CN110632730A - Electromagnetic driving device, lens driving device, camera device and electronic apparatus - Google Patents
Electromagnetic driving device, lens driving device, camera device and electronic apparatus Download PDFInfo
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- CN110632730A CN110632730A CN201810661272.4A CN201810661272A CN110632730A CN 110632730 A CN110632730 A CN 110632730A CN 201810661272 A CN201810661272 A CN 201810661272A CN 110632730 A CN110632730 A CN 110632730A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B7/00—Mountings, adjusting means, or light-tight connections, for optical elements
- G02B7/02—Mountings, adjusting means, or light-tight connections, for optical elements for lenses
- G02B7/04—Mountings, adjusting means, or light-tight connections, for optical elements for lenses with mechanism for focusing or varying magnification
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Abstract
The invention provides an electromagnetic driving device and a lens driving device, wherein the electromagnetic force generated in a coil is large, the magnetic field leaked to the outside is small, and a camera device and an electronic device provided with the lens driving device, the electromagnetic driving device is provided with a coil 22 and a magnet group 18 arranged facing the coil 22, the magnet group 18 includes a first magnet 68 magnetized in one direction, and second magnets 70, 70, the first magnet 68 including a first magnetized surface 72 facing the coil 22 and first side surfaces 74, 74 formed in a direction intersecting the first magnetized surface 72, the second magnets 70, 70 are magnetized in a direction intersecting the magnetization direction of the first magnets, and have second magnetization surfaces 76, 76 in contact with the first side surfaces 74, 74 of the first magnets 68, the second magnetized surfaces 76, 76 are magnetized to the same magnetic pole as the first magnetized surface 72.
Description
[ technical field ] A method for producing a semiconductor device
The present invention relates to an electromagnetic driving device, a lens driving device, and a camera device and an electronic apparatus provided with the lens driving device.
[ background of the invention ]
Previous electromagnetic drives may employ coils and magnet packs. A known magnet group structure is one in which a soft magnetic material facing a coil is sandwiched between magnets (for example, patent document 1).
[ Prior art documents ]
[ patent document ]
[ patent document 1 ] Japanese patent application laid-open No. 2011-521285 (WO 2009/139543).
[ summary of the invention ]
[ problem to be solved by the invention ]
The conventional electromagnetic driving device has a problem that: although the electromagnetic force generated in the coil is large, the magnetic field leaking from the surface opposite to the coil to the outside is large.
An object of the present invention is to solve the above-described conventional problems and to provide an electromagnetic driving device, a lens driving device, and a camera and an electronic apparatus including the lens driving device, in which electromagnetic force generated in a coil is large and a magnetic field leaking to the outside is small.
[ technical solution ] A
An electromagnetic driving device according to an aspect of the present invention includes a coil and a magnet group disposed facing the coil, the magnet group including a first magnet magnetized in one direction, a first magnetization surface facing the coil, and a first side surface formed in a direction intersecting the first magnetization surface, and a second magnet magnetized in a direction intersecting the first magnet magnetization direction, the second magnet including a second magnetization surface in contact with the first side surface of the first magnet, the second magnetization surface magnetized to have the same magnetic pole as the first magnetization surface.
Preferably, a length of the second magnet in a direction in which the first side surface of the first magnet contacts the second magnetization surface of the second magnet is shorter than a length of the first magnet in the same direction.
Preferably, the first magnet has 2 first side surfaces formed on the opposite side of the first magnet with the first magnetization surface interposed therebetween, and the 2 second magnets are in contact with the 2 first side surfaces, respectively.
Preferably, the coil is wound in a first direction from one of the second magnet sides to the other of the second magnet sides.
In the coil, a current flowing in the first direction along one of the first magnetization surfaces may be opposite to a current flowing in the first direction along the other of the first magnetization surfaces.
In this case, the coil may include 2 coil main bodies facing the 2 first magnetization surfaces and formed parallel to the first direction, and connection portions connecting end portions of the 2 coil main bodies to each other.
Preferably, the coil is wound along a boundary between the first magnet and the second magnet, and a current flowing through the coil wound along one of the boundaries is opposite to a current flowing through the coil wound along the other of the boundaries.
In this case, it is preferable that the coil includes 2 coil main bodies formed along the 2 boundaries, respectively, and connection portions connecting end portions of the 2 coil main bodies to each other, respectively.
Further, a yoke may be provided on the side surfaces of the counter coils of the first and second magnets.
