Optical element driving device, camera device, and electronic device

Abstract

The present application provides an optical element driving device, a camera device, and an electronic device that can reduce the cause of an error in rotation around one rotation axis in the detection value of the amount of displacement in rotation around the other rotation axis in the case of performing rotational driving of a movable portion around two rotation axes. A first detection portion of a prism driving device (3) has a first magnet (201) disposed in a third member (60) and a first Hall element (27) disposed in an FPC (20) opposite the first magnet (201), and detects the displacement in rotation of the third member (60) around a first rotation axis (101). A second detection portion has a second magnet (202a) disposed in the third member (60) and a second Hall element (25) disposed in the FPC (20), and detects the displacement in rotation of the third member (60) around a second rotation axis (102). The second magnet (202a) has a cross-sectional shape sandwiched by circular arc edges (202p and 202q) of two concentric circles centered on the first rotation axis (101).

Description

TECHNICAL FIELD

[0001] The present application relates to an optical element driving device, a camera device, and an electronic device for an electronic device such as a smartphone. BACKGROUND

[0002] Among camera devices mounted on electronic devices such as smartphones, a lens body and a prism are disposed on an optical path from a photographic subject to an image sensor, and the prism is tilted around two axes of an orthogonal coordinate system composed of three axes orthogonal to each other. As a document disclosing a technology related to such a camera device, there is Patent Literature 1. The OPFE (Optical Path Folding Element) driving device disclosed in Patent Literature 1 has a fixed subassembly fixed to a frame, a top driving subassembly, and a bottom driving subassembly. The top driving subassembly rotates around a pitch axis with respect to the fixed subassembly in conjunction with the OPFE. The bottom driving subassembly rotates around a yaw axis orthogonal to the pitch axis with respect to the fixed subassembly in conjunction with the OPFE. In order to control the rotation around the pitch axis of the OPFE and the rotation around the yaw axis, the driving device of Patent Literature 1 is provided with a first sensor that detects the rotational displacement around the yaw axis and a second sensor that detects the rotational displacement around the pitch axis. The first sensor is composed of a magnet disposed on the top driving subassembly and a magnetic sensor disposed on the fixed subassembly. The second sensor is composed of a magnet disposed on the bottom driving subassembly and a magnetic sensor disposed on the fixed subassembly.

[0003] PRIOR ART DOCUMENTS

[0004] PATENT LITERATURE

[0005] Patent Literature 1: U.S. Patent Application Publication No. 2021 / 0048650 SUMMARY

[0006] (PROBLEMS TO BE SOLVED BY THE INVENTION)

[0007] However, the technology of Patent Literature 1 has a problem that, in a case where the rotational drive around the yaw axis and the rotational drive around the pitch axis are performed at the same time, the relative positional relationship between the magnet and the magnetic sensor that constitute the second sensor for detecting the rotation around the pitch axis changes due to the rotation around the yaw axis, and thus an error occurs in the detection of the rotational displacement.

[0008] The present application is conceived in view of such a problem, and aims to provide an optical element driving device, a camera device, and an electronic device that can reduce an error caused by the rotation around one rotation axis with respect to the detection value of the rotational displacement amount around the other rotation axis in a case where the rotational drive around both rotation axes of a movable portion is performed.

[0009] (Means for solving the problems)

[0010] To solve the above problems, an optical element driving device according to an embodiment of the present application includes: a fixed portion; a movable portion having a placement portion on which an optical element is placed, and being rotatable relative to the fixed portion about a first rotation axis and about a second rotation axis orthogonal to a plane including the first rotation axis; a first driving portion that supplies a rotational driving force about the first rotation axis to the movable portion; a second driving portion that supplies a rotational driving force about the second rotation axis to the movable portion; a first detection portion that includes a first magnet provided on the movable portion and a first magnetic sensor provided on the fixed portion so as to face the first magnet, and detects a rotational displacement of the movable portion about the first rotation axis; and a second detection portion that includes a second magnet provided on the movable portion and a second magnetic sensor provided on the fixed portion so as to face the second magnet, and detects a rotational displacement of the movable portion about the second rotation axis, the second magnet having a cross-sectional shape sandwiched by arc edges of two concentric circles centered on the first rotation axis.

