Electromagnetic driving device, lens driving device, photographic device and electronic equipment

Abstract

The present invention provides an electromagnetic drive device, a lens drive device, and a photographic device and an electronic device equipped with the lens drive device, wherein the electromagnetic force generated in the coil is large and the magnetic field leaking to the outside is small. The electromagnetic drive device comprises a coil 22 and a magnet group 18 arranged facing the coil 22, the magnet group 18 comprises a first magnet 68 and a second magnet 70, 70, the first magnet 68 is magnetized in one direction and has a first magnetized surface 72 opposite to the coil 22 and a first side surface 74, 74 formed in a direction intersecting with the first magnetized surface 72, the second magnet 70, 70 is magnetized in a direction intersecting with the magnetization direction of the first magnet and has a second magnetized surface 76, 76 in contact with the first side surface 74, 74 of the first magnet 68, and the second magnetized surface 76, 76 and the first magnetized surface 72 are magnetized to the same magnetic pole.

Description

[Technical field]

[0001] The present invention relates to an electromagnetic driving device, a lens driving device, and a camera device and an electronic device equipped with the lens driving device. [Background technology]

[0002] Conventional electromagnetic drive devices may use a coil and a magnet group. A known magnet group structure is one in which a soft magnetic material facing a coil is sandwiched between magnets (eg, Patent Document 1).

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2011-521285 (WO2009 / 139543). [Summary of the invention]

[0006] [Technical Problems to be Solved by the Invention]

[0007] A problem with conventional electromagnetic drive devices is that, although the electromagnetic force generated in the coil is large, a large magnetic field leaks to the outside from the surface on the opposite side of the coil.

[0008] The object of the present invention is to solve the above-mentioned conventional problems and to provide an electromagnetic driving device and a lens driving device in which the electromagnetic force generated in the coil is large and the magnetic field leaking to the outside is small, as well as a camera device and an electronic device equipped with the lens driving device.

[0009]

Technical solution

[0010] One form of the present invention is an electromagnetic drive device, comprising a coil and a magnet group arranged facing the coil, the magnet group comprising a first magnet and a second magnet, the first magnet being magnetized in one direction and comprising a first magnetized surface opposite to the coil and a first side surface formed in a direction intersecting with the first magnetized surface, the second magnet being magnetized in a direction intersecting with the magnetization direction of the first magnet and comprising a second magnetized surface in contact with the first side surface of the first magnet, the second magnetized surface being magnetized to the same magnetic pole as the first magnetized surface.

[0011] Preferably, the length of the second magnet in the direction in which the first side surface of the first magnet contacts the second magnetized surface of the second magnet is shorter than the length of the first magnet in the same direction.

[0012] Furthermore, preferably, the first magnet has two first side surfaces formed on opposite sides sandwiching the first magnetized surface, and the two second magnets are in contact with the two first side surfaces, respectively.

[0013] Furthermore, preferably, the coil is wound in a first direction from one side of the second magnet to the other side of the second magnet.

[0014] In addition, there are two magnet groups, the first magnetization surfaces and the second magnetization surfaces of the two magnet groups are adjacent to each other and formed on approximately the same plane, and are magnetized to opposite poles. In the coil, the current flowing in the first direction along one of the first magnetization surfaces and the current flowing in the first direction along the other of the first magnetization surfaces may be in opposite directions.

[0015] In this case, the coil may include two coil main bodies that face the two first magnetized surfaces and are formed parallel to the first direction, and connecting parts that connect ends of the two coil main bodies to each other.

[0016] Furthermore, preferably, the coil is wound along a boundary between the first magnet and the second magnet, and a current flowing to the coil wound along one of the boundaries and a current flowing to the coil wound along the other boundary are in opposite directions.

[0017] In this case, preferably, the coil includes two coil main body portions formed along the two boundaries, respectively, and connection portions connecting end portions of the two coil main body portions to each other.

[0018] Furthermore, a yoke may be provided on the counter-coil side surfaces of the first magnet and the second magnet.

[0019] Another form of the present invention is a lens driving device, which includes a coil extending in a tangent direction of an imaginary circle centered on the lens optical axis and a magnet group arranged facing the coil, the magnet group including a first magnet and a second magnet, the first magnet being magnetized along a radial direction of the imaginary circle and including a first magnetized surface opposite to the coil and a first side surface formed in a direction intersecting with the first magnetized surface, the second magnet being magnetized in a direction intersecting with the magnetization direction of the first magnet and including a second magnetized surface in contact with the first side surface of the first magnet, the second magnetized surface being magnetized to the same magnetic pole as the first magnetized surface.