Another aspect of the present invention is a lens driving device including a coil extending in a tangential direction of an imaginary circle having a lens optical axis as a center, and a magnet group disposed facing the coil, the magnet group including a first magnet magnetized in a radial direction of the imaginary circle, the first magnet including a first magnetized surface facing the coil and a first side surface formed in a direction intersecting the first magnetized surface, and a second magnet magnetized in a direction intersecting the magnetized direction of the first magnet, the second magnet including a second magnetized surface contacting the first side surface of the first magnet, the second magnetized surface magnetized to have the same magnetic pole as the first magnetized surface.
The lens driving device may further include a coil wound around a driving direction of the driving lens, and a magnet group disposed facing the coil, wherein the magnet group includes a first magnet magnetized in one direction, a first magnetization surface facing the coil, and a first side surface formed in a direction intersecting the first magnetization surface, and a second magnet magnetized in a direction intersecting the first magnet magnetization direction, and a second magnetization surface in contact with the first side surface of the first magnet, the second magnetization surface and the first magnetization surface being magnetized to have the same magnetic pole, and the coil may be wound around a boundary between the first magnet and the second magnet.
Another aspect of the present invention is a camera apparatus including the electromagnetic driving device or the lens driving device.
In another aspect of the present invention, the electronic device includes the electromagnetic driving device or the camera.
[ Effect of the invention ]
According to the present invention, the magnet group includes the first magnet magnetized in one direction, the first magnet including the first magnetized surface facing the coil and the first side surface formed in the direction intersecting the first magnetized surface, and the second magnet magnetized in the direction intersecting the first magnetized surface, and the second magnet including the second magnetized surface contacting the first side surface of the first magnet, the second magnetized surface and the first magnetized surface being magnetized to the same magnetic pole, and with this configuration, the magnetic flux emitted from the first magnetized surface increases, and the magnetic flux emitted from the surface opposite to the first magnetized surface decreases, so that the electromagnetic force generated in the coil increases, and the magnetic field leaking to the outside decreases.
[ description of the drawings ]
Fig. 1 is an exploded perspective view of a lens driving device according to a first embodiment of the present invention.
FIG. 2 is a cross-sectional view of a lens driving device according to a first embodiment of the present invention.
FIG. 3 is a perspective view of a magnet assembly used in accordance with a first embodiment of the present invention.
Fig. 4 is a perspective view of the magnet assembly and the Z-direction driving coil used in the first embodiment of the present invention.
Fig. 5 is a schematic plan view of a magnet assembly used in the first embodiment of the present invention.
Fig. 6 is a graph showing the magnetic flux density in the Z-direction drive coil, comparing the case where the second magnet according to the first embodiment of the present invention is provided and the case where the second magnet is not provided.
Fig. 7 is a graph showing the average magnetic flux density in the Z-direction drive coil with respect to the length of the second magnet in the first embodiment of the present invention.
Fig. 8 is a graph showing the leakage magnetic flux density when the second magnet according to the first embodiment of the present invention is included and not included, which is compared with each other.
Fig. 9 is a diagram showing a leakage magnetic flux density with respect to the second magnet length in the first embodiment of the present invention.
Fig. 10 is an oblique view of a magnet body used in the second embodiment of the present invention.
Fig. 11 is a perspective view of a magnet body and a Z-direction drive coil used in the second embodiment of the present invention.
Fig. 12 is a perspective view of a magnet assembly used in a third embodiment of the present invention.
Fig. 13 is a schematic plan view of a magnet assembly used in the fourth embodiment of the present invention.
Fig. 14 is a diagram showing the magnetic flux density in the Z-direction drive coil with respect to the magnetization direction angle in the fourth embodiment of the present invention.
Fig. 15 is a diagram showing a leakage magnetic flux density with respect to a magnetization direction angle in the fourth embodiment of the present invention.
Fig. 16 is an exploded perspective view of a lens driving device according to a fifth embodiment of the present invention.
Fig. 17 is an exploded perspective view of a moving body according to a fifth embodiment of the present invention.
Fig. 18 is a perspective view of a magnet group and a driving coil according to a fifth embodiment of the present invention.
Fig. 19 is a schematic plan view of a magnet group for Y-direction driving and a coil for Y-direction driving in a fifth embodiment of the present invention.
Fig. 20 is a schematic plan view showing a relationship between a magnetic flux generated by the Y-direction driving magnet group and the Y-direction driving coil in the fifth embodiment of the present invention.