[0011] In this embodiment, the second magnetic sensor can be provided at a center of the arc edges of the two concentric circles when viewed in an axial direction of the first rotation axis.

[0012] In addition, the first magnet can have a cross-sectional shape sandwiched by arc edges of two concentric circles centered on the second rotation axis.

[0013] In addition, the first driving portion can include the first magnet and a first coil provided on the fixed portion so as to face the first magnet, and the second driving portion can include the second magnet and a second coil provided on the fixed portion so as to face the second magnet.

[0014] In addition, an intermediate member can be provided to support the movable portion so as to be rotatable relative to the fixed portion about the first rotation axis and about the second rotation axis.

[0015] A camera device according to another embodiment of the present application includes the above-described optical element driving device.

[0016] An electronic apparatus according to still another embodiment of the present application includes the above-described camera device.

[0017] (EFFECTS OF THE INVENTION)

[0018] The optical element driving device according to the present application includes: a fixed portion; a movable portion having a placement portion on which an optical element is placed, and being rotatable relative to the fixed portion about a first rotation axis and about a second rotation axis orthogonal to a plane including the first rotation axis; a first driving portion that supplies a rotation driving force about the first rotation axis to the movable portion; a second driving portion that supplies a rotation driving force about the second rotation axis to the movable portion; a first detection portion that includes a first magnet provided on the movable portion and a first magnetic sensor provided on the fixed portion so as to face the first magnet, and that detects a rotation displacement of the movable portion about the first rotation axis; and a second detection portion that includes a second magnet provided on the movable portion and a second magnetic sensor provided on the fixed portion so as to face the second magnet, and that detects a rotation displacement of the movable portion about the second rotation axis, the second magnet having a cross-sectional shape sandwiched by arc edges of two concentric circles centered on the first rotation axis. Thus, even if the second magnet rotates about the first rotation axis, the positional relationship between the arc edges of the two concentric circles and the second magnetic sensor does not change. Therefore, an optical element driving device, a camera device, and an electronic device that can reduce an error in the detection value of the rotation displacement about the second rotation axis due to rotation about the first rotation axis when rotation driving of the movable portion about the two rotation axes is performed can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a front view of an electronic device, namely, a smartphone 9, equipped with a camera device 8 including a prism driving device 3 that is one embodiment of the optical element driving device of the present application.

[0020] Figure 2 is a perspective view of the prism driving device 3 of Figure 1

[0021] Figure 3 is an exploded view of the prism driving device 3 of Figure 2

[0022] Figure 4 is a side view showing the relationship between the first rotation axis 101 and the second magnet 202a of the prism driving device 3 of Figure 3 DETAILED DESCRIPTION

[0023] Hereinafter, one embodiment of the present application will be described with reference to the drawings. As shown in Figure 1

[0024] ​​​​The camera device 8 has: the prism 2 and the lens body 6 as optical members; the image sensor 7 that photoelectrically converts light guided from a photographic subject via the prism 2 and the lens body 6; and an optical element drive device, i.e., the prism drive device 3, that drives the prism 2. Light incident on the prism 2 from the photographic subject is bent in the prism 2, transmitted through the lens body 6, and incident on the image sensor 7. Further, the camera device 8 includes a lens drive device that drives the lens body 6 in the direction of the optical axis thereof, but the illustration thereof is omitted.

[0025] Hereinafter, the structure of the present embodiment will be described with the orthogonal coordinate system composed of the X-axis, the Y-axis, and the Z-axis orthogonal to each other being set. The X-axis is the axis through the optical axis of the lens body 6. The X-axis and the Y-axis are axes orthogonal to each other and to the Z-axis. Light from the photographic subject is incident on the prism 2 from the Z-axis direction, bent at a right angle by the prism 2, advances in the X-axis direction, and passes through the lens body 6. Hereinafter, in the Z-axis direction, the side having the prism 2 viewed from the lens body 6 is called the -X side, and the side having the image sensor 7 viewed from the prism 2 is called the +X side. In addition, in the Z-axis direction, the side having the photographic subject viewed from the prism 2 is called the +Z side, and the opposite side is called the -Z side.