[0020] In addition, the lens driving device includes a coil wound around a driving direction of the driving lens and a magnet group arranged facing the coil, the magnet group includes a first magnet and a second magnet, the first magnet is magnetized in one direction, and has a first magnetized surface opposite to the coil and a first side surface formed in a direction intersecting with the first magnetized surface, the second magnet is magnetized in a direction intersecting with the magnetization direction of the first magnet, and has a second magnetized surface in contact with the first side surface of the first magnet, the second magnetized surface is magnetized to the same magnetic pole as the first magnetized surface, and the coil can also be wound along the boundary between the first magnet and the second magnet.

[0021] Another aspect of the present invention is a photographic device including the electromagnetic driving device or the lens driving device.

[0022] Furthermore, another aspect of the present invention is an electronic device including the electromagnetic driving device or the camera device.

[0023] [Effects of the invention]

[0024] According to the present invention, the magnet group includes a first magnet and a second magnet, the first magnet is magnetized in one direction, and has a first magnetized surface opposite to the coil and a first side surface formed in a direction intersecting with the first magnetized surface, the second magnet is magnetized in a direction intersecting with the magnetization direction of the first magnet, and has a second magnetized surface in contact with the first side surface of the first magnet, the second magnetized surface and the first magnetized surface are magnetized to the same magnetic pole, through such a structure, the magnetic flux emitted by the first magnetized surface increases, and the magnetic flux emitted by the surface opposite to the first magnetized surface decreases, thereby obtaining the effect of a larger electromagnetic force generated in the coil and a smaller magnetic field leaking to the outside.

Brief Description of the Drawings

[0025]

Figure 1

[0026]

Figure 2

[0027]

Figure 3

[0028]

Figure 4

[0029]

Figure 5

[0030]

Figure 6

[0031]

Figure 7

[0032]

Figure 8

[0033]

Fig. 9

[0034]

Fig.10

[0035]

Fig.11

[0036]

Fig.12

[0037]

Fig.13

[0038]

Fig.14

[0039]

Fig.15

[0040]

Fig.16

[0041]

Fig.17

[0042]

Fig.18

[0043]

Fig.19

[0044]

Fig. 20

[0045] [Reference Signs]

[0046] 10 Lens drive device

[0047] 12 Shielding cover

[0048] 14 Upper elastic member

[0049] 16 magnet base

[0050] 18 Magnet Group

[0051] 18X1, 18X2 X-direction drive magnet set

[0052] 18Y Y direction drive magnet set

[0053] 18Z Z-direction drive magnet set

[0054] 20 Lens support

[0055] 22X X-direction drive coil

[0056] 22Y Y direction drive coil

[0057] 22, 22Z Z-direction drive coil

[0058] 24 Lower elastic member

[0059] 26 Support Line

[0060] 28 Printed coil substrate

[0061] 30 Wiring board

[0062] 32 Base

[0063] 34 First hole

[0064] 36 Magnet base side fixing part

[0065] 38 Lens support body side fixing portion

[0066] 40 Elastic wrist

[0067] 42 Support wire fixing part

[0068] 44 Magnet seat side protrusion

[0069] 46 Supporting body

[0070] 48 Coil fixing part

[0071] 50 Flange

[0072] 52 Magnet base side fixing part

[0073] 54 Lens support body side fixing portion

[0074] 56 Elastic wrist

[0075] 58 XY direction drive coil

[0076] 60 External connection terminals

[0077] 62 Recessed portion for external terminals

[0078] 64 Second hole

[0079] 66 Mobile

[0080] 68 First Magnet

[0081] 70 Second Magnet

[0082] 72 First magnetized surface

[0083] 74 First side

[0084] 76 Second magnetized surface

[0085] 78 Second side

[0086] 80 magnet body

[0087] 82 First Magnet Group

[0088] 84 Second Magnet Group

[0089] 86 Coil body

[0090] 88 Connection

[0091] 90 Yoke

[0092] 92 Fixed body

[0093] 94 Frame

[0094] 98 First moving body plate

[0095] 100 Second moving body plate

[0096] 102 Cover

[0097] 104 XY direction support mechanism

[0098] 106 First support mechanism

[0099] 108 Second support mechanism

[0100] 110 first support part

[0101] 112 First guide section

[0102] 114 Second support part

[0103] 116 Z direction support mechanism

[0104] 118 Third support part

[0105] 120 Third guide section [Specific implementation method]

[0106] Embodiments of the present invention will be described below with reference to the accompanying drawings.

