Position control device, shake correction device, and optical device

Abstract

To provide a position control device, a shake correction device, and an optical device which improve linearity characteristics and which can obtain large drive force.SOLUTION: A shake correction device 10 uses a double magnet structure including: a yoke 16 having a first magnet 30 and a second magnet 32; a yoke 18 having a third magnet 34 and a fourth magnet 36; and a moving part 12 holding an FPC substrate 28 to which a coil C1 and a hall element h1 are attached. The hall element h1 is arranged at the inside of the coil C1, and has a surface 42 of mounting itself at a position B between a first end surface 38 and a second end surface 40 which face each other in a height direction as an A direction of the coil C1.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a position control device, a blur correction device, and an optical device for performing image blur correction. [Background technology]

[0002] Patent Document 1 discloses a stage device including a fixed section, a movable section movable relative to the fixed section, a driving force generating section, and a magnetic field detecting means. The driving force generating section includes a first magnet section composed of a first magnet and a second magnet, a second magnet section composed of a third magnet and a fourth magnet, and a coil disposed between the first magnet section and the second magnet section, and the magnetic field detecting means is disposed between the first magnet section and the second magnet section. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2020-197630 Summary of the Invention

[0004] One embodiment of the technique of the present disclosure provides a position control device, a blur correction device, and an optical device that correct image blur by moving a moving unit that has a holding member that holds an imaging element or an optical element. [Means for solving the problem]

[0005] A position control device according to a first aspect of the present invention comprises a fixed part having a first yoke, a first magnet and a second magnet attached to the first yoke and arranged with a first width, a second yoke arranged opposite the first yoke, and a third magnet and a fourth magnet attached to the second yoke and arranged with a second width, and a movable part arranged between the first yoke and the second yoke and having a substrate on which a coil and a position detection sensor are attached, wherein the position detection sensor is arranged inside the coil and has an attachment surface for the position detection sensor at a position between a first end face and a second end face that face each other in the height direction of the coil.

[0006] A position control device according to a second aspect of the present invention is the first aspect, wherein the position detection sensor is attached to a height adjustment section whose height from the substrate is adjusted.

[0007] The position control device according to a third aspect of the present invention is the second aspect, further comprising a support member that supports the height adjustment unit.

[0008] A fourth aspect of the present invention provides the position control device of the third aspect, wherein the support member is a coil bobbin of a coil.

[0009] A position control device according to a fifth aspect of the present invention is a device according to the first aspect, in which the coil has a first coil arranged on a first surface and a second coil arranged on a second surface, of which the first surface and the second surface face each other in the thickness direction of the substrate, and the position detection sensor is attached to the first surface or the second surface.

[0010] A position control device according to a sixth aspect of the present invention is the fifth aspect, and further includes an electronic circuit that outputs a first control signal and a second control signal, which are out of phase with each other at a predetermined frequency, to the first coil and the second coil.

[0011] A position control device according to a seventh aspect of the present invention is characterized in that, in the seventh aspect, the first control signal and the second control signal are PWM control signals.

[0012] A position control device according to an eighth aspect of the present invention is an aspect according to any one of the fifth to seventh aspects, in which when the position detection sensor is attached to the first surface, the inner diameter of the second coil is smaller than the inner diameter of the first coil.

[0013] A position control device according to a ninth aspect of the present invention is the position control device according to any one of the first to eighth aspects, wherein the first width and the second width are different from each other.

[0014] A vibration reduction device according to a tenth aspect of the present invention is a vibration reduction device in which the position control device according to any one of the first to ninth aspects is a vibration reduction device, the moving part includes a holding member, and the holding member holds an imaging element or an optical element.

[0015] An optical device according to an eleventh aspect of the present invention includes the image stabilization device of the tenth aspect. [Brief explanation of the drawings]

