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

Abstract

An optical element driving device is provided with: a holding unit capable of holding an optical element; a fixing part that movably supports the holding part via a support member; a drive unit that has a first magnet disposed on one of the holding unit and the fixing unit and a first coil disposed on the other of the holding unit and the fixing unit, and that moves the holding unit; a first yoke that is disposed on the other side so as to face the first magnet, and that urges the holding section toward the support member; and an adjusting part which has a second magnet disposed on one of the holding part and the fixing part and a second coil disposed on the other of the holding part and the fixing part, and which adjusts an urging force that urges the holding part toward the support member.

Description

Technical Field

[0001] The present invention relates to an optical element driving device for driving an optical element, a camera module, and a camera mounting device. Background Art

[0002] Generally, a camera module is mounted in a camera-mounted device such as a smartphone or a drone. In such a camera module, an optical element driving device for driving an optical element is used. In addition, a drone is a drone that can be flown by remote operation or automatic control, and is sometimes also called a multi-rotor aircraft.

[0003] The optical element driving device has an auto focus function (hereinafter referred to as “AF function”, AF: Auto Focus) etc. The optical element driving device automatically performs focusing when photographing a subject by the AF function.

[0004] As an optical element driving device having such an AF function, for example, Patent Document 1 discloses a lens driving device that accommodates a lens barrel having a lens in a housing and includes a driving unit that drives the lens barrel in the optical axis direction.

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2011-197626 Summary of the invention

[0008] Problems to be solved by the invention

[0009] In the lens driving device shown in Patent Document 1, a guide ball (support member) that supports the lens barrel so as to be movable along the optical axis is arranged between the housing and the lens barrel. The guide ball is held between the housing and the lens barrel by the magnetic force between a magnet constituting a driving portion fixed to the lens barrel and a yoke fixed to the housing.

[0010] In recent years, in order to improve the image quality of camera modules, the image sensors have tended to have larger apertures, and along with this, the lens size has tended to have larger apertures. If the lens size is larger, it is necessary to increase the driving force for driving the lens barrel, and therefore, it is necessary to increase the magnetic force of the magnet itself for driving the lens barrel.

[0011] If the magnetic force of the magnet itself increases, the magnetic force between the magnet and the yoke also increases. Therefore, the force of the housing and the lens barrel to push the guide ball increases, and the friction force with the guide ball increases, which may hinder the movement of the lens barrel.

[0012] An object of the present invention is to provide an optical element driving device, a camera module, and a camera mounting device capable of smoothly moving a member holding a lens.

[0013] Solutions to Solve Problems

[0014] The optical element driving device involved in the present invention comprises: a holding portion, which is capable of holding an optical element; a fixing portion, which movably supports the holding portion via a supporting component; a driving portion, which has a first magnet arranged on one side of the holding portion and the fixing portion and a first coil arranged on the other side, and moves the holding portion; a first yoke, which is arranged on the other side opposite to the first magnet, and applies a force to the holding portion toward the supporting component; and an adjusting portion, which has a second magnet arranged on one side of the holding portion and the fixing portion and a second coil arranged on the other side, and adjusts the force applied to the holding portion toward the supporting component.

[0015] A camera module according to the present invention includes: the optical element driving device; and an imaging unit that captures an image of a subject using the optical element.

[0016] The camera-mounted device according to the present invention is an information device or a transportation device, and includes: the camera module; and an image processing unit that processes image information obtained by the camera module.

[0017] Effects of the Invention

[0018] According to the present invention, it is possible to smoothly move the member that holds the lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1A It is a front view showing a smartphone equipped with a camera module according to an embodiment of the present invention.

[0020] Figure 1B yes Figure 1A Rear view of the smartphone shown.

[0021] Figure 2 It is a perspective view showing a camera module and an imaging unit.

[0022] Figure 3 yes Figure 2 A top view of an optical element driving device main body included in the optical element driving device of the camera module shown.

[0023] Figure 4 Yes means Figure 3 A three-dimensional view of the holding portion of the optical element driving device main body is shown.

[0024] Figure 5Yes means Figure 3 The diagram of the housing portion of the optical element driving device main body shown is a perspective view showing a state where the substrate portion is removed.

[0025] Figure 6 Yes means Figure 3 The view of the housing portion of the optical element driving device main body shown is a perspective view showing a state where the substrate portion is mounted.

[0026] Fig. 7A This is a front view of a car as a camera mounting device on which the vehicle-mounted camera module is mounted.

[0027] Figure 7B Observed from the rear side Fig. 7A A perspective view of the car shown. DETAILED DESCRIPTION

[0028] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

[0029] [Smartphone]

[0030] Figure 1A and Figure 1B The diagram shows a smartphone M (an example of a camera-mounted device) equipped with a camera module A according to the present embodiment. Figure 1A is the main view of smartphone M, Figure 1B is a rear view of the smartphone M.

[0031] The smartphone M has a dual camera including two rear cameras OC1 and OC2. In the present embodiment, the camera module A is applied to the rear cameras OC1 and OC2.