[ reference numerals ]
10 lens driving device
12 shield cover
14 upper elastic part
16 magnet seat
18 magnet group
18X1，18X2Magnet group for driving in X direction
18Y Y magnet group for direction drive
18Z Z magnet group for direction drive
20 lens support
22X X direction driving coil
22Y Y direction driving coil
Coil for 22, 22Z Z direction driving
24 lower elastic part
26 supporting wire
28 printed coil substrate
30 wiring board
32 base
34 first hole
36 magnet seat side fixing part
38 lens holder side fixing part
40 elastic wrist
42 support wire fixing part
44 magnet seat side protrusion
46 support the main body part
48 coil fixing part
50 flange part
52 magnet seat side fixing part
54 lens holder side fixing part
56 elastic wrist
58 XY-direction drive coil
60 external connection terminal
62 recess for external terminal
64 second hole
66 moving body
68 first magnet
70 second magnet
72 first magnetized surface
74 first side
76 second magnetized surface
78 second side
80 magnet body
82 first magnet group
84 second magnet group
86 coil body part
88 connecting part
90 magnetic yoke
92 fixed body
94 frame body
98 first movable body plate
100 second Mobile body plate
102 cover
104 XY direction supporting mechanism
106 first support mechanism
108 second support mechanism
110 first support part
112 first guide part
114 second support part
116Z-direction supporting mechanism
118 third support part
120 third guide part
[ detailed description ] embodiments
Embodiments of the present invention will be described below with reference to the drawings.
Fig. 1 and 2 show a lens driving device 10 as an example of an electromagnetic driving device according to a first embodiment of the present invention. The lens driving device 10 is mounted on a camera device mounted in an electronic apparatus such as a smartphone.
The lens driving device 10 includes a shield case 12, an upper elastic member 14, a magnet holder 16, a magnet group 18, a lens support body 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.
For convenience of understanding, in the present specification, the optical axis direction of the lens driving device 10 is defined as the Z direction, and the directions perpendicular to the optical axis are defined as the X direction and the Y direction in the XYZ rectangular coordinate system.
The shield case 12 is made of a nonmagnetic material such as stainless steel, and has a square outer shape when viewed from above, and a circular first hole 34 is provided, and light passes through the first hole 34. The periphery of the lens driving device 10 is covered by the shield case 12 and a base 32 attached to the lower portion of the shield case 12.
The upper elastic member 14 is divided into 2 parts, and includes a magnet holder-side fixing portion 36, a lens support body-side fixing portion 38, and an elastic arm portion 40 connecting the magnet holder-side fixing portion 36 and the lens support body-side fixing portion 38. The upper elastic member 14 includes a support wire fixing portion 42 annularly protruding outward from the magnet holder side fixing portion 36. The magnet holder-side fixing portion 36 is fitted to the magnet holder-side protrusion 44 formed on the magnet holder 16 at the four corners of the magnet holder 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 portion 38 of the upper elastic member 14 is fitted into the lens support body-side protrusion and fixed by an adhesive or the like. The elastic arm portion 40 extends from the magnet holder side fixing portion 36 to the lens holder side fixing portion 38 in a meandering manner, and is connected to the lens holder side fixing portion 38.
The lens support body 20 includes a cylindrical support body 46, a plurality of coil fixing portions 48 bulging outward from the outer peripheral surface of the support body 46, and a flange portion 50 projecting in a flange shape from the outer peripheral surface of the support body 46. The support body 46 is formed with, for example, a screw thread inside, and a lens (not shown) is screwed therein to be fixed.
The Z-direction driving coil 22 is formed in an octagonal ring shape by winding a copper core wire or the like around the Z-axis direction. The Z-direction driving coil 22 is fixed to the lens support 20 in contact with the lower surface of the flange portion 50 of the lens support 20 and the outer surface of the coil fixing portion 48. The outer surface of the Z-direction drive coil 22 faces each inner surface of the magnet group 18. One end of the Z-direction driving coil 22 is electrically connected to one of the upper elastic members 14 divided into 2 portions, and the other end is electrically connected to the other of the upper elastic members 14.
The lower elastic member 24 has the same configuration as the upper elastic member 14, and includes a magnet holder-side fixing portion 52, a lens holder-side fixing portion 54, and an elastic arm portion 56 connecting the magnet holder-side fixing portion 52 and the lens holder-side fixing portion 54. The magnet holder-side fixing portions 52 are fixed to four corners of the lower portion of the magnet holder 16 by an adhesive or the like. The lens holder-side fixing portion 54 is fixed to the lower surface of the lens holder 20 by an adhesive or the like. The lens support 20 is vertically sandwiched between the upper elastic member 14 and the lower elastic member 24, and is supported to be movable vertically relative to the magnet holder 16.