[0016] [Figure 1] FIG. 1 is a front view of the image stabilization device of this embodiment, as viewed from the front side. [Figure 2] FIG. 2 is a functional block diagram of the image stabilization device of FIG. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. [Figure 4] FIG. 4 is an explanatory diagram showing a substrate configuration in which the Hall element is elevated. [Figure 5] FIG. 5 is an explanatory diagram showing a VCM with a single-sided configuration. [Figure 6] FIG. 6 is an explanatory diagram showing a VCM with a double magnet configuration. [Figure 7] FIG. 7 is an explanatory diagram in which a tall coil is used instead of the coil in FIG. [Figure 8] FIG. 8 is an explanatory diagram showing another example of the raised structure of the Hall element. [Figure 9] FIG. 9 is an explanatory diagram showing another example of the raised structure of the Hall element. [Figure 10]FIG. 10 is an explanatory diagram showing another example of the raised structure of the Hall element. [Figure 11] FIG. 11 is an explanatory diagram showing another example of the raised structure of the Hall element. [Figure 12] FIG. 12 is an explanatory diagram showing a Hall element attached using a coil bobbin. [Figure 13] FIG. 13 is a diagram showing a first modified example of the image stabilization device. [Figure 14] FIG. 14 is a diagram showing a second modified example of the image stabilization device. [Figure 15] FIG. 15 is a graph showing the relationship between the double magnet configuration and the linearity characteristics. DETAILED DESCRIPTION OF THE INVENTION

[0017] Hereinafter, an embodiment of the present invention will be described with reference to the drawings.

[0018] FIG. 1 is an explanatory diagram showing the schematic configuration of a blur correction device 10 of this embodiment, as seen from the front side (subject side). Blur correction device 10 is mounted on a digital camera and corrects image blur caused by vibrations occurring in the digital camera. Blur correction device 10 is an example of a position control device and blur correction device of the present invention.

[0019] To briefly explain a digital camera (hereinafter simply referred to as "camera"), the camera comprises a camera body and a lens unit provided in the camera body. The image stabilization device 10 of this embodiment is mounted in the camera body. The camera may be an interchangeable lens camera in which the lens unit is detachable from the camera body, or may be an integrated lens camera. The camera is an example of the optical device of the present invention.

[0020] 1, the image stabilization device 10 includes a moving section 12 and a fixed section 14 that movably supports the moving section 12. The moving section 12 and the fixed section 14 are examples of the moving section and the fixed section of the present invention.

[0021] The moving section 12 includes a holding member 13 that holds the imaging element 20. The holding member 13 is an example of the holding member of the present invention. The fixed section 14 includes a yoke 16 and a yoke 18 (see FIG. 3). The yoke 16 and the yoke 18 are examples of the first yoke and the second yoke of the present invention, respectively.

[0022] The imaging element 20 captures an image of a subject through an imaging optical system provided in a lens unit. The imaging element 20 has a semiconductor chip on which a CMOS (Complementary Metal Oxide Semiconductor) image sensor or a CCD (Charge Coupled Device) image sensor or the like is formed, and a package that houses the semiconductor chip. The imaging element 20 is an example of an imaging element of the present invention.

[0023] The fixed section 14 is fixed to the camera body. The fixed section 14 supports the moving section 12 so that it can move within a plane that intersects with the optical axis of the image sensor 20. In this embodiment, the moving section 12 is supported so that it can move within a plane that is perpendicular to the optical axis of the image sensor 20. Note that the above perpendicular includes a range that is recognized as being substantially perpendicular.

[0024] The image stabilization device 10 corrects image blur in an image captured by the image sensor 20 by moving the light receiving surface of the image sensor 20 within a plane perpendicular to the optical axis of the image sensor 20. The optical axis of the image sensor 20 is a virtual straight line that passes through the center of the light receiving surface of the image sensor 20 and is perpendicular to the light receiving surface.

[0025] The image blur correction device 10 corrects image blur by moving the movable part 12 relative to the fixed part 14 in three directions: the X direction, which is the short-side direction of the light-receiving surface of the image sensor 20; the Y direction, which is the long-side direction of the light-receiving surface; and the θ direction, which is the direction around the optical axis (the direction of rotation around the optical axis).

[0026] FIG. 2 is a functional block diagram showing a schematic configuration of the image stabilization device 10 shown in FIG.

[0027] As shown in FIG. 2, the image stabilization device 10 includes a moving unit 12 that is movable in three directions, namely, the X, Y, and θ directions, and a fixed unit 14 that supports the moving unit 12 so that it can move freely in the above three directions.

[0028] The moving unit 12 has a circuit board 22 on which the imaging element 20 is attached, a coil C1 for X-axis and rotational drive, a coil C2 for X-axis and rotational drive, and a coil C3 for Y-axis drive. The coils C1, C2, and C3 are examples of the coils of the present invention.

[0029] The moving unit 12 also has Hall elements h1, h2, and h3. The Hall elements h1, h2, and h3 are examples of position detection sensors of the present invention. Output signals from the Hall elements h1, h2, and h3 are input to a system control unit 24 of the camera. The system control unit 24 has a driver 26. The driver 26 is an example of an electronic circuit.

[0030] Based on the output signals from the Hall elements h1, h2, and h3, the system control unit 24 controls the PWM (Pulse Width Modulation) control signals output from the driver 26 to the coils C1, C2, and C3, respectively. As a result, the moving unit 12 moves in a direction that corrects the image blur, and the image blur is corrected.

[0031] These coils C1, C2, C3 and Hall elements h1, h2, h3 are attached to a flexible substrate (FPC (Flexible Printed Circuits) substrate) 28. The FPC substrate 28 is attached to the holding member 13 of the moving part 12. The FPC substrate 28 is an example of a substrate of the present invention.

[0032] The fixed section 14 has two yokes 16 and 18. In the image stabilization device 10, the yoke 16 is disposed on the rear side (photographer side), and the yoke 18 is disposed on the front side (subject side). The yokes 16 and 18 are disposed opposite each other with the moving section 12 sandwiched between them in a direction parallel to the optical axis direction of the image sensor 20. With the moving section 12 sandwiched between the yokes 16 and 18, the yokes 16 and 18 are fixed to each other by screwing them together with a plurality of screws. Note that the above-mentioned "parallel" includes a range that is considered to be substantially parallel. The yoke 18 is not shown in FIG. 1.

[0033] As shown in FIG. 2, the yoke 16 has a magnet group Mv1 for X-axis and rotational driving, a magnet group Mv2 for X-axis and rotational driving, and a magnet group Mv3 for Y-axis driving.

[0034] The yoke 18 has a magnet group Mv4 for X-axis and rotational drive, a magnet group Mv5 for X-axis and rotational drive, and a magnet group Mv6 for Y-axis drive.

[0035] The three magnet groups Mv1, Mv2, and Mv3, and the three magnet groups Mv4, Mv5, and Mv6 are arranged facing each other in a direction parallel to the optical axis of the image sensor 20. Note that the above-mentioned "parallel" includes a range that is recognized as being substantially parallel.

[0036] 3 is a cross-sectional view taken along line III-III in FIG. 1, illustrating the arrangement of the two magnet groups Mv1 and Mv4, the coil C1, and the Hall element h1 (the former arrangement). The two magnet groups Mv1 and Mv4, the coil C1, and the Hall element h1 are arranged along direction A, which is parallel to the optical axis direction of the image sensor 20. The term "parallel" as used above includes a range that is considered to be substantially parallel.

[0037] Note that the arrangement of the two magnet groups Mv2, Mv5, coil C2, and Hall element h2 (the latter arrangement), and the arrangement of the two magnet groups Mv3, Mv6, coil C3, and Hall element h3 (the latter arrangement) are similar to the former arrangements, so here we will explain the former arrangement and omit the explanation of the two latter arrangements.

[0038] As shown in FIG. 3, the image stabilization device 10 of this embodiment includes a moving section 12 and a fixed section 14.

[0039] The fixed portion 14 has a yoke 16, a first magnet 30 and a second magnet 32 ​​provided on the yoke 16 and arranged with a first width w1, a yoke 18 arranged opposite the yoke 16, and a third magnet 34 and a fourth magnet 36 provided on the yoke 18 and arranged with a second width w2.

[0040] The moving part 12 is disposed between the yoke 16 and the yoke 18 and has an FPC board 28 on which a coil C1 and a Hall element h1 are attached.

[0041] The first magnet 30 and the second magnet 32 ​​are examples of the first magnet and the second magnet of the present invention, and the first magnet 30 and the second magnet 32 ​​form a magnet group Mv1.

[0042] The third magnet 34 and the fourth magnet 36 are examples of the third magnet and the fourth magnet of the present invention, and the third magnet 34 and the fourth magnet 36 form a magnet group Mv4.

[0043] The first magnet 30 and the third magnet 34 have their south poles and north poles facing each other, and the second magnet 32 ​​and the fourth magnet 36 have their north poles and south poles facing each other.

[0044] In the image stabilization device 10, the Hall element h1 is arranged inside the coil C1, and has a mounting surface 42 for the Hall element h1 at position B between a first end face 38 and a second end face 40 that face each other in the height direction (the same as direction A) of the coil C1.

[0045] When the coil C1 is viewed from the height direction A, the coil C1 is configured in an elliptical shape (also called a track-like shape) with a hollow portion inside. In the A direction, the Hall element h1 is disposed inside the coil C1. The Hall element h1 also has a mounting surface 42 at a position B between the first end face 38 and the second end face 40, excluding the positions of the first end face 38 and the second end face 40.

[0046] The image stabilization device 10 of this embodiment has a height adjustment portion 46 and a support member 44 in order to position the mounting surface 42 of the Hall element h1 at position B.

[0047] More specifically, the Hall element h1 is attached to a height adjustment section 46 whose height from the FPC board 28 is adjusted. The height adjustment section 46 is a part of the FPC board 28, and is configured, for example, in a tongue or band shape.

[0048] Furthermore, the height adjustment section 46 is supported on the FPC board 28 by a support member 44. The support member 44 has a thickness in the A direction, and is made of, for example, a molded resin member or an aluminum member. Note that if the height adjustment section 46 itself has rigidity, the support member 44 is not necessary.

[0049] FIG. 4 is a schematic explanatory diagram showing a configuration (hereinafter referred to as a board configuration) for disposing the mounting surface 42 of the Hall element h1 at position B.

[0050] As shown in the plan view before assembly shown in IVA in FIG. 4, the Hall element h1 is attached via a connector 47 to a height adjustment portion 46 having a substantially L-shape extending from the FPC board 28.

[0051] As shown in the plan view and side view after assembly shown in IVB and IVC in Fig. 4, the height adjustment part 46 is folded inside the coil C1, and the board 49 of the Hall element h1 connected to the connector 47 is attached to the FPC board 28 via the support member 44. This results in the board configuration shown in Fig. 3.

[0052] Next, a VCM (Voice Coil Motor) that functions as an actuator for driving the imaging element 20 will be described.

[0053] 3, coil C1 is arranged in a position facing magnet groups Mv1 and Mv4 in direction A. Similarly, although not shown, coil C2 is arranged in a position facing magnet groups Mv2 and Mv5 in direction A, and coil C3 is arranged in a position facing magnet groups Mv3 and Mv6.

[0054] Coil C1 and magnet groups Mv1 and Mv4 constitute VCM1 for driving the X axis. When a PWM control signal (control current) of a predetermined frequency is output from driver 26 (see FIG. 2) to coil C1, VCM1 moves moving part 12 in the X direction by the Lorentz force generated between coil C1 and magnet groups Mv1 and Mv4.

[0055] Coil C2 and magnet groups Mv2 and Mv5 form VCM2 (not shown). VCM2 and the above-mentioned VCM1 form a VCM for rotational drive. By reversing the directions of control currents passed from driver 26 to coil C1 and coil C2, the rotational drive VCM rotates moving section 12 in the θ direction around the optical axis by the Lorentz forces generated between coil C1 and magnet groups Mv1 and Mv4 and between coil C2 and magnet groups Mv2 and Mv5.

[0056] Coil C3 and magnet groups Mv3 and Mv6 constitute a VCM3 (not shown) for driving the Y axis. When a PWM control signal (control current) of a predetermined frequency is output from driver 26 to coil C3, VCM3 moves moving unit 12 in the Y direction by the Lorentz force generated between coil C3 and magnet groups Mv3 and Mv6.

[0057] The FPC board 28 (see FIG. 2) on which the coils C1, C2, and C3 are attached has wiring for driving the VCMs 1, 2, and 3. The FPC board 28 electrically connects the coils C1, C2, and C3 of the VCMs 1, 2, and 3 to the main board (not shown) of the image stabilization device 10.

[0058] Next, a description will be given of a position detection module that functions as a position detection unit that detects the position of the imaging element 20. The position detection module has Hall elements h1, h2, and h3 that form a Hall sensor.

[0059] The Hall element h1 outputs a signal according to the magnetic field generated by the magnet groups Mv1 and Mv4, and the system control unit 24 detects the position of the moving unit 12 in the X direction based on the change in the output of this signal.

[0060] The Hall element h2 outputs a signal according to the magnetic field generated by the magnet groups Mv2 and Mv5, and the system control unit detects the position of the moving unit 12 in the X direction based on the change in the output of this signal.

[0061] The system control unit 24 detects the rotation angle of the moving unit 12 around the optical axis as the position of the moving unit 12 in the θ direction based on the change in the output signal of the Hall element h1 and the change in the output signal of the Hall element h2.

[0062] The Hall element h3 outputs a signal corresponding to the magnetic field generated by the magnet groups Mv3 and Mv6, and the system control unit 24 detects the position in the Y direction of the moving unit 12. The above is the main configuration of the image stabilization device 10 of this embodiment.

[0063] Here, optical image stabilization (OIS) mechanisms that drive the lens have traditionally been the mainstream countermeasures for camera image blur, but in recent years, with improvements in camera performance and the overall miniaturization of camera bodies and lens units, an increasing number of cameras are being equipped with in-body image stabilization (IBIS) mechanisms that drive image sensor 20 to correct image blur. IBIS is also used in image blur correction device 10 of this embodiment.

[0064] In IBIS, a VCM is generally used as an actuator that drives the image sensor 20, and a Hall sensor is generally used as a position detection module that detects the position of the image sensor 20. In a VCM, a magnetic circuit is formed by a coil, a magnet, and a yoke, and in a Hall sensor, a magnetic circuit is formed by a Hall element, a magnet, and a yoke.

[0065] Known VCM configurations include a one-sided configuration in which two magnets (magnet group) are placed on only one of the two yokes, and a double magnet configuration (see Figure 3) in which two magnets (magnet group) are placed on each of the two yokes to increase driving force.

[0066] In the case of a double magnet configuration, two magnets (first to fourth magnets) are arranged facing each other with a coil in between. The image stabilization device 10 of this embodiment also employs a double magnet configuration.

[0067] Comparative Example Several comparative examples will be described below. In the VCMs 4, 5, and 6 shown in Figures 5 to 7 below as comparative examples, components that are the same as or similar to the VCM 1 of the image stabilization device 10 shown in Figures 1 to 4 will be denoted by the same reference numerals.

[0068] A single-sided VCM4 is shown in Figure 5. By placing the Hall element h4 inside the coil C4, as in the VCM4 shown in Figure 5, the VCM4 and the Hall sensor are integrated, making the IBIS smaller.

[0069] In a Hall sensor (position detection module) using a Hall element, it is important to improve position detection accuracy that the change in magnetic flux density on the surface of the Hall element be linear in response to the amount of change in the moving part 12 (see Figure 2). In the VCM4 of Figure 5, the Hall element h4 is directly attached to the FPC board 28, so the attachment surface 42 of the Hall element h4 is on the same plane as the second end surface 40 of the coil C4.

[0070] Here, the following problems arise in a VCM with a double magnet configuration in which the Hall element is directly attached to the FPC board.

[0071] In other words, in the above VCM, if a Hall element is placed inside the coil, there is a problem that the linearity characteristics are likely to deteriorate (low robustness) due to variations in the mounting position of the Hall element in direction A (height direction) (for example, where the mounting surface of the Hall element h1 is located between magnet group Mv1 and magnet group Mv4).

[0072] Therefore, in order to improve the linearity characteristics of the VCM5 with a double magnet configuration shown in FIG. 6, the height of coil C5 in direction A is made lower than that of coil C4 in FIG. 5, and the mounting surface 42 of the Hall element h5 is positioned between the magnet surface 50 of magnet group Mv1 and the magnet surface 52 of magnet group Mv4.

[0073] However, the VCM5 shown in Figure 6 has a new problem in that it is not possible to obtain a large driving force because the coil C5 is small. In recent years, image sensors have become larger due to higher pixel counts and improved image quality processing performance, so in order to effectively drive the IBIS, it is necessary to increase the driving force.

[0074] Note that, as in the VCM6 shown in FIG. 7, if the tall coil C4 shown in FIG. 5 is used instead of the short coil C5 shown in FIG. 6, a greater driving force can be obtained than in the VCM5 shown in FIG. 6, but since the Hall element h6 is directly attached to the FPC board 28, there is a problem in that it is difficult to improve the linearity characteristics.

[0075] [Technology of the present disclosure] Therefore, one technique of the present disclosure is to provide a vibration reduction device that can improve linearity characteristics and obtain a large driving force by solving the problems of deterioration of linearity characteristics and reduction of driving force. Below, a configuration for solving the above problems will be described.

[0076] As shown in Fig. 3, the image stabilization device 10 of this embodiment includes a moving section 12 and a fixed section 14. The fixed section 14 includes a yoke 16 having a first magnet 30 and a second magnet 32, and a yoke 18 having a third magnet 34 and a fourth magnet 36. The moving section 12 includes an FPC board 28 on which a coil C1 and a Hall element h1 are attached. In this way, the image stabilization device 10 of this embodiment employs a double magnet configuration.

[0077] In the image stabilization device 10 of this embodiment, the Hall element h1 is disposed inside the coil C1, and the mounting surface 42 of the Hall element h1 is located at position B between the first end face 38 and the second end face 40 which face each other in the height direction, which is direction A of the coil C1.

[0078] According to the image stabilization device 10 configured as described above, the mounting surface 42 for the Hall element h1 is located at position B between the first end face 38 and the second end face 40 of the coil C1, thereby eliminating the problem of degraded linearity characteristics. Furthermore, since a tall coil C1 (see FIGS. 5 and 7) can be used as the coil, the problem of reduced driving force can be eliminated. As a result, the image stabilization device 10 of this embodiment can improve linearity characteristics and obtain a large driving force.

[0079] Position B of the mounting surface 42 for improving the linearity characteristics may be any position between the first end face 38 and the second end face 40, excluding the positions of the first end face 38 and the second end face 40, but is more preferably an intermediate position between the first end face 38 and the second end face 40. It is even more preferable that the light receiving surface of the image sensor 20 be located in an intermediate position between the first end face 38 and the second end face 40.

[0080] In the image stabilization device 10 of this embodiment, the Hall element h1 is attached to a height adjustment section 46 whose height from the FPC board 28 is adjusted in order to position the mounting surface 42 of the Hall element h1 at position B. This configuration makes it possible to easily position the mounting surface 42 of the Hall element h1 at position B.

[0081] Below, we will explain several modified examples of the substrate configuration for arranging the mounting surface 42 of the Hall element h1 at position B. Note that the same reference numerals will be used to denote components that are the same as or similar to those shown in FIG.

[0082] <First modified example of substrate configuration> 8A, the FPC board 28 located inside the coil C1 has a rectangular opening 29. The height adjustment portion 46 extends laterally from the FPC board 28.

[0083] 8B and 8C are plan and side views after assembly, the height adjustment portion 46 is folded into the back side of the FPC board 28, and the support member 44 is disposed so as to protrude from the opening 29 onto the front side of the FPC board 28. This allows the mounting surface 42 of the Hall element h1 to be disposed at position B (see FIG. 3).

[0084] <Second modified example of substrate configuration> 9A, the FPC board 28 located inside the coil C1 has a rectangular opening 29. The height adjustment portion 46 extends from the edge of the opening 29 toward the inside of the opening 29.

[0085] 9, the height adjustment portion 46 is supported by the support member 44 from the back side of the FPC board 28. This allows the mounting surface 42 of the Hall element h1 to be positioned at position B (see FIG. 3).

[0086] <Third modified example of substrate configuration> As shown in the plan view and side view before assembly (component state) indicated by XA and XB in Figure 10, the FPC board 28 has board pieces 28A and 28B spaced apart from each other on both sides, and a height adjustment section 46 with a Hall element h1 attached to the inside.

[0087] As shown in the plan view and side view before assembly shown by XC and XD in Figure 10, the respective spaced-apart substrate pieces 28A, 28B are connected to each other by connecting member 28C, thereby bending the excess length of height adjustment portion 46 in a convex shape toward the front side.

[0088] Next, as shown in the side views after assembly indicated by XE and XF in Figure 10, the coil C1 is attached to the front side of the FPC board 28, and the height adjustment part 46 is supported from the back side of the FPC board 28 by the support member 44. This allows the mounting surface 42 of the Hall element h1 to be positioned at position B (see Figure 3).

[0089] <Fourth Modification of Board Configuration> As shown in the plan view and side view after assembly indicated by XIA and XIB in Figure 11, the FPC board 28 located inside the coil C1 has a rectangular opening 29. The height adjustment portion 46 extends from the edge of the opening 29 toward the inside of the opening 29, and is bent in an L-shape toward the front side of the FPC board 28, and is supported by a support member 44. This allows the mounting surface 42 of the Hall element h1 to be located at position B (see Figure 3).

[0090] <Fifth Modified Example of Board Configuration> 12, the plan view and side view after assembly shown by XIIA and XIIB, the height adjustment portion 46 is supported on the FPC board 28 by a coil bobbin 48, and the mounting surface 42 of the Hall element h1 is attached to the height adjustment portion 46. Even if the coil bobbin 48 is used as a support member, the mounting surface 42 of the Hall element h1 can be easily positioned at position B.

[0091] Several modified examples of the image stabilization device of the present invention will be described below.

[0092] <First Modification of Image Stabilizer> FIG. 13 shows a first modified example of the vibration reduction device (VCM1).

[0093] The coil C1 of the VCM1 shown in Fig. 13 is divided into a first coil C1-1 and a second coil C1-2. The first coil C1-1 is disposed on the first surface 28D, and the second coil C1-2 is disposed on the second surface 28E, which face each other in the thickness direction (the same as direction A) of the FPC board 28. The Hall element h1 is attached to the first surface 28D. Note that the yokes 16 and 18 are not shown in Fig. 13.

[0094] As in the VCM1 shown in FIG. 13, by providing a first coil C1-1 and a second coil C1-2 on either side of an FPC board 28 and attaching a Hall element h1 to a first surface 28D of the FPC board 28, the mounting surface 42 of the Hall element h1 can be positioned at position B between the first end surface 38 and the second end surface 40 of the coil C1.

[0095] As a result, it is possible to improve the linearity characteristics and obtain a large driving force also in the first modified example shown in Fig. 13. The Hall element h1 may be attached to the second surface 28E of the FPC board 28.

[0096] Furthermore, in the first modified example, it is preferable to provide drivers 60 and 62 that output a first PWM control signal and a second PWM control signal that are out of phase with each other at a predetermined frequency to the first coil C1-1 and the second coil C1-2.

[0097] In this way, by shifting the phases of the first PWM control signal and the second PWM control signal (drive frequency), it is possible to reduce beat noise in the image sensor 20. The first PWM control signal and the second PWM control signal are examples of the first control signal and the second control signal of the present invention, respectively. Furthermore, the drivers 60 and 62 are examples of the electronic circuit of the present invention.

[0098] <Second Modification of Image Stabilizer> FIG. 14 shows a second modified example of the vibration reduction device (VCM1).

[0099] 14 differs from VCM1 shown in Fig. 13 in that the Hall element h1 is attached to the second surface 28E of the FPC board 28 and that a first coil C1-3 is used that is smaller (lower) in direction A (height direction) than the first coil C1-1. Note that the yokes 16 and 18 are also omitted from Fig. 14.

[0100] As shown in FIG. 14, by placing the Hall element h1 inside the second coil C1-2 and making the first coil C1-3 on the side where the Hall element h1 is not placed smaller than the second coil C1-2, it is possible to contribute to the miniaturization of the VCM1.

[0101] 14 shows an example in which the Hall element h1 is attached to the second surface 28E of the FPC board 28, but the Hall element h1 may be attached to the first surface 28D. In this case, a second coil smaller than the first coil C1-1 should be used as the second coil C1-2.

[0102] 14, the inner diameter of the first coil C1-3 is smaller than the inner diameter of the second coil C1-2. The outer diameter of the first coil C1-3 is also smaller than the outer diameter of the second coil C1-2. This contributes to the miniaturization of the VCM1. The inner diameter refers to the minor and major axes of the ellipse.

[0103] Furthermore, if the inner diameter of the first coil C1-3 is smaller than the inner diameter of the second coil C1-2 and the outer shape of the first coil C1-3 is equal to the outer shape of the second coil C1-2, a large driving force can be obtained.

[0104] Also, like the VCM1 in FIG. 14, it is preferable to arrange the first to fourth magnets 30 to 36 so that the first width w1 and the second width w2 are different from each other.

[0105] 14, when the Hall element h1 is disposed inside the coil C1 of the VCM1 having a double magnet configuration, the first through fourth magnets 30 through 36 are disposed so that the first width w1 and the second width w2 are different (for example, first width w1 > second width w2). By making the first width w1 and the second width w2 different, the magnetic flux between the magnets 34, 36 and the magnets 30, 32 bends, resulting in improved linearity characteristics. Note that the relationship between the first width w1 and the second width w2 may be first width w1 < second width w2.

[0106] Figure 15 is a graph showing the relationship between the double magnet configuration and linearity characteristics. The vertical axis of the graph represents magnetic flux density (T), and the horizontal axis represents Hall element displacement (mm).

[0107] The solid line P in the graph of Figure 15 shows the linearity characteristics obtained by a VCM1 with the configuration shown in Figure 14 (e.g., first width w1 > second width w2), while the dashed line Q in the graph shows the linearity characteristics obtained by a VCM with the configuration where first width w1 = second width w2.

[0108] As shown in FIG. 15, the VCM1 having the configuration shown in FIG. 14 can improve the linearity characteristics compared to a VCM having a configuration in which the first width w2=the second width w2.

[0109] In addition, in the configuration of VCM1 in FIG. 14, by arranging the Hall element h1 near the middle between magnet surface 50 and magnet surface 52 in direction A, the robustness of the linearity characteristics against variations in the height of the Hall element h1 is improved.

[0110] In addition, in the VCM1 of Figure 14, by dividing the coil C1 and arranging it on both sides (first surface 28D and second surface 28E) of the FPC board 28, the Hall element h1 can be arranged near the middle between the magnet surface 50 and the magnet surface 52 without reducing the driving force of the VCM1.

[0111] The above example in which the first width w1 and the second width w2 are different is applied to the VCM1 in FIG. 14, but this example can also be applied to the VCM1 in FIG. 13 which has a first coil C1-1 and a second coil C1-2 of equal size.

[0112] In the above embodiment, the image stabilization device (position control device) of the present invention is applied to an IBIS, but the image stabilization device of the present invention can also be applied to an OIS. In this case, the optical device equipped with the image stabilization device is a lens.

[0113] Although the image stabilization device according to the present embodiment has been described above, the present invention may be improved or modified in several ways without departing from the gist of the present invention. [Explanation of symbols]

[0114] 10 Image stabilization device 13 Retaining member 12 Moving section 14 Fixed part 16 York 18 York 20 Image sensor 22 Circuit Board C1 coil C2 coil C3 coil h1 Hall element h2 Hall element h3 Hall element 24 System control section 26 Drivers 28 FPC board 28A board piece 28B board piece 28C Connecting member 28D 1st page 28E 2nd page 29 Opening 30 First Magnet 32 Second magnet 34 Third Magnet 36 Fourth Magnet Mv1 Magnet Group Mv2 Magnet Group Mv3 Magnet Group Mv4 Magnet Group Mv5 Magnet Group Mv6 Magnet Group 38 First end surface 40 Second end face 42 Mounting surface 44 Support member 46 Height adjustment unit 47 Connector 48 Coil bobbin 49 PCB 50 Magnet Surface 52 Magnet surface 60 Drivers 62 Drivers

Claims

1. A first yoke; a first magnet and a second magnet provided on the first yoke and arranged with a first width; a second yoke disposed opposite the first yoke; a third magnet and a fourth magnet provided on the second yoke and arranged with a second width; a fixed portion having a moving part disposed between the first yoke and the second yoke and having a substrate on which a coil and a position detection sensor are attached; Equipped with the position detection sensor is disposed inside the coil, and has a mounting surface for the position detection sensor located between a first end surface and a second end surface of the coil that face each other in a height direction of the coil; Position control device.

2. the position detection sensor is attached to a height adjustment section whose height from the substrate is adjusted; The position control device according to claim 1 .

3. A support member is provided to support the height adjustment unit. The position control device according to claim 2 .

4. The support member is a coil bobbin of the coil. The position control device according to claim 3 .

5. the coil has a first surface and a second surface facing each other in a thickness direction of the substrate, the first coil being disposed on the first surface and the second coil being disposed on the second surface, The position detection sensor is attached to the first surface or the second surface. The position control device according to claim 1 .

6. an electronic circuit that outputs a first control signal and a second control signal that are out of phase with each other at a predetermined frequency to the first coil and the second coil; The position control device according to claim 5 .

7. the first control signal and the second control signal are PWM control signals; The position control device according to claim 6 .

8. When the position detection sensor is attached to the first surface, the inner diameter of the second coil is smaller than the inner diameter of the first coil. The position control device according to claim 5 .

9. The first width and the second width are different from each other. The position control device according to any one of claims 1 to 8.

10. The position control device according to claim 1 is a vibration reduction device, the moving part includes a holding member, The holding member holds an imaging element or an optical element. Image stabilization device.

11. An optical device comprising the image stabilization device according to claim 10.

Images