[0107] Figure 1 and Figure 2 The present invention embodies an example of the electromagnetic driving device according to the first embodiment of the present invention, namely, a lens driving device 10. The lens driving device 10 is mounted on a camera device, and the camera device is mounted in an electronic device such as a smart phone.

[0108] The lens driving device 10 includes a shield cover 12 , an upper elastic member 14 , a magnet seat 16 , a magnet group 18 , a lens support 20 , a Z-direction driving coil 22 , a lower elastic member 24 , a support wire 26 , a printed coil substrate 28 , a wiring substrate 30 , and a base 32 .

[0109] Furthermore, for ease of understanding, in this specification, in the XYZ rectangular coordinate system, the optical axis direction of the lens of the lens driving device 10 is the Z direction, and directions perpendicular to the optical axis are the X direction and the Y direction.

[0110] The shield cover 12 is made of a non-magnetic material such as stainless steel, and has a square shape when viewed from above, and is provided with a circular first hole 34 through which light passes. The periphery of the lens driving device 10 is covered by the shield cover 12 and a base 32 mounted at the bottom of the shield cover 12.

[0111] The upper elastic component 14 is divided into two parts, which are respectively provided with a magnet seat side fixing part 36, a lens support body side fixing part 38 and an elastic wrist part 40 connecting the magnet seat side fixing part 36 and the lens support body side fixing part 38. The upper elastic component 14 is provided with a support wire fixing part 42 protruding outward in a ring shape from the magnet seat side fixing part 36. The magnet seat side fixing part 36 is embedded in the magnet seat side protrusion 44 formed on the magnet seat 16 at the four corners of the magnet seat 16 and fixed by an adhesive or the like. A lens support body side protrusion (not shown) is formed on the upper surface of the lens support body 20, and the lens support body side fixing part 38 of the upper elastic component 14 is embedded in the lens support body side protrusion and fixed by an adhesive or the like. The elastic wrist part 40 extends from the magnet seat side fixing part 36 to the lens support body side fixing part 38 in a zigzag manner and is connected to the lens support body side fixing part 38.

[0112] The lens support body 20 includes a cylindrical support body 46, a plurality of coil fixing portions 48 protruding outward from the outer peripheral surface of the support body 46, and a flange portion 50 protruding in a flange shape from the outer peripheral surface of the support body 46. For example, a thread is formed inside the support body 46, and a lens (not shown) is screwed into it and fixed.

[0113] The Z-direction drive coil 22 is wound around the Z-axis direction by, for example, a copper core wire, to form an octagonal ring. The Z-direction drive coil 22 contacts the lower surface of the flange portion 50 of the lens support body 20 and the outer surface of the coil fixing portion 48, and is fixed to the lens support body 20. The outer surface of the Z-direction drive coil 22 is opposite to each inner surface of the magnet group 18. In addition, one end of the Z-direction drive coil 22 is electrically connected to one side of the upper elastic component 14 divided into two parts, and the other end is electrically connected to the other side of the upper elastic component 14.

[0114] The lower elastic member 24 has the same structure as the upper elastic member 14, and is provided with a magnet seat side fixing portion 52, a lens support body side fixing portion 54, and an elastic arm portion 56 connecting the magnet seat side fixing portion 52 and the lens support body side fixing portion 54. The magnet seat side fixing portion 52 is fixed to the four corners of the lower part of the magnet seat 16 by adhesives or the like. The lens support body side fixing portion 54 is fixed to the lower surface of the lens support body 20 by adhesives or the like. The lens support body 20 is clamped in the up-down direction by the upper elastic member 14 and the lower elastic member 24, and is supported to be freely movable up-down relative to the magnet seat 16.

[0115] The printed coil substrate 28 is formed into a square frame, and XY direction driving coils 58 are provided on the four sides of the printed coil substrate 28. The XY direction driving coils 58 face the lower surface of the magnet group 18 and together with the magnet group 18 constitute an actuator for hand shake compensation.

[0116] The wiring substrate 30 has an external connection terminal 60 formed on one side of the wiring substrate 30 so as to protrude downward. The external terminal 60 is exposed to the outside through a recess 62 for an external terminal formed in the shield case 12.

[0117] The base 32 is located below the shielding cover 12 and is fixed to the inner side of the shielding cover 12. The base 32 is provided with a circular second hole 64 through which light passes.

[0118] The wiring substrate 30 is fixed above the base 32 , and the printed coil substrate 28 is fixed above the wiring substrate 30 .