[0026] The optical member drive device of the present embodiment is the prism drive device 3, and has a fixed portion, a movable portion, a first drive portion, a second drive portion, a first detection portion, and a second detection portion. The movable portion is rotatable about a first rotation axis 101 with respect to the fixed portion and is rotatable about a second rotation axis 102 orthogonal to a plane including the first rotation axis 101, and has a placement stage 61 on which the prism 2 as an optical element is placed. The first drive portion provides the movable portion with a rotational drive force about the first rotation axis 101, and the second drive portion provides the movable portion with a rotational drive force about the second rotation axis 102. The first detection portion has a first magnet 201 disposed on the movable portion and a first magnetic sensor, i.e., a first Hall element 27, disposed on the fixed portion opposite the first magnet 201, and detects a rotational displacement of the movable portion about the first rotation axis 101. The second detection portion has a second magnet 202a, 202b disposed on the movable portion and a second magnetic sensor, i.e., a second Hall element 25, disposed on the fixed portion opposite the second magnet 202a, and detects a rotational displacement of the movable portion about the second rotation axis 102.

[0027] As shown in Figs. 1 and 2, the prism drive device 3 has a housing 10, a base plate 30, a first drive coil 31, a second drive coil 32, a first magnet 201, a second magnet 202a, 202b, a first Hall element 27, and a second Hall element 25. Figure 2 Figure 3 As shown in Figs. 1 and 2, the housing 10 of the prism drive device 3 constitutes the fixed portion, and has a hollow rectangular parallelepiped shape. A rectangular notch portion 10z is provided on the +Z side surface of the housing 10, and a notch portion 10x is provided on the +X side surface. The notch portion 10z and the notch portion 10x are continuous. The base plate 30 is a flat plate-shaped member constituting the fixed portion, and a housing space is formed between the base plate 30 and the housing 10 by mounting the housing 10 on the +Z side of the base plate 30.

[0028] ​The prism 2 is accommodated in the accommodation space. The prism 2 has an incident surface 2z, an exit surface 2x, and a reflection surface 2r that are orthogonal to each other. The prism 2 exposes the exit surface 2x to the notch portion 10x and exposes the incident surface 2z to the notch portion 10z. Light from the photographed object is incident on the incident surface 2z from the +Z side, is bent at a right angle in the reflection surface 2r, and advances toward the lens body 6 from the exit surface 2x toward the +X side. The prism driving device 3 has a function of rotationally driving the prism 2 around a first rotation axis 101 parallel to the Y axis and rotationally driving it around a second rotation axis 102 parallel to the Z axis. The camera device 8 provided with the prism driving device 3 controls the direction of the exit light from the prism 2 by such rotational driving of the prism 2, thereby realizing a shake correction function.

[0029] An FPC (Flexible Printed Circuits) 20 is arranged in the accommodation space between the housing 10 and the bottom plate 30, and the portion connected to the outside extends from the gap between the housing 10 and the bottom plate 30 to the -Y side and is exposed to the outside. Electrodes of the FPC 20 are arranged in this exposed portion, and an electrical signal for controlling the rotational driving of the prism 2 is supplied from a control device not shown to the FPC 20.

[0030] As Figure 3 shown, the FPC 20 has a planar portion 21 parallel to the X axis and the Y axis, and side wall portions 22a, 22b, and 23 that stand up from the planar portion 21 toward the +Z side and are bent in a "匚" shape. A second coil 24a having a straight portion in the Z-axis direction is arranged on the +Y side surface of the side wall portion 22a on the -Y side, and a second Hall element 25 is arranged inside the winding of the second coil 24a. In addition, a second coil 24b having a straight portion in the Z-axis direction is arranged on the -Y side surface of the side wall portion 22b on the +Y side. In addition, a first coil 26 having a straight portion in the Y-axis direction is arranged on the +X side surface of the side wall portion 23 on the -X side, and a Hall element 27 is arranged inside the winding of the first coil 26. In the present embodiment, the first coil 26 has a function of generating a rotational driving force around the first rotation axis 101, and the second coils 24a and 24b have a function of generating a rotational driving force around the second rotation axis 102.