[0032] The camera module A has an AF function, which can automatically focus when photographing a subject. In addition, the camera module A can also have a shake correction function (hereinafter referred to as "OIS function"; OIS: Optical Image Stabilization). The OIS function can optically correct the shake (vibration) generated during shooting and shoot an image without image shake.

[0033] [Camera module]

[0034] Figure 2 It is a perspective view showing the camera module A and the imaging unit 5 . Figure 3 yes Figure 2 FIG. 1 is a top view of an optical element driving device main body 4 of an optical element driving device 1 of a camera module A. Figure 2 and Figure 3As shown, in this embodiment, the description is made using the orthogonal coordinate system (X, Y, Z). In addition, in the drawings described later, the description is also made using the orthogonal coordinate system (X, Y, Z).

[0035] For example, when the camera module A is taken by a smartphone M, the X direction is mounted in a vertical direction (or horizontal direction), the Y direction is horizontal direction (or vertical direction), and the Z direction is front-back direction. Figure 2 The optical axis direction of the optical axis OA of the lens portion 2 shown in FIG. Figure 2 In the figure, the upper side (+Z side) is the light receiving side in the optical axis direction, and the lower side (-Z side) is the image forming side in the optical axis direction. In addition, hereinafter, the X direction and the Y direction orthogonal to the Z axis are referred to as "directions orthogonal to the optical axis", and the XY plane is referred to as the "plane orthogonal to the optical axis". In addition, the direction orthogonal to the optical axis is referred to as the "radial direction".

[0036] In addition, the optical axis OA is used for the following description, but the optical axis direction of the optical axis OA may be referred to as the optical path direction or the focus direction (the direction for adjusting the focus) according to the type of the optical element. Here, the passage of light formed by the opening 301 of the cover 3 described later, the opening 11 of the holding portion 10 described later, or the storage opening 21 of the storage portion 20 described later is the optical path, and the extension direction of the optical path (the penetration direction of each opening) is the optical path direction.

[0037] like Figure 2 As shown, the camera module A includes an optical element driving device 1 that realizes an AF function, a lens unit 2 in which a lens is housed in a cylindrical lens barrel, and a photographing unit 5 that photographs a subject image formed by the lens unit 2. That is, the optical element driving device 1 is a so-called lens driving device that drives the lens unit 2 as an optical element.

[0038] [cover]

[0039] In the optical element driving device 1, the outer side of the optical element driving device body 4 is covered by a cover 3. The cover 3 is a covered quadrangular cylindrical body that is roughly rectangular when viewed from the Z direction. In the present embodiment, the cover 3 has a roughly square shape when viewed from above. The cover 3 has a roughly circular opening 301 on the upper surface. The lens part 2 is configured so that the opening 11 of the holding part 10 housed in the optical element driving device body 4 faces the outside from the opening 301 of the cover 3, and protrudes further to the light receiving side than the opening surface of the cover 3 as it moves in the Z direction. The inner wall of the cover 3 is fixed to the storage part 20 of the optical element driving device body 4 by, for example, bonding, etc., and stores the optical element driving device body 4.

[0040] The cover 3 includes a member for shielding electromagnetic waves from the outside of the optical element driving device 1 and the inside of the cover 3 , for example, a shielding member made of a magnetic body.

[0041] [Photography Department]

[0042] The imaging unit 5 is arranged on the imaging 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 composed of, for example, a CCD (charge-coupled device) type image sensor, a CMOS (complementary metal oxide semiconductor) type image sensor, etc., and captures the subject image formed by the lens unit 2.

[0043] The control unit 503 is composed of, for example, a control IC, and performs driving control of the optical element driving device 1. The optical element driving device 1 is mounted on the image sensor substrate 501 and is mechanically and electrically connected. The control unit 503 can be provided on the image sensor substrate 501, or on a camera-mounted device (a smartphone M in this embodiment) that mounts the camera module A.

[0044] In addition, Figure 2 In the embodiment, the lens unit 2 is driven in the Z direction by the optical element driving device 1 relative to the image sensor substrate 501 whose position is fixed, thereby forming a subject image on the imaging element 502. However, for example, the imaging element 502 may be driven in the Z direction. In this case, the lens unit 2 is fixed to the cover 3, and the imaging element 502 as an optical element is driven in the Z direction by the optical element driving device 1, thereby forming a subject image on the imaging element 502.

[0045] [Optical element drive device main body]

[0046] The optical element driving device body 4 is a main part of the optical element driving device 1 that drives the lens unit 2 as an optical element in the Z direction. In addition, for the sake of convenience, the following description is based on the premise that the optical element driving device 1 drives the lens unit 2, but as mentioned above, the optical element driving device 1 can also drive the imaging element 502.

[0047] like Figure 3 As shown, the optical element driving device main body 4 includes a holding portion 10 , a storage portion 20 , a support portion 30 , a driving portion 40 , a biasing portion 50 , adjustment portions 60A and 60B, a substrate portion 70 , and the like.

[0048] Regarding the holding portion 10, the storage portion 20, the support portion 30, the drive portion 40, the adjustment portions 60A and 60B, and the substrate portion 70 of the optical element driving device main body 4, Figure 3 Refer to Figures 4 to 6 Provide explanation. Figure 4 Yes means Figure 3 1 is a perspective view of the holding portion 10 of the optical element driving device main body 4 shown.

