil section 111 are tied to a binding part (not shown) provided on the lens holder 110.

[0107] [Regarding AF holding section 12]

[0108] The AF holding part 12 supports the AF focusing part 11 via the AF leaf spring support part 13, so that the AF focusing part 11 can move in the optical axis direction. The AF holding part 12 has a magnet bracket 12a as a receiving part and a magnet part 125.

[0109] The magnet holder 12a is a square-shaped quadrangular cylinder when viewed from above in the Z direction. The magnet holder 12a surrounds the outer periphery of the lens holder 110 and accommodates the lens holder 110. The magnet holder 12a has magnet mounting portions 125 on its inner circumferential surface corresponding to the four corners. A cavity defined by the magnet holder 12a and the magnet portions 125 mounted in the magnet mounting portions forms a lens holder receiving opening, which accommodates the AF focusing section 11.

[0110] A groove is formed that is recessed radially inward, corresponding to each of the four corners of the outer peripheral surface of the magnet support 12a. A suspension wire 30 is disposed in each groove. A damping material (e.g., silicone) can be disposed in the groove. By disposing of the damping material, the generation of unwanted resonance (higher-order resonance modes) can be suppressed, thereby stabilizing the operation of the OIS.

[0111] In the magnet bracket 12a, a lower leaf spring component 13b is fixed on the end face (back side) in the Z direction - side, and an upper leaf spring component 13a is fixed on the face (front side) in the Z direction + side.

[0112] Here, similar to the lens holder 110, the magnet holder 12a is formed from a molding material including polyarylate (PAR) or a PAR alloy (e.g., PAR / PC) composed of a mixture of various resin materials including PAR. This improves welding strength, ensuring toughness and impact resistance even when the magnet holder 12a is thin-walled. Therefore, the overall size of the optical element drive device 1 can be reduced, achieving miniaturization and a lower height.

[0113] The magnet part 125 has four rectangular columnar permanent magnets (an example of a magnet). The magnet part 125 is fixed to the magnet mounting part, for example, by adhesive bonding. Here, the magnet part 125 has a generally isosceles trapezoidal shape when viewed from above.

[0114] Therefore, the space at each of the four corners of the magnet support 12a (specifically, the magnet placement area) can be effectively utilized. The magnet section 125 is magnetized in such a way that a magnetic field is formed that traverses the AF coil section 111 radially and the OIS coil section 22 along the optical axis. Here, for the magnet section 125, the inner peripheral side is magnetized as the N pole and the outer peripheral side is magnetized as the S pole.

[0115] The Z-direction-side end face (back face) of the magnet portion 125 protrudes further in the Z-direction-side than the magnet support 12a. That is, the height of the OIS correction portion 10 is defined by the magnet portion 125. As a result, the height of the OIS correction portion 10 can be minimized according to the size of the magnet portion 125 used to ensure magnetic force, and the height of the optical element drive device 1 can be reduced.

[0116] The magnet part 125 and the AF coil part 111 described above constitute an AF voice coil motor (AF drive part). In addition, the magnet part 125 also serves as an AF magnet part and an OIS magnet part.

[0117] [Regarding AF leaf spring support part 13]

[0118] The AF leaf spring support 13 elastically supports the AF focusing section 11 relative to the AF holding section 12. The AF leaf spring support 13 has an upper leaf spring member 13a and a lower leaf spring member 13b. Here, the leaf springs constituting the upper leaf spring member 13a and the lower leaf spring member 13b are made of, for example, beryllium copper, nickel copper, or stainless steel.

[0119] The upper leaf spring member 13a is mounted on the magnet bracket 12a and supports the lens bracket 110 from the upper opening side. The upper leaf spring member 13a is fixed to the Z-direction + side surface (front) of the magnet bracket 12a on the outer side and to the Z-direction + side surface (front) of the lens bracket 110 on the inner side. In the upper leaf spring member 13a, the arm shape extending from the middle portion between the outer and inner sides can elastically deform, thereby allowing the inner portion of the upper leaf spring member 13a to be relatively displaced in the Z-direction relative to the outer portion of the upper leaf spring member 13a.

