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

Abstract

In an optical element driving device, a camera module, and a camera mounting device, an optical element driving device is provided with: a holding unit capable of holding an optical element; an accommodating part which has an opening part and accommodates the holding part in the opening part in a manner of surrounding the outer periphery of the holding part; a support part which supports the holding part in a manner that the holding part can move relative to the accommodating part along the optical path direction of the optical element; a driving unit that drives the holding unit; an urging part that urges the holding part toward the inside of the opening part; and two position sensors for acquiring the relative positions of the holding unit and the housing unit in the optical path direction, the two position sensors being disposed in the circumferential direction of the housing unit with the biasing unit therebetween.

Description

[0001] This application is a divisional application of the Chinese invention patent application with the application date of August 3, 2023, application number 202310971910.3, invention name “Optical element driving device, camera module and camera mounting device”, and the applicant being Mitsumi Electric Co., Ltd. Technical Field

[0002] 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

[0003] Generally speaking, a camera module is mounted in a camera-mounted device such as a smartphone or a drone. An optical element driving device that drives an optical element is used in such a camera module. It should be noted that a drone is an unmanned aircraft that can be flown by remote operation or automatic control, and there are also drones called "multi-rotor aircraft".

[0004] The optical element driving device has an automatic focusing function (hereinafter referred to as "AF function"). The optical element driving device moves the lens in the optical axis direction through the AF function to automatically focus when photographing a subject.

[0005] As such an optical element driving device, for example, Patent Document 1 discloses a lens driving device, which includes: an actuator having a piezoelectric element for driving a lens along an optical axis; and a substrate having a circuit for controlling an applied voltage to the piezoelectric element. In Patent Document 1, the substrate also includes a magnetic sensor for detecting the position of the lens.

[0006] Prior art literature

[0007] Patent Literature

[0008] Patent Document 1: Japanese Patent Application Publication No. 2020-13065 Summary of the invention

[0009] Problem that the invention aims to solve

[0010] As shown in Patent Document 1, an actuator having a piezoelectric element is used as a drive source for the lens in a lens driving device. There is research on using an ultrasonic motor that can obtain a large thrust as an actuator.

[0011] In order to drive the ultrasonic motor, a relatively large driving voltage is required, but in a small and thin camera-mounted device, the input voltage from the power supply is relatively small. Therefore, in a circuit for controlling the voltage applied to the piezoelectric element, an inductor is used to increase the input voltage and supply it to the ultrasonic motor.

[0012] In this way, the inductor can increase the input voltage, but since it has a coil, there is leakage flux from the coil. As described above, the lens driving device has a magnetic sensor for detecting the position of the lens, and therefore, the detection accuracy of the lens position may be reduced due to the influence of the leakage flux from the coil of the inductor. Therefore, a lens driving device that can prevent the reduction of the detection accuracy of the lens position is desired.

[0013] An object of the present invention is to provide an optical element driving device, a camera module, and a camera mounting device that can prevent a decrease in the accuracy of position detection of an optical element.

[0014] Solutions to the problem

[0015] An optical element driving device according to one embodiment of the present invention includes:

[0016] A holding portion capable of holding the optical element;

[0017] a housing portion having an opening portion, wherein the holding portion is accommodated in the opening portion in a manner of surrounding the outer periphery of the holding portion;

[0018] a supporting portion supporting the holding portion in a manner that the holding portion can move relative to the accommodating portion along an optical path direction of the optical element;

[0019] A driving part, driving the holding part;

[0020] a force applying portion for applying force to the holding portion toward the inner side of the opening; and

[0021] A position sensor is used to obtain the relative position of the holding portion and the accommodating portion in the direction of the optical path.

[0022] The position sensors are provided in two numbers, and the two position sensors are respectively arranged in a circumferential direction of the accommodation portion with the biasing portion interposed therebetween.

[0023] An optical element driving device according to one embodiment of the present invention includes:

[0024] A holding portion capable of holding the optical element;

[0025] an accommodating portion for accommodating the holding portion in a manner that the holding portion can move along the optical path direction of the optical element;

[0026] A driving part having a piezoelectric element for driving the holding part;

[0027] an inductor for increasing an input voltage to the piezoelectric element; and

[0028] A position sensor is used to detect the magnetic force of a magnet to obtain the relative position of the holding portion and the receiving portion in the direction of the optical path.

[0029] In a region obtained by dividing the holding portion and the housing portion into four equal parts around the optical axis, the driving portion and the position sensor are arranged in the same region, and the inductor is arranged in a region different from the same region.

[0030] The camera module of the present invention comprises:

[0031] The optical element driving device mentioned above; and

[0032] An imaging unit is configured to capture an image of an object using the optical element.

[0033] The camera-mounted device of the present invention is an information device or a transportation device, and comprises:

[0034] The camera module described above; and

[0035] An image processing unit processes image information obtained by the camera module.

[0036] Effects of the Invention

[0037] According to the present invention, it is possible to prevent a decrease in the accuracy of position detection of an optical element. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1A This is a front view showing a smartphone equipped with a camera module according to an embodiment of the present invention.

[0039] Figure 1B yes Figure 1A Rear view of the smartphone shown.

[0040] Figure 2 It is a perspective view showing a camera module and an imaging unit.

[0041] Figure 3 It is a top view of an optical element driving device main body included in the optical element driving device of the camera module.

[0042] Figure 4 Is the enlarged display Figure 3 A diagram of a first supporting portion of a main body of an optical element driving device is shown.

[0043] Figure 5 Is the enlarged display Figure 3 A diagram of a second supporting portion of the main body of the optical element driving device is shown.

[0044] Figure 6 Is the enlarged display Figure 3A diagram of a third supporting portion of the main body of the optical element driving device is shown.

[0045] Figure 7 Is the enlarged display Figure 3 A diagram of the driving portion of the optical element driving device main body is shown.

[0046] Figure 8 Observed from the side Figure 7 A diagram of the driving portion of the optical element driving device main body is shown.

[0047] Fig. 9 Yes means Figure 3 The illustrated diagram is a top view of a substrate portion of the main body of the optical element driving device, and is a diagram in which the substrate portion is developed into a flat surface.

[0048] Fig.10 Observed from the outside Figure 3 A diagram of the main body of the optical element driving device is shown.

[0049] Fig.11 Observed from the inside Figure 3 A diagram of a housing portion of an optical element driving device body is shown.

[0050] Fig.12 It means that Figure 3 The main body of the optical element driving device is shown in a top view divided into eight equal parts around the optical axis.

[0051] Fig.13A This is a front view showing a car as a camera mounting device on which the vehicle-mounted camera module is mounted.

[0052] Fig. 13B Observed from the rear side Fig.13A A perspective view of the car shown. DETAILED DESCRIPTION

[0053] Hereinafter, embodiments of the present invention will be described in detail based on the drawings.

[0054] [Smartphone]

[0055] Figure 1A and Figure 1B This is a diagram showing 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.

[0056] The smartphone M has a dual-lens camera consisting of two rear cameras OC1 and OC2. In the present embodiment, the camera module A is applied to the rear cameras OC1 and OC2.

[0057] The camera module A has an AF function, which can automatically focus when shooting a subject. It should be noted that 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 to capture an unblurred image.