[0049] Figure 5 Yes means Figure 3 The diagram of the housing portion 20 of the optical element driving device main body 4 is a perspective view showing a state where the base plate portion 70 is removed. Figure 6 Yes means Figure 3 The diagram of the housing portion 20 of the optical element driving device main body 4 is a perspective view showing a state where the substrate portion 70 is mounted.

[0050] [Maintenance Department]

[0051] The holding portion 10 has a frame portion 12 having an opening 11 formed in the center. The opening 11 is configured to allow Figure 2 The lens unit 2 shown is held inside. For example, the opening 11 is configured to hold the lens unit 2 on the inner peripheral surface by forming a mounting groove or the like on the inner peripheral surface. In this way, the holding portion 10 surrounds the outer periphery of the lens unit 2 and holds the lens unit 2.

[0052] The outer peripheral surface 13 of the frame 12 is provided with grooves 14 extending in the Z direction at multiple locations. For example, the outer shape of the holding portion 10 is rectangular in plan view, and grooves 14 are provided at two locations on the first outer surface 13a corresponding to one side of the rectangle.

[0053] The groove 14 is provided corresponding to a shaft member 31 to be described later extending in the Z direction, and the groove 14 and the shaft member 31 constitute the support portion 30. Here, the groove 14 is formed as a groove with a semicircular cross section corresponding to the shape of the cylindrical shaft member 31, and is configured to be slidably in contact with the shaft member 31 in the Z direction. The holding portion 10 is supported by the support portion 30 so as to be movable in the Z direction.

[0054] The frame 12 is provided with a magnet 41 constituting a driving unit 40. Specifically, the magnet 41 is mounted on the recess 15 provided on the first outer surface 13a. The holding unit 10 is configured to be movable in the Z direction by the driving unit 40 including the magnet 41 and a coil 42 described later.

[0055] In addition, the opening 11 is formed in a cylindrical shape corresponding to the cylindrical lens portion 2 , but can be changed to an appropriate shape corresponding to the shape of the lens portion 2 .

[0056] In addition, when the optical element driving device 1 drives the imaging element 502, the holding portion 10 may not have the opening portion 11, that is, the holding portion 10 may not be a frame portion. In this case, for example, the imaging element 502 can be held on the upper surface (the surface on the light receiving side) of the holding portion 10.

[0057] [Storage Department]

[0058] The storage portion 20 (fixing portion in the present invention) includes a frame portion 22 having a storage opening 21 formed in the center. The storage opening 21 is configured to surround the outer periphery of the holding portion 10 and to be able to store the holding portion 10 inside.

[0059] The inner side of the storage opening 21, that is, the inner peripheral surface 23, is formed to correspond to the shape of the outer peripheral surface 13 of the holding portion 10 in a plan view. In the inner peripheral surface 23, a shaft member 31 constituting the support portion 30 is provided on the first inner surface 23a side opposite to the first outer surface 13a of the holding portion 10. Specifically, as Figure 5 and Figure 6 As shown, a cylindrical shaft member 31 extending in the Z direction is provided in an upright manner at the bottom 27 of the storage opening 21. The storage portion 20 supports the holding portion 10 movably in the Z direction via a plurality of support portions 30 having grooves 14 and shaft members.

[0060] In addition, in the frame portion 22 of the storage portion 20, a coil 42 constituting the drive portion 40 is provided at the first side portion 22a opposite to the first outer surface 13a. The coil 42 is energized, and the drive portion 40 moves the holding portion 10 in the Z direction relative to the storage portion 20 through the interaction between the energized current and the magnetic field of the magnet 41. The holding portion 10 functions as a movable portion driven by the drive portion 40, and the storage portion 20 functions as a fixed portion relative to the holding portion 10.

[0061] In addition, Figure 3 In the figure, the shapes of the outer peripheral surface 13 of the holding portion 10 and the inner peripheral surface 23 of the storage opening 21 are just examples, and can be appropriately changed according to, for example, the arrangement of the support portion 30 and the drive portion 40 .

[0062] [Supporting part]

[0063] The support portion 30 supports the holding portion 10 so as to be movable in the Z direction relative to the storage portion 20. As an example, Figure 3 As shown, the support portion 30 is disposed at two different positions in the circumferential direction of the outer peripheral surface 13 and the inner peripheral surface 23 in a plan view. More specifically, the support portion 30 is disposed on the first outer surface 13a and the first inner surface 23a facing each other so as to sandwich the driving portion 40 therebetween.

[0064] As an example, the support portion 30 includes the groove portion 14 of the holding portion 10 and the shaft member 31 (the support member in the present invention). As described above, the groove portion 14 is configured to be in contact with the shaft member 31 so as to be slidable in the Z direction.

[0065] In addition, in the present embodiment, as described later, in the force applying portion 50 having the magnet 41 and the yoke 51, the magnet 41 magnetically attracts the yoke 51, thereby applying force to the groove portion 14 toward the shaft member 31. That is, the force applying portion 50 applies a force in the -X direction to the holding portion 10 by the magnetic force Fa (the first magnetic force in the present invention), and applies force to the holding portion 10 toward the shaft member 31. Thus, the support portion 30 holds the holding portion 10 like a so-called cantilever support structure.