[0120] The upper leaf spring component 13a is divided into a power supply path portion and a signal path portion. The power supply path portion is connected to a suspension wire 30 used as a power supply path to the AF control unit (not shown), and the signal path portion is connected to a suspension wire 30 used as a signal path to transmit control signals to the AF control unit (not shown). The upper leaf spring component 13a constituting the power supply path portion is connected to the AF coil portion 111 by solder at the binding portion provided on the magnet bracket 12a.

[0121] The lower leaf spring member 13b is fixed to the Z-direction side (back surface) of the magnet bracket 12a on its outer side and to the Z-direction side (back surface) of the lens bracket 110 on its inner side. In the lower leaf spring member 13b, the arm shape extending from the middle portion between the outer and inner sides can elastically deform, thereby allowing the inner portion of the lower leaf spring member 13b to be relatively displaced in the Z-direction relative to the outer portion of the lower leaf spring member 13b.

[0122] [Regarding OIS base 20]

[0123] The OIS base 20 supports the OIS correction unit 10 by means of a suspension wire 30, which allows the OIS correction unit 10 to swing in the orthogonal direction of the optical axis. The OIS base 20 has an OIS coil unit 22, a magnetic sensor unit 23, a protective member 24, a base member 25 as a fixing member, and a wiring member 27.

[0124] [Regarding OIS coil section 22]

[0125] The OIS base 20 has an OIS coil section 22 at each of its four corners opposite the magnet section 125 in the Z direction (optical axis direction). The OIS coil section 22 is a coil that is energized during jitter correction. Four OIS coil sections 22 are provided corresponding to the magnet section 125. The four OIS coil sections 22 are air-core coils.

[0126] The size and arrangement of the OIS coil section 22 and the magnet section 125 are set such that the magnetic field radiated from the bottom surface of the magnet section 125 traverses the long side portion of each of the OIS coil sections 22 in the Z direction. The combination of the magnet section 125 and the OIS coil section 22 constitutes an OIS voice coil motor (OIS drive section).

[0127] The ends of the wires provided at both ends of each OIS coil section 22 are connected by solder to the coil terminal element 27a1 (an example of a coil terminal) of the wiring component 27 provided on the base component 25. That is, each OIS coil section 22 is directly connected to the coil terminal element 27a1 without passing through the substrate. The base component 25 is provided with coil recesses (an example of a second recess) 252 for arranging each OIS coil section 22, and each OIS coil section 22 is arranged in the coil recesses 252 at the four corners. Details regarding the arrangement of each OIS coil section 22 on the base component 25 will be described later.

[0128] [Regarding the magnetic sensor section 23]

[0129] Within the cavities at the center of the corresponding OIS coil portions 22 at the first and fourth corners of the OIS base 20, there are magnetic sensor portions 23. The magnetic sensor portion 23 detects the position of the OIS correction portion 10 in the optical axis orthogonal plane, which is determined by a Hall element detecting the magnetic field formed by the magnet portion 125. This determination is based on the relative position of the magnet portion 125 and the Hall element in the optical axis orthogonal plane. The magnetic sensor portion 23 has a Hall element chip assembly. The Hall element chip assembly includes: a Hall element (an example of a magnetic sensor), and a magnetic sensor substrate on which the chip of the Hall element is mounted. The magnetic sensor substrate is, for example, a printed wiring board (PWB).

[0130] A Hall element is disposed in the center of the main surface of the magnetic sensor substrate, and a substrate-side terminal portion is disposed around its periphery. The substrate-side terminal portion is connected to a substrate terminal element (an example of a substrate terminal) of the wiring component 27 disposed on the base component 25 via solder. That is, each Hall element is connected to the substrate terminal element through the magnetic sensor substrate. A substrate recess (an example of a first recess) is provided on the base component 25 for arranging each Hall element chip assembly. Each Hall element chip assembly is disposed in one of the four corner substrate recesses.

[0131] [Regarding base component 25]

[0132] The base component 25 is a square component when viewed from above, having a central opening 250 through which an optical path or optical axis passes. The base component 25 supports the lens holder 110 and the magnet holder 12a from their lower opening sides. The base component 25 is made of a non-conductive material such as synthetic resin, for example, liquid crystal polymer (LCP). A wiring component 27 is embedded in the base component 25.

[0133] Wiring component 27 is a metal plate-shaped component that is inserted into the base component 25. Wiring component 27 is made of conductive materials such as beryllium copper, nickel copper, or stainless steel.