[0058] [Camera module]

[0059] Figure 2 It is a perspective view showing the camera module A and the imaging unit 5 . Figure 3 yes Figure 2 The optical element driving device 1 of the camera module A shown in FIG. 1 is a top view of the optical element driving device body 4. Figure 2 and Figure 3 As 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).

[0060] When the camera module A is used to shoot with a smartphone M, for example, the X direction is the up-down direction (or the left-right direction), the Y direction is the left-right direction (or the up-down direction), and the Z direction is the front-back direction. 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 imaging side in the optical axis direction.

[0061] It should be noted that the optical axis OA is used for explanation below, but the optical axis direction of the optical axis OA can also be referred to as the optical path direction or the focus direction (the direction of adjusting the focus) according to the type of optical element. Here, the light path formed by the opening 301 of the cover 3 described later, the opening 11 of the holding part 10 described later, or the accommodation opening 21 of the accommodation part 20 described later is the optical path, and the extension direction of the optical path (the direction passing through each opening) is the optical path direction.

[0062] like Figure 2 and Figure 3 As shown, the camera module A includes an optical element driving device 1 for realizing an AF function, a lens unit 2 formed by accommodating a lens in a cylindrical lens barrel, and an imaging unit 5 for capturing an image of a subject formed by the lens unit 2. That is, the optical element driving device 1 is a so-called lens driving device for driving the lens unit 2 as an optical element.

[0063] Considering the mounting in the camera module A and the like, the optical element driving device 1 of the present embodiment has a structure in which the length in the Z direction is shorter than the lengths in the X and Y directions, and has a low-profile structure when the Z direction is regarded as the height direction.

[0064] [cover]

[0065] 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 in shape when viewed from the Z direction. In the present embodiment, the cover 3 is roughly square in shape when viewed from above. The cover 3 has a roughly circular opening 301 on the upper surface. The lens portion 2 is configured to be accommodated in the opening 11 of the retaining portion 10 of the optical element driving device body 4, face the outside from the opening 301 of the cover 3, and protrude toward the light receiving side more 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 accommodating portion 20 (bottom 22a) of the optical element driving device body 4 by, for example, bonding, to accommodate the optical element driving device body 4.

[0066] The cover 3 includes a member for blocking electromagnetic waves from the outside of the optical element driving device 1 or the inside of the cover 3 , for example, a shielding member made of a magnetic body.

[0067] [Camera Department]

[0068] 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 image of the object formed by the lens unit 2.

[0069] The control unit 503 is composed of, for example, a control IC, and performs overall drive 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 may also be provided on the image sensor substrate 501, or may also be provided on a camera-mounted device (in this embodiment, a smartphone M) that mounts the camera module A.

[0070] It should be noted that Figure 2In 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, so that the image of the object is formed on the image pickup element 502. However, for example, the image pickup element 502 may be driven in the Z direction. In this case, the lens unit 2 is fixed to the cover 3, and the image pickup element 502 as an optical element is driven in the Z direction by the optical element driving device 1, so that the image of the object is formed on the image pickup element 502.

[0071] [Optical element drive device main body]

[0072] The optical element driving device main 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. It should be noted that, hereinafter, for the sake of convenience, the optical element driving device 1 is described as driving the lens unit 2, but as described above, the optical element driving device 1 may also drive the imaging element 502.

[0073] like Figure 3 As shown, the optical element driving device body 4 has: a holding portion 10, a housing portion 20, a first supporting portion 30A, a second supporting portion 30B, a third supporting portion 30C, driving portions 40A, 40B (the first driving portion and the second driving portion in the present invention), and a substrate portion 50, etc.

[0074] [Maintenance Department]

[0075] The holding portion 10 has a frame portion 12 having an opening portion 11 formed in the center, and the opening portion 11 is configured to be able to hold the lens portion 2 inside. For example, the opening portion 11 is configured to be able to hold the lens portion 2 on the inner peripheral surface by forming a mounting groove or the like on the inner peripheral surface thereof. In this way, the holding portion 10 holds the lens portion 2 in a manner surrounding the outer periphery of the lens portion 2.

[0076] The outer peripheral side of the frame portion 12, that is, the outer peripheral surface 13, is movable in the Z direction at a plurality of locations (in Figure 3 The support structure 30A is supported by a first support portion 30A, a second support portion 30B, and a third support portion 30C extending in the Z direction (three locations as an example).

[0077] In addition, multiple locations of the outer peripheral surface 13 (in Figure 3 The holding portion 10 (two locations in the example) is held by the drive portions 40A and 40B, and the holding portion 10 can be moved in the Z direction due to the driving of the drive portions 40A and 40B.

[0078] In addition, in the outer peripheral surface 13, at a plurality of locations (in Figure 3Magnets 14A and 14B for detecting the position in the Z direction are provided at two locations (as an example). Position detection sensors 54A and 54B (position sensors in the present invention) described later are provided to face the magnets 14A and 14B, respectively.

[0079] It should be noted that 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 .

[0080] In addition, when the optical element driving device 1 drives the camera element 502, the opening portion 11 may not be provided in the holding portion 10, that is, the holding portion 10 may not be a frame portion. In this case, for example, the camera element 502 may be held on the upper surface (the surface on the light receiving side) of the holding portion 10.

[0081] [Accommodation]

[0082] The storage portion 20 includes a frame portion 22 having a storage opening 21 formed in the center thereof. 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 therein.

[0083] First, second, and third support portions 30A, 30B, and 30C are provided at multiple locations on the inner peripheral surface 23 of the storage opening 21. The storage portion 20 supports the holding portion 10 by the first, second, and third support portions 30A, 30B, and 30C so that the holding portion 10 can move in the Z direction.

[0084] In addition, driving parts 40A and 40B are provided at multiple locations on the inner peripheral surface 23. The driving parts 40A and 40B provided in the housing 20 move the holding part 10 in the Z direction. The holding part 10 functions as a movable part driven by the driving parts 40A and 40B, and the housing 20 functions as a fixed part for the holding part 10.

[0085] In a plan view, the inner peripheral surface 23 is formed in a manner corresponding to the shape of the outer peripheral surface 13 of the holding portion 10. Figure 3 , the shapes of the outer circumferential surface 13 of the holding portion 10 and the inner circumferential surface 23 of the accommodating opening 21 are examples and can be appropriately changed according to the configuration of the first support portion 30A, the second support portion 30B, the third support portion 30C, the drive portions 40A and 40B, etc.

[0086] The frame 22 has a bottom 22a and a side wall 22b. The inner wall of the cover 3 is fixed to the bottom 22a by, for example, bonding. The substrate 50 is attached to the outer peripheral surface 24 of the side wall 22b.

[0087] [Supporting part]

[0088] The first support portion 30A, the second support portion 30B, and the third support portion 30C are interposed between the outer peripheral surface 13 of the holding portion 10 and the inner peripheral surface 23 of the receiving portion 20, and support the holding portion 10 relative to the receiving portion 20 so that the holding portion 10 can move in the Z direction. Figure 3 As shown, the first support portion 30A, the second support portion 30B, and the third support portion 30C are respectively arranged at three locations dispersed in the circumferential direction on the inner peripheral surface 23 (outer peripheral surface 13).