[0066] As described above, the support portion 30 includes the groove portion 14 extending in the Z direction and the shaft member 31 , and the urging portion 50 urges the groove portion 14 toward the shaft member 31 , thereby suppressing the inclination (tilt) of the holding portion 10 .

[0067] In addition, the shaft member 31 is arranged at the bottom 27 of the storage opening 21 and is fixed to the storage portion 20 side that functions as a fixing portion relative to the retaining portion 10, so when the later-described force F relative to the shaft member 31 is adjusted, stable movement of the retaining portion 10 can be achieved.

[0068] Furthermore, since the groove portion 14 is configured to be in contact with the shaft member 31 so as to be slidable in the Z direction, the storage portion 20 can support the holding portion 10 via the support portion 30 so as to be movable in the Z direction.

[0069] It should be noted that, here, as an example, the support portion 30 is a structure in which the holding portion 10 has the groove portion 14 and the storage portion 20 has the shaft member 31 , but the holding portion 10 may also have the shaft member 31 and the storage portion 20 may have the groove portion 14 .

[0070] The shaft member 31 may be any other member as long as it is a structure that the groove 14 can slidably contact. For example, a protrusion that protrudes inward from the inner peripheral surface 23 of the storage portion 20 and extends in the Z direction may be provided, and the groove 14 can slidably contact the protrusion.

[0071] The groove portion 14 is not limited to a groove having a semicircular cross section, and may be a groove having a V-shaped cross section, a U-shaped cross section, or the like, as long as it can slidably contact the shaft member 31 .

[0072] [Drive unit]

[0073] The driving unit 40 is an actuator that drives the holding unit 10 in the Z direction relative to the storage unit 20. Figure 3 As shown, the driving portion 40 is disposed between the supporting portions 30 disposed at two locations.

[0074] The driving unit 40 includes a magnet 41 (first magnet in the present invention) mounted on the holding unit 10 and a coil 42 (first coil in the present invention) mounted on the storage unit 20. The driving unit 40 having such a structure functions as a moving magnet type voice coil motor (VCM).

[0075] As described above, the magnet 41 is attached to the recessed portion 15 provided on the first outer surface 13 a of the holding portion 10 .

[0076] The coil 42 is mounted on the first side portion 22a of the storage portion 20. Specifically, Figure 5 As shown in FIG. 1 , the coil 42 is mounted on a surface that becomes the inner side of the substrate portion 70 (substrate 71) described later. Figure 6 As shown, when the substrate 70 is mounted on the outer peripheral surface 24 of the storage portion 20, the coil 42 is arranged in the through portion 25 that penetrates the frame portion 22 of the storage portion 20. When the holding portion 10 is stored in the storage portion 20, the magnet 41 and the coil 42 are separated and arranged to face each other in the radial direction.

[0077] The coil 42 is composed of a winding wound around the winding axis along the X direction. The magnet 41 is magnetized to form a magnetic field that radially crosses the coil 42, for example, with the +Z direction side being the S pole and the -Z direction side being the N pole.

[0078] When power is not supplied to the coil 42 (when power is not supplied), the holding portion 10 is supported at the reference position (self-holding) by a force generated by, for example, a magnetic force Fa of a force applying portion 50 described later (magnetic force of the magnet 41 magnetically attracting the yoke 51). When power is supplied to the coil 42 (when power is supplied) through wiring (not shown), the Lorentz force is generated in the coil 42 by the interaction between the current flowing in the coil 42 and the magnetic field of the magnet 41.

[0079] The direction of the Lorentz force is the Z direction, which is a direction orthogonal to the direction of the magnetic field of the magnet 41 and the direction of the current flowing in the coil 42. The coil 42 is fixed to the storage portion 20, so a reaction force acts on the magnet 41, and this reaction force becomes the driving force of the VCM. When the direction and magnitude of the current flowing through the coil 42 are controlled, the holding portion 10 having the magnet 41 moves to the light receiving side in the optical axis direction or the imaging side in the optical axis direction relative to the above-mentioned reference position to perform focusing.

[0080] Although not shown in the figure, a Z position detection unit for detecting the Z direction position of the holding unit 10 relative to the storage unit 20 is provided in the substrate unit 70 described later. The optical element driving device 1 controls the direction and magnitude of the current flowing through the coil 42 based on the Z direction position detected by the Z position detection unit. As the Z position detection unit, for example, a magnet for detecting the position and a Hall sensor for detecting the magnetic field of the magnet are used.

[0081] The optical element driving device 1 can drive the lens unit 2 together with the holding unit 10 in the Z direction by means of the supporting unit 30 and the driving unit 40 , thereby realizing the AF function.

[0082] In addition, here, the holding portion 10 is configured to be movable in the Z direction by one driving portion 40 , but may be configured to be movable in the Z direction by a plurality of driving portions 40 .