The printed coil substrate 28 is formed as a rectangular frame, and XY-direction driving coils 58 are provided on four sides of the printed coil substrate 28. The XY-direction driving coil 58 faces the lower surface of the magnet group 18, and constitutes an actuator for compensating for camera shake together with the magnet group 18.
The wiring board 30 has an external connection terminal 60 formed thereon so as to protrude downward from one side of the wiring board 30. The external terminal 60 is exposed to the outside through an external terminal recess 62 formed in the shield case 12.
The base 32 is located below the shield case 12 and fixed to the inside of the shield case 12. The base 32 is provided with a circular second hole 64, and light passes through the second hole 64.
A wiring board 30 is fixed above the base 32, and a printed coil board 28 is fixed above the wiring board 30.
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 single movable body 66. The moving body 66 is supported by 4 support lines 26 at four corners of the moving body 66.
That is, the support wire 26 is an elastically deformable thin wire, and one end of the support wire 26 is fixed to the wiring board 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 moving body 66 so that the moving body 66 can move in parallel in the XY directions.
2 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 board 30 flows through one of the support wires 26, flows through one of the upper elastic members 14 divided into 2 portions toward the Z-direction driving coil 22, and flows out from the external connection terminal 60 of the wiring board 30 through the other of the upper elastic members 14 and the other of the support wires 26.
After the lens driving device 10 is completed, the lens is supported by the lens support 20. The lens driving device 10 having the lens support 20 for supporting the lens is mounted on the camera. In the camera device, light rays emitted from a subject and input through the lens are detected by a light receiving sensor. The amount of movement of the lens for subject focusing is calculated by a controller equipped on the camera. The controller controls the current corresponding to the lens movement amount to flow to the Z-direction driving coil 22. When the Z-direction driving coil 22 is energized, the magnetic flux generated by the magnet group 18 generates a lorentz force (electromagnetic force) that tends to move upward or downward in the Z-direction driving coil 22. When the Z-direction driving coil 22 generates a lorentz force, the lens moves against the upper elastic member 14 and the lower elastic member 24 together with the coil 22 and the lens support body 20, and is focused.
If camera shake occurs, the direction and amount of the shift are detected by a sensor (not shown), and the XY-direction drive coil 58 provided on the printed circuit board 30 is energized to generate a reaction force of the lorentz force in the moving body 66, so that the moving body is moved in the XY direction against the elastic force of the support line 26, thereby being compensated.
The magnet group 18 will be described in detail below.
As shown in fig. 3, the magnet group 18 includes a first magnet 68 having a rectangular parallelepiped shape, and second magnets 70, 70 provided in a rectangular parallelepiped shape on both sides in the ± Y direction of the first magnet 68.
The first magnet 68 is magnetized in the X direction. That is, as shown in fig. 4, the surface facing the Z-direction driving coil 22 is a first magnetized surface 72 magnetized to, for example, an N-pole, and the counter-coil side is magnetized to an S-pole. The first magnet 68 also has first side surfaces 74, 74 that intersect the first magnetization surface 72 of the first magnet 68 at 90 degrees.
The second magnets 70, 70 are magnetized in the Y direction. That is, the surfaces in contact with the first side surfaces 74, 74 of the first magnet 68 are second magnetized surfaces 76, 76 magnetized to, for example, the N-pole, and the opposite side of the first magnet is magnetized to the S-pole. The first magnetized surface 72 is magnetized to the N-pole, like the second magnetized surfaces 76, 76. The second magnets 70, 70 have second side surfaces 78, 78 intersecting the second magnetization 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 in substantially the same plane as the first magnetized surface 72 of the first magnet 68. In the present embodiment, the direction from one second magnet 70 side to the other second magnet 70 side is the Y direction, and may be referred to as the first direction.
In addition, the N pole and the S pole can be reversed.
The lengths of the second magnets 70, 70 in the Y direction 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.
The Z-direction driving coil 22 is wound in an octagonal ring shape around the optical axis as described above, and each side is formed in a tangential direction of an imaginary circle having the optical axis as a center. The magnet group 18 is disposed next to one side of the Z-direction drive coil 22 so that the first direction coincides with the winding direction of the Z-direction drive coil 22. The normal line of the first magnetization surface 72 of the first magnet 68 faces the radial direction of the imaginary circle. The current flows in the Z-direction driving coil 22 in the first direction.
Next, the operation of the magnet group 18 and the Z-direction driving coil 22 will be described with reference to fig. 5 to 9.