[0089] For the first support portion 30A, the second support portion 30B and the third support portion 30C, refer to Figures 4 to 6 Provide explanation. Figure 4 Yes Figure 3 The illustrated diagram is an enlarged plan view of the first support portion 30A of the optical element driving device main body 4 . Figure 5 Yes Figure 3 The second support portion 30B of the optical element driving device main body 4 is shown in an enlarged plan view for explanation. Figure 6 Yes Figure 3 The third support portion 30C of the optical element driving device main body 4 is shown in an enlarged plan view for explanation.

[0090] [First support portion]

[0091] like Figure 3 As shown, the accommodating portion 20 has four corners 22bA, 22bB, 22bC, and 22bD. As described later, the first support portion 30A has a second rail member 32A that functions as a force-applying member, and a space for configuration is required. Therefore, the first support portion 30A is configured at the corner 22bA that is one of the four corners 22bA, 22bB, 22bC, and 22bD. By configuring in this way, space saving of the device can be achieved, miniaturization of the entire device can be achieved, and cost reduction can be achieved.

[0092] like Figure 4 As shown, the first support portion 30A has a first groove portion 15A, a recessed portion 26A, a first rail member 31A, and a second rail member 32A, and further has a rolling member 33 (eg, a ball member, etc.), and a race 34 .

[0093] The first groove 15A is a groove formed by a V-shaped depression extending in the Z direction on the outer peripheral surface 13 of the frame 12 of the holding portion 10. The recess 26A is a groove formed by a concave depression extending in the Z direction on the inner peripheral surface 23 of the frame 22 of the accommodating portion 20. The first groove 15A and the recess 26A are arranged to face each other. The recess 26A is formed to a size capable of accommodating the second rail member 32A functioning as a biasing member.

[0094] The first rail member 31A is a member having a V-shaped cross section extending in the longitudinal direction of the Z direction when mounted. The first rail member 31A has a V-shaped guide groove 31Aa on the side where the rolling member 33 is rollably arranged, and is mounted on the first groove portion 15A on the opposite side.

[0095] The second guide rail member 32A has a guide groove 32Aa that is V-shaped when viewed from above, and two arm portions 32Ab disposed at both ends of the guide groove 32Aa, and is a member that extends in the longitudinal direction of the Z direction when installed. The rolling member 33 is rollably disposed in the guide groove 32Aa. The two arm portions 32Ab are formed into a U-shape when viewed from above, and are disposed in a manner that the opening portions of the U-shape face each other. Such two arm portions 32Ab are installed in a manner that they are in contact with the inner wall of the recess 26A.

[0096] The second rail member 32A is formed of an elastically deformable material such as metal, functions as a leaf spring, and is supported by the inner wall of the recess 26A via two arm portions 32Ab so as to be elastically deformable.

[0097] Since the first rail member 31A is attached to the first groove portion 15A and the second rail member 32A is attached to the recessed portion 26A, the guide grooves 31Aa and 32Aa are arranged to face each other.

[0098] A plurality of (for example, two) rolling members 33 are accommodated and rollably sandwiched between the guide groove 31Aa of the first rail member 31A and the guide groove 32Aa of the second rail member 32A. The plurality of rolling members 33 roll along the guide groove 31Aa and the guide groove 32Aa to be guided in the Z direction.

[0099] The race 34 has holding holes corresponding to the number of rolling members 33. The plurality of rolling members 33 are held in the respective holding holes in a rollable manner and arranged in the Z direction. The race 34 keeps the distance between the plurality of rolling members 33 constant.

[0100] Therefore, the pressing force caused by the elastic deformation of the second rail member 32A functioning as the urging member presses the first rail member 31A and the first groove portion 15A via the rolling member 33 , thereby applying the pressing force to the holding portion 10 .

[0101] In this way, the first support portion 30A applies a pressing force toward the inside of the opening 11 to the holding portion 10 via the rolling member 33 using the second rail member 32A functioning as a biasing member. Therefore, the first support portion 30A supports the holding portion 10 so that the holding portion 10 can move in the Z direction while pressing the holding portion 10 toward the inside of the opening 11, thereby suppressing the tilt of the holding portion 10. As a result, the storage portion 20 can stably support the holding portion 10 by means of the first support portion 30A.

[0102] In this case, by forming the first rail member 31A from a harder metal material than the holder 10, the first groove 15A is less likely to deform even when pressed by the rolling member 33. With such a structure, the first support portion 30A can stably support the holder 10 so as to be movable in the Z direction.

[0103] [Second support portion]

[0104] The second support portion 30B is different from the first support portion 30A described above, and does not have a structure such as the second guide rail member 32A that functions as a force-applying member. Therefore, compared with the first support portion 30A, the second support portion 30B does not require a space for configuration. Therefore, the second support portion 30B avoids the four corners 22bA, 22bB, 22bC, and 22bD and can be configured on the side between the corner 22bD and the corner 22bB. In this way, the second support portion 30B can be configured to avoid the four corners 22bA, 22bB, 22bC, and 22bD, so that the drive units 40A and 40B can be configured at the corners 22bB and 22bC.

[0105] like Figure 5 As shown, the second support portion 30B has a first groove portion 15B, a second groove portion 26B, a first guide member 31B, and a second guide member 32B, and also has a rolling member 33 and a seat ring 34. The rolling member 33 and the seat ring 34 are the same structures as the rolling member 33 and the seat ring 34 described in the first support portion 30A, so the same reference numerals are given and repeated descriptions are omitted.

[0106] The first groove 15B is a groove formed by a concave depression extending in the Z direction on the outer peripheral surface 13 of the frame 12 of the holding portion 10. The second groove 26B is a groove formed by a V-shaped depression extending in the Z direction on the inner peripheral surface 23 of the frame 22 of the accommodating portion 20. The first groove 15B and the second groove 26B are arranged to face each other.

[0107] The first rail member 31B is a flat member extending in the longitudinal direction of the Z direction when installed. The first rail member 31B is installed at the bottom of the first groove portion 15B. The guide surface 31Ba of the first rail member 31B on the side where the rolling member 33 can be rollably arranged is flat and contacts the rolling member 33 at one point. Therefore, the position of the rolling member 33 in the groove of the first groove portion 15B is displaceable.

[0108] The second rail member 32B is a member having a V-shaped cross section extending in the longitudinal direction of the Z direction when mounted. The second rail member 32B has a V-shaped guide groove 32Ba on the side where the rolling member 33 is rollably arranged, and is mounted on the second groove portion 26B on the opposite side.

[0109] Since the first rail member 31B is attached to the first groove portion 15B and the second rail member 32B is attached to the second groove portion 26B, the guide surfaces 31Ba and the guide grooves 32Ba are arranged to face each other.

[0110] The plurality of rolling members 33 held by the race 34 are accommodated and rollably sandwiched between the guide surface 31Ba of the first rail member 31B and the guide groove 32Ba of the second rail member 32B. The plurality of rolling members 33 roll along the guide groove 32Ba and are guided in the Z direction.