[0083] [Force Application]

[0084] The force applying portion 50 applies force to the holding portion 10 relative to the shaft member 31 provided in the storage portion 20. As an example, Figure 3 As shown, the force applying portion 50 is disposed between the support portions 30 disposed at two locations.

[0085] As an example, the urging portion 50 includes the magnet 41 of the holding portion 10 described above and a yoke 51 made of a magnetic material and attached to the storage portion 20. The magnet 41 serves both as the driving portion 40 and as the urging portion 50.

[0086] The yoke 51 is mounted on the first side portion 22a of the storage portion 20. Figure 5 As shown, the yoke 51 is mounted on the outer surface of the substrate 70 (substrate 71) described later. When the substrate 70 is mounted on the outer peripheral surface 24 of the storage portion 20 and the holding portion 10 is stored in the storage portion 20, the magnet 41 and the yoke 51 are separated and arranged in a radial direction so as to face each other.

[0087] With such a structure, the yoke 51 is magnetically attracted by the magnetic force of the magnet 41, and as a result, the holding portion 10 provided with the magnet 41 is urged toward the shaft member 31 side of the housing portion 20 provided with the yoke 51. That is, the urging portion 50 applies a force in the -X direction to the holding portion 10 by the magnetic force Fa, and urges the groove portion 14 of the holding portion 10 toward the shaft member 31.

[0088] In this way, since the groove portion 14 is urged toward the shaft member 31 by the urging portion 50 , the inclination (tilt) of the holding portion 10 can be suppressed.

[0089] In particular, when power is not supplied to the coil 42 (when power is not supplied), the holding portion 10 is supported at the reference position by the force generated by the magnetic force Fa of the urging portion 50 and is self-holding.

[0090] Here, the magnet 41 is provided on the holding portion 10 side and the coil 42 is provided on the storage portion 20 side, but the arrangement may be reversed, with the coil 42 provided on the holding portion 10 side and the magnet 41 provided on the storage portion 20 side. In this case, the yoke 51 is provided on the storage portion 20 side.

[0091] Here, the yoke 51 is magnetically attracted by the magnet 41 of the driving unit 40, but a separate magnet may be provided for magnetically attracting the yoke 51. In this case, the magnet is arranged at a position different from the magnet 41 in the holding unit 10, and the yoke 51 may be arranged corresponding to the position.

[0092] [Adjustment Department]

[0093] The adjustment parts 60A and 60B are configured to adjust the force F that urges the groove part 14 toward the shaft member 31. As an example, Figure 3 As shown, the adjustment parts 60A and 60B are arranged at different positions from the force applying part 50 in the circumferential direction of the outer peripheral surface 13 and the frame part 22 in a plan view. Here, the adjustment parts 60A and 60B are arranged at the second outer surface 13b and the second side 22b, and the third outer surface 13c and the third side 22c as positions different from the first outer surface 13a and the first side 22a where the force applying part 50 is arranged.

[0094] The adjustment portion 60A includes a magnet 61A (a second magnet in the present invention) attached to the holding portion 10 and a coil 62A (a second coil in the present invention) attached to the storage portion 20 .

[0095] Specifically, the magnet 61A is attached to a recessed portion 16A provided on the second outer surface 13 b of the holding portion 10 .

[0096] The coil 62A is mounted on the second side portion 22b of the storage portion 20. Specifically, Figure 5 As shown, the coil 62A is mounted on the inner surface of the substrate portion 70 (substrate 71). Figure 6 As shown, when the substrate portion 70 is mounted on the outer peripheral surface 24 of the storage portion 20, the coil 62A is arranged in the through portion 26A that penetrates the frame portion 22 (second side portion 22b) of the storage portion 20. When the holding portion 10 is stored in the storage portion 20, the magnet 61A and the coil 62A are separated and arranged in a manner opposite to each other in the radial direction.

[0097] The coil 62A is composed of a winding wound around the winding axis along the Y direction. The magnet 61A is magnetized to form a magnetic field that radially crosses the coil 62A, for example, with the N pole on the -X direction side and the S pole on the +X direction side.

[0098] When electric power is supplied to the coil 62A through wiring (not shown) (when energized), the Lorentz force is generated in the coil 62A due to the interaction between the current flowing through the coil 62A and the magnetic field of the magnet 61A.

[0099] The direction of the Lorentz force is the X direction, which is a direction orthogonal to the direction of the magnetic field of the magnet 61A and the direction of the current flowing in the coil 62A. The coil 62A is fixed to the storage portion 20, so the magnetic force Fb (the second magnetic force in the present invention) that acts as a reaction force acts on the magnet 61A, and the magnetic force Fb acts as an adjustment force for adjusting the action force F. The magnetic force Fa is a force acting in the -X direction, so the magnetic force Fb controls the direction and magnitude of the current flowing in the coil 62A in a manner that it acts in the +X direction.

[0100] Similarly, the adjustment portion 60B includes a magnet 61B (a second magnet in the present invention) attached to the holding portion 10 and a coil 62B (a second coil in the present invention) attached to the storage portion 20 .

[0101] Specifically, the magnet 61B is attached to the recessed portion 16B provided in the third outer surface 13 c of the holding portion 10 .