[0119] The upper elastic member 14, the magnet holder 16, the magnet group 18, the lens support 20, the Z-direction driving coil 22 and the lower elastic member 24 constitute a moving body 66. The moving body 66 is supported by four supporting wires 26 at its four corners.

[0120] That is, the support wire 26 is an elastically deformable thin wire, one end of which is fixed to the wiring substrate 30, and the other end is fixed to the support wire fixing portion 42 of the upper elastic member 14. The support wire 26 is elastically deformable, and thus supports the movable body 66 so that the movable body 66 can move parallel to the XY direction.

[0121] Two of the support wires 26 also serve as wiring. That is, the Z-direction adjustment current entering from the external connection terminal 60 of the wiring substrate 30 flows through one of the support wires 26, flows to the Z-direction driving coil 22 through one of the upper elastic member 14 divided into two parts, and then flows out from the external connection terminal 60 of the wiring substrate 30 through the other part of the upper elastic member 14 and the other of the support wires 26.

[0122] After the lens driving device 10 is completed, the lens support body 20 supports the lens. The lens driving device 10 with the lens support body 20 supporting the lens is mounted on a photographic device. In the photographic device, the light emitted from the subject and input through the lens is detected by a light receiving sensor. The movement amount of the lens used to focus on the subject is calculated by a controller equipped on the photographic device. The controller controls the current corresponding to the lens movement amount to flow to the Z-direction driving coil 22. If the Z-direction driving coil 22 is energized, the magnetic flux emitted by the magnet group 18 will cause the Z-direction driving coil 22 to generate a Lorentz force (electromagnetic force) that wants to move upward or downward. If the Lorentz force is generated in the Z-direction driving coil 22, the lens, the coil 22 and the lens support body 20 together move against the upper elastic component 14 and the lower elastic component 24, thereby focusing.

[0123] In addition, if the camera shakes, the direction and amount of the deviation are detected by a sensor (not shown), and the XY direction driving coil 58 provided on the printed circuit board 30 is energized to generate a reaction force of the Lorentz force in the movable body 66, causing it to move in the XY direction against the elastic force of the support wire 26, thereby obtaining compensation.

[0124] Next, the magnet group 18 will be described in detail.

[0125] Magnet group 18 Figure 3 As shown, there are a first rectangular parallelepiped magnet 68 and second rectangular parallelepiped magnets 70, 70 provided on both sides of the first magnet 68 in the ±Y direction.

[0126] The first magnet 68 is magnetized along the X direction. Figure 4 As shown, the surface facing the Z-direction driving coil 22 is a first magnetized surface 72 magnetized to, for example, N pole, and the opposite coil side is magnetized to S pole. In addition, the first magnet 68 has first side surfaces 74, 74 intersecting the first magnetized surface 72 of the first magnet 68 at 90 degrees.

[0127] The second magnets 70, 70 are magnetized in the Y direction. That is, the surface in contact with the first side surface 74, 74 of the first magnet 68 is the second magnetized surface 76, 76 magnetized to, for example, the N pole, and the side opposite to the first magnet is magnetized to the S pole. The first magnetized surface 72 is magnetized to the N pole like the second magnetized surface 76, 76. In addition, the second magnets 70, 70 have second side surfaces 78, 78 intersecting the second magnetized surfaces 76, 76 at 90 degrees, and the second side surfaces 78, 78 face the Z direction driving coil 22 side. The second side surfaces 78, 78 are formed on almost the same plane as the first magnetized surface 72 of the first magnet 68. In this embodiment, the direction from the second magnet 70 side on one side to the second magnet 70 side on the other side is the Y direction, sometimes referred to as the first direction.

[0128] In addition, the N pole and the S pole may be reversed.

[0129] In the Y direction, the lengths of the second magnets 70 , 70 are shorter than the length of the first magnet 68 , and the length of the first magnet 68 is substantially equal to the length of one side of the Z-direction driving coil 22 .

[0130] As mentioned above, the Z-direction driving coil 22 is wound around the optical axis into an octagonal ring, and each side is formed in the tangent direction of the imaginary circle centered on the optical axis. In addition, the magnet group 18 is arranged close to one side of the Z-direction driving coil 22 so that the first direction is consistent with the winding direction of the Z-direction driving coil 22. The normal line of the first magnetized surface 72 of the first magnet 68 is toward the radius direction of the imaginary circle. The current in the Z-direction driving coil 22 flows along the first direction.

[0131] Next, through Figures 5 to 9 The functions of the magnet group 18 and the Z-direction driving coil 22 will be described.