[0111] As described above, the position of the rolling member 33 in the groove of the first groove portion 15B is displaceable, and therefore, in the circumferential direction of the outer peripheral surface 13 and the inner peripheral surface 23, relative displacement of the outer peripheral surface 13 and the inner peripheral surface 23 is allowed, that is, relative displacement of the holding portion 10 and the receiving portion 20. For example, with the position of the third support portion 30C described later as a reference (rotation center), the holding portion 10 can be relatively displaced in the rotation direction relative to the receiving portion 20.

[0112] As described above, the holding portion 10 is pressed by the first support portion 30A, so that in the second support portion 30B, the rolling member 33 and the first groove portion 15B (first guide member 31B) are relatively displaced in the circumferential direction as the pressing occurs. Due to this relative displacement, the contact position between the rolling member 33 and the first groove portion 15B (first guide member 31B) deviates, and with this deviation, when the forces acting on the engaging parts are stabilized, the support position of the holding portion 10 relative to the second support portion 30B is determined.

[0113] That is, when the forces acting on the first groove portion 15B (first rail member 31B), the rolling member 33, and the second groove portion 26B (second rail member 32B) as the mutually engaged portions are stable, the support position (engagement position) of the holding portion 10 relative to the second support portion 30B is determined. Thus, even if there are individual differences in the dimensions of the parts constituting the optical element driving device main body 4 or in the states after the parts are assembled, stable support without shaking can be achieved.

[0114] The second support portion 30B is formed of a metal material or the like that is harder than the holding portion 10 and the receiving portion 20, so that the first groove portion 15B and the second groove portion 26B are not easily deformed even when receiving a pressing force from the rolling member 33. With such a structure, the second support portion 30B can stably support the holding portion 10 in a manner that allows movement in the Z direction.

[0115] [Third support part]

[0116] The third support portion 30C is also different from the first support portion 30A described above, and does not have a structure such as the second rail member 32A that functions as a force-applying member. Therefore, compared with the first support portion 30A, the third support portion 30C does not require a space for arrangement. Therefore, the third support portion 30C avoids the four corners 22bA, 22bB, 22bC, and 22bD and can be arranged on the side between the corner 22bD and the corner 22bC. In this way, the third support portion 30C can be arranged avoiding the four corners 22bA, 22bB, 22bC, and 22bD, so that the driving parts 40A and 40B can be arranged at the corners 22bB and 22bC.

[0117] like Figure 6 As shown, the third support portion 30C has a first groove portion 15C, a second groove portion 26C, a first guide member 31C, and a second guide member 32C, and also has a rolling member 33 and a seat ring 34. The rolling member 33 and the seat ring 34 are the same structures as the rolling member 33 and the seat ring 34 described in the first support portion 30A, so the same reference numerals are given and repeated descriptions are omitted.

[0118] The first groove 15C is a groove formed by a V-shaped depression extending in the Z direction on the outer peripheral surface 13 of the frame 12 of the holding portion 10. The second groove 26C is a groove formed by a V-shaped depression extending in the Z direction on the inner peripheral surface 23 of the frame 22 of the accommodating portion 20. The first groove 15C and the second groove 26C are arranged to face each other.

[0119] The first rail member 31C is a member having a V-shaped cross section extending in the longitudinal direction of the Z direction when mounted. The first rail member 31C has a V-shaped guide groove 31Ca on the side where the rolling member 33 is arranged, and the opposite side is mounted to the first groove portion 15C.

[0120] The second rail member 32C is also a member having a V-shaped cross section extending in the longitudinal direction of the Z direction when installed. The second rail member 32C has a V-shaped guide groove 32Ca on the side where the rolling member 33 is arranged, and the side opposite to the V-shaped guide groove 32Ca is installed in the second groove portion 26C. The first rail member 31C is installed in the first groove portion 15C, and the second rail member 32C is installed in the second groove portion 26C, so that the respective guide grooves 31Ca and 32Ca are arranged to face each other.

[0121] The plurality of rolling members 33 held by the race 34 are accommodated and rollably sandwiched between the guide groove 31Ca of the first rail member 31C and the guide groove 32Ca of the second rail member 32C. The plurality of rolling members 33 roll along the guide groove 31Ca and the guide groove 32Ca and are guided in the Z direction.

[0122] In the third support portion 30C, the rolling member 33 is clamped by the first guide member 31C and the second guide member 32C having a V-shaped cross section. Therefore, the retaining portion 10 and the accommodating portion 20 mounted thereon are not allowed to be displaced in a direction perpendicular to the Z axis, but are allowed to be displaced in a rotational direction around the Z axis.

[0123] In this way, since the displacement of the holding portion 10 in the rotational direction around the Z axis is allowed, the third support portion 30C becomes a reference position (rotation center) for the displacement of the holding portion 10 relative to the housing portion 20, and the displacement of the holding portion 10 in the second support portion 30B is allowed. As a result, the second support portion 30B can absorb individual differences in the size of the parts constituting the optical element driving device main body 4 or individual differences in the state of these parts after assembly.

[0124] The third support portion 30C is formed of a metal material or the like that is harder than the holding portion 10 and the receiving portion 20, so that the first groove portion 15C and the second groove portion 26C are not easily deformed even when receiving a pressing force from the rolling member 33. With such a structure, the third support portion 30C can stably support the holding portion 10 in a manner that allows movement in the Z direction.

[0125] The holding portion 10 is stably supported by the first supporting portion 30A, the second supporting portion 30B, and the third supporting portion 30C configured as described above so as to be movable in the Z direction with respect to the housing portion 20 .

[0126] It should be noted that in the first support portion 30A, the second support portion 30B, and the third support portion 30C, opposing recesses extending along the Z direction that are recessed from the outer peripheral surface 13 and / or the inner peripheral surface 23 can also be provided in the portion of at least one of the outer peripheral surface 13 and the inner peripheral surface 23 that is opposite to the seat ring 34.

[0127] Lubricating oil is applied to the rolling member 33 held by the seat ring 34. When the lubricating oil is scattered from the rolling member 33 due to impact such as falling, the seat ring 34 may be attached to the outer peripheral surface 13 and the inner peripheral surface 23 due to the scattered lubricating oil. Considering such a possibility, the above-mentioned opposing recessed portions are provided so that the scattered lubricating oil is not easy to contact the seat ring 34, thereby preventing the seat ring 34 from sticking due to the lubricating oil.

[0128] [Drive unit]

[0129] The driving parts 40A and 40B drive the holding part 10 in the Z direction relative to the accommodation part 20. Figure 3 As shown, the driving parts 40A and 40B are respectively arranged at two locations dispersed in the circumferential direction on the inner peripheral surface 23 (outer peripheral surface 13). The optical element driving device body 4 can drive the lens unit 2 together with the holding unit 10 in the Z direction by using the first supporting part 30A, the second supporting part 30B, the third supporting part 30C and the driving parts 40A and 40B, thereby realizing the AF function.

[0130] exist Figure 3 In the example shown, the drive parts 40A and 40B are respectively arranged at corners 22bB and 22bC which are different from the corner 22bA where the first support part 30A is arranged and are point-symmetrical with respect to the optical axis OA in a plan view. By arranging in this way, even if the weight of the optical element such as the lens part 2 increases, the holding part 10 can be stably moved.

[0131] As the driving sections 40A, 40B, an actuator having a piezoelectric element such as an ultrasonic motor is used.