[0102] The coil 62B is mounted on the third side portion 22c of the storage portion 20. Specifically, Figure 5 As shown in FIG. 1 , the coil 62B is mounted on the inner surface of the substrate portion 70 (substrate 71). Figure 6 As shown, when the substrate portion 70 is mounted on the outer peripheral surface 24 of the storage portion 20, the coil 62B is arranged in the through portion 26B that penetrates the frame portion 22 (third side portion 22c) of the storage portion 20. When the holding portion 10 is stored in the storage portion 20, the magnet 61B and the coil 62B are separated and arranged in a manner opposite to each other in the radial direction.

[0103] The coil 62B is composed of a winding wound around the winding axis along the Y direction. The magnet 61B is magnetized to form a magnetic field that radially crosses the coil 62B, for example, with the N pole on the -X direction side and the S pole on the +X direction side.

[0104] When electric power is supplied to the coil 62B via wiring (not shown) (when energized), the Lorentz force is generated in the coil 62B due to the interaction between the current flowing in the coil 62B and the magnetic field of the magnet 61B.

[0105] The direction of the Lorentz force is the X direction, which is a direction orthogonal to the direction of the magnetic field of the magnet 61B and the direction of the current flowing in the coil 62B. The coil 62B is fixed to the storage portion 20, so the magnetic force Fc (the second magnetic force in the present invention) that acts as a reaction force acts on the magnet 61B, and this magnetic force Fc acts as an adjustment force for adjusting the action force F. The magnetic force Fa is a force acting in the -X direction, so the magnetic force Fc controls the direction and magnitude of the current flowing in the coil 62B in a manner that acts in the +X direction.

[0106] In this way, the acting force F is adjusted by providing the adjustment parts 60A and 60B that generate the magnetic forces Fb and Fc in the opposite directions to the magnetic force Fa of the urging part 50 .

[0107] For example, if the image sensor of the image sensor substrate 501 is enlarged in order to improve the image quality of the camera module A, the size of the lens unit 2 is also enlarged. When the size of the lens unit 2 is enlarged, the driving force for driving the lens unit 2 needs to be increased, and the magnetic force of the magnet 41 itself for driving the lens unit 2 needs to be increased.

[0108] As the magnetic force of the magnet 41 itself increases, the magnetic force between the magnet 41 and the yoke 51 also increases, so that the force F that urges the groove 14 toward the shaft member 31 increases, and the friction between the shaft member 31 and the groove 14 increases, which may hinder the movement of the lens unit 2.

[0109] Therefore, in the present embodiment, by providing the adjustment parts 60A and 60B having the above-described structure, the acting force F is adjusted by applying the magnetic forces Fb and Fc in the opposite directions to the magnetic force Fa of the urging part 50 .

[0110] For example, the force F before adjustment by the adjustment parts 60A and 60B is "1 / 2×Fa", but the force F becomes "1 / 2×(Fa-Fb-Fc)" by the adjustment by the adjustment parts 60A and 60B. In this way, the force F can be reduced compared to before adjustment by the adjustment by the adjustment parts 60A and 60B. As a result, the friction between the shaft member 31 and the groove part 14 is also reduced, and the lens part 2 can be moved smoothly.

[0111] Thus, in the present embodiment, by providing the adjustment parts 60A and 60B having the above-described structure, the acting force F can be adjusted. This is particularly useful when the magnetic force of the magnet 41 itself becomes large, and the lens part 2 can be moved smoothly.

[0112] In addition, here, the force applying part 50 is arranged on one side of the rectangular holding part 10 and the storage part 20, and the adjustment parts 60A and 60B are arranged on two sides orthogonal to each other sandwiching the one side. Therefore, the magnetic forces Fb and Fc of the adjustment parts 60A and 60B are only components in the opposite direction to the magnetic force Fa of the force applying part 50, and the force F can be adjusted simply and stably.

[0113] In addition, here, the force applying part 50 is arranged on one side of the rectangular holding part 10 and the storage part 20, and the adjustment parts 60A and 60B are arranged on the two sides sandwiching the one side, but it is not limited to such a structure, and the position and number of the adjustment parts 60A and 60B can be appropriately changed. For example, it is also possible to arrange one or more adjustment parts on the side opposite to the side where the force applying part 50 is arranged to adjust the force F.

[0114] In addition, here, magnets 61A and 61B are provided on the holding portion 10 side, and coils 62A and 62B are provided on the storage portion 20 side, but the configuration may be reversed, with coils 62A and 62B provided on the holding portion 10 side and magnets 61A and 61B provided on the storage portion 20 side.

[0115] In addition, the adjustment parts 60A and 60B may also have a yoke structure similar to the urging part 50. In this case, similar to the yoke 51 of the urging part 50, the yokes for the adjustment parts 60A and 60B are mounted on the outer surface of the substrate part 70 (substrate 71) so as to face the magnets 61A and 61B.

[0116] By providing the yokes for the adjustment parts 60A and 60B, the magnetic forces Fb and Fc can be strengthened, and the adjustment range of the acting force F can be expanded. Alternatively, even if the size of the magnets 61A and 61B is reduced and the magnetic force of the magnets 61A and 61B themselves is reduced, the desired magnetic forces Fb and Fc can be obtained and the acting force F can be adjusted.