As shown in fig. 5, the magnet group 18 has second magnets 70, 70 disposed at the ± Y-direction end portions of the first magnet 68, respectively. The length of the first magnet 68 in the Y direction is set to 4, and the length of each of the second magnets 70, 70 in the Y direction is set to 1. The first magnetized surface 72 is provided on the + X side. The magnetic flux density in the a-a' is used as the magnetic flux density in the Z-direction drive coil 22. Further, the magnetic flux density in B-B' is used as the leakage magnetic flux density on the anti-first magnetized surface 72 side.
The horizontal axis in fig. 6 and 8 is 0 at the center position of the first magnet 68, ± 2 at both ends, and the vertical axis is the magnetic flux density at a-a 'and the magnetic flux density at B-B'. The solid lines indicate when the second magnets 70, 70 are arranged, and the broken lines indicate when they are not arranged.
The horizontal axis in fig. 7 and 9 indicates the length of the second magnet 70 in the Y direction, and 0 indicates when the second magnet 70 is not disposed. The vertical axes represent the average magnetic flux density in A-A 'and the average magnetic flux density in B-B', respectively, and are relative values such that the average magnetic flux density is 1 when the second magnet 70 is not disposed.
The longer the length of the second magnet 70 is, the more significantly the magnetic flux density in a-a', which is the magnetic flux density in the Z-direction drive coil 22, increases, and particularly the rate of increase in the magnetic flux density near the boundary between the first magnet 68 and the second magnets 70, 70 is large.
As the length of the second magnet 70 is longer to a certain length, the magnetic flux density in B-B', which is the leakage magnetic flux density on the anti-first magnetization surface 72 side, is significantly reduced, and particularly, the reduction ratio of the magnetic flux density in the vicinity of the boundary between the first magnet 68 and the second magnets 70, 70 is large. Therefore, the magnetic field leaking to the outside can be reduced.
Next, a second embodiment will be explained.
Fig. 10 shows a magnet body 80 according to the second embodiment.
The magnet body 80 is formed by overlapping a first magnet group 82 and a second magnet group 84 having substantially the same size in the Z direction. The first magnet group 82 on the + Z side includes a first magnet 68 having a rectangular parallelepiped shape, and second magnets 70, 70 provided in a rectangular parallelepiped shape on both sides in the ± Y direction of the first magnet 68, similarly to the magnet group 18 of the first embodiment. 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 the N pole, and the-X side is the S pole; the second magnets 70, 70 have an N-pole on the inner side and an S-pole on the outer side.
The second magnet group 84 is also provided with a first magnet 68 having a rectangular parallelepiped shape and second magnets 70, 70 provided on both sides of the first magnet 68 in the ± Y direction in a rectangular parallelepiped shape, similarly to the first magnet group 82, but with a magnetic pole configuration opposite to that of the first magnet group 82. That is, the + X side of the first magnet 68 is the S pole, and the-X side is the N pole; the second magnets 70, 70 have S poles on the inner side and N poles on the outer side.
The first and second magnetized faces 72, 78 of the first magnet group 82 and the first and second magnetized faces 72, 78 of the second magnet group 84 are formed on approximately the same plane. In addition, the second magnetization surfaces 76, 76 of the first magnet group 82 and the second magnetization surfaces 76, 76 of the second magnet group 84 are formed on almost the same plane on both sides in the ± Y direction, respectively.
As shown in fig. 11, the Z-direction driving coil 22 includes 2 coil main bodies 86, 86 extending in the Y-direction and spaced apart from each other in the Z-direction, and connection portions 88, 88 connecting ends of the 2 coil main bodies 86, 86 to each other. One coil body portion 86 faces the first magnetized surface 72 of the first magnet group 82, and the other coil body portion 86 faces the first magnetized surface 72 of the second magnet group 84.
The first magnet group 82 and the second magnet group 84 have different magnetic poles, and the currents flowing through the Z-direction driving coil 22 are opposite to each other, so that the Z-direction driving coil 22 has the lorentz force acting in the same direction as the Z-direction. In the second embodiment, the Z-direction driving coil 22 is formed in a ring shape by the coil main bodies 86, 86 and the connection portions 88, but 2Z-direction driving coils 22 shown in the first embodiment may be used. At this time, one of the Z-direction driving coils 22 faces the first magnetized surface 72 of the first magnet group 82, and the other Z-direction driving coil 22 faces the first magnetized surface 72 of the second magnet group 84, so that the current flows in the opposite direction.
Next, a third embodiment will be explained.
Fig. 12 shows a magnet group 18 according to the third embodiment.