[0132] For the drive units 40A and 40B, refer to Figure 7 , Figure 8 Provide explanation. Figure 7 Yes Figure 3 The figure shows an enlarged view of the driving unit 40A of the optical element driving device main body 4. Figure 8 Observed from the side Figure 7 FIG. 4 is a diagram of a driving unit 40A of the optical element driving device main body 4. Figure 7 and Figure 8 The driving unit 40A is shown in the figure, and since the driving unit 40B has the same structure as the driving unit 40A, the detailed illustration and description of the driving unit 40B are omitted.

[0133] The driving unit 40A includes a piezoelectric element 41, a resonance unit 42, a power transmission unit 43, etc. The driving force generated in the resonance unit 42 by the vibration resonance of the piezoelectric element 41 is transmitted to the holding unit 10 via the power transmission unit 43. In the driving unit 40A, the resonance unit 42 constitutes an active element, and the power transmission unit 43 constitutes a passive element.

[0134] The piezoelectric element 41 is a plate-shaped element formed of, for example, a ceramic material, and generates vibrations by applying a high-frequency voltage. Two piezoelectric elements 41 are arranged so as to sandwich a body portion (reference numeral omitted) of the resonance portion 42. Although not shown in the figure, the connection wiring provided in the FPC 51 described later is electrically connected to the piezoelectric element 41, and a voltage is applied to the piezoelectric element 41.

[0135] The resonance part 42 is formed of a conductive material, and resonates with the vibration of the piezoelectric element 41 to convert the vibration motion into a linear motion. The resonance part 42 is formed by, for example, laser processing, etching processing, or press processing of a metal plate.

[0136] The resonance portion 42 includes: a roughly rectangular body clamped by the piezoelectric element 41, two arm portions 42a extending from both sides of the body in the Z direction, a protrusion 42b extending from the center of the body in the Z direction, and a current-carrying portion 42c extending from the center of the body to the side opposite to the protrusion 42b.

[0137] The body of the resonance part 42 is a portion sandwiched by the piezoelectric element 41. The two arm parts 42a have symmetrical shapes and deform symmetrically in resonance with the vibration of the piezoelectric element 41. The resonance part 42 is configured such that the two arm parts 42a extend in the Z direction and sandwich the power transmission part 43 at the free ends.

[0138] The protruding portion 42b is formed with a through hole for inserting a rivet or the like. The protruding portion 42b is fixed to the fixing portion 27 provided in the frame portion 22 of the accommodating portion 20 using a rivet or the like. The power supply portion 42c is a portion that constitutes a power supply line to the piezoelectric element 41 via the body portion of the resonance portion 42, and although not shown in the figure, it is electrically connected to a connection wiring provided on the FPC 51.

[0139] By means of the electrical connection as described above, a voltage is applied to the piezoelectric element 41 attached to the body of the resonance part 42 in the thickness direction, and vibration is generated. The resonance part 42 has at least two resonance frequencies, and deforms in different motions with respect to each resonance frequency. In other words, the overall shape of the resonance part 42 is set so that the resonance part 42 deforms in different motions with respect to the two resonance frequencies.

[0140] Here, the different actions are an action of advancing the power transmission unit 43 in the Z direction and an action of retreating the power transmission unit 43. Therefore, by vibrating the resonance unit 42 at a desired resonance frequency, the power transmission unit 43 can be advanced or retreated in the Z direction.

[0141] The power transmission part 43 is a clamping guide having a predetermined length in the Z direction. The power transmission part 43 is a member that applies force in a direction in which the two arm parts 42a of the resonance part 42 are expanded. The structure of the power transmission part 43 can be appropriately changed, but here, as an example, the power transmission part 43 is composed of a pair of leaf springs, and is embedded from the mounting part 16 embedded in the outer peripheral surface 13 of the frame part 12 of the holding part 10 to the outside.

[0142] In this way, the two arm portions 42a of the resonance part 42 abut against the power transmission part 43 in a manner that the power transmission part 43, which is a pair of leaf springs, is pressed inward. Moreover, the power transmission part 43 functions as a leaf spring, so when the two arm portions 42a abut, the driving force generated by the deformation of the resonance part 42 is efficiently transmitted, and the power transmission part 43 acts as a pressing force in the direction of pushing the arm portion 42a back. As a result, the driving force generated by the deformation of the resonance part 42 is more efficiently transmitted to the power transmission part 43, and the driving force of the drive part 40A is transmitted to the holding part 10.

[0143] Therefore, when a voltage is applied to the driving unit 40A, the piezoelectric element 41 vibrates and the resonance unit 42 deforms in accordance with the frequency. The driving force of the driving unit 40A causes the power transmission unit 43 to slide in the Z direction. Accordingly, the holding unit 10 moves in the Z direction, thereby performing focusing.

[0144] It should be noted that in the above-mentioned mounting portion 16, a protrusion 16a protruding outward from the outer peripheral surface 13 is provided between the pair of power transmission portions 43. Figure 7 As shown, the protrusion 16a extends along the power transmission part 43 in a plan view. The power transmission part 43 may move toward the protrusion 16a due to an impact such as falling, but by providing the protrusion 16a, the movement of the power transmission part 43 is restricted by contact with the protrusion 16a, and deformation of the power transmission part 43 can be prevented. As a result, the contact state between the arm part 42a and the power transmission part 43 can be maintained, and the driving force generated by the deformation of the resonance part 42 can be efficiently transmitted from the arm part 42a to the power transmission part 43.

[0145] [Substrate part]

[0146] and Figure 3 Also refer to Fig. 9 , Fig.10 The substrate portion 50 will be described. Fig. 9 Yes means Figure 3 The illustrated diagram is a top view of a substrate portion 50 of the optical element driving device main body 4 , and is a diagram in which the substrate portion 50 is developed into a flat surface. Fig.10 Observed from the outside Figure 3 The optical element driving device body 4 is shown in FIG. Figure 3 It should be noted that the drive units 40A and 40B are not mounted on the FPC 51 of the substrate unit 50, but are Fig. 9 In the figure, in order to facilitate understanding of the positional relationship, the drive units 40A and 40B are shown.

[0147] The substrate 50 has a circuit for driving the drive units 40A and 40B. The substrate 50 has an FPC (Flexible Printed Circuit) 51, a driver IC 52 (a control element in the present invention), inductors 53A and 53B, and position detection sensors 54A and 54B.

[0148] The FPC 51 is a flexible substrate, and is formed by laminating a relatively thin insulating layer such as a resin film and a metal layer such as a copper foil. Although not shown in the figure, the metal layer is formed as a circuit of a signal line and a power line, and electrically connects the drive units 40A, 40B, the driver IC 52, the inductors 53A, 53B, the position detection sensors 54A, 54B, etc.

[0149] The driver IC 52 is an IC that controls a drive signal for driving the drive units 40A and 40B. The driver IC 52 outputs a drive signal based on a detection signal detected by the position detection sensors 54A and 54B, for example, and the output drive signal is output to the drive units 40A and 40B via the inductors 53A and 53B.

[0150] The inductors 53A and 53B each have a coil, and step up the voltage (input voltage) of the drive signal input from the driver IC 52 and output the resultant voltage to the drive units 40A and 40B, respectively.

[0151] The position detection sensors 54A and 54B are, for example, magnetic sensors such as Hall elements.