[0134] Wiring component 27 includes coil terminal component, substrate terminal component, and wire terminal component.

[0135] The coil terminal component includes a coil terminal element 27a1 and a coil terminal connection portion. The coil terminal element 27a1 protrudes upward from the bottom of the coil recess 252 provided in the base component 25. The coil terminal element 27a1 is directly connected to the wire of the OIS coil portion 22 disposed in the coil recess 252 by solder. The coil terminal connection portion is configured to protrude from the outer edge of the base component 25, enabling connection to an external image sensor substrate 501. The portion of the coil terminal component other than the portion protruding from or exposed in the base component 25 is embedded inside the base component 25.

[0136] The substrate terminal component includes a substrate terminal element and a substrate terminal connection portion. The substrate terminal element protrudes upward from the bottom of a substrate recess provided in the base component 25. The substrate terminal element is directly connected to the substrate-side terminal portion of the Hall element chip assembly disposed in the magnetic sensor portion 23 of the substrate recess via solder. The substrate terminal connection portion is configured to protrude from the outer edge of the base component 25, enabling connection to an external image sensor substrate 501. The portion of the substrate terminal component other than the portion protruding from or exposed in the base component 25 is embedded inside the base component 25.

[0137] The wire terminal component includes wire terminal elements and wire terminal connectors. The wire terminal elements are arranged to protrude upwards and downwards from the four corners of the base component 25, and are directly connected to the lower end of a suspension wire 30 inserted into a through-hole formed on the wire terminal element itself via solder. The wire terminal connectors are configured to protrude from the outer edge of the base component 25, enabling connection to an external image sensor substrate 501. The portion of the wire terminal component other than the portion protruding from or exposed on the base component 25 is embedded within the base component 25.

[0138] [Regarding protective component 24]

[0139] The protective member 24 is provided to cover the area surrounding the central opening 250 in the base member 25. The protective member 24 is a thin plate or film member made of a non-conductive material such as resin. To completely cover the area where the OIS coil section 22 is positioned, the protective member 24 is positioned between the OIS coil section 22 and the magnet section 125 in the Z direction. This prevents collisions between the OIS coil section 22 and the magnet section 125 caused by external impacts. Furthermore, it prevents short circuits caused by contact between the metal lower leaf spring member 13b and the metal OIS coil section 22.

[0140] [Regarding suspension line 30]

[0141] The suspension wire 30 is an elastic rod-shaped component extending along the Z direction. Each of the four corners of the magnet support 12a is configured with a group of two suspension wires 30. It should be noted that the suspension wires 30 can also be configured with a group of three or more suspension wires 30 corresponding to each of the four corners of the magnet support 12a. In each suspension wire 30, one end (lower end) is fixed to the OIS base 20, and the other end (upper end) is fixed to the OIS correction part 10 (specifically, the upper leaf spring part 13a). The OIS correction part 10 is supported by the suspension wires 30 in a swingable manner within the plane orthogonal to the optical axis.

[0142] The suspension wires 30 extend between the base member 25 and the upper leaf spring member 13a, supporting the magnet bracket 12a. Each set of suspension wires 30 located at one of the four corners of the magnet bracket 12a is connected to the same upper leaf spring member 13a. These sets of suspension wires 30 at each of the four corners of the magnet bracket 12a are arranged equidistant from the optical axis of the lens section 2.

[0143] Here, a pair of suspension wires 30 are arranged corresponding to each of the four corners. With this arrangement, compared to the case where only one suspension wire 30 is arranged corresponding to each of the four corners, even if the spring constant of each suspension wire 30 is reduced (in other words, even if the flexibility is increased), the same weight of the OIS correction unit 10 can be supported. Thus, both stable support performance and oscillation performance under vibration correction can be achieved. Furthermore, since stress is less likely to concentrate in each suspension wire 30, durability can also be improved.

[0144] The suspension wires 30, which are arranged corresponding to each of the four corners, are used, either entirely or selectively, as power supply paths to the AF coil section 111. It should be noted that the number of suspension wires 30 is not limited to 8; more than 8 may be used as long as the performance of swingably supporting the OIS correction section 10 can be maintained.

[0145] [Detailed structure of the upper leaf spring component 13a]

[0146] Figure 8 This is a top view showing the upper leaf spring component 13a as viewed from above. Figure 9 It is the upper leaf spring component 13a Figure 8 The enlarged top view is shown in section A.