In the third embodiment, the following points are different from the first embodiment: a yoke 90 made of a magnetic body is provided. The yoke 90 is formed in a structure surrounding the side and rear surfaces of the magnet group 18. By surrounding the magnet group 18 with the yoke 90 in this way, 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.
Next, a fourth embodiment will be explained.
In contrast to the first to third embodiments in which the magnetization directions of the second magnets 70, 70 are perpendicular to the magnetization direction of the first magnet 68, the fourth embodiment has the magnetization directions of the second magnets 70, 70 inclined from the Y direction as shown in fig. 13.
That is, the magnetization direction of the + Y-side second magnet 70 forms an obtuse angle of more than 90 degrees in the clockwise direction with respect to the magnetization direction of the first magnet 68, and the magnetization direction of the-Y-side second magnet 70 forms an obtuse angle of more than 90 degrees in the counterclockwise direction with respect to the magnetization direction of the first magnet 68.
In fig. 14 and 15, the abscissa indicates the magnetization direction of the second magnet 70 with respect to the magnetization direction of the first magnet 68, and the ordinate indicates the magnetic flux density in the Z-direction driving coil 22 and the leakage magnetic flux density on the anti-first magnetization surface 72 side, respectively, and the relative values are 1 when the magnetization direction of the second magnet 70 is 90 degrees.
As shown in fig. 14 and 15, if the magnetization direction of the second magnets 70, 70 is 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.
Fig. 16 to 20 show a fifth embodiment of the present invention.
The lens driving device 10 includes a fixed body 92 having the shield case 12 and the base 32, and the movable body 66 is supported to be movable in the Z direction against the fixed body 92. The base 32 is a box body opened upward, and various coils described later are arranged on the inner surface of the side surface thereof. The shield case 12 is a box body opened downward, and is fixed to the base 32 from the upper outer side.
As shown in fig. 17, the movable body 66 includes a lens support 20 and a frame 94 surrounding the lens support 20. The lens support 20 and the frame 94 have a substantially rectangular outer shape when viewed from above.
After the lens driving device 10 is completed, the lens 96 is mounted on the inner side of the lens support 20. 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 moving body plate 100.
The frame 94 includes an XY-direction support mechanism 104, and the lens support body 20 is supported by the XY-direction support mechanism 104 to be movable in the X direction and the Y direction.
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 to protrude toward a surface facing a lower side of the first movable body plate 98 and a first guide portion 112 formed to be recessed toward a surface facing an upper side of the second movable body plate 100, and the first support portion 110 is fitted into the first guide portion 112. The first support portion 110 and the first guide portion 112 extend in the X direction, and the first moving body plate 98 is movable only in the X direction with respect to the second moving body plate 100.
The second support mechanism 108 includes a second support portion 114 formed to protrude toward a surface facing the upper side of the first moving plate 98 and a second guide portion (not shown) formed to be recessed toward a surface facing the lower side of the lens support body 20, and the second support portion 114 is fitted into 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 movable only in the Y direction with respect to the first moving body plate 98. Therefore, the lens support 20 is movable in the X direction and the Y direction with respect to the second movable body plate 100.
The movable body 66 is supported by a Z-direction support mechanism 116 to be movable in the Z-direction relative to the fixed body 92. The Z-direction support mechanism 116 includes third support portions 118, 118 provided on the base 32 of the fixed body 92, and third guide portions 120, 120 provided on the second movable body plate 100 of the movable body 66. The third support portions 118, 118 protrude from the bottom of the base 32 in the + Z direction in a bar shape, are fitted inside the third guide portions 120, and support the moving body 66 to be movable in the Z direction. Therefore, the lens support body 20 is supported to be movable in the X direction, the Y direction, and the Z direction with respect to the fixed body 92.
The same portions as those of the first embodiment are denoted by the same reference numerals on the drawings, and the description thereof will be omitted.
An X-direction driving magnet group 18X is fixed on the + -X-direction outer side surface of the lens support body 201，18X2. On the other hand, as shown in fig. 18, the X-direction driving coil 22X is fixed to the ± X-direction inner surface of the base 321，22X218X magnet group for driving in X direction1，18X2And (4) oppositely. X-direction driving coil 22X1，22X2Are electrically connected in series.
Further, a Y-direction driving magnet group 18Y is fixed to a-Y-direction outer side surface of the lens support 20. On the other hand, the Y-direction drive coil 22Y is fixed to the-Y-direction inner surface of the base 32, and faces the Y-direction drive magnet group 18Y.