[0152] The position detection sensors 54A and 54B detect the strength of the magnetic force generated by the magnets 14A and 14B disposed opposite to each other, thereby acquiring the relative position between the holding portion 10 and the receiving portion 20 in the Z direction, and outputting the relative position as a detection signal.

[0153] Although not shown in the figure, the FPC 51 is provided with connection wiring electrically connected to the drive units 40A and 40B.

[0154] In order to mount the driver IC 52 , inductors 53A, 53B, and position detection sensors 54A, 54B described above on the FPC 51 , the FPC 51 is formed as a long substrate. The FPC 51 is arranged along the outer peripheral surface 24 of the frame 22 of the housing 20 so as to substantially surround the outer peripheral surface 24 .

[0155] In order to arrange the FPC 51 along the outer peripheral surface 24, for example, the outer peripheral surface 24 of the corner 22bA is formed into an arc shape in a plan view. Thus, the FPC 51 can be arranged in close contact with the outer peripheral surface 24 of the corner 22bA. Therefore, it is not necessary to increase the size of the cover 3 arranged outside the FPC 51, and the overall miniaturization of the device can be achieved, which can achieve cost reduction.

[0156] In addition, the FPC 51 has an FPC main portion 51a, FPC narrow portions 51b, 51c, and FPC end portions 51d, 51e. The FPC main portion 51a connects the FPC narrow portion 51b and the FPC end portion 51d at one end side in the length direction with the FPC narrow portion 51c and the FPC end portion 51e at the other end side, and is equipped with a driver IC 52 and position detection sensors 54A, 54B.

[0157] The FPC narrowing portions 51b and 51c are respectively arranged between the FPC main portion 51a and the FPC end portion 51d, and between the FPC main portion 51a and the FPC end portion 51e, and are narrowed in a direction perpendicular to the longitudinal direction. Fig.10 As shown, the FPC narrow portions 51b and 51c are formed in a manner avoiding the portion of the housing 20 where the second support portion 30B and the third support portion 30C are arranged. By providing such FPC narrow portions 51b and 51c, it is not necessary to increase the size of the cover 3 arranged outside the FPC 51, and the overall device can be miniaturized, which can reduce costs.

[0158] Inductors 53A and 53B are installed at FPC ends 51d and 51e, which are both ends in the length direction of FPC 51. As described above, inductors 53A and 53B have coils, and there is leakage flux and noise radiation from the coils. Leakage flux and noise radiation may affect position detection sensors 54A and 54B, so in order to ensure the distance between position detection sensors 54A and 54B, inductors 53A and 53B are arranged at FPC ends 51d and 51e. On the other hand, for position detection, position detection sensors 54A and 54B are arranged at positions close to drive units 40A and 40B where driving force acts (becomes a force point).

[0159] Furthermore, in order to suppress leakage magnetic flux and noise, the optical element driving device main body 4 includes cover members 60A and 60B and a metal layer 55 .

[0160] The cover members 60A and 60B are formed of a metallic material that shields leakage magnetic flux and noise. The cover members 60A and 60B include a lid portion 61, a flange portion 63, an opening, and the like.

[0161] The cover 61 is a covered quadrangular cylindrical body having an opening. The flange 63 extends along the outer periphery of the opening of the cover 61. Specifically, the flange 63 extends along the surfaces of the FPC ends 51d, 51e at the outer periphery of the edge of the cover 61 as the outer periphery of the opening.

[0162] The cover members 60A and 60B are configured to accommodate the inductors 53A and 53B mounted on the FPC ends 51d and 51e in the opening of the lid 61 and cover the inductors 53A and 53B with the flange 63 disposed on the FPC ends 51d and 51e.

[0163] In this way, the cover members 60A and 60B include not only the cover portion 61 but also the flange portion 63. Therefore, the leakage magnetic flux and noise radiated from the inductors 53A and 53B to the cover members 60A and 60B can be shielded in a wider range by the cover portion 61 and the flange portion 63. As a result, the magnetic flux and noise leaking to the outside can be reduced compared to the cover member without the flange portion.

[0164] The flange portion 63 may be fixed to the surface of the FPC end portions 51d, 51e, for example, by using an adhesive, etc. Compared to a case where there is no flange portion, the contact area between the flange portion 63 and the surface of the FPC end portions 51d, 51e becomes wider, so that the cover components 60A, 60B can be reliably fixed to the surface of the FPC end portions 51d, 51e.

[0165] At the FPC end 51d, the metal layer 55 is arranged to face the inductor 53A mounted on the FPC end 51d. The metal layer 55 is provided, for example, on the surface of the FPC end 51d opposite to the surface on which the inductor 53A is mounted. The metal layer 55 is formed of a solid pattern that includes at least the region where the inductor 53A is arranged when viewed from above.

[0166] In this way, since the metal layer 55 is provided at the FPC end portion 51d where the inductor 53A is mounted, the leakage magnetic flux and noise radiated from the inductor 53A to the FPC end portion 51d side can be shielded by the metal layer 55. As a result, compared with an FPC without the above-mentioned metal layer 55, the magnetic flux and noise leaking to the outside through the FPC 51 can be reduced.

[0167] Furthermore, preferably Fig. 9As shown in the figure, the metal layer 55 is formed so as to overlap with the flange portion 63. As a result, it is possible to reduce the gap between the flange portion 63 and the metal layer 55. This is particularly effective when using an FPC as a substrate.

[0168] In this way, since the gap between the flange portion 63 and the metal layer 55 is reduced, the cover member 60A and the metal layer 55 can cover substantially the entire periphery of the inductor 53A. Thus, the leakage magnetic flux and noise radiated from the inductor 53A can be shielded by the cover member 60A and the metal layer 55. As a result, the magnetic flux and noise leaking to the outside can be further reduced.

[0169] The cover parts 60A and 60B are made of a metal material that reduces magnetic flux leakage and noise. For example, the cover parts 60A and 60B use a laminated structure in which at least a layer made of copper and nickel is laminated on a layer made of iron such as SPCC (Steel Plate Cold Commercial; cold-rolled steel plate), which is a strong magnetic material. In this laminated structure, the iron layer, the copper layer, and the nickel layer are laminated in this order, thereby preventing the iron layer from rusting.

[0170] The copper layer is stacked for the purpose of offsetting the effect of the iron layer causing the inductance to increase. By making the copper layer thicker than the nickel layer, the shielding property against noise can also be improved. Thus, in the stacked structure of at least the iron layer, the copper layer and the nickel layer stacked as the cover parts 60A and 60B, it is more preferable to make the copper layer thicker than the nickel layer.

[0171] In addition, the metal layer 55 may be used as a power supply layer or a ground layer for supplying power in the circuit of the FPC 51. In addition, the metal layer 55 is not limited to a single layer, and may be composed of a plurality of layers stacked with an insulating layer interposed therebetween. For example, in the case of being composed of two layers stacked with an insulating layer interposed therebetween, one layer may be set as the power supply layer described above, and the other layer may be set as the ground layer.

[0172] When the power supply layer or the ground layer of the circuit of the FPC 51 is not used as the metal layer 55 , the metal layer 55 may be formed by laminating a plurality of metal layers, similarly to the cover members 60A and 60B.