[0031] In the FPC 20, the inner surfaces of the side wall portions 22a, 22b, and 23 are fixed to the outer surfaces of the first member 40. The first member 40 constitutes a fixed portion and is fixed to the base plate 30. The first member 40 has a lower plate portion 41a on the -Z side and an upper plate portion 41b on the +Z side, a side wall portion 42a on the -Y side and a side wall portion 42b on the +Y side, and a side wall portion 42c on the -X side. Through-holes 122a and 122b are formed in the Y-axis direction center of the lower plate portion 41a and the upper plate portion 41b. Further, through-holes 43a and 43b are formed in a portion of the -X side of the side wall portions 42a and 42b, respectively. Further, a through-hole 43c is formed in the center of the side wall portion 42c. In a state where the first member 40 fixes the FPC 20, the through-hole 43a accommodates the second coil 24a and the second Hall element 25, the through-hole 43b accommodates the second coil 24b, and the through-hole 43c accommodates the first coil 26 and the first Hall element 27.

[0032] The second member 50 constituting the intermediate member and the third member 60 constituting the movable portion are accommodated in the first member 40. The third member 60 has side wall portions 62a, 62b, and 62c disposed in a manner of facing the side wall portions 42a, 42b, and 42c of the first member 40 from the inside. The third member 60 also has a placement stage 61 on which the reflecting surface 2r of the prism 2 is placed, the placement stage 61 being disposed between the side wall portion 62a and the side wall portion 62b and being inclined by 45 degrees with respect to the X axis and the Z axis. The side surface of the prism 2 is fixed to the side wall portions 62a and 62b, and the placement stage 61, the side wall portion 62a, and the side wall portion 62b constitute a placement portion on which the prism 2 is placed. There is a hollow region 65 capable of accommodating the second member 50 in the space between the placement stage 61 and the side wall portion 63. The side wall portion 62a on the -Y side of the third member 60 and the side wall portion 62b on the +Y side are formed with through-holes 121a and 121b that communicate with the hollow region 65.

[0033] Further, in the third member 60, a first magnet 201 of a rectangular shape longer in the Y-axis direction is disposed on the outer side of the side wall portion 63 on the -X side. The first magnet 201 is magnetized in the X-axis direction, and the magnet piece on the +Z side and the magnet piece on the -Z side are magnetized in opposite directions. Further, in the outer side of the side wall portions 62a and 62b of the third member 60, magnet holders 64a and 64b are provided in the -X side region, and a second magnet 202a and a second magnet 202b are disposed in these magnet holders 64a and 64b, respectively. The second magnets 202a and 202b have a cross-sectional shape sandwiched by circular arc edges 202p and 202q of two concentric circles, respectively. Further, details of the second magnets 202a and 202b will be described later.

[0034] The second member 50 is supported in the first member 40 as a fixed portion in a manner that the third member 60 as a movable portion is rotatable around the first rotation axis 101 and is rotatable around the second rotation axis 102. The second member 50 has a through-hole 51 that penetrates the second member 50 in the Y-axis direction and a through-hole 52 that penetrates in the Z-axis direction. The through-hole 52 has a central axis orthogonal to a plane that includes the central axis of the through-hole 51, and the through-holes 51 and 52 are in a position not intersecting each other.

[0035] The first rotation axis 101 parallel to the Y-axis is inserted and fixed in the through-hole 51. Both ends of the first rotation axis 101 are fitted into central holes of bearings 111a and 111b inserted and fixed in through-holes 121a and 121b of the third member 60. In addition, the second rotation axis 102 parallel to the Z-axis is inserted and fixed in the through-hole 52. Both ends of the second rotation axis 102 are fitted into central holes of bearings 112a and 112b inserted and fixed in through-holes 122a and 122b of the first member 40.