[0117] [Substrate part]

[0118] The substrate 70 supplies power to the coil 42, the coil 62A, and the coil 62B. The substrate 70 includes the coil 42, the coil 62A, and the coil 62B, the yoke 51, and the substrate 71. The substrate 71 includes wiring (omitted from the figure) for supplying power to the coil 42, the coil 62A, and the coil 62B. Although not shown in the figure, as described above, the substrate 70 includes a Z position detection unit (e.g., a Hall sensor, etc.) for detecting the position of the holding unit 10 relative to the storage unit 20 in the Z direction.

[0119] The coil 42 and the coils 62A and 62B are mounted on the surface of the substrate 71 of the substrate portion 70 that becomes the inner side when mounted in the storage portion 20. Figure 5 In the example shown, the coil 42 is mounted on the inner surface of the central portion 71a which is the central part of the substrate 71, and the coils 62A and 62B are mounted on the inner surfaces of the side portions 71b and 71c on both sides of the central portion 71a.

[0120] In addition, the yoke 51 is attached to the surface of the substrate 71 of the substrate portion 70 that becomes the outer side when attached to the storage portion 20. Figure 5 In the example shown, the yoke 51 is attached to the surface that becomes the outer side of the center portion 71 a. The yoke 51 is arranged to face the coil 42 across the center portion 71 a of the substrate 71 .

[0121] In this way, substrate 70 on which coil 42 , coils 62A, 62B, and yoke 51 are arranged is attached to outer peripheral surface 24 of storage portion 20 so that coil 42 , coils 62A, 62B are arranged in through portions 25 , 26A, 26B of storage portion 20 , respectively.

[0122] In this way, by arranging the coil 42, the coils 62A, 62B, and the yoke 51 on one substrate 71, and attaching the substrate portion 70 to the outer peripheral surface 24 of the storage portion 20, the coil 42, the coils 62A, 62B, and the yoke 51 can be arranged at a desired position in the storage portion 20. As a result, the substrate portion 70 can be easily assembled to the storage portion 20, and the arrangement of the coil 42, the coils 62A, 62B, and the yoke 51 can also be easily performed, which can improve the layout property.

[0123] For example, by the control unit 503 (refer to Figure 2 ) is controlled to supply power to the substrate portion 70, thereby controlling the energization of the coil 42 and the coils 62A and 62B to move the holding portion 10 in the Z direction.

[0124] Specifically, the control unit 503 does not energize the coil 42 and the coils 62A and 62B in the reference state. In this reference state, the holding unit 10 is supported at the reference position (self-holding) by the force Fa of the urging unit 50 that magnetically attracts the yoke 51 by the magnet 41 .

[0125] When the control unit 503 moves the holding unit 10 in the Z direction, the coils 62A and 62B are energized first, and the adjustment units 60A and 60B generate magnetic forces Fb and Fc in the opposite direction to the magnetic force Fa of the urging unit 50. Thus, the urging force F is reduced compared to before the coils 62A and 62B are energized.

[0126] Then, the control unit 503 energizes the coil 42 while reducing the force F, and moves the holding unit 10 in the Z direction. At this time, since the force F is reduced, the friction between the shaft member 31 and the groove 14 is also reduced, and the lens unit 2 can be moved smoothly.

[0127] At this time, the control unit 503 may also change the magnetic forces Fb and Fc of the adjustment units 60A and 60B in consideration of the direction of gravity. For example, when the direction of gravity is in the -X direction, as the acting force F, the force generated by the self-weight of the lens unit 2 and the holding unit 10 is added to the force generated by the magnetic force Fa of the force-applying unit 50. Therefore, the force generated by the self-weight of the lens unit 2 and the holding unit 10 is considered, and the magnetic forces Fb and Fc of the adjustment units 60A and 60B are increased. On the other hand, when the direction of gravity is in the +X direction, as the acting force F, a force obtained by subtracting the force generated by the self-weight of the lens unit 2 and the holding unit 10 from the force generated by the magnetic force Fa of the force-applying unit 50 is applied. Therefore, the force generated by the self-weight of the lens unit 2 and the holding unit 10 is considered, and the magnetic forces Fb and Fc of the adjustment units 60A and 60B are reduced.

[0128] In addition, here, an example is described in which the control unit 503 controls the energization of the coil 42, coils 62A, and 62B, but a control unit may be separately provided on the substrate 71, and the control unit may control the energization of the coil 42, coils 62A, and 62B.

[0129] [Other embodiments]

[0130] The present invention is not limited to the above-described embodiments, and can be modified within a scope not departing from the gist of the invention.

[0131] For example, in the above embodiment, the smartphone M is used as an example for explanation, but the present invention can be applied to a camera-mounted device having a camera module and an image processing unit that processes image information obtained by the camera module. The camera-mounted device includes information equipment and transportation equipment. Information equipment includes, for example, a mobile phone with a camera, a notebook computer, a tablet terminal, a portable game console, a web camera, and a vehicle-mounted device with a camera (for example, a rear monitor device, a driving recorder device). In addition, transportation equipment includes, for example, a car, a drone, etc.