[0147] The upper leaf spring component 13a has: a lens bracket side connecting portion 13a1 serving as a movable part side connecting portion, a magnet bracket side connecting portion 13a2 serving as a receiving part side connecting portion, and a suspension wire side connecting portion 13a3 serving as a wire component side connecting portion. The upper leaf spring component 13a is mainly separated into two parts. Each half of the two upper leaf spring components 13a is composed of one lens bracket side connecting portion 13a1, two magnet bracket side connecting portions 13a2, and two suspension wire side connecting portions 13a3.

[0148] The lens holder side connecting portion 13a1 is connected to the lens holder 110 via two first connecting portions 13a11. Extending from the first connecting portion 13a11 of the lens holder side connecting portion 13a11 along the curve of the lens holder 110 are a first arm portion 13a12 on one side and a second arm portion 13a13 on the other side.

[0149] The magnet bracket side connecting portion 13a2 connects to the magnet bracket 12a on the Z-direction + side of the slot where the suspension wire 30 is disposed. Four magnet bracket side connecting portions 13a2 are formed around the four corners of the magnet bracket 12a, spanning two adjacent sides of the magnet bracket 12a. The magnet bracket side connecting portion 13a2 includes: two second connecting portions 13a21, two extension portions 13a22, a connecting portion 13a23, and a reinforcing portion 13a24. Each second connecting portion 13a21 connects to the magnet bracket 12a at the upper part of the side near the four corners of the magnet bracket 12a. The two extension portions 13a22 extend from the second connecting portions 13a21 towards each of the four corners of the magnet bracket 12a on two adjacent sides of the magnet bracket 12a. The connecting portion 13a23 joins the two adjacent extension portions 13a22 together at each of the four corners of the magnet bracket 12a. The reinforcing part 13a24 connects the two second connecting parts 13a21 of a magnet support side connecting part 13a2 in a straight line with the closest distance between them, thereby reinforcing while ensuring conductivity.

[0150] The suspension wire side connection 13a3 is connected to the upper end of the suspension wire 30 by solder. The suspension wire side connection 13a3 formed at each of the four corners of the magnet bracket 12a is connected to the same magnet bracket side connection 13a2, so that the suspension wires 30 at the four corners form a single electrical path.

[0151] The suspension wire side connection portion 13a3 includes: two bridging portions 13a31 and a pair of third connecting portions 13a32. The two bridging portions 13a31 bridge from the joint portion 13a23 to each of the suspension wires 30 in the group of suspension wires 30 arranged at each of the four corners of the magnet bracket 12a. The width of the bridging portion 13a31 in the direction intersecting the direction connecting the joint portion 13a23 and the suspension wire 30 is formed to be a constant width smaller than the width of the portion surrounding the third connecting portion 13a32. The pair of third connecting portions 13a32 are respectively connected to each of the suspension wires 30 in the group of suspension wires 30 at the front ends of the two bridging portions 13a31. It should be noted that the number of bridging portions 13a31 and third connecting portions 13a32 need only be equal to the number of suspension wires 30 in the group of suspension wires 30.

[0152] When a pair of third connecting parts 13a32 are integrated, after soldering one third connecting part 13a32 to one suspension wire 30, when soldering the other third connecting part 13a32 to the other suspension wire 30, heat may be transferred through the connection of the pair of third connecting parts 13a32 to the previously soldered solder, potentially causing it to remelt. Therefore, the connection method needs to be adjusted. In contrast, the pair of third connecting parts 13a32 are separated and independent, for example, by two bridging parts 13a31 separated in a slit shape, thus allowing for simple connection.

[0153] <Variation Example 1>

[0154] Figure 10 It is the upper leaf spring component 13a of modified example 1. Figure 8 The enlarged top view of part A is shown. In Modification 1, the same reference numerals are assigned to the same structures as in the embodiments of the present invention described above, and these reference numerals are omitted; their characteristic parts are described.