[0036] The third member 60 as a movable portion is rotatable around the first rotation axis 101 parallel to the Y-axis and is rotatable around the second rotation axis 102 parallel to the Z-axis in a state of being accommodated in the first member 40 as a fixed portion together with the second member 50. Further, the first coil 26 of the FPC 20 fixed to the first member 40 as a fixed portion is opposed to the first magnet 201 of the third member 60 as a movable portion, and functions as a first driving portion. That is, an electromagnetic force is generated by the first magnet 201 and the first coil 26, and functions as a rotational driving force for rotating the third member 60 as a movable portion around the first rotation axis 101. In addition, the second coils 24a and 24b of the FPC 20 fixed to the first member 40 are opposed to the second magnets 202a and 202b of the third member 60 as a movable portion, and functions as a second driving portion. That is, an electromagnetic force is generated by the second magnets 202a and 202b and the second coils 24a and 24b, and functions as a rotational driving force for rotating the third member 60 as a movable portion together with the second member 50 as an intermediate member around the second rotation axis 102.

[0037] A plate spring 71 is provided between the second member 50 and the third member 60, and generates a force tending to return to the origin with respect to rotation around the first rotation axis 101. Plate springs 72a and 72b are provided between the first member 40 and the second member 50, respectively, and generate a force tending to return to the origin with respect to rotation around the second rotation axis 102.

[0038] In order to control the rotation drive of the third component 60, namely the prism 2, around the first rotation axis 101 and the rotation drive around the second rotation axis 102, the prism drive device 3 is provided with a first detection unit for detecting the rotational displacement around the first rotation axis 101 and a second detection unit for detecting the rotational displacement around the second rotation axis 102.

[0039] More specifically, in this embodiment, a first Hall element 27, serving as a first magnetic sensor, disposed on the FPC 20 mounted on the first member 40, and a first magnet 201 disposed on the third member 60, constitute a first detection unit for detecting rotational displacement around the first rotation axis 101. When the third member 60 rotates around the first rotation axis 101, the first magnet 201 moves substantially along the Z-axis direction. The first Hall element 27, serving as the first magnetic sensor, detects the rotational displacement of the third member 60 around the first rotation axis 101 based on the change in the magnetic field supplied by the first magnet 201.

[0040] Furthermore, in this embodiment, the second Hall element 25, which serves as a second magnetic sensor, is disposed on the FPC 20 mounted on the first member 40, and the second magnet 202a is disposed on the third member 60, constituting a second detection unit for detecting rotational displacement around the second rotation axis 102. When the third member 60 rotates around the second rotation axis 102, the second magnet 202a moves substantially along the X-axis direction. The second Hall element 25, serving as the second magnetic sensor, detects the rotational displacement of the third member 60 around the second rotation axis 102 based on the change in the magnetic field supplied by the second magnet 202a.

[0041] Next, the details of the second magnet 202a will be explained. For example... Figure 4 As shown, in this embodiment, the second magnet 202a has a cross-sectional shape that is held between the inner arcuate edge 202p and the outer arcuate edge 202q of two concentric circles centered at the center 101c of the first rotation axis 101. The second magnet 202a is magnetized along the Y-axis, with the magnetization direction reversed by an arcuate magnetization reversal line 202r passing through the exact midpoint between the arcuate edges 202p and 202q. Viewed from the axial direction of the first rotation axis 101, the second Hall element 25 is disposed on the central core line 202r. In this embodiment, although the illustration is omitted, the second magnet 202b has the same structure as the second magnet 202a.

[0042] The reason for this configuration of the second magnet 202a is as follows. Assume that the cross-sectional shape of the second magnet 202a is rectangular. In this case, the magnetization reversal line 202r also becomes linear. When the third member 60 rotates around the first rotation axis 101, the magnetization reversal line 202r will deviate from the position facing the second Hall element 25. Therefore, even in the case where there is no change in the rotational displacement around the second rotation axis 102, the magnetic field strength detected by the second Hall element 25 changes due to rotation around the first rotation axis 101. In the case where the cross-sectional shape of the second magnet 202a is thus made rectangular, if the third member 60 rotates around the first rotation axis 101, there is a problem that an error occurs in the detected value of the rotational displacement around the second rotation axis 102 due to the influence thereof.