[0132] The magnet group 18 is as Figure 5 As shown, the second magnets 70, 70 are respectively arranged at the ends of the first magnet 68 in the ±Y direction. The length of the first magnet 68 in the Y direction is 4, and the length of each of the second magnets 70, 70 in the Y direction is 1. The first magnetized surface 72 is set on the +X side. The magnetic flux density in A-A' is used as the magnetic flux density in the Z-direction driving coil 22. In addition, the magnetic flux density in BB' is used as the leakage magnetic flux density on the side opposite to the first magnetized surface 72.

[0133] Figure 6 , Figure 8 The horizontal axis of the graph is 0 at the center of the first magnet 68, with both ends being ±2, and the vertical axis being the magnetic flux density in AA' and the magnetic flux density in BB'. The solid line indicates when the second magnet 70, 70 is configured, and the dotted line indicates when it is not configured.

[0134] Figure 7 , Fig. 9The horizontal axis in is the length of the second magnet 70 in the Y direction, and 0 is when the second magnet 70 is not configured. The vertical axes are the average magnetic flux density in AA' and the average magnetic flux density in BB', which are relative values ​​when the second magnet 70 is not configured, with the average magnetic flux density as 1.

[0135] The longer the second magnet 70 is, the more significantly the magnetic flux density in AA′, which is the magnetic flux density in the Z-direction drive coil 22, increases. In particular, the increase rate of the magnetic flux density near the boundary between the first magnet 68 and the second magnets 70, 70 is large.

[0136] As the length of the second magnet 70 increases to a certain length, the magnetic flux density in BB', which is the leakage magnetic flux density on the side opposite to the first magnetized surface 72, decreases significantly, especially the magnetic flux density decreases more in the vicinity of the boundary between the first magnet 68 and the second magnet 70, 70. Therefore, the magnetic field leaking to the outside can be reduced.

[0137] Next, the second embodiment will be described.

[0138] Fig.10 The embodiment embodies the magnet body 80 according to the second embodiment.

[0139] The magnet body 80 is composed of a first magnet group 82 and a second magnet group 84 of substantially the same size overlapped in the Z direction. The first magnet group 82 on the +Z side is the same as the magnet group 18 of the first embodiment, and includes a rectangular first magnet 68 and rectangular second magnets 70, 70 arranged on both sides of the first magnet 68 in the ±Y direction. The first magnet 68 is magnetized in the X direction, and the second magnets 70, 70 are magnetized in the Y direction. The +X side of the first magnet 68 is an N pole, and the -X side is an S pole; the inner side of the second magnets 70, 70 is an N pole, and the outer side is an S pole.

[0140] The second magnet group 84 is the same as the first magnet group 82, and includes a rectangular first magnet 68 and rectangular second magnets 70, 70 disposed on both sides of the first magnet 68 in the ±Y direction, but the magnetic pole structure is opposite to that of the first magnet group 82. That is, the +X side of the first magnet 68 is an S pole, and the -X side is an N pole; the inner side of the second magnets 70, 70 is an S pole, and the outer side is an N pole.

[0141] The first magnetized surface 72 and the second side surface 78, 78 of the first magnet group 82 and the first magnetized surface 72 and the second side surface 78, 78 of the second magnet group 84 are formed on substantially the same plane. In addition, the second magnetized surfaces 76, 76 of the first magnet group 82 and the second magnetized surfaces 76, 76 of the second magnet group 84 are formed on substantially the same plane on both sides of the ±Y direction.

[0142] like Fig.11As shown, the Z-direction driving coil 22 includes two coil main bodies 86, 86 extending in the Y direction and spaced apart in the Z direction, and connecting parts 88, 88 connecting the ends of the two coil main bodies 86, 86 to each other. One coil main body 86 faces the first magnetized surface 72 of the first magnet group 82, and the other coil main body 86 faces the first magnetized surface 72 of the second magnet group 84.

[0143] The first magnet group 82 and the second magnet group 84 are configured to have different magnetic poles, and the currents flowing in the Z-direction driving coil 22 are opposite, so the Z-direction driving coil 22 has the same direction of Lorentz force acting in the Z direction. In addition, in the second embodiment, the Z-direction driving coil 22 is formed into a ring shape by the coil body parts 86, 86 and the connecting parts 88, 88, but two Z-direction driving coils 22 shown in the first embodiment may also be used. At this time, the Z-direction driving coil 22 on one side is opposite to the first magnetized surface 72 of the first magnet group 82, and the Z-direction driving coil 22 on the other side is opposite to the first magnetized surface 72 of the second magnet group 84, and the current flows in opposite directions.