[0132] Fig. 7A , Figure 7B 1 is a diagram showing a vehicle V as a camera mounting device equipped with a vehicle-mounted camera module VC (Vehicle Camera). Fig. 7A This is the front view of the car V. Figure 7B FIG. 2 is a rear perspective view of a car V. The car V is equipped with the camera module A described in the above embodiment as a vehicle-mounted camera module VC. Fig. 7A , Figure 7B As shown, the vehicle-mounted camera module VC is mounted on the front windshield, for example, facing forward, or mounted on the rear door, facing backward. The vehicle-mounted camera module VC is used for rear monitoring, driving recorder, collision avoidance control, automatic driving control, and the like.

[0133] In the above embodiment, the optical element driving device 1 that drives the lens unit 2 is described as an optical element, but the optical element to be driven may be an optical element other than a lens such as a reflector or a prism, or may be an optical element such as the imaging element 502. In this case, the opening 11 of the holding portion 10 may be changed in shape according to the shape of the optical element to be mounted, or may be eliminated according to circumstances.

[0134] Furthermore, in the above-described embodiment, the optical element driving device 1 has the AF function, but may have not only the AF function but also a function of moving the lens unit 2 in the Z direction, such as a zoom function.

[0135] In addition, in the above embodiment, the optical element driving device 1 having the AF function is described as an example, but the optical element driving device 1 may also have the OIS function. In the case of having the OIS function, the optical element driving device 1 includes: a base that supports the storage portion 20 movably in the X direction and the Y direction via the OIS support portion; and an OIS driving portion that drives the storage portion 20 in the X direction and the Y direction relative to the base. In this case, the OIS support portion arranged between the storage portion 20 and the base may be provided with a force applying portion and an adjustment portion having the same structure as the force applying portion 50 and the adjustment portion 60A, 60B, and the force acting on the OIS support portion may also be adjusted as described above.

[0136] The above is a description of the embodiments of the present invention. In addition, the above description is an illustration of a preferred embodiment of the present invention, and the scope of the present invention is not limited thereto. That is, the description of the structure of the above-mentioned device and the shape of each part is an example, and it is obvious that various changes and additions can be made to these examples within the scope of the present invention.

[0137] The disclosure contents of the specification, drawings, and abstract contained in Japanese application No. 2023-002215 filed on January 11, 2023 are incorporated herein by reference in their entirety.

[0138] Industrial Applicability

[0139] The optical element driving device and camera module according to the present invention are useful when mounted on camera-mounted devices such as smartphones, mobile phones, digital cameras, notebook computers, tablet terminals, portable game consoles, vehicle-mounted cameras, and drones.

[0140] Explanation of symbols

[0141] 1—optical element driving device, 2—lens portion, 3—cover, 4—optical element driving device main body, 5—imaging portion, 10—holding portion, 11—opening portion, 12—frame portion, 13—outer peripheral surface, 14—groove portion, 15, 16A, 16B—recessed portion, 20—storage portion, 21—storage opening portion, 22—frame portion, 23—inner peripheral surface, 24—outer peripheral surface, 25, 26A, 26B—through portion, 27—bottom portion, 30—support portion, 31—shaft member, 40—driving portion, 41—magnet, 42—coil, 50—force applying portion, 51—yoke, 60A, 60B—adjustment portion, 61A, 61B—magnet, 62A, 62B—coil, 70—substrate portion, 71—substrate, 301

[0142] —opening part, 501—image sensor substrate, 502—photographing element, 503—control part.

Claims

1. An optical element driving device, It is characterized in that have: a holding portion capable of holding the optical element; a fixing portion that movably supports the holding portion via a supporting member; a driving unit having a first magnet disposed on one of the holding unit and the fixing unit and a first coil disposed on the other, and moving the holding unit; a yoke disposed on the other side so as to face the first magnet and biasing the holding portion toward the supporting member; as well as The adjusting portion includes a second magnet disposed on one of the holding portion and the fixing portion and a second coil disposed on the other, and adjusts a force for urging the holding portion toward the supporting member.

2. The optical element driving device according to claim 1, It is characterized in that The second magnet is disposed on the holding portion. The second coil is disposed on the fixing portion.

3. The optical element driving device according to claim 2, It is characterized in that The first magnet is disposed on the holding portion. The first coil and the second coil are arranged together on a substrate, and the substrate is arranged on the fixing portion.

4. The optical element driving device according to claim 1, It is characterized in that The supporting member is disposed on the fixing portion.

5. The optical element driving device according to claim 1, It is characterized in that The device further includes a control unit that controls energization of the first coil and the second coil. When the holding portion is moved, the control portion energizes the second coil, reduces the biasing force compared to before the energization, and then energizes the first coil.

6. A camera module, It is characterized in that have: The optical element driving device according to any one of claims 1 to 5; and The imaging unit uses the optical element to capture an image of a subject.

7. A camera-mounted device, which is information equipment or transportation equipment, characterized in that it comprises: The camera module of claim 6; and An image processing unit processes image information obtained by the camera module.

Images