[0043] Therefore, in the present embodiment, the cross-sectional shape of the second magnet 202a is a shape in which the inner side is sandwiched by the circular arc side 202p and the outer side is sandwiched by the circular arc side 202q of two concentric circles having the center 101c of the first rotation axis 101 as the center. Since the magnetization reversal line 202r becomes a circular arc shape having the center 101c of the first rotation axis 101 as the center, even if the third member 60 rotates around the first rotation axis 101, the second Hall element 25 will be on the magnetization reversal line 202r, and the change in the magnetic field strength detected by the Hall element 25 is small. Thus, according to the present embodiment, in the case where rotational driving around the first rotation axis 101 and rotational driving around the second rotation axis 102 are performed, it is possible to reduce the error caused by the rotational displacement around the first rotation axis 101 in the detected value of the rotational displacement around the second rotation axis 102.

[0044] In the present embodiment, in the case where the prism 2 is caused to rotate around the first rotation axis 101, a control device not shown causes a current having a polarity corresponding to the desired direction of rotation around the first rotation axis 101 and a magnitude corresponding to the desired rotational displacement to flow into the first coil 26 via the FPC 20. In the case where the prism 2 is caused to rotate around the second rotation axis 102, the control device causes a current having a polarity corresponding to the desired direction of rotation around the second rotation axis 102 and a magnitude corresponding to the desired rotational displacement to flow into the second coils 24a and 24b via the FPC 20.

[0045] If a current flows through the first coil 26, an electromagnetic force in the Z-axis direction is generated due to the magnetic field of the first magnet 201, and the third member 60 as the movable portion rotates around the first rotation axis 101. In addition, if a current flows through the second coils 24a and 24b, an electromagnetic force in the X-axis direction is generated due to the magnetic fields of the second magnets 202a and 202b, and the third member 60 as the movable portion rotates around the second rotation axis 102.

[0046] At this time, the first Hall element 27 as the first magnetic sensor detects the rotational displacement of the third member 60 around the first rotation axis 101 based on the change in the magnetic field received from the first magnet 201. In addition, the second Hall element 25 as the second magnetic sensor detects the rotational displacement of the third member 60 around the second rotation axis 102 based on the change in the magnetic field received from the second magnet 202a. A control device not shown adjusts the current flowing through the first coil 26 and the currents flowing through the second coils 24a and 24b based on the detected values of these rotational displacements, and performs the rotational control around the first rotation axis 101 and the rotational control around the second rotation axis 102.

[0047] The above is a detailed description of the structure of the embodiment of the present application. The prism driving device 3 in the present embodiment as an optical element driving device is provided with a fixed portion, a movable portion, a first driving portion, a second driving portion, a first detecting portion, and a second detecting portion. The fixed portion includes the first member 40 and the FPC 20 mounted to the first member 40. The third member 60 as the movable portion has a placement stage 61 on which the prism 2 as an optical element is placed, and is rotatable around the first rotation axis 101 and rotatable around the second rotation axis 102 orthogonal to the plane including the first rotation axis 101 with respect to the first member 40. The first driving portion provides the third member 60 with a rotational driving force around the first rotation axis 101, and the second driving portion provides the third member 60 with a rotational driving force around the second rotation axis 102. The first detecting portion has the first magnet 201 disposed on the third member 60 and the first Hall element 27 as the first magnetic sensor disposed on the FPC 20 opposite the first magnet 201, and detects the rotational displacement of the third member 60 around the first rotation axis 101. The second detecting portion has the second magnet 202a disposed on the third member 60 and the second Hall element 25 as the second magnetic sensor disposed on the FPC 20, and detects the rotational displacement of the third member 60 around the second rotation axis 102. Also, the second magnet 202a has a cross-sectional shape sandwiched by the circular arc edges 202p and 202q of two concentric circles centered on the first rotation axis 101. Thus, even if the second magnet 202a rotates around the first rotation axis 101, the positional relationship of the circular arc edges 202p and 202q of the two concentric circles with the second Hall element 25 does not change. Therefore, according to the present embodiment, in the case where the rotational driving of the first rotation axis 101 and the rotational driving around the second rotation axis 102 are performed, it is possible to reduce the error due to the rotation around the first rotation axis 101 added to the detected value of the rotational displacement amount around the second rotation axis 102.