[0144] Next, the third embodiment will be described.

[0145] Fig.12 The magnet group 18 according to the third embodiment is embodied.

[0146] The third embodiment is different from the first embodiment in that a yoke 90 made of a magnetic body is provided. The yoke 90 is formed to surround the side and back sides of the magnet group 18. By surrounding the magnet group 18 with the yoke 90, the magnetic flux density applied to the drive coil can be further increased, and the magnetic field leaking to the outside can be further reduced.

[0147] Next, a fourth embodiment will be described.

[0148] In the first to third embodiments, the magnetization direction of the second magnets 70, 70 is perpendicular to the magnetization direction of the first magnet 68. In contrast, in the fourth embodiment, Fig.13 As shown, the magnetization directions of the second magnets 70, 70 are tilted from the Y direction.

[0149] That is, the magnetization direction of the second magnet 70 on the +Y side is at an obtuse angle greater than 90 degrees in the clockwise direction relative to the magnetization direction of the first magnet 68, and the magnetization direction of the second magnet 70 on the -Y side is at an obtuse angle greater than 90 degrees in the counterclockwise direction relative to the magnetization direction of the first magnet 68.

[0150] Fig.14 and Fig.15In the figure, the horizontal axis is the magnetization direction of the second magnet 70 relative to the magnetization direction of the first magnet 68, and the vertical axis is the magnetic flux density in the Z-direction driving coil 22 and the leakage magnetic flux density on the side opposite to the first magnetization surface 72, which is a relative value of 1 when the magnetization direction of the second magnet 70 is 90 degrees.

[0151] like Fig.14 and Fig.15 As shown, if the magnetization directions of the second magnets 70, 70 are within 120 degrees, the magnetic flux density applied to the Z-direction driving coil 22 can be increased, and the leakage magnetic flux density can be controlled to be substantially constant.

[0152] Figures 16 to 20 This embodiment embodies the fifth embodiment of the present invention.

[0153] The lens driving device 10 includes a fixed body 92 having a shield cover 12 and a base 32, and the movable body 66 is supported so as to be freely movable in the Z direction relative to the fixed body 92. The base 32 is a box body opened at the top, and various coils described later are arranged on the inner surface of the side surface. The shield cover 12 is a box body opened at the bottom, and is fixed to the base 32 from the upper outside.

[0154] The moving body 66 is as follows Fig.17 As shown, the lens support body 20 and the frame body 94 surrounding the lens support body 20 are provided. The lens support body 20 and the frame body 94 have a nearly square shape when viewed from above.

[0155] After the lens driving device 10 is completed, the lens 96 is mounted inside the lens support 20. In addition, the frame 94 includes a first movable body plate 98, a second movable body plate 100, and a cover 102. The cover 102 is fixed to the second movable body plate 100.

[0156] The frame 94 has an XY direction support mechanism 104 , and the lens support body 20 is supported by the XY direction support mechanism 104 so as to be movable in the X direction and the Y direction.

[0157] The XY direction support mechanism 104 includes a first support mechanism 106 and a second support mechanism 108. The first support mechanism 106 includes a first support portion 110 formed by protruding from a surface facing the lower side of the first movable body plate 98 and a first guide portion 112 formed by being recessed from a surface facing the upper side of the second movable body plate 100, and the first support portion 110 is embedded in the first guide portion 112. The first support portion 110 and the first guide portion 112 extend in the X direction, and the first movable body plate 98 is free to move only in the X direction relative to the second movable body plate 100.

[0158] The second support mechanism 108 includes a second support portion 114 formed by protruding from the surface facing the upper side of the first movable plate 98 and a second guide portion (not shown) formed by being recessed from the surface facing the lower side of the lens support body 20, and the second support portion 114 is embedded in the second guide portion. The second support portion 114 and the second guide portion extend in the Y direction, and the lens support body 20 is free to move only in the Y direction relative to the first movable body plate 98. Therefore, the lens support body 20 is free to move in the X direction and the Y direction relative to the second movable body plate 100.

[0159] In addition, the movable body 66 is supported by the Z-direction support mechanism 116 so as to be freely movable in the Z direction relative to the fixed body 92. The Z-direction support mechanism 116 includes third support parts 118, 118 provided on the base 32 of the fixed body 92 and third guide parts 120, 120 provided on the second movable body plate 100 of the movable body 66. The third support parts 118, 118 protrude in a rod shape from the bottom of the base 32 in the +Z direction, and are embedded in the inner side of the third guide parts 120, 120, so as to support the movable body 66 to be freely movable in the Z direction. Therefore, the lens support body 20 is supported so as to be freely movable in the X direction, the Y direction, and the Z direction relative to the fixed body 92.

