CN117406531A - Optical element driving device, photