Image sensor driving device

Abstract

An imaging element driving device that can achieve a miniaturized actuator is provided. [Solution] The image shake correction device 1 includes a front fixing / holding member 32 having a fixing surface, and a drive magnet 27c used to drive the image sensor 12, the drive magnet 27c being arranged along the periphery of the front fixing / holding member 32 and fixed to the fixing surface of the front fixing / holding member 32. A side surface of the drive magnet 27c that is approximately perpendicular to the fixing surface is exposed to the outside along the periphery of the front fixing / holding member 32.

Description

[Technical field]

[0001] The present disclosure relates to an imaging element driving device. [Background technology]

[0002] 2. Description of the Related Art Conventionally, imaging devices having a mechanism for correcting blurring of an optical image during imaging (hereinafter referred to as an "image blur correction mechanism") have been widely used for the purpose of obtaining clear captured images.

[0003] Such image blur correction mechanisms include optical image blur correction mechanisms and image sensor-driven image blur correction mechanisms. Optical image blur correction mechanisms drive a part or all of an optical lens for correction within a plane perpendicular to the optical axis or in a direction tilted relative to the optical axis (see, for example, Patent Document 1). On the other hand, image sensor-driven image blur correction mechanisms drive an image sensor for correction within a plane perpendicular to the optical axis (see, for example, Patent Document 2).

[0004] Also, there is known an imaging device that can obtain a high-definition image from a plurality of pieces of image data by driving an image sensor in minimum pixel units in a plane perpendicular to the optical axis (see, for example, Patent Document 3).

[0005] Furthermore, there is known an imaging device that can obtain a higher resolution image from a plurality of pieces of image data by driving an image sensor at a pitch shorter than the minimum pixel unit in a plane perpendicular to the optical axis (see, for example, Patent Document 4). [Prior art documents] [Patent documents]

[0006] [Patent Document 1] JP 2013-83753 A [Patent Document 2] JP 2012-48215 A [Patent Document 3] JP 2010-73035 A [Patent Document 4] JP 2011-227578 A Summary of the Invention [Problem to be solved by the invention]

[0007] The present disclosure provides an image sensor driving device that can realize a miniaturized actuator. [Means for solving the problem]

[0008] The image sensor driving device of the present disclosure is an image sensor driving device for driving an image sensor, and comprises a yoke having a fixed surface, and a magnet used to drive the image sensor, the magnet being arranged along the peripheral portion of the yoke and fixed to the fixed surface of the yoke, and a side of the magnet that is approximately perpendicular to the fixed surface of the yoke is exposed to the outside along the peripheral portion of the yoke.

[0009] In addition, the image sensor driving device of the present disclosure is an image sensor driving device for driving an image sensor, and includes a yoke having a fixed surface, and a magnet fixed to the fixed surface of the yoke and used to drive the image sensor, and the side surface at the peripheral portion of the yoke is positioned so as to be largely hidden by the magnet when the yoke is viewed from a direction perpendicular to the imaging surface of the image sensor.

[0010] Also, an image sensor driving device according to the present disclosure is an image sensor driving device for driving an image sensor, the image sensor driving device comprising: a fixed frame; a movable frame for holding the image sensor, the movable frame facing the fixed frame in the optical axis direction and displaceable within a plane perpendicular to the optical axis direction relative to the fixed frame; a magnetic body provided on one of the fixed frame and the movable frame; and at least one magnet provided on the other of the fixed frame and the movable frame facing the magnetic body in the optical axis direction, the at least one magnet having an S1 magnetized portion magnetized to an S pole on the side facing the magnetic body; The magnetic body has an N2 magnetized portion arranged adjacent to the S1 magnetized portion in a first direction and magnetized to an N pole, an S3 magnetized portion arranged adjacent to the N2 magnetized portion in a second direction intersecting the first direction and magnetized to an S pole, and an N4 magnetized portion arranged adjacent to the S3 magnetized portion in a third direction intersecting the second direction and adjacent to the S1 magnetized portion, magnetized to an N pole, and when viewed from the optical axis direction, the magnetic body overlaps at least a portion of the S1 magnetized portion, the N2 magnetized portion, the S3 magnetized portion, and the N4 magnetized portion.

[0011] In addition, a manufacturing method for an image sensor driving device in the present disclosure is a manufacturing method for an image sensor driving device that includes a yoke and a magnet fixed to the yoke, and includes the steps of (a) placing the magnet on a base jig, (b) attracting the magnet toward the base jig using an suction jig, (c) applying adhesive to one of the magnet and the yoke, and (d) placing the yoke on the base jig, thereby fixing the magnet to the yoke via the adhesive.

[0012] In addition, the image sensor driving device of the present disclosure is an image sensor driving device for driving an image sensor, and includes a yoke having a fixed surface, and a magnet used to drive the image sensor, the magnet being arranged along the peripheral portion of the yoke and fixed to the fixed surface of the yoke with an adhesive, and the entire back surface of the magnet is in contact with the fixed surface of the yoke via the adhesive. Effect of the Invention

[0013] According to the image sensor driving device of the present disclosure, it is possible to realize a miniaturized actuator. [Brief description of the drawings]

[0014] [Figure 1] FIG. 1 is a perspective view of a digital camera according to an embodiment. [Diagram 2] FIG. 2 is a rear view of the digital camera according to the embodiment. [Diagram 3] FIG. 3 is a front view of the image blur correction device according to the embodiment. [Figure 4] FIG. 4 is an exploded perspective view of the image blur correction device according to the embodiment. [Diagram 5] FIG. 5 is a rear view of the movable frame according to the embodiment. [Figure 6] 6 is a cross-sectional view of the movable frame according to the embodiment taken along line VI-VI in FIG. [Figure 7A] FIG. 7A is a perspective view of the rear surface side of the front fixing holding member according to the embodiment. [Figure 7B] 7B is a cross-sectional view of the front fixing holding member according to the embodiment taken along line VII-VII in FIG. 7A. [Figure 8] FIG. 8 is a perspective view for explaining a method of adhering the drive magnet to the front fixed holding member according to the embodiment. [Figure 9] FIG. 9 is a front view of the rear surface fixing and holding member according to the embodiment. [Figure 10A] FIG. 10A is a diagram showing magnetization of a sensor magnet according to an embodiment. [Figure 10B] FIG. 10B is a diagram showing the magnetization of the sensor magnets according to Comparative Examples 1 and 2. As shown in FIG. [Figure 11] FIG. 11 is a graph showing the relationship between the diagonal position of the suction plate and the suction force acting on the suction plate in the optical axis direction in Experiment 1. [Figure 12] FIG. 12 is a graph showing the relationship between the diagonal position of the attraction plate and the torque acting on the attraction plate in Experiment 1. [Figure 13] FIG. 13 is a diagram showing the torque measurement conditions in Experiment 1. [Figure 14]FIG. 14 is a graph showing the relationship between the diagonal position of the suction plate and the suction force acting on the suction plate in the optical axis direction in Experiment 2. [Figure 15] FIG. 15 is a graph showing the relationship between the diagonal position of the attraction plate and the torque acting on the attraction plate in Experiment 2. [Figure 16] FIG. 16 is a diagram showing the torque measurement conditions in Experiment 2. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0015] (Findings on which this disclosure is based) The present inventors have found that the techniques described in the "Background Art" section have the following problems.

[0016] An imaging device (e.g., a digital camera) having an image blur correction mechanism of an image sensor drive type includes an image sensor and an image sensor drive device for driving the image sensor. The image sensor drive device includes a fixed frame, a movable frame that is displaceable two-dimensionally in a plane perpendicular to the optical axis relative to the fixed frame, and an actuator for displacing the movable frame relative to the fixed frame. The image sensor is attached to the movable frame and is displaceable together with the movable frame relative to the fixed frame. The imaging device calculates the displacement direction and displacement amount of the image sensor in the above-mentioned plane from the output of an angular velocity sensor provided in the imaging device body, and corrects the blur of the subject image of the photographing lens formed on the image sensor based on the calculated displacement direction and displacement amount.

[0017] Here, the amount of displacement of the imaging element is the amount of movement of the imaging element in a plane perpendicular to the optical axis from a reference position (a position when the imaging element is not displaced) in the same plane.

[0018] The movable frame is supported displaceably on the fixed frame via a rolling bearing composed of at least three ball members. For this reason, a force (hereinafter referred to as "attractive force") is required to bias the movable frame toward the fixed frame via the ball members. Methods for generating this attractive force include a tension spring method and a magnetic attraction method.

[0019] In the tension spring method, the spring force increases according to the amount of displacement of the imaging element, and not only the attractive force of the movable frame toward the fixed frame but also the force in the opposite direction to the displacement direction of the imaging element increases. Furthermore, in the tension spring method, static contact between the movable frame and the fixed frame cannot be avoided, so friction between the movable frame and the fixed frame due to the displacement of the movable frame adversely affects the control of the actuator.

[0020] On the other hand, in the magnetic attraction method, the attractive force decreases according to the amount of displacement of the image sensor, and a force similar to that of a tension spring is generated in the opposite direction to the displacement direction of the image sensor. Therefore, in both methods, there is a problem that the control of the actuator becomes very complicated.

[0021] The actuator also has a yoke and a number of magnets fixed to the yoke. Conventionally, the following two methods have been used to fix the magnets. In the first method, holes are pre-drilled in the yoke, and adhesive is poured through the holes into the gaps between the yoke and the magnets in contact with the yoke. On the other hand, in the second method, the magnets are temporarily placed on the yoke and positioned relative to the yoke, and then adhesive is poured from the corners of the magnets into the gaps between the magnets and the yoke.

[0022] However, the first method has the problem that the volume of the yoke is reduced by the amount of the hole because it is necessary to drill a hole in the yoke, and the magnetic force to the coil is reduced, while the second method has the problem that the actuator becomes larger because it is necessary to secure space in the yoke to pour adhesive into the corners of the magnet.

[0023] The present disclosure is based on such knowledge, and as a result of extensive research by the inventors, they have come up with an idea for an image sensor driving device capable of stably driving an image sensor, a manufacturing method for an image sensor driving device, and an image sensor.

[0024] Hereinafter, the embodiments will be described in detail with reference to the drawings as appropriate. However, more detailed explanation than necessary may be omitted. For example, detailed explanation of already well-known matters or duplicate explanation of substantially the same configuration may be omitted. This is to avoid the following explanation becoming unnecessarily redundant and to facilitate understanding by those skilled in the art.

[0025] The inventors provide the accompanying drawings and the following description so that those skilled in the art can fully understand the present disclosure, and do not intend for them to limit the subject matter described in the claims.

[0026] In the following embodiment, a digital camera is used as an example of an "imaging device". In the following description, "front (positive direction of Z axis)", "rear (negative direction of Z axis)", "up (positive direction of Y axis)", "down (negative direction of Y axis)", "right (negative direction of X axis)" and "left (positive direction of X axis)" are terms based on an imaging device in a landscape orientation facing a subject, with the subject side being the "front" and the opposite side of the subject (i.e., the photographer side) being the "rear". In addition, the rotation direction around the Y axis (up-down direction) is the "pitch direction", the rotation direction around the X axis (left-right direction) is the "yaw direction", and the rotation direction around the Z axis is the "roll direction".

[0027] (Embodiment) [1. Configuration] [1-1. Overview of digital camera] First, a schematic configuration of a digital camera 100 (an example of an imaging device) according to the first embodiment will be described with reference to Fig. 1 and Fig. 2. Fig. 1 is a perspective view of the digital camera 100 according to the embodiment. Fig. 2 is a rear view of the digital camera 100 according to the embodiment.

[0028] 1 and 2, the digital camera 100 includes a camera body 101 (an example of an imaging device) and a lens unit 200 (an example of an imaging device). The digital camera 100 is, for example, an interchangeable lens type digital camera.

[0029] As shown in FIGS. 1 and 2, the camera body 101 includes a housing 10, a body mount 20, a shutter button 30, a hot shoe 40, a flash emission unit 50, an electronic viewfinder 60, and a display device 70.

[0030] The housing 10 houses the image stabilization device 1 (see FIG. 3) and the like. The housing 10 has a front surface S1, an upper surface S2, a rear surface S3, and a lower surface S4. The body mount 20 is provided on the front surface S1 of the housing 10. The lens unit 200 can be attached to the body mount 20 by bayonet coupling or the like. The body mount 20 has an opening 20a centered on the optical axis AX of the lens unit 200. The optical axis AX is an axis parallel to the Z axis. Incident light from the lens unit 200 is guided into the housing 10 through the opening 20a. The shutter button 30 is provided on the upper surface S2 of the housing 10. The shutter button 30 accepts the opening and closing operation of the shutter by the photographer (user).

[0031] The hot shoe 40 is provided on the upper surface S2 of the housing 10. A general-purpose external component (for example, a flash light emitting device, etc.) can be attached to the hot shoe 40. The flash light emitting unit 50 is provided on the upper surface S2 of the housing 10. The flash light emitting unit 50 can be stored inside the housing 10. Note that Figs. 1 and 2 show a state in which the flash light emitting unit 50 is pulled out from the housing 10. The electronic viewfinder 60 is provided on the rear surface S3 of the housing 10. The electronic viewfinder 60 displays an image of the shooting range. The photographer can observe the image displayed on the electronic viewfinder 60. The display device 70 is provided on the rear surface S3 of the housing 10. The display device 70 displays an image of the shooting range, an operation menu, etc. As the display device 70, for example, a liquid crystal display, an organic EL (Electro-Luminescence) display, an inorganic EL display, etc. can be used.

[0032] Furthermore, the camera body 101 includes a shutter unit (not shown), an image blur correction device 1 (an example of an image sensor driving device) (see FIG. 3), an image sensor 12 (see FIG. 6), a circuit board 13 (see FIG. 5), and a control circuit board (not shown). These are arranged inside the housing 10. The image sensor 12 is configured, for example, by a CMOS (Complementary Metal Oxide Semiconductor) image sensor, a CCD (Charge-Coupled Device) image sensor, or the like.

[0033] In the present embodiment, the digital camera 100 is an interchangeable lens type digital camera, but the present invention is not limited to this. The digital camera 100 may be, for example, a digital camera with an integrated lens, or a single-lens reflex digital camera.

[0034] 1, lens unit 200 is an interchangeable lens unit. Lens unit 200 has lens mount 201 attached to body mount 20 of camera body 101, focus ring 202 which is an operation unit for driving a focus lens, and zoom ring 203 which is an operation unit for driving a zoom lens. Lens unit 200 further includes an optical system including a lens controller, a focus lens and a zoom lens, a focus lens driving unit, a zoom lens driving unit, an aperture, an aperture driving unit, a dynamic random access memory (DRAM), a flash memory, and the like, all of which are not shown in the figure.

[0035] Light from a subject enters the camera body 101 through an optical system inside the lens unit 200 and is received by the light receiving surface of the image sensor 12. The optical image received by the image sensor 12 is converted into an electric signal, that is, image data. The image data is subjected to a predetermined process (for example, AD (Analog / Digital) conversion) by the circuit board 13, and then displayed on the display device 70 by the control circuit board. The circuit board 13 is equipped with a controller that executes a predetermined program stored in a non-volatile memory such as a ROM (Read Only Memory), a RAM that temporarily stores data during control operations and image processing operations, and the like. The controller is composed of, for example, a CPU (Central Processing Unit), an MPU (Micro Processing Unit), a DSP (Digital Signal Processing), an FPGA (Field Programmable Gate Array), or an ASIC (Application Specific Integrated Circuit), etc.

[0036] [1-2. Outline of the image stabilization device] Next, a schematic configuration of the image blur correction device 1 according to the embodiment will be described with reference to FIGS. 3 to 7B.

[0037] FIG. 3 is a front view of an image shake correction device 1 according to an embodiment. FIG. 4 is an exploded perspective view of an image shake correction device 1 according to an embodiment. FIG. 5 is a rear view of a movable frame 11 according to an embodiment. FIG. 6 is a cross-sectional view of the movable frame 11 according to the embodiment taken along line VI-VI in FIG. 5. FIG. 7A is a perspective view of the rear side of a front fixed holding member 32 according to an embodiment. FIG. 7B is a cross-sectional view of a front fixed holding member 32 according to an embodiment taken along line VII-VII in FIG. 7A.

[0038] The image blur correction device 1 is a drive mechanism for driving the imaging element 12. As shown in Fig. 3 to Fig. 7A, the image blur correction device 1 includes a movable frame 11, a circuit board 13, ball holding portions 110a, 110b, and 110c, drive coils 15, 16, and 17, drive magnets 25a, 25b, 25c, 25d, 26b, 26d, 27a, 27b, 27c, and 27d (examples of magnets), magnetic displacement detection sensors 14a, 14b, and 14c (examples of displacement detection portions), sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b (examples of magnets), an attraction plate 19 (an example of a magnetic body), a rear fixed holding member 21 (an example of a fixed frame and a yoke), and a front fixed holding member 32 (an example of a yoke).

[0039] As shown in Fig. 5, the movable frame 11 is provided with the circuit board 13, the ball holding portions 110a, 110b, and 110c, the driving coils 15, 16, and 17, the magnetic displacement detection sensors 14a, 14b, and 14c, and the attraction plate 19. As shown in Fig. 4, the driving magnets 25a, 25b, 26b, 27a, and 27b and the sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b are attached to the rear fixed holding member 21 by adhesive. As shown in Fig. 7A, the driving magnets 25c, 25d, 26d, 27c, and 27d are attached to the front fixed holding member 32 by adhesive 28 (see Fig. 7B).

[0040] 7B, the entire back surface of each of the drive magnets 27c and 27d is in contact with the fixed surface (surface facing the movable frame 11) of the front fixed holding member 32 via the adhesive 28. Although not shown, the entire back surfaces of the other drive magnets 25c, 25d, and 26d are also in contact with the fixed surface of the front fixed holding member 32 via the adhesive 28. Furthermore, although not shown, the entire back surfaces of each of the drive magnets 25a, 25b, 26b, 27a, and 27b and the sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b are in contact with the fixed surface of the rear fixed holding member 21 (surface facing the movable frame 11) via the adhesive.

[0041] As shown in Figs. 3 to 6, the movable frame 11 is for holding the imaging element 12, and is disposed opposite each of the rear fixed holding member 21 and the front fixed holding member 32. The imaging element 12 is fixed to the movable frame 11 by adhesive or the like. The movable frame 11 holds the imaging element 12 so that it can be displaced in a plane perpendicular to the optical axis AX. The circuit board 13 is electrically connected to the imaging element 12, and converts an electrical signal from the imaging element 12 from an analog signal to a digital signal. The ball holding portions 110a, 110b, and 110c hold ball members 31a, 31b, and 31c (an example of a support member) (see Fig. 4) for connecting the movable frame 11 and the rear fixed holding member 21. The ball members 31a, 31b, and 31c support the movable frame 11 so that it can be displaced relative to the rear fixed holding member 21. The ball holding portions 110a, 110b, and 110c will be described in detail later. The movement of the movable frame 11 relative to the rear fixing and holding member 21 is restricted by a movement restricting mechanism (described later).

[0042] As shown in FIG. 5, the three drive coils 15, 16, and 17 are fixed to the movable frame 11 by adhesive. The terminals of the drive coils 15, 16, and 17 are electrically connected to the circuit board 13 via FPCs (Flexible Printed Circuits) and are supplied with power from the circuit board 13. The drive coil 15 is disposed to face two pairs of drive magnets 25a, 25c and drive magnets 25b, 25d in the direction of the optical axis AX. The drive coil 16 is disposed to face two pairs of drive magnets 26b, 26d and drive magnets 27a, 27c in the direction of the optical axis AX. The drive coil 17 is disposed to face two pairs of drive magnets 27a, 27c and drive magnets 27b, 27d in the direction of the optical axis AX. The drive coils 15 to 17 and drive magnets 25a to 27d constitute an actuator that drives the image sensor 12.

[0043] In this embodiment, each of the driving magnets 25a, 25d, 26d, 27a, and 27d is magnetized to an N pole on the side facing the driving coils 15, 16, and 17. Each of the driving magnets 25b, 25c, 26b, 27b, and 27c is magnetized to an S pole on the side facing the driving coils 15, 16, and 17. Here, the pair of driving magnets 27a and 27c is arranged to face both the driving coil 16 and the driving coil 17 (shared), but four magnets may be used instead of the pair of driving magnets 27a and 27c. In other words, two magnets out of the four magnets may be arranged to face the driving coil 16, and the remaining two magnets may be arranged to face the driving coil 17.

[0044] As shown in FIG. 5, the three magnetic displacement detection sensors 14a, 14b, and 14c are disposed on the circuit board 13. Each of the magnetic displacement detection sensors 14a, 14b, and 14c is formed of, for example, a Hall element. As shown in FIG. 9, which will be described later, on the rear fixed holding member 21 facing the magnetic displacement detection sensors 14a, 14b, and 14c, sensor magnets 22a and 22b facing the magnetic displacement detection sensor 14a in the optical axis AX direction, sensor magnets 23a and 23b facing the magnetic displacement detection sensor 14b in the optical axis AX direction, and sensor magnets 24a and 24b facing the magnetic displacement detection sensor 14c in the optical axis AX direction are disposed. The magnetic displacement detection sensors 14a, 14b, and 14c and the sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b constitute a displacement detection mechanism that detects the displacement of the imaging element 12 (movable frame 11) relative to the rear fixed holding member 21. The displacement detection mechanism will be described later.

[0045] 4 and 9 described later, each of the sensor magnets 22a, 23a, and 24a is magnetized to the S pole on the side facing the movable frame 11 (attraction plate 19 described later) and is magnetized to the N pole on the side opposite the attraction plate 19. Moreover, each of the sensor magnets 22b, 23b, and 24b is magnetized to the N pole on the side facing the movable frame 11 (attraction plate 19) and is magnetized to the S pole on the side opposite the attraction plate 19.

[0046] Here, sensor magnets 22a, 22b, 23a, and 23b are examples of a first magnet, a second magnet, a third magnet, and a fourth magnet, respectively. The S pole side of sensor magnet 22a is an example of an S1 magnetized portion, and the N pole side is an example of an N1 magnetized portion. Moreover, the N pole side of sensor magnet 22b is an example of an N2 magnetized portion, and the S pole side is an example of an S2 magnetized portion. Moreover, the S pole side of sensor magnet 23a is an example of an S3 magnetized portion, and the N pole side is an example of an N3 magnetized portion. Moreover, the N pole side of sensor magnet 23b is an example of an N4 magnetized portion, and the S pole side is an example of an S4 magnetized portion.

[0047] If the complexity of magnetization is acceptable, one magnet may be formed with S1-S4 magnetized portions and N1-N4 magnetized portions, or one magnet may be formed with S1, S2 magnetized portions and N1, N2 magnetized portions, and another magnet may be formed with S3, S4 magnetized portions and N3, N4 magnetized portions.

[0048] The attraction plate 19 is made of a magnetic material such as a metal plate. As shown in Figs. 4 to 6, the attraction plate 19 is disposed on the movable frame 11 so as to face the sensor magnets 22a, 22b, 23a, and 23b. The attraction plate 19 attracts the movable frame 11 toward the rear fixed holding member 21 by utilizing the magnetic forces of the sensor magnets 22a, 22b, 23a, and 23b. This allows the ball members 31a, 31b, and 31c held by the ball holding portions 110a, 110b, and 110c, which will be described later, to be biased toward the rear fixed holding member 21 and pressed against the movable frame 11. The attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b constitute a magnetic attraction mechanism. The magnetic attraction mechanism will be described later.

[0049] The rear surface fixing and holding member 21 is fixed to a support frame (not shown) within the camera body 101 .

[0050] [1-3. Ball holding area] Next, the ball holding portions 110a, 110b, and 110c will be described with reference to FIGS.

[0051] As shown in Fig. 5, the ball holding portions 110a, 110b, and 110c are formed in a substantially rectangular shape in a plan view, and are disposed at three locations on the movable frame 11. As shown in Fig. 5 and Fig. 6, the ball holding portions 110a, 110b, and 110c have standing walls 110d, 110e, and 110f that surround the ball members 31a, 31b, and 31c, respectively. Note that the standing walls 110d, 110e, and 110f are surfaces that are substantially parallel to the optical axis AX among the surfaces that form the ball holding portions 110a, 110b, and 110c, respectively.

[0052] Further, the ball holding parts 110a, 110b, 110c each have a surface (hereinafter referred to as a "ball contact surface") against which the ball members 31a, 31b, 31c contact and perpendicular to the optical axis AX. As shown in FIG. 9 described later, the ball contact surfaces of the ball holding parts 110a, 110b, 110c are respectively made of metal plates 111a, 111b, 111c having a smooth surface. That is, the rear surface fixing holding member 21 has a surface substantially perpendicular to the optical axis AX at a position facing the ball members 31a, 31b, 31c, and the surface is formed smoothly. The metal plates 111a, 111b, 111c are fixed to the rear surface fixing holding member 21 by adhesive or the like.

[0053] [1-4. Actuator] [1-4-1. Actuator configuration] Next, the configuration of the actuator will be described with reference to FIGS. 4, 5 and 7A.

[0054] The actuator is a drive source for displacing the movable frame 11 (imaging element 12) relative to the rear fixed holding member 21. As shown in Fig. 4, Fig. 5 and Fig. 7A, the actuator is composed of drive coils 15, 16, 17 and three sets of six pairs of drive magnets (i.e., a pair of drive magnets 25a, 25c and a pair of drive magnets 25b, 25d, a pair of drive magnets 26b, 26d and a pair of drive magnets 27a, 27c, and a pair of drive magnets 27a, 27c and a pair of drive magnets 27b, 27d). The actuator displaces the movable frame 11 relative to the rear fixed holding member 21, thereby correcting image blur caused by the movement of the camera body 101.

[0055] As shown in Fig. 4, drive magnets 25a, 25b, 26b, 27a, and 27b are disposed on rear fixed holding member 21 disposed on the rear side (opposite the subject) of image sensor 12 so as to face drive coils 15, 16, and 17. As shown in Fig. 7A, drive magnets 25c, 25d, 26d, 27c, and 27d are disposed on front fixed holding member 32 disposed on the front side (subject side) of image sensor 12 so as to face drive coils 15, 16, and 17.

[0056] Each of the drive coils 15, 16, and 17 moves from the center position relative to the corresponding set of the six pairs of drive magnets in the three sets according to the power supply direction from the circuit board 13. The three drive coils 15, 16, and 17 are provided in order to rotate the movable frame 11 (imaging element 12) around the Z axis in a plane perpendicular to the optical axis AX. Specifically, the drive coil 15 is supplied with power to drive it in the positive direction of the X axis shown in FIG. 4, and the drive coil 16 is supplied with power to drive it in the negative direction of the X axis. At this time, rotation occurs around the Z axis, but the center of rotation is not determined. For this reason, the center of rotation can be determined according to the amount and direction of power supply to the drive coil 17. In addition, when rotation around the Z axis is not required, it is possible to drive the drive coils 15 and 16 in the X axis direction by supplying power in the same phase to the drive coils 15 and 16, and drive the drive coils in the Y axis direction by supplying power to the drive coil 17. However, since it is difficult to align the center of gravity of the movable frame 11 itself with the center of gravity of the driving force, the amount and direction of power supplied to each of the driving coils 15, 16, and 17 is controlled in accordance with the output of a displacement detection unit (described later), and the movable frame 11 is driven in the X-axis direction, Y-axis direction, and roll direction.

[0057] [1-4-2. How to attach the drive magnet] Generally, the magnet is attached to a magnetic body called a yoke. Therefore, when attaching a magnet to a yoke using conventional methods, the magnet is attracted to the yoke, making it difficult to attach the magnet to the yoke with high accuracy.

[0058] Therefore, in this embodiment, as described below, a method is proposed in which the positioning of the magnet relative to the yoke and the bonding of the magnet to the yoke are performed simultaneously.

[0059] Hereinafter, as an example of a method for bonding a magnet to a yoke, a method for bonding drive magnets 25c, 25d, 26d, 27c, and 27d to front fixed holding member 32 will be described with reference to Fig. 8. Fig. 8 is a perspective view for explaining a method for bonding drive magnets 25c, 25d, 26d, 27c, and 27d to front fixed holding member 32 according to the embodiment.

[0060] As shown in FIG. 8, in this embodiment, when the drive magnets 25c, 25d, 26d, 27c, and 27d are adhered to the front fixed holding member 32, a suction jig 500 and a base jig 600 are used.

[0061] The attraction jig 500 is a jig for magnetically attracting the drive magnets 25c, 25d, 26d, 27c, and 27d toward the base jig 600. Attracting magnets 525c, 525d, 526d, 527c, and 528c are attached to the protruding portion of the attraction jig 500. The attraction magnets 525c, 525d, 526d, 527c, and 528c are arranged corresponding to the drive magnets 25c, 25d, 26d, 27c, and 27d, respectively. The attraction magnets 525c and 527c are magnetized to the N pole on the side facing the base jig 600. The attraction magnets 525d, 526d, and 527d are magnetized to the S pole on the side facing the base jig 600.

[0062] The base jig 600 is a jig for positioning the driving magnets 25c, 25d, 26d, 27c, and 27d with respect to the front fixed holding member 32. Positioning parts 601, 602, 603, and 604 are attached to the base jig 600. The positioning parts 601, 602, 603, and 604 are for positioning the driving magnets 25c, 25d, 26d, 27c, and 27d. In addition, grooves (not shown) are provided on the surface of the base jig 600 on the suction jig 500 side into which the suction magnets 525c, 525d, 526d, 527c, and 528c attached to the protruding parts of the suction jig 500 can be inserted. In addition, the base jig 600 is provided with position regulating pins 605a and 605b for positioning the front fixed holding member 32 with respect to the base jig 600. The front fixed holding member 32 is provided with position restriction holes 701a and 701b into which the position restriction pins 605a and 605b are inserted, respectively.

[0063] Hereinafter, a specific description will be given of a method for adhering the driving magnets 25c, 25d, 26d, 27c, and 27d to the front fixed holding member 32. As shown in Fig. 8, first, the driving magnets 25c, 25d, 26d, 27c, and 27d are placed on a base jig 600. At this time, the driving magnets 25c, 25d, 26d, 27c, and 27d are positioned with respect to the base jig 600 by positioning portions 601, 602, 603, and 604.

[0064] Thereafter, the attraction magnets 525c, 525d, 526d, 527c, and 528c of the attraction jig 500 are inserted into the grooves of the base jig 600, and the attraction magnets 525c, 525d, 526d, 527c, and 528c magnetically attract the drive magnets 25c, 25d, 26d, 27c, and 27d, respectively.

[0065] Thereafter, adhesive is applied to the rear surfaces of the drive magnets 25c, 25d, 26d, 27c, and 27d (i.e., the surfaces facing the front fixed holding member 32). Thereafter, the front fixed holding member 32 is placed on the base jig 600, whereby the drive magnets 25c, 25d, 26d, 27c, and 27d are adhered to the front fixed holding member 32 with the adhesive.

[0066] This allows the drive magnets 25c, 25d, 26d, 27c, and 27d to be fixed to the front fixed holding member 32 without drilling holes in the front fixed holding member 32, which is the yoke. Also, since there is no need to secure extra space in the front fixed holding member 32 for pouring adhesive into each corner of the drive magnets 25c, 25d, 26d, 27c, and 27d, the drive magnets 25c, 25d, 26d, 27c, and 27d can be arranged along the periphery of the front fixed holding member 32, as shown in Fig. 7B. As a result, the actuator can be made smaller while ensuring a large magnetic force by enlarging the drive magnets 25c, 25d, 26d, 27c, and 27d.

[0067] In this embodiment, the front fixing and holding member 32 is installed on the surface of the base jig 600 opposite to the suction jig 500, but the front fixing and holding member 32 may be sandwiched between the suction jig 500 and the base jig 600. Also, instead of the suction magnets 525c, 525d, 526d, 527c, and 528c, a coil may be arranged on the suction jig 500 and a current may be passed through the coil to magnetically attract the drive magnets 25c, 25d, 26d, 27c, and 27d. Also, in this embodiment, an adhesive is applied to the back surface of each of the drive magnets 25c, 25d, 26d, 27c, and 27d, but an adhesive may be applied to the front fixing and holding member 32.

[0068] In addition, the above-mentioned bonding method is applicable not only to the case where the drive magnets 25c, 25d, 26d, 27c, and 27d are bonded to the front fixed holding member 32, but also to the case where the drive magnets 25a, 25b, 26b, 27a, and 27b are bonded to the rear fixed holding member 21, and also to the case where the sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b are bonded to the sensor magnet yoke plate 29 (see Figure 9 described later).

[0069] [1-5. Displacement detection mechanism] Next, the displacement detection mechanism will be described with reference to Fig. 5 and Fig. 9. Fig. 9 is a front view of the rear surface fixing and holding member 21 according to the embodiment.

[0070] As shown in FIGS. 5 and 9, the displacement detection mechanism is made up of magnetic displacement detection sensors 14a, 14b, and 14c and sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b.

[0071] As shown in FIG. 5, magnetic displacement detection sensors 14a, 14b, and 14c are arranged at three locations on the rear side of the imaging element 12 of the circuit board 13. Each of the magnetic displacement detection sensors 14a, 14b, and 14c detects the displacement of the imaging element 12 in at least one of the X-axis direction and the Y-axis direction. Another magnetic displacement detection sensor is arranged in either the X-axis direction or the Y-axis direction. In this embodiment, the magnetic displacement detection sensors 14a and 14b are arranged at two locations for detecting the displacement in the X-axis direction, and the magnetic displacement detection sensor 14c is arranged at one location for detecting the displacement in the Y-axis direction. At this time, the midpoint C of the line connecting the two magnetic displacement detection sensors 14a and 14b that detect the displacement in the X-axis direction is approximately the center position of the imaging element 12 in forming a magnetic attraction mechanism described later.

[0072] 9, a pair of sensor magnets 22a, 22b, a pair of sensor magnets 23a, 23b, and a pair of sensor magnets 24a, 24b are arranged at positions corresponding to the magnetic displacement detection sensors 14a, 14b, and 14c, respectively, on the rear surface fixed holding member 21. The sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b are fixed to a sensor magnet yoke plate 29 fixed to the rear surface fixed holding member 21 by an adhesive or the like.

[0073] In this embodiment, the sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b are fixed to the sensor magnet yoke plate 29 of the rear surface fixing and holding member 21 with an adhesive by the above-mentioned bonding method.

[0074] The above-described displacement detection mechanism makes it possible to accurately detect the displacement of the imaging element 12 at least in the X direction, Y direction, and roll direction.

[0075] [1-6. Magnetic attraction mechanism] [1-6-1. Configuration of magnetic attraction mechanism] Next, the configuration of the magnetic attraction mechanism will be described with reference to Figures 4, 5, 6 and 9. As shown in Figures 5 and 9, the magnetic attraction mechanism is composed of an attraction plate 19 and sensor magnets 22a, 22b, 23a and 23b.

[0076] As shown in Figures 4 and 5, in the ball holding parts 110a, 110b, and 110c, if the image sensor 12 is not constantly pressed toward the rear fixed holding member 21, the ball members 31a, 31b, and 31c will fall off, and smooth driving by rolling will not be possible. Therefore, in this embodiment, an attractive force is applied between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, 23b, and 24a by utilizing the magnetic force of the sensor magnets 22a, 22b, 23a, 23b, and 24a, and 24b toward the magnetic displacement detection sensors 14a, 14b, and 14c. This makes it possible to solve the problems caused by the conventional tension spring method described above, and also makes it unnecessary to provide a space for arranging the tension spring, thereby realizing a small-sized image blur correction device 1 with high control performance.

[0077] Specifically, as shown in Fig. 5 and Fig. 6, the suction plate 19 is fixed to the holding member 18 attached to the movable frame 11 by adhesive or the like. The holding member 18 is formed of, for example, aluminum or the like. The suction plate 19 is arranged so that the center of the suction plate 19 coincides with the midpoint C of the gap surrounded by the sensor magnets 22a, 22b, 23a, and 23b in a plane perpendicular to the optical axis AX when the suction plate 19 is held at the center position in the movable range of the image sensor 12 (i.e., the suction plate 19 is not displaced relative to the rear fixed holding member 21). The suction plate 19 is arranged so that two opposing sides 19L1 and 19L3 (see Fig. 10A described later) of the suction plate 19 are parallel to the X-axis direction, and the remaining two opposing sides 19L2 and 19L4 (see Fig. 10A described later) are parallel to the Y-axis direction.

[0078] 6, the imaging element 12, the circuit board 13, the magnetic displacement detection sensors 14a, 14b, and 14c, the holding member 18, and the attraction plate 19 are arranged in this order along the optical axis AX direction, and are fixed to the movable frame 11 by screw fastening or the like. This configuration makes it possible for the attraction plate 19 to attract the sensor magnets 22a, 22b, 23a, and 23b at the substantial center of the imaging element 12, i.e., in the vicinity of the optical axis AX. Therefore, a stable attraction force can be maintained even when the imaging element 12 is displaced.

[0079] [1-6-2. Function of magnetic attraction mechanism] The magnetic attraction force of the attraction plate 19 to the sensor magnets 22a, 22b, 23a, and 23b changes as the movable frame 11 is displaced relative to the rear fixed holding member 21. The change in the magnetic attraction force also changes the rotational torque acting on the movable frame 11. Since the rotational torque becomes a load on the actuator when correcting image blur, it is desirable to suppress the rotational torque.

[0080] Here, in order to investigate the relationship between the sensor magnets 22a, 22b, 23a, 23b and the magnetic attractive force (hereinafter referred to as "attractive force") and the rotational torque (hereinafter referred to as "torque"), the following Experiments 1 and 2 were carried out.

[0081] [1-6-2-1. Experiment 1] Hereinafter, Experiment 1 will be described with reference to Figures 10A to 13. In Experiment 1, the suction force and torque acting on suction plate 19 when suction plate 19 was moved were compared between Example and Comparative Example 1.

[0082] Fig. 10A is a diagram showing magnetization of sensor magnets 22a, 22b, 23a, and 23b according to the embodiment. Fig. 10B is a diagram showing magnetization of sensor magnets 22a, 22b, 23a, and 23b according to comparative examples 1 and 2. Fig. 11 is a graph showing the relationship between the diagonal position of attraction plate 19 and the attraction force acting on attraction plate 19 in the direction of optical axis AX in experiment 1. Fig. 12 is a graph showing the relationship between the diagonal position of attraction plate 19 and the torque acting on attraction plate 19 in experiment 1. Fig. 13 is a diagram showing the measurement conditions of torque in experiment 1.

[0083] As shown in FIG. 10A, in the example, similar to the present embodiment, the sensor magnets 22a and 23a were magnetized with the same pole (S pole) on the side facing the attraction plate 19, and the sensor magnets 22b and 23b were magnetized with the same pole (N pole) on the side facing the attraction plate 19.

[0084] More specifically, on the side facing the attraction plate 19 (the positive direction of the Z axis), each of the sensor magnets 22a, 22b, 23a, and 23c has an S1 magnetized portion which is the S pole of the sensor magnet 22a, an N2 magnetized portion of the sensor magnet 22b which is the N pole arranged adjacent to the S1 magnetized portion in the L1 direction (the negative direction of the X axis, an example of the first direction), an S3 magnetized portion of the sensor magnet 23a which is the S pole arranged adjacent to the N2 magnetized portion in the L2 direction (the negative direction of the Y axis, an example of the second direction) that intersects with the L1 direction, and an N4 magnetized portion of the sensor magnet 23b which is the N pole arranged adjacent to the S3 magnetized portion in the L3 direction (the positive direction of the X axis, an example of the third direction) that intersects with the L2 direction and adjacent to the S1 magnetized portion. Furthermore, when viewed from the direction of the optical axis AX (Z-axis direction), the attraction plate 19 overlapped at least a portion of the S1 magnetized portion, the N2 magnetized portion, the S3 magnetized portion, and the N4 magnetized portion.

[0085] In addition, the positions facing the optical axis AX direction of the S1 magnetized portion, the N2 magnetized portion, the S3 magnetized portion, and the N4 magnetized portion (the negative side of the Z axis) were magnetized to the N1 magnetized portion as an N pole, the S2 magnetized portion as an S pole, the N3 magnetized portion as an N pole, and the S4 magnetized portion as an S pole, respectively. The gap between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b was 0.73 mm. The size of the attraction plate 19 was 6.5 mm x 8.2 mm.

[0086] In the embodiment, the L1 direction and the L2 direction are perpendicular to each other, and the L1 direction and the L3 direction are parallel to each other. However, if the complexity of position detection is allowed, the L1 direction and the L2 direction do not necessarily have to be perpendicular to each other, and the L1 direction and the L3 direction do not necessarily have to be parallel to each other.

[0087] 10B, in Comparative Example 1, the sensor magnets 22a and 23b were magnetized with the same pole (S pole) on the side facing the attraction plate 19, and the sensor magnets 22b and 23a were magnetized with the same pole (N pole) on the side facing the attraction plate 19. The gap between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b was 0.73 mm. The size of the attraction plate 19 was 6.5 mm × 8.2 mm.

[0088] In the experiment 1, the relationship between the diagonal position of the suction plate 19 and the suction force acting on the suction plate 19 was as shown in FIG. 11. The diagonal position of the suction plate 19 means the position of the suction plate 19 in the direction of the solid arrow shown in FIG. 10A and FIG. 10B, with the midpoint C (see FIG. 9) of the sensor magnets 22a, 22b, 23a, and 23b as the reference position (diagonal position 0 mm). In FIG. 10A and FIG. 10B, the substantially rectangular frame 19a shown by the dashed line represents the suction plate 19 after movement. As shown in FIG. 11, it was found that the suction force acting on the suction plate 19 was increased in the example compared to the comparative example 1. This indicates that the movable frame 11 can be stably held by the rear fixing holding member 21 in the example compared to the comparative example 1.

[0089] Moreover, the relationship between the diagonal position of the suction plate 19 and the torque acting on the suction plate 19 in Experiment 1 was as shown in FIG. 12. In Experiment 1, the rotation moment with the center P1 of the suction plate 19 as the rotation axis was measured as the torque, as shown by the solid arrow in FIG. 13. As shown in FIG. 12, it was found that in the Example, the torque was the same as in Comparative Example 1 up to a diagonal position (amount of displacement) of the suction plate 19 of about 1 mm. This shows that, in Comparative Example 1, the torque increases when an attempt is made to obtain a suction force equivalent to that of the Example, whereas in the Example, the torque can be suppressed to a level comparable to that of the Comparative Example.

[0090] From the above results, it was confirmed that in the embodiment, it is possible to suppress the torque and improve the suction force at the same time, reduce the load on the actuator, and make the actuator smaller.

[0091] [1-6-2-2. Experiment 2] 14 to 16, Experiment 2 will be described below. In Experiment 2, the suction force and torque acting on the suction plate 19 when the suction plate 19 was moved were compared between the example and comparative examples 1 and 2.

[0092] Fig. 14 is a graph showing the relationship between the diagonal position of the suction plate 19 and the suction force in the direction of the optical axis AX acting on the suction plate 19 in Experiment 2. Fig. 15 is a graph showing the relationship between the diagonal position of the suction plate 19 and the torque acting on the suction plate 19 in Experiment 2. Fig. 16 is a diagram showing the measurement conditions for the torque in Experiment 2.

[0093] In Experiment 2, the experimental conditions of the embodiment and Comparative Example 1 are the same as those of Experiment 1. In Comparative Example 2, the gap between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b is narrower by 0.07 mm than in Comparative Example 1. The other experimental conditions of Comparative Example 2 are the same as those of Comparative Example 1.

[0094] The relationship between the diagonal position of the attraction plate 19 and the attraction force acting on the attraction plate 19 in Experiment 2 was as shown in Fig. 14. As shown in Fig. 14, in the example, as in Experiment 1, it was found that the attraction force acting on the attraction plate 19 was greater than in Comparative Examples 1 and 2. Also, in Comparative Example 2, it was found that the attraction force acting on the attraction plate 19 was increased by the amount that the gap between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b was narrowed by 0.07 mm compared to Comparative Example 1.

[0095] Moreover, the relationship between the diagonal position of the suction plate 19 and the torque acting on the suction plate 19 in Experiment 2 was as shown in Fig. 15. In Experiment 2, the rotation moment with the initial position P2 (midpoint C) of the suction plate 19 as the rotation axis was measured as the torque, as shown by the solid arrow in Fig. 16. As shown in Fig. 15, in the example, as in Experiment 1, it was found that the torque was closer to zero than in Comparative Examples 1 and 2 when the diagonal position (displacement) of the suction plate 19 was 1.5 mm or more.

[0096] From the above results, it was confirmed that in the embodiment, it is possible to suppress the torque and improve the suction force at the same time, reduce the load on the actuator, and make the actuator smaller.

[0097] In Comparative Example 2, if the gap between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b is narrowed too much in order to increase the attraction force acting on the attraction plate 19, the load on the actuator in the X and Y directions tends to increase. In contrast, in the embodiment, the attraction force acting on the attraction plate 19 can be increased without narrowing the gap between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b too much, so that the load on the actuator in the X and Y directions can be reduced.

[0098] [1-7. Movement restriction mechanism] Next, the configuration of the movement limiting mechanism will be described with reference to Fig. 4. As shown in Fig. 4, the movement limiting mechanism is composed of position limiting members 34a, 34b, and 34c attached to mounting member 33, and position limiting members 36a, 36b, and 36c attached to posts 35a, 35b, and 35c, respectively.

[0099] As described above, when the ball members 31a, 31b, and 31c come into contact with the respective standing walls 110d, 110e, and 110f of the rectangular ball holding parts 110a, 110b, and 110c due to the displacement of the imaging element 12, a friction load greater than the rolling load is generated. This friction load becomes a variable factor in the driving force of the actuator, making accurate image blur correction control difficult. In addition, when an unexpected impact or the like is applied, there is a risk that the ball members 31a, 31b, and 31c will climb over the respective standing walls 110d, 110e, and 110f and fall off.

[0100] 4, in this embodiment, in order to prevent abnormal noise from occurring when the movable frame 11 moves relative to the rear surface fixed holding member 21 and abuts against the mounting member 33 and the pillars 35a, 35b, 35c, position restriction members 34a, 34b, 34c are attached to the mounting member 33, and position restriction members 36a, 36b, 36c are attached to the pillars 35a, 35b, 35c, respectively. The movable frame 11 abuts against the mounting member 33 via the position restriction members 34a, 34b, 34c, and abuts against the pillars 35a, 35b, 35c via the position restriction members 36a, 36b, 36c.

[0101] Furthermore, by bringing the center of gravity of the movable frame 11 in the optical axis AX direction into contact with the position restriction members 34a, 34b, 34c, 36a, 36b, and 36c, it is possible to suppress the rotation moment and rotation in the yaw and pitch directions and to prevent the movable frame 11 from coming into contact with the rear fixed holding member 21 and the front fixed holding member 32. The position restriction members 34a, 34b, 34c, 36a, 36b, and 36c have cushioning properties and also play a role in absorbing shock.

[0102] [2. Operation] Next, the operation of the image blur correction device 1 according to this embodiment will be described. When the digital camera 100 captures an image, if the camera body 101 moves and the optical axis of the light from the subject deviates from the center of the image sensor 12, the magnetic displacement detection sensors 14a, 14b, and 14c detect the direction and amount of displacement of the image sensor 12 in the left-right, up-down, yaw, pitch, and roll directions. The detected direction and amount of displacement are measured by the circuit board 13, and the controller of the circuit board 13 supplies power to the drive coils 15, 16, and 17 in accordance with the measurement results.

[0103] At this time, the circuit board 13 supplies power to at least one of the drive coils 15, 16, and 17 in accordance with the measured amount and direction of displacement. This power supply changes the magnetic force on the corresponding drive magnets 25a, 25b, 25c, 25d, 27a, 27c, 26b, 26d, 27a, 27b, 27c, and 27d, displacing the movable frame 11 relative to the rear fixed holding member 21. As a result, the imaging element 12 fixed to the movable frame 11 is displaced in such a direction and by such an amount that image blur is corrected.

[0104] [3. Effects] The image blur correction device 1 according to this embodiment is an image sensor driving device for driving an image sensor 12. The image blur correction device 1 includes a rear fixed holding member 21, a movable frame 11 for holding the image sensor 12, the movable frame 11 facing the rear fixed holding member 21 in the optical axis AX direction and displaceable within a plane perpendicular to the optical axis AX direction relative to the rear fixed holding member 21, an attraction plate 19 provided on one of the rear fixed holding member 21 and the movable frame 11, and at least one sensor magnet 22a, 22b, 23a, 23b provided on the other of the rear fixed holding member 21 and the movable frame 11 and facing the attraction plate 19 in the optical axis AX direction. At least one of the sensor magnets 22a, 22b, 23a, 23b has, on the side facing the attraction plate 19, an S1 magnetized portion magnetized to an S pole, an N2 magnetized portion arranged adjacent to the S1 magnetized portion in the L1 direction and magnetized to an N pole, an S3 magnetized portion arranged adjacent to the N2 magnetized portion in the L2 direction intersecting with the L1 direction and magnetized to an S pole, and an N4 magnetized portion arranged adjacent to the S3 magnetized portion in the L3 direction intersecting with the L2 direction and adjacent to the S1 magnetized portion, magnetized to an N pole. When viewed from the optical axis AX direction, the attraction plate 19 overlaps at least a portion of the S1 magnetized portion, the N2 magnetized portion, the S3 magnetized portion, and the N4 magnetized portion.

[0105] This makes it possible to increase the attractive force between the attraction plate 19 and the sensor magnets 22a, 22b, 23a, and 23b while suppressing the rotational torque acting on the attraction plate 19. As a result, it is possible to reduce the load on the actuator, and it is possible to maintain a stable attractive force by the attraction plate 19 even when the imaging element 12 is displaced. Therefore, it is possible to drive the imaging element 12 stably.

[0106] In addition, in this embodiment, at least one of the sensor magnets 22a, 22b, 23a, 23b further has an N1 magnetized portion arranged opposite the S1 magnetized portion in the optical axis AX direction and magnetized to the N pole, an S2 magnetized portion arranged opposite the N2 magnetized portion in the optical axis AX direction and magnetized to the S pole, an N3 magnetized portion arranged opposite the S3 magnetized portion in the optical axis AX direction and magnetized to the N pole, and an S4 magnetized portion arranged opposite the N4 magnetized portion in the optical axis AX direction and magnetized to the S pole.

[0107] This makes it possible to increase the magnetic force in the direction of the optical axis AX, and therefore makes it possible to drive the image sensor 12 more stably even when the image sensor 12 is displaced.

[0108] Moreover, in this embodiment, a plurality of magnets are provided, and the plurality of magnets include a sensor magnet 22a having an S1 magnetized portion formed therein, a sensor magnet 22b having an N2 magnetized portion formed therein, a sensor magnet 23a having an S3 magnetized portion formed therein, and a sensor magnet 23b having an N4 magnetized portion formed therein.

[0109] This allows each of the sensor magnets 22a, 22b, 23a, and 23b to be configured with a magnet that is magnetized in one direction (NS magnetization). As a result, each of the sensor magnets 22a, 22b, 23a, and 23b can be configured inexpensively. In addition, since the arrangement intervals of the sensor magnets 22a, 22b, 23a, and 23b can be adjusted, the detection sensitivity of the magnetic displacement detection sensors 14a, 14b, and 14c can be easily adjusted compared to when the sensor magnets are configured with a single magnet.

[0110] In addition, in this embodiment, the image shake correction device 1 further includes magnetic displacement detection sensors 14a, 14b, 14c that detect displacement of the movable frame 11 relative to the rear fixed holding member 21 based on changes in magnetic flux of at least one sensor magnet 22a, 22b, 23a, 23b, and the magnetic displacement detection sensors 14a, 14b, 14c are provided on the other of the rear fixed holding member 21 and the movable frame 11 and face the at least one sensor magnet 22a, 22b, 23a, 23b in the direction of the optical axis AX.

[0111] This makes it possible to stably drive the imaging element 12 even when the imaging element 12 is displaced. As a result, the position to which the imaging element 12 has been displaced can be detected with high accuracy.

[0112] Moreover, in this embodiment, the image blur correction device 1 further includes an actuator that displaces the movable frame 11 relative to the rear fixed holding member 21. The magnetic displacement detection sensors 14a, 14b, and 14c detect the amount and direction of displacement of the movable frame 11 relative to the rear fixed holding member 21. The actuator displaces the movable frame 11 relative to the rear fixed holding member 21 based on the detected amount and direction of displacement of the movable frame 11.

[0113] This makes it possible to correct image blur caused by the movement of the camera body 101.

[0114] In this embodiment, the movable frame 11, the magnetic displacement detection sensors 14a, 14b, and 14c, the attraction plate 19, and the sensor magnets 22a, 22b, 23a, and 23b are arranged in this order along the optical axis AX.

[0115] This makes it possible to maintain a stable suction force by the suction plate 19 even when the imaging element 12 is displaced.

[0116] Moreover, in this embodiment, the image blur correction device 1 further includes ball members 31a, 31b, and 31c that support the movable frame 11 so that it can be displaced relative to the rear fixed holding member 21. The ball members 31a, 31b, and 31c are pressed against the movable frame 11 or the rear fixed holding member 21 by the attraction plate 19 being attracted to at least one of the sensor magnets 22a, 22b, 23a, and 23b.

[0117] This allows the ball members 31a, 31b, and 31c to be biased toward one side of the rear fixed holding member 21 and the movable frame 11.

[0118] Furthermore, in this embodiment, when the movable frame 11 is not displaced relative to the rear fixed holding member 21, the suction plate 19 is positioned so that the center of the suction plate 19 and the midpoint C of the S1 magnetized portion, the N2 magnetized portion, the S3 magnetized portion, and the N4 magnetized portion are aligned along the optical axis AX.

[0119] This allows the imaging element 12 to be stably attracted in the direction of the optical axis AX, making it easier to control the actuator when displacing the imaging element 12. As a result, the imaging element 12 can be displaced to the target position with higher accuracy.

[0120] In this embodiment, the cross section of the suction plate 19 perpendicular to the optical axis AX is formed in a circular or substantially polygonal shape.

[0121] This allows the imaging element 12 to be attracted in the optical axis AX direction more stably, making it easier to control the actuator when moving the imaging element 12. As a result, the imaging element can be displaced to the target position with higher accuracy.

[0122] Moreover, in this embodiment, the image blur correction device 1 further includes a movement limiting mechanism that limits the movement of the movable frame 11 relative to the rear fixed holding member 21.

[0123] This allows the imaging element 12 to be accurately displaced to the target position.

[0124] In the present embodiment, the movement limiting mechanism has position restriction members 34a, 34b, 34c, 36a, 36b, and 36c. The position restriction members 34a, 34b, 34c, 36a, 36b, and 36c are arranged to come into contact with the center of gravity of the movable frame 11 in the direction of the optical axis AX when the movable frame 11 comes into contact with the position restriction members 34a, 34b, 34c, 36a, 36b, and 36c.

[0125] This makes it possible to prevent the ball members 31a, 31b, and 31c from climbing over the standing walls 110d, 110e, and 110f and falling off when an unexpected impact or the like is applied.

[0126] Moreover, the digital camera 100 of this embodiment includes any one of the image shake correction devices 1 described above, and an image sensor 12 that converts an optical image of a subject into an electrical signal. The movable frame 11 holds the image sensor 12 displaceably relative to the rear fixed holding member 21.

[0127] This makes it possible to provide a digital camera 100 with a higher performance image blur correction function.

[0128] The digital camera 100 of this embodiment includes the image blur correction device 1 described above and a plurality of optical systems that collect light from a subject. The movable frame 11 holds at least one of the optical systems so that it can be displaced relative to the rear fixing holding member 21.

[0129] This makes it possible to provide a digital camera 100 with a higher performance image blur correction function.

[0130] Further, the manufacturing method of the image blur correction device 1 of the present embodiment is a manufacturing method of the image blur correction device 1 including the front fixed holding member 32 and the driving magnets 25c, 25d, 26d, 27c, and 27d fixed to the front fixed holding member 32. A manufacturing method of the image blur correction device 1 includes the steps of (a) placing the driving magnets 25c, 25d, 26d, 27c, and 27d on a base jig 600, (b) sucking the driving magnets 25c, 25d, 26d, 27c, and 27d toward the base jig 600 using a suction jig 500, (c) applying adhesive to one of the driving magnets 25c, 25d, 26d, 27c, and 27d and the front fixed holding member 32, and (d) installing the front fixed holding member 32 on the base jig 600, thereby fixing the driving magnets 25c, 25d, 26d, 27c, and 27d to the front fixed holding member 32 via the adhesive.

[0131] This allows the drive magnets 25c, 25d, 26d, 27c, and 27d to be fixed to the front fixed holding member 32 without drilling holes in the front fixed holding member 32, which is the yoke. Also, since there is no need to secure extra space in the front fixed holding member 32 for pouring adhesive into each corner of the drive magnets 25c, 25d, 26d, 27c, and 27d, the drive magnets 25c, 25d, 26d, 27c, and 27d can be arranged along the periphery of the front fixed holding member 32. As a result, the actuator can be made smaller while ensuring a large magnetic force by enlarging the drive magnets 25c, 25d, 26d, 27c, and 27d.

[0132] In the present embodiment, the suction jig 500 has suction magnets 525c, 525d, 526d, 527c, and 527d arranged at positions corresponding to the driving magnets 25c, 25d, 26d, 27c, and 27d placed on the base jig 600. In the above (b), the driving magnets 25c, 25d, 26d, 27c, and 27d are attracted toward the base jig 600 by the magnetic forces of the suction magnets 525c, 525d, 526d, 527c, and 527d of the suction jig 500.

[0133] This makes it possible to hold the drive magnets 25c, 25d, 26d, 27c, and 27d relative to the base jig 600 when the front fixed holding member 32 is placed on the base jig 600.

[0134] In this embodiment, the base jig 600 has positioning portions 601, 602, 603, and 604 for positioning the driving magnets 25c, 25d, 26d, 27c, and 27d. In the above (a), the driving magnets 25c, 25d, 26d, 27c, and 27d are placed on the base jig 600 so that the driving magnets 25c, 25d, 26d, 27c, and 27d are positioned relative to the base jig 600 by the positioning portions 601, 602, 603, and 604.

[0135] This allows the drive magnets 25c, 25d, 26d, 27c, and 27d to be positioned relative to the base jig 600 easily.

[0136] In this embodiment, the base jig 600 has position restriction pins 605a and 605b. The front fixed holding member 32 has position restriction holes 701a and 701b through which the position restriction pins 605a and 605b are inserted. In the above (d), the front fixed holding member 32 is installed on the base jig 600 so that the position restriction pins 605a and 605b are inserted into the position restriction holes 701a and 701b.

[0137] This makes it possible to easily position the front fixed holding member 32 relative to the base jig 600.

[0138] Moreover, the image blur correction device 1 of this embodiment is an image sensor driving device for driving the image sensor 12. It includes a front fixed holding member 32 having a fixing surface, and driving magnets 25c, 25d, 26d, 27c, and 27d used for driving the image sensor 12 and fixed to the fixing surface of the front fixed holding member 32 with an adhesive. The entire back surface of each of the driving magnets 25c, 25d, 26d, 27c, and 27d is in contact with the fixing surface of the front fixed holding member 32 with the adhesive.

[0139] This allows the drive magnets 25c, 25d, 26d, 27c, and 27d to be fixed to the front fixed holding member 32 without drilling holes in the front fixed holding member 32, which is the yoke. Also, since there is no need to secure extra space in the front fixed holding member 32 for pouring adhesive into each corner of the drive magnets 25c, 25d, 26d, 27c, and 27d, the drive magnets 25c, 25d, 26d, 27c, and 27d can be arranged along the periphery of the front fixed holding member 32. As a result, the actuator can be made smaller while ensuring a large magnetic force by enlarging the drive magnets 25c, 25d, 26d, 27c, and 27d.

[0140] (Variations, etc.) As described above, the embodiments have been described as examples of the technology disclosed in this application. However, the technology in this disclosure is not limited to these, and can be applied to embodiments in which modifications, substitutions, additions, omissions, etc. are appropriately made. In addition, it is also possible to combine the components described in each of the above embodiments to create a new embodiment.

[0141] Therefore, other embodiments will be exemplified below.

[0142] [1] In the above embodiment, the cross-sectional shape of the suction plate 19 is formed to be substantially rectangular, but is not limited to this. For example, the cross-sectional shape of the suction plate 19 may be formed to be circular or substantially polygonal.

[0143] [2] In the above embodiment, the configuration for stably sucking the image sensor 12 in the optical axis AX direction in the image blur correction device 1 has been described, but the idea of ​​the present disclosure is not limited to the image blur correction device 1. For example, the present disclosure may be applied to an imaging device disclosed in JP 2011-227578 A that drives an image sensor in a range smaller than the pixels of the image sensor to obtain image data with a higher resolution than the actual number of pixels of the image sensor. Alternatively, the present disclosure may be applied to an imaging device disclosed in JP 2010-73035 A that drives an image sensor in pixel units to obtain information on each color of RGB for each pixel to obtain high-definition image data.

[0144] [3] In the above embodiment, the sensor magnets 22a, 22b, 23a, 23b, 24a, and 24b are arranged on the rear fixed holding member 21, but the present invention is not limited to this and they may be arranged on the movable frame 11. In this case, the magnetic displacement detection sensors 14a, 14b, and 14c and the suction plate 19 are arranged on the rear fixed holding member 21.

[0145] [4] 1 and 2 has been given as an example of an imaging device in the above embodiment, but the imaging device is not limited to this. The imaging device may be, for example, a camera system capable of mounting an image stabilization device using either a sensor shift method or a lens shift method.

[0146] [5] In the above embodiment, the actuator is configured with the drive coils 15, 16, 17 and the three sets of six pairs of drive magnets, but this is not limiting and the actuator may be configured with, for example, a piezoelectric actuator.

[0147] [6] In the above embodiment, each of the magnetic displacement detection sensors 14a, 14b, and 14c is configured with a Hall element, but this is not limited to this and may be configured with a sensor that detects displacement from an integrated value using, for example, an angular velocity sensor or an acceleration sensor.

[0148] As described above, the embodiments have been described as examples of the technology in the present disclosure. For this purpose, the attached drawings and detailed description have been provided.

[0149] Therefore, among the components described in the attached drawings and detailed description, not only are there components essential for solving the problem, but there may also be components that are not essential for solving the problem in order to illustrate the above technology. Therefore, the fact that such non-essential components are described in the attached drawings or detailed description should not be interpreted as immediately indicating that such non-essential components are essential.

[0150] Furthermore, since the above-described embodiments are intended to illustrate the technology in the present disclosure, various modifications, substitutions, additions, omissions, and the like can be made within the scope of the claims or their equivalents. [Industrial Applicability]

[0151] The image sensor driving device disclosed herein has an image shake correction function and a pixel shift shooting function by driving the image sensor, and can be widely applied to electronic devices capable of capturing subject images (e.g., imaging devices such as digital cameras and camcorders, camera bodies, mobile phones, smartphones, etc.). [Explanation of symbols]

[0152] 1 Image stabilization device 10. Chassis 11 Movable frame 12 Image sensor 13 Circuit Board 14a, 14b, 14c Magnetic displacement detection sensor 15 Drive coil 16 Drive coil 17 Drive coil 18 Retaining member 19,19a Suction plate 20 Body Mount 20a opening 21 Rear fixing member 22a, 22b, 23a, 23b, 24a, 24b Sensor magnet 25a, 25b, 25c, 25d, 26b, 26d, 27a, 27b, 27c, 27d Drive magnet 28 Adhesive 29 Sensor magnet yoke plate 30 Shutter button 31a, 31b, 31c Ball members 32 Front fixed retaining member 33 Mounting material 34a, 34b, 34c, 36a, 36b, 36c Position control members 35a,35b,35c pillar 40 Hot Shoe 50 Flash unit 60 Electronic Viewfinder 70 Display device 100 Digital Camera 101 Camera body 110a, 110b, 110c ball holding portion 110d, 110e, 110f Standing wall 111a,111b,111c Metal plate 200 Lens unit 201 Lens mount 202 Focus ring 203 Zoom Ring 500 Suction tool 525c,525d,526d,527c,527d Attraction magnet 600 Base jig 601,602,603,604 Positioning part 605a, 605b Position control pin 701a,701b Position regulation hole AX optical axis S1 front S2 top S3 rear S4 bottom

Claims

1. An imaging element driving device for driving an imaging element, a yoke having a fixed surface; a magnet used for driving the imaging element, the magnet being disposed along a peripheral portion of the yoke and fixed to the fixed surface of the yoke; A plurality of the magnets are provided, Each of the plurality of magnets is formed in a rectangular shape having long sides and short sides, a side surface of the long side of a certain portion of the magnets that is approximately perpendicular to the fixed surface has a specific positional relationship in which the side surface is located on the same plane as a side surface at the peripheral portion of the yoke, and a side surface of the long side of another portion of the magnets that is approximately perpendicular to the fixed surface has a specific positional relationship in which the side surfaces are located outwardly from the side surface at the peripheral portion of the yoke, Among the side surfaces of the magnets other than the part of the magnets among the plurality of magnets, the side surfaces of the long sides that are approximately perpendicular to the fixed surface do not have the specific positional relationship. Image sensor driving device.

2. A region of the back surface of each of the plurality of magnets that overlaps with the fixed surface of the yoke in a plan view is in contact with the fixed surface of the yoke via an adhesive. The imaging device driving device according to claim 1 .

3. The plurality of magnets are disposed adjacent to one another on the fixed surface of the yoke, A side surface of each of the plurality of magnets that is substantially perpendicular to the fixed surface is exposed to the outside along the peripheral portion of the yoke, except for a side surface facing the other magnet adjacent to the magnet.

3. The imaging device driving device according to claim 1.

4. The yoke and the magnets are provided in pairs, The pair of magnets is fixed to the fixed surface of each of the pair of yokes, The fixing surfaces of the pair of yokes are disposed opposite to each other, The pair of magnets overlap each other in a plan view.

4. The imaging device driving device according to claim 1.

5. The area of ​​the yoke in a plan view is larger than the area of ​​each of the plurality of magnets in a plan view.

5. The imaging device driving device according to claim 1.

Images