[0048] Further, the second magnet 202b, which is not opposed to the second Hall element 25 as the second magnetic sensor, can also have a rectangular cross-sectional shape. In addition, in addition to the second magnets 202a and 202b having the above-described structure, the first magnet 201 can also have a cross-sectional shape sandwiched by circular arc edges of two concentric circles centered on the second rotation axis 102. According to this, in the case of performing rotational drive around the first rotation axis 101 and rotational drive around the second rotation axis 102, it is possible to reduce the error due to rotation around the second rotation axis 102 added to the detection value of the rotational displacement around the first rotation axis 101.

[0049] (Explanation of Reference Numerals)

[0050] 2 prism; 2x, 2z, 2r incident surface, exit surface, reflection surface; 3 prism drive device; 6 lens body; 7 image sensor; 8 camera device; 9 smartphone; 10 housing; 10x, 10z notch portion; 20 FPC; 21 flat portion; 22a, 23, 22b, 42a, 42b, 42c, 62a, 62b, 63 side wall portion; 26 first coil; 24a, 24b second coil; 25 second Hall element; 27 first Hall element; 30 bottom plate; 40 first member; 41a upper plate portion; 41b lower plate portion; 43a, 43b, 43c, 121a, 121b, 122a, 122b through hole; 50 second member; 51, 52 through hole; 60 third member; 61 placement stage; 64a, 64b magnet holder; 65 hollow region; 71, 72a, 72b plate spring; 101 first rotation axis; 101c center; 102 second rotation axis; 111a, 111b, 112a, 112b bearing; 201 first magnet; 202a, 202b second magnet; 202p, 202q circular arc edge; 202r magnetization reversal line.

Claims

1. An optical element driving device characterized by comprising: Possessing: a fixed portion; a movable portion having a mount portion that mounts an optical element, and being rotatable relative to the fixed portion about a first rotation axis and being rotatable about a second rotation axis orthogonal to a plane that includes the first rotation axis; a first drive portion that supplies a rotational drive force about the first rotation axis to the movable portion; a second drive portion that supplies a rotational drive force about the second rotation axis to the movable portion; a first detection portion that includes a first magnet disposed in the movable portion and a first magnetic sensor disposed in the fixed portion opposite the first magnet, and that detects a rotational displacement of the movable portion about the first rotation axis; and a second detection portion that includes a second magnet disposed in the movable portion and a second magnetic sensor disposed in the fixed portion opposite the second magnet, and that detects a rotational displacement of the movable portion about the second rotation axis, the second magnet has a cross-sectional shape that is sandwiched by arc edges of two concentric circles centered on the first rotation axis.

2. The optical element drive device according to claim 1, wherein when viewed from the axial direction of the first rotation axis, the second magnetic sensor is disposed midway between the arc edges of the two concentric circles.

3. The optical element drive device according to claim 1, wherein the first magnet has a cross-sectional shape that is sandwiched by arc edges of two concentric circles centered on the second rotation axis.

4. The optical element drive device according to claim 1, wherein the first drive portion has the first magnet and a first coil disposed in the fixed portion opposite the first magnet, the second drive portion has the second magnet and a second coil disposed in the fixed portion opposite the second magnet.

5. The optical element drive device according to claim 1, wherein an intermediate member is provided to support the movable portion so as to be rotatable relative to the fixed portion about the first rotation axis and to be rotatable about the second rotation axis.

6. A camera device provided with the optical element drive device according to any one of claims 1 to 5.

7. An electronic apparatus provided with the camera device according to claim 6. ​

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