[0160] In addition, the same parts as those in the first embodiment are marked with the same symbols in the drawings and the description thereof is omitted.

[0161] The lens support body 20 has an X-direction drive magnet group 18X1 and 18X2 fixed to its outer side in the ±X direction. Fig.18 As shown in FIG. 1 , X-direction drive coils 22X1 and 22X2 are fixed to face the X-direction drive magnet groups 18X1 and 18X2. The X-direction drive coils 22X1 and 22X2 are electrically connected in series.

[0162] A Y-direction driving magnet group 18Y is fixed to the -Y direction outer side surface of the lens support body 20. On the other hand, a Y-direction driving coil 22Y is fixed to the -Y direction inner side surface of the base 32, facing the Y-direction driving magnet group 18Y.

[0163] In addition, a Z-direction driving magnet group 18Z is fixed to the +Y-direction outer side surface of the second movable body plate 100. On the other hand, a Z-direction driving coil 22Z is ​​fixed to the +Y-direction inner side surface of the base 32, opposite to the Z-direction driving magnet group 18Z. The Z-direction driving magnet group 18Z and the Z-direction driving coil 22Z can respectively adopt the same structure as the magnet body 80 and the Z-direction driving coil 22 of the second embodiment. However, the Z-direction driving coil 22Z is ​​provided on the fixed body 92, so that the lens support body 20 mounted on the movable body 66 moves in the Z direction due to the reaction force of the Lorentz force acting on the Z-direction driving magnet group 18Z.

[0164] The X-direction driving magnet group 18X1, 18X2 and the Y-direction driving magnet group 18Y as well as the X-direction driving coils 22X1, 22X2 and the Y-direction driving coil 22Y have the same structure. The Y-direction driving magnet group 18Y and the Y-direction driving coil 22Y are representatively described.

[0165] The Y-direction driving magnet group 18Y itself has the same structure as the first embodiment, but the setting method of the XYZ axes is different. Fig.19 As shown, there are a first rectangular parallelepiped magnet 68 and second rectangular parallelepiped magnets 70, 70 provided on both sides of the first magnet 68 in the ±Z direction.

[0166] Here, only the magnetization direction and magnetization surface are briefly described. The first magnet 68 is magnetized in the Y direction. That is, the surface on the Y side of the Y-direction driving coil 22 is the first magnetization surface 72 magnetized to the N-pole side, for example, and the anti-coil side is magnetized to the S-pole side.

[0167] The second magnets 70, 70 are magnetized in the Z direction. That is, the surface of the first side surface 74, 74 contacting the first magnet 68 is the second magnetized surface 76, 76 magnetized to the N pole side, for example, and the side opposite to the first magnet is magnetized to the S pole. The first magnetized surface 72 and the second magnetized surface 76, 76 are the same and magnetized to the N pole.

[0168] The Y-direction driving coil 22Y includes two coil main bodies 86, 86 extending in the X direction, and the ends of the coil main bodies 86, 86 are spaced apart as shown in FIG. Fig.18 As shown, since the two connecting portions 88 and 88 are connected, the current flows in the coil main body portion 86 on one side and the current flows in the coil main body portion 86 on the other side in opposite directions.

[0169] The coil main bodies 86, 86 of the Y-direction driving coil 22Y are opposed to each other along the boundaries between the first magnet 68 and the second magnet 70, 70. In the fifth embodiment, only the magnetic flux of the Z-direction component is used for driving. Fig. 20 As shown, the Z-direction component increases due to the second magnets 70, 70, and the Y-direction Lorentz force generated in the Y-direction driving coil 22Y also increases. The moving body 66 moves in the Y-direction together with the Y-direction driving magnet group 18Y due to the reaction force of the Lorentz force.

[0170] In addition, the X-direction driving magnet group 18X1, 18X2 and the X-direction driving coils 22X1, 22X2 also play the same role. When power is supplied to the X-direction driving coils 22X1, 22X2, the movable body 66 moves along the X-direction together with the X-direction driving magnet group 18X1, 18X2 due to the reaction force of the Lorentz force.

[0171] Since the structure of the magnet group is completely the same as that of the first embodiment, the leakage magnetic flux density to the outside can also be reduced in the fifth embodiment.

[0172] Furthermore, the driving coils may be the two Z-direction driving coils 22 shown at the end of the second embodiment. In this case, the driving coils are arranged along the boundaries between the first magnet 68 and the second magnet 70, 70 so that the current flows in opposite directions.