[0173] Here, Fig.11 Observed from the inside Figure 3 FIG. 2 is a diagram of the housing portion 20 of the main body 4 of the optical element driving device, and is a diagram showing the state in which the lens portion 2 and the holding portion 10 are removed. Figure 3 The figure is viewed from direction D2.

[0174] In order to realize the miniaturization of the device, the housing portion 20 has insertion portions 25A and 25B into which the cover members 60A and 60B of the above-mentioned structure are inserted. Fig.11As shown, the insertion portions 25A and 25B are provided by penetrating the side wall portion 22b of the frame portion 22. However, as long as the cover members 60A and 60B can be inserted, a structure such as a recessed portion that does not penetrate the side wall portion 22b may be used.

[0175] By inserting the cover members 60A and 60B into such insertion portions 25A and 25B, the entire device can be miniaturized and the cost can be reduced.

[0176] In addition, Fig.11 In the case of the structure shown, for example, if the housing portion 20 and the FPC end portion 51d are fixed by adhesive or the like, the flange portion 63 is fixed between the housing portion 20 and the FPC 51, and therefore, the flange portion 63 does not need to be fixed to the surface of the FPC end portions 51d and 51e. This can simplify the manufacturing process of the optical element driving device main body 4.

[0177] Furthermore, when the cover members 60A and 60B are inserted so as to fit the insertion portions 25A and 25B, the cover members 60A and 60B also have a reinforcing function for the accommodation portion 20 having the insertion portions 25A and 25B, and deformation of the accommodation portion 20 can be suppressed.

[0178] [Configuration inside the main body of the optical element driving device]

[0179] Reference Figure 3 , Fig.12 The arrangement of the inductors 53A and 53B, the position detection sensors 54A and 54B, and the like in the optical element driving device main body 4 will be described. Fig.12 It means that Figure 3 The optical element driving device main body 4 is shown in a plan view when it is divided into eight equal parts around the optical axis.

[0180] As described above, the inductors 53A and 53B have leakage magnetic flux from their coils, and as described above, the optical element driving device main body 4 has the position detection sensors 54A and 54B using magnetic sensors. Therefore, the position detection sensors 54A and 54B may be affected by the leakage magnetic flux from the coils of the inductors 53A and 53B, and the detection accuracy of the position of the holding portion 10 may be reduced.

[0181] Therefore, in this embodiment, in order to ensure that the distance between the inductors 53A, 53B and the position detection sensors 54A, 54B is a predetermined amount, the following configuration is used. Specifically, the inductors 53A, 53B and the position detection sensors 54A, 54B are respectively arranged in different regions of the regions R1 to R4 divided into four equal parts around the optical axis OA. Figure 3In the illustrated example, the inductors 53A and 53B are arranged in the region R1 , the position detection sensor 54A is arranged in the region R2 , and the position detection sensor 54B is arranged in the region R4 .

[0182] Furthermore, refer to Fig.12 In order to explain, the inductors 53A and 53B and the position detection sensors 54A and 54B are respectively arranged in different regions separated by at least one region among the regions R1-1 to R4-2 divided into eight equal parts around the optical axis OA. Fig.12 In the example shown, the inductor 53A is arranged in the region R1-2, the inductor 53B is arranged in the region R1-1, the position detection sensor 54A is arranged in the region R2-2, and the position detection sensor 54B is arranged in the region R4-1. The inductor 53A and the position detection sensor 54A are arranged in the region R1-2 and the region R2-2, respectively, with the region R2-1 interposed therebetween, and the inductor 53B and the position detection sensor 54B are arranged in the region R1-1 and the region R4-1, respectively, with the region R4-2 interposed therebetween.

[0183] In addition, if Figure 3 and Fig.12 As shown in FIG. 1 , the housing portion 20 is rectangular in a plan view, and the inductors 53A and 53B and the position detection sensors 54A and 54B are arranged on different sides of the housing portion 20. Figure 3 , Fig.12 In the example shown, the inductor 53A is arranged at the side between the corner 22bD and the corner 22bB, and the inductor 53B is arranged at the side between the corner 22bD and the corner 22bC. Furthermore, the position detection sensor 54A is arranged at the side between the corner 22bB and the corner 22bA, and the position detection sensor 54B is arranged at the side between the corner 22bC and the corner 22bA.

[0184] It should be noted that, here, the inductor 53A, the second support portion 30B, the drive portion 40A, and the position detection sensor 54A are arranged in this order clockwise along the side of the accommodating portion 20, but the order of the second support portion 30B and the drive portion 40A may be reversed. Similarly, the inductor 53B, the third support portion 30C, the drive portion 40B, and the position detection sensor 54B may be arranged in this order counterclockwise along the side of the accommodating portion 20, but the order of the third support portion 30C and the drive portion 40B may be reversed.

[0185] In this way, by arranging the inductors 53A, 53B and the position detection sensors 54A, 54B in different regions or on different sides, the distance between the inductors 53A, 53B and the position detection sensors 54A, 54B can be ensured to be a predetermined amount. Thus, the influence of the leakage magnetic flux from the coils of the inductors 53A, 53B can be suppressed, and as a result, the reduction in the position detection accuracy of the position detection sensors 54A, 54B can be prevented.

[0186] exist Figure 3 In the structure shown, the drive unit 40A and the drive unit 40B are respectively arranged in diagonal areas of the areas R1 to R4 divided into four equal parts. Figure 3 In the illustrated example, the drive unit 40A is arranged in the region R2 , and the drive unit 40B is arranged in the region R4 which is diagonal to the region R2 .

[0187] Furthermore, the driving units 40A and 40B for driving the holding unit 10 and the position detection sensors 54A and 54B for detecting the position of the holding unit 10 are arranged close to each other. Figure 3 In the example shown, since the drive unit 40A is arranged in the region R2, the position detection sensor 54A is arranged in the region R2, and the drive unit 40A and the position detection sensor 54A are arranged in the same region R2. In addition, since the drive unit 40B is arranged in the region R4, the position detection sensor 54B is arranged in the region R4, and the drive unit 40B and the position detection sensor 54B are arranged in the same region R4.

[0188] In this way, since the position detection sensors 54A and 54B are provided close to the drive units 40A and 40B that drive the holding unit 10 , the position detection accuracy of the holding unit 10 driven by the drive units 40A and 40B can be improved.

[0189] In addition, the inductors 53A and 53B have noise caused by leakage magnetic flux of their coils, and as described above, the optical element driving device main body 4 has the driver IC 52 for controlling the drive signal for driving the drive units 40A and 40B. The driver IC 52 may be affected by the noise caused by leakage magnetic flux of the coils of the inductors 53A and 53B.

[0190] Therefore, in order to ensure that the distance between the inductors 53A, 53B and the driver IC 52 is also a predetermined amount, the inductors 53A, 53B and the driver IC 52 are respectively arranged in different regions of the regions R1 to R4 divided into four equal parts around the optical axis OA. Figure 3 In the illustrated example, the inductors 53A and 53B are arranged in the region R1 , and the driver IC 52 is arranged in the regions R3 and R4 .