Further, 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, the Z-direction drive coil 22Z is fixed to the + Y-direction inner surface of the base 32, and faces the Z-direction drive magnet group 18Z. The Z-direction driving magnet group 18Z and the Z-direction driving coil 22Z have the same structures as the magnet body 80 and the Z-direction driving coil 22 of the second embodiment, respectively. However, since the Z-direction driving coil 22Z is provided on the fixed body 92, the lens support body 20 mounted on the moving body 66 moves in the Z-direction due to a reaction force of the lorentz force acting on the Z-direction driving magnet group 18Z.
Magnet group 18X for X-direction drive1，18X2And a magnet group 18Y for driving in the Y direction and a coil 22X for driving in the X direction1，22X2And the Y-direction driving coil 22Y. The description will be made with the magnet group 18Y for Y-direction drive and the coil 22Y for Y-direction drive as representative.
The Y-direction driving magnet group 18Y itself has the same structure as that of the first embodiment, but the method of setting the XYZ axes is different in the description. That is, as shown in fig. 19, the Y-direction driving magnet group 18Y includes a first magnet 68 having a rectangular parallelepiped shape and second magnets 70, 70 provided in a rectangular parallelepiped shape on both sides in the ± Z direction of the first magnet 68.
The magnetization direction and the magnetization plane will be described only briefly here. The first magnet 68 is magnetized in the Y direction. That is, the Y-direction driving coil 22Y side surface is the first magnetized surface 72 magnetized to the N-pole side, for example, and the counter coil side surface is magnetized to the S-pole.
The second magnets 70, 70 are magnetized in the Z direction. That is, the surfaces contacting the first side surfaces 74, 74 of the first magnet 68 are the second magnetized surfaces 76, 76 magnetized, for example, to the N-pole side, and the opposite first magnet side is magnetized to the S-pole. The first magnetized surface 72 and the second magnetized surfaces 76, 76 are the same and magnetized to N-pole.
The Y-direction driving coil 22Y includes 2 coil main bodies 86, 86 extending in the X-direction, and since the ends of the coil main bodies 86, 86 are connected by 2 connection portions 88, 88 as shown in fig. 18, the current flow direction of one coil main body 86 is opposite to that of the other coil main body 86.
The coil main bodies 86, 86 of the Y-direction driving coil 22Y face each other along the boundary between the first magnet 68 and the second magnets 70, 70. In the fifth embodiment, only the magnetic flux of the Z-direction component is used for driving. As shown in fig. 20, the Z-direction component increases due to the arrangement of the second magnets 70, and the lorentz force in the Y-direction generated in the Y-direction driving coil 22Y also increases. The moving body 66 moves in the Y direction together with the Y-direction drive magnet group 18Y due to the reaction force of the lorentz force.
In addition, the magnet group 18X for driving in the X direction1，18X2And a coil 22X for driving in the X direction1，22X2Also serving the same purpose as that of driving the coil 22X in the X direction1，22X2When the moving body 66 is energized in the middle of the period, the magnet group 18X for driving in the X direction is caused by the reaction force of the Lorentz force1，18X2Together moving in the X direction.
Since the structure of the magnet assembly is completely the same as that of the first embodiment, the leakage flux density to the outside can be reduced in the fifth embodiment.
The drive coils may be drive coils such as the 2Z-direction drive coils 22 described in the last embodiment. At this time, the respective drive coils are arranged along the boundary between the respective first and second magnets 68, 70 so that the directions of current flow are opposite.
Further, although the present description has been made of the lens driving device used in the photographic device, the present invention can be applied to a device for driving optical members other than the 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 for electronic equipment.
Claims (13)
1. An electromagnetic drive device, characterized in that:
the magnet assembly includes a coil and a magnet group disposed facing the coil;
the magnet group comprises a first magnet and a second magnet;
the first magnet is magnetized in one direction, and is provided with a first magnetized surface opposite to the coil and a first side surface formed in a direction intersecting the first magnetized surface;
the second magnet is magnetized in a direction intersecting the magnetization direction of the first magnet, and has a second magnetization surface in contact with the first side surface of the first magnet;
the second magnetization surface is magnetized to the same magnetic pole as the first magnetization surface.
2. The electromagnetic drive of claim 1, wherein: 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.
3. The electromagnetic drive of claim 1, wherein: the first magnet is provided with 2 first side surfaces on the opposite side of the first magnetization surface, and the 2 second magnets are respectively in contact with the 2 first side surfaces.
4. An electromagnetic drive according to claim 3, wherein: the coil is wound in a first direction from one of the second magnet sides to the other of the second magnet sides.