[0173] Furthermore, this specification describes a lens driving device for a camera device, but the present invention can also be used for a device for driving optical components other than a lens, such as a mirror and a prism, and can also be applied to an electromagnetic driving device such as an electromagnetic driving motor and an electromagnetic driving actuator. In addition, the electromagnetic driving device is used in electronic equipment.

Claims

1. An electromagnetic drive device, characterized in that: A coil and a magnet group arranged facing the coil; The magnet group comprises a first magnet and a second magnet; The first magnet is magnetized in one direction and has a first magnetized surface opposite to the coil and a first side surface formed at a 90-degree intersection with the first magnetized surface; The second magnet is magnetized in a direction intersecting with the magnetization direction of the first magnet and has a second magnetized surface in contact with the first side surface of the first magnet; The second magnetized surface and the first magnetized surface are magnetized to the same magnetic pole; The first magnet has two first side surfaces, the two first side surfaces sandwich the first magnetized surface on opposite sides, and the two second magnets are in contact with the two first side surfaces, respectively.

2. The electromagnetic drive device according to claim 1, characterized in that: The length of the second magnet in a direction in which the first side surface of the first magnet contacts the second magnetized surface of the second magnet is shorter than the length of the first magnet in the same direction.

3. The electromagnetic drive device according to claim 1, characterized in that: The coil is wound in a first direction from one side of the second magnet to another side of the second magnet.

4. The electromagnetic drive device according to claim 3, characterized in that: It has two magnet groups, the first magnetization surfaces and the second magnetization surfaces of the two magnet groups are adjacent to each other and formed on approximately the same plane, and the first magnetization surfaces of the two magnet groups are magnetized to opposite poles, and the second magnetization surfaces of the two magnet groups are magnetized to opposite poles. In the coil, the current flowing along one of the first magnetization surfaces in the first direction is in opposite directions to the current flowing along the other first magnetization surface in the first direction.

5. The electromagnetic drive device according to claim 4, characterized in that: The coil includes two coil main bodies that face the two first magnetized surfaces and are formed parallel to the first direction, and connecting parts that connect ends of the two coil main bodies to each other.

6. The electromagnetic drive device according to claim 1, characterized in that: The coil is wound along a boundary between the first magnet and the second magnet, and a current flowing to the coil wound along one of the boundaries and a current flowing to the coil wound along the other boundary are in opposite directions.

7. The electromagnetic drive device according to claim 6, characterized in that: The coil includes two coil main body portions formed along the two boundaries, respectively, and connection portions connecting end portions of the two coil main body portions to each other.

8. The electromagnetic drive device according to claim 1, characterized in that: A yoke is provided on the counter-coil side of the first magnet and the second magnet.

9. A lens driving device, characterized in that: A coil extending in a tangent direction of an imaginary circle centered on the optical axis of the lens and a magnet group arranged facing the coil; The magnet group comprises a first magnet and a second magnet; The first magnet is magnetized along the radial direction of the imaginary circle, and has a first magnetized surface opposite to the coil and a first side surface formed at a 90-degree intersection with the first magnetized surface; The second magnet is magnetized in a direction intersecting with the magnetization direction of the first magnet and has a second magnetized surface in contact with the first side surface of the first magnet; The second magnetized surface and the first magnetized surface are magnetized to the same magnetic pole; The first magnet has two first side surfaces, the two first side surfaces sandwich the first magnetized surface on opposite sides, and the two second magnets are in contact with the two first side surfaces, respectively.

10. A lens driving device, characterized in that: A coil wound around the driving direction of the driving lens and a magnet group arranged facing the coil; The magnet group comprises a first magnet and a second magnet; The first magnet is magnetized in one direction and has a first magnetized surface opposite to the coil and a first side surface formed at a 90-degree intersection with the first magnetized surface; The second magnet is magnetized in a direction intersecting with the magnetization direction of the first magnet and has a second magnetized surface in contact with the first side surface of the first magnet; The second magnetized surface and the first magnetized surface are magnetized to the same magnetic pole; The coil is wound along the boundary between the first magnet and the second magnet; The first magnet has two first side surfaces, the two first side surfaces sandwich the first magnetized surface on opposite sides, and the two second magnets are in contact with the two first side surfaces, respectively.

11. A photographing device comprising the electromagnetic driving device according to claim 1 or the lens driving device according to claim 9 or claim 10.

12. An electronic device comprising the electromagnetic driving device according to claim 1 or the camera device according to claim 11.

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