[0155] The suspension wire side connection portion 13a3 includes: a bridging portion 13a31 and a pair of third connecting portions 13a32. The bridging portion 13a31 bridges the suspension wires 30 arranged at each of the four corners of the magnet bracket 12a. The width of the bridging portion 13a31, in the direction intersecting the direction connecting the joint 13a23 and the suspension wire 30, is formed to be a constant width smaller than the width of the portion surrounding the plurality of connecting portions. The pair of third connecting portions 13a32 connect to each suspension wire 30 in the suspension wire 30 group at the front end of the bridging portion 13a31. The pair of third connecting portions 13a32 are integrated. By using a single bridging portion 13a31 and integrating the pair of third connecting portions 13a32, the displacement of the suspension wires 30 can be further reduced. It should be noted that the number of third connecting parts 13a32 only needs to be equal to the number of suspension wires 30 in the group of suspension wires 30.

[0156] <Variation Example 2>

[0157] Figure 11 It is the upper leaf spring component 13a of modified example 2. Figure 8 The enlarged top view of part A is shown. In Modification 2, the same reference numerals are used for structures identical to those in the embodiments of the present invention described above, and these reference numerals are omitted; their characteristic parts are described.

[0158] The suspension wires 30 arranged at each of the four corners of the magnet bracket 12a are arranged radially. The diameter of the suspension wires 30 farther from the optical axis of the lens section 2 is larger than that of the suspension wires 30 closer to the optical axis of the lens section 2, or bundled or stranded wire components are used. According to this structure, the strength of the suspension wires 30 farther from the optical axis of the lens section 2, which are easier to stress than the suspension wires 30 closer to the optical axis of the lens section 2, can be improved. Here, the arrangement of the suspension wires 30 is represented by the arrangement of the two third connecting parts 13a32 in the suspension wire side connecting part 13a3 of the upper leaf spring member 13a. It should be noted that there is no bridging part 13a31 in the suspension wire side connecting part 13a3 here, and the two third connecting parts 13a32 are arranged radially in the lens section 2.

[0159] <Postscript>

[0160] The above implementation methods and variations are summarized below.

[0161] The optical element driving device 1 includes a lens holder 110 capable of holding the lens section 2. The optical element driving device 1 also includes a cylindrical magnet holder 12a, which is rectangular in shape when viewed from above, surrounding and housing the lens holder 110. The optical element driving device 1 includes a base member 25, which is disposed on one side of the lens holder 110 and the magnet holder 12a in the optical axis direction. The optical element driving device 1 includes an upper leaf spring member 13a, which supports the lens holder 110 in such a way that it can move relative to the magnet holder 12a in the optical axis direction. The optical element driving device 1 includes a suspension wire 30, which supports the magnet holder 12a in such a way that it can move relative to the base member 25 in a direction orthogonal to the optical axis. The suspension wire 30 is configured such that a group of wires consisting of two or more wire members is disposed at each of the four corners of the magnet holder 12a and connected to a common leaf spring member 13a.

[0162] According to this structure, at each of the four corners of the magnet bracket 12a, two or more suspension wires 30 are arranged in groups. Therefore, the spring constant of each suspension wire 30 can be reduced, and the stress applied to each suspension wire 30 can be reduced. Thus, breakage of the suspension wires 30 can be suppressed. Furthermore, since each of the four corners of the magnet bracket 12a has groups of two suspension wires 30 connected to the same upper leaf spring member 13a, these groups of suspension wires 30 form a single electrical path, improving the stability of the electrical connection.

[0163] The upper leaf spring component 13a has a magnet bracket side connecting portion 13a2 at each of the four corners of the magnet bracket 12a, which is connected to the magnet bracket 12a. The magnet bracket side connecting portion 13a2 includes two extension portions 13a22 extending along two adjacent sides of the magnet bracket 12a. The magnet bracket side connecting portion 13a22 includes a connecting portion 13a23 at the corresponding corner where the two extension portions 13a22 are joined together.

[0164] According to this structure, since the connecting portion 13a23 joins the two extension portions 13a22 together, unwanted movement of the upper leaf spring member 13a around the magnet support side connecting portion 13a2 can be suppressed. Furthermore, the connection to the suspension wire 30 assembly at the connecting portion 13a23, and the reinforcement of the periphery of the suspension wire 30 assembly by the two extension portions 13a22 and the connecting portion 13a23 connecting these extension portions 13a22, prevents excessive bouncing of the suspension wire 30 assembly.