5. The electromagnetic drive apparatus according to claim 4, characterized in that: the magnetic circuit is provided with 2 magnet groups, wherein a first magnetization surface and a second magnetization surface of each of the 2 magnet groups are adjacent to each other, are formed on substantially the same plane, and have opposite magnetic poles, and a current flowing in the first direction along one of the first magnetization surfaces and a current flowing in the first direction along the other of the first magnetization surfaces in the coil are in opposite directions.
6. An electromagnetic drive according to claim 5, wherein: the coil includes 2 coil main bodies facing the 2 first magnetization surfaces and formed parallel to the first direction, and connection portions connecting end portions of the 2 coil main bodies to each other.
7. An electromagnetic drive according to claim 3, wherein: the coil is wound along a boundary between the first magnet and the second magnet, and a current flowing through the coil wound along one of the boundaries is opposite to a current flowing through the coil wound along the other of the boundaries.
8. An electromagnetic drive according to claim 7, wherein: the coil includes 2 coil main bodies formed along the 2 boundaries, respectively, and connection portions connecting ends of the 2 coil main bodies to each other, respectively.
9. The electromagnetic drive of claim 1, wherein: and magnetic yokes are arranged on the side faces of the counter coils of the first magnet and the second magnet.
10. A lens driving device characterized in that:
the lens driving device comprises a coil extending in a tangential direction of an imaginary circle with a lens optical axis as a center and a magnet group arranged to face the coil;
the magnet group comprises a first magnet and a second magnet;
the first magnet is magnetized in a radial direction of the imaginary circle, and includes a first magnetized surface facing the coil and a first side surface formed in a direction intersecting the first magnetized surface;
the second magnet is magnetized in a direction intersecting the magnetization direction of the first magnet, and has a second magnetization surface in contact with the first side surface of the first magnet;
the second magnetization surface is magnetized to the same magnetic pole as the first magnetization surface.
11. A lens driving device characterized in that:
a magnet group which is provided with a coil wound around a driving direction of a driving lens and is arranged to face the coil;
the magnet group comprises a first magnet and a second magnet;
the first magnet is magnetized in one direction, and is provided with a first magnetized surface opposite to the coil and a first side surface formed in a direction intersecting the first magnetized surface;
the second magnet is magnetized in a direction intersecting the magnetization direction of the first magnet, and has a second magnetization surface in contact with the first side surface of the first magnet;
the second magnetization surface and the first magnetization surface are magnetized to be the same magnetic pole;
the coil is wound along a boundary between the first magnet and the second magnet.
12. A camera device comprising the electromagnetic driving device according to claim 1 or the lens driving device according to claim 10 or claim 11.
13. An electronic device comprising the electromagnetic driving device according to claim 1 or the camera according to claim 12.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810661272.4A CN110632730A (en) | 2018-06-25 | 2018-06-25 | Electromagnetic driving device, lens driving device, camera device and electronic apparatus |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810661272.4A CN110632730A (en) | 2018-06-25 | 2018-06-25 | Electromagnetic driving device, lens driving device, camera device and electronic apparatus |
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| CN110632730A true CN110632730A (en) | 2019-12-31 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810661272.4A Pending CN110632730A (en) | 2018-06-25 | 2018-06-25 | Electromagnetic driving device, lens driving device, camera device and electronic apparatus |
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| CN (1) | CN110632730A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112987450A (en) * | 2021-05-07 | 2021-06-18 | 新思考电机有限公司 | Optical member driving device, camera device and electronic apparatus |
| CN113126231A (en) * | 2021-04-28 | 2021-07-16 | 新思考电机有限公司 | Optical anti-shake drive mechanism, drive and image pickup device, and electronic apparatus |
-
2018
- 2018-06-25 CN CN201810661272.4A patent/CN110632730A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113126231A (en) * | 2021-04-28 | 2021-07-16 | 新思考电机有限公司 | Optical anti-shake drive mechanism, drive and image pickup device, and electronic apparatus |
| CN113126231B (en) * | 2021-04-28 | 2023-07-18 | 新思考电机有限公司 | Optical anti-shake driving mechanism, driving and image capturing device, and electronic apparatus |
| CN112987450A (en) * | 2021-05-07 | 2021-06-18 | 新思考电机有限公司 | Optical member driving device, camera device and electronic apparatus |
| CN112987450B (en) * | 2021-05-07 | 2021-08-17 | 新思考电机有限公司 | Optical member driving device, camera device and electronic apparatus |
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