[0191] In this way, by arranging the inductors 53A and 53B and the driver IC 52 in different regions, the distance between the inductors 53A and 53B and the driver IC 52 can be kept at a predetermined distance. Thus, the influence of noise caused by the leakage magnetic flux from the coils of the inductors 53A and 53B can be suppressed, and as a result, the influence on the drive signal output from the driver IC 52 can be prevented.

[0192] [Other embodiments]

[0193] The present invention is not limited to the above-described embodiments, and may be modified within the scope of the present invention.

[0194] For example, in the above embodiment, two position detection sensors 54A and 54B are provided, but the position detection sensor may be one. In this case, it is preferable to provide the position detection sensor near the third support portion 30C, which is the reference (rotation center) of the holding portion 10 that can be relatively displaced with respect to the accommodating portion 20. Figure 3 In the example of FIG. 5 , the position detection sensor 54B corresponds to a position detection sensor in the vicinity of the third support portion 30C.

[0195] In addition, in the above-mentioned embodiment, the first guide rail members 31A to 31C and the second guide rail members 32A to 32C are provided in the first grooves 15A to 15C, the recessed portions 26A, and the second grooves 26B and 26C, but these members may not be provided. In this case, the rolling member 33 may be directly clamped by the first grooves 15A to 15C, the recessed portions 26A, and the second grooves 26B and 26C.

[0196] In addition, in the above-mentioned embodiment, the angles between the first support portion 30A, the second support portion 30B, and the third support portion 30C are preferably arranged at intervals of 120°, but the angles may be appropriately changed. When the first support portion 30A, the second support portion 30B, and the third support portion 30C are arranged at angles other than 120°, it is preferable to set the following structure and arrangement.

[0197] For example, in a plan view, the pressing direction of the second rail member 32A as the biasing member of the first support portion 30A on the rolling member 33 is set to the direction toward the optical axis OA, and the second support portion 30B and the third support portion 30C are arranged in a line-symmetrical position with respect to this direction. By setting such a structure and arrangement, the pressing force received from the first support portion 30A side in the second support portion 30B and the third support portion 30C is equal, and the holding portion 10 can be stably supported.

[0198] In addition, the support parts may be dispersedly arranged at more than three locations in the circumferential direction of the inner peripheral surface 23 (outer peripheral surface 13). In this case, the support parts are preferably arranged at locations that are multiples of three, such as 6 locations, 9 locations, etc., in order to further support the object between the three-point supports on the basis of the three-point supports that can stably support the object.

[0199] In addition, in the above-mentioned embodiment, a 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, and the image processing unit processes the image information obtained by the camera module. The camera-mounted device includes information equipment and transportation equipment. Information equipment includes, for example, a portable phone with a camera, a laptop computer, a tablet terminal, a portable game console, a web camera, and a vehicle-mounted device with a camera (for example, a rear monitoring device, a driving recorder device). In addition, transportation equipment includes, for example, a car and a drone.

[0200] Fig.13A , Fig. 13B 1 is a diagram showing a car V as a camera mounting device on which a vehicle-mounted camera module VC (Vehicle Camera) is mounted. Fig.13A This is the front view of the car V. Fig. 13B 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.13A and Fig. 13B As shown, the vehicle-mounted camera module VC is mounted on a windshield facing forward, or mounted on a tailgate facing backward. The vehicle-mounted camera module VC is used as a vehicle-mounted camera module for rear monitoring, driving recorder, collision avoidance control, automatic driving control, etc.

[0201] In the above embodiment, the optical element driving device 1 is described as driving the lens unit 2 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 shape of the opening 11 of the holding portion 10 may be changed according to the shape of the optical element to be mounted, or the opening may not be provided depending on the situation.

[0202] Furthermore, in the above-described embodiment, the optical element driving device 1 has an AF function, but not only the AF function but also a function of moving the lens unit 2 in the Z direction, such as a zoom function, may be provided.

[0203] The above is a description of the embodiments of the present invention. It should be noted that 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. In other words, the description of the structure of the above device and the shape of each part is an example, and of course, various changes or additions can be made to these examples within the scope of the present invention.

[0204] Industrial Applicability

[0205] The optical element driving device and camera module of the present invention are useful when mounted on, for example, smartphones, mobile phones, digital cameras, notebook computers, tablet terminals, portable game consoles, and camera-mounted devices such as vehicle-mounted cameras and drones.

[0206] Description of Reference Numerals

[0207] 1 Optical element drive device

[0208] 2 Lens section

[0209] 3 Hood

[0210] 4 Optical element drive unit body

[0211] 5. Camera Department

[0212] 10. Holding unit

[0213] 11 Opening

[0214] 12 Frame

[0215] 13 Outer Surface

[0216] 14A, 14B magnet

[0217] 15A, 15B, 15C first groove portion

[0218] 16 Installation

[0219] 20 Accommodation

[0220] 21 Accommodation opening

[0221] 22 Frame

[0222] 22a Bottom

[0223] 22b Side wall

[0224] 22bA, 22bB, 22bC, 22bD corners

[0225] 23 Inner Surface

[0226] 24 Outer Surface

[0227] 25A, 25B Insertion part

[0228] 26A recess

[0229] 26B, 26C Second groove portion

[0230] 27 Fixed part

[0231] 30A First support part

[0232] 30B Second support part

[0233] 30C Third support part

[0234] 31A~31C First guide rail component

[0235] 32A~32C Second guide rail component

[0236] 33 Rolling parts

[0237] 34 Seat

[0238] 34a Retaining hole

[0239] 40A, 40B drive unit

[0240] 50Substrate Department

[0241] 51FPC

[0242] 51a FPC main part

[0243] 51b, 51c FPC narrow part

[0244] 51d, 51e FPC end

[0245] 52 Driver IC

[0246] 53A, 53B Inductors

[0247] 54A, 54B position detection sensor

[0248] 55 metal layers

[0249] 60A, 60B cover parts

[0250] 61 cover

[0251] 63 Flange

[0252] 301 Opening

[0253] 501 Image sensor substrate

[0254] 502 Camera Components

[0255] 503 Control Department

Claims

1. An optical element driving device, characterized in that: have: A holding portion capable of holding the optical element; a housing portion having an opening portion, wherein the holding portion is accommodated in the opening portion in a manner of surrounding the outer periphery of the holding portion; a supporting portion supporting the holding portion in a manner that the holding portion can move relative to the accommodating portion along an optical path direction of the optical element; A driving part, driving the holding part; a force applying portion, applying force to the holding portion toward the inner side of the opening; as well as A position sensor is used to obtain the relative position of the holding portion and the accommodating portion in the direction of the optical path. The position sensors are provided in two numbers, and the two position sensors are respectively arranged in a circumferential direction of the accommodation portion with the biasing portion interposed therebetween.

2. The optical element driving device according to claim 1, wherein: The receiving portion is rectangular in shape when viewed from above. The force applying portion is disposed at a corner of the accommodation portion, The two position sensors are respectively arranged on sides sandwiching the corner portion.

3. A camera module, characterized in that: have: The optical element driving device according to claim 1 or 2; and An imaging unit is configured to capture an image of an object using the optical element.

4. A camera-mounted device, which is information equipment or transportation equipment, wherein the camera-mounted device is characterized in that it has: The camera module of claim 3; and An image processing unit processes image information obtained by the camera module.

Images