[0165] The upper leaf spring component 13a has a suspension wire side connection portion 13a3 at each of the four corners of the magnet bracket 12a, which is connected to the suspension wire 30. The suspension wire side connection portion 13a3 includes a single bridging portion 13a31 that bridges all suspension wires 30 contained in the corresponding wire group from the connecting portion 13a23. The suspension wire side connection portion 13a3 includes a plurality of third connection portions 13a32 that are respectively connected to each suspension wire 30 in the corresponding wire group at the front end of the single bridging portion 13a31.

[0166] According to this structure, the suspension wire 30 is connected to a plurality of third connecting parts 13a32 by a bridging part 13a31, thus suppressing the displacement of the suspension wire 30.

[0167] The upper leaf spring component 13a has a suspension wire side connection portion 13a3 at each of the four corners of the magnet bracket 12a, which is connected to the suspension wire 30. The suspension wire side connection portion 13a3 includes multiple bridging portions 13a31 that are individually bridged from the connecting portion 13a23 to all the suspension wires 30 contained in the corresponding wire group. The suspension wire side connection portion 13a3 has multiple third connection portions 13a32 that are respectively connected at the front end of the multiple bridging portions 13a31 to each of the suspension wires 30 in the corresponding wire group.

[0168] According to this structure, since multiple bridging portions 13a31 are provided from the joint portion 13a23 to the suspension wires 30 arranged at each of the four corners of the magnet bracket 12a, the upper leaf spring member 13a can easily deform according to the state of each suspension wire 30, thereby reducing the stress applied to each suspension wire 30.

[0169] At each of the four corners of the magnet bracket 12a, all the suspension wires 30 contained in the wire assembly are arranged radially.

[0170] According to this structure, the groups of suspension wires 30 are arranged along the direction of movement, therefore, there is no need for components to prevent the suspension wires 30 from contacting each other.

[0171] Camera module A includes an optical element driving device 1. Camera module A includes a lens unit 2. Camera module A includes an imaging unit for capturing an image of a subject imaged by the lens unit 2.

[0172] According to this structure, the shaking of the lens section 2 can be suppressed, and the camera section can capture a clear image of the subject.

[0173] The camera mounting device is a camera mounting device used as information equipment or transportation equipment. The camera mounting device includes a camera module A. The camera mounting device also includes an image processing unit that processes the image information obtained from the camera module A.

[0174] According to this structure, the shaking of the lens section 2 can be suppressed, and the image processing section can process the image information of the clear photographed object.

[0175] <Other>

[0176] Furthermore, the above embodiments are merely examples of specific implementations of the present invention, and the technical scope of the present invention should not be limited to these embodiments. That is, the present invention can be implemented in various forms without departing from its essential points or main features. For example, the upper leaf spring component 13a can be separated into two parts to form a half-body, but it can also be separated into more parts.

Claims

1. An optical element driving device, characterized in that, have: The movable part is able to hold the optical elements; The cylindrical receiving part, which is rectangular in shape when viewed from above, surrounds the outer periphery of the movable part and accommodates the movable part; The fixed part is disposed on one side of the optical axis relative to the movable part and the receiving part; A leaf spring component supports the movable part in such a way that the movable part can move relative to the receiving part in the optical axis direction; and The linear component supports the receiving portion in a manner that allows the receiving portion to move relative to the fixing portion in a direction orthogonal to the optical axis. The wire component is arranged as a wire group consisting of two or more wire components at each of the four corners of the receiving part. The two or more wire components are connected to the common straight joint via multiple bridging portions extending radially inward from the common straight joint, thereby connecting to the common leaf spring component.

2. The optical element driving device as claimed in claim 1, wherein, The leaf spring component has two extensions at each corner that are connected to the receiving portion and extend along two adjacent sides of the receiving portion. The straight joint connects the two extensions to each other at each corner.

3. The optical element driving device as claimed in claim 1, wherein, The multiple bridging portions are formed such that the width of the direction intersecting the direction connecting the straight joint and the line component is a constant width.

4. The optical element driving device as claimed in claim 1, wherein, The straight joint extends in a straight line along the direction in which the two or more line components are arranged.

5. A camera module, characterized in that, have: The optical element driving device according to claim 1; The optical element; and The camera unit captures images of the subject that are imaged through the optical element.

6. A camera mounting device, which is an information device or a transport device, characterized in that it comprises: The camera module as described in claim 5; and The image processing unit processes the image information obtained from the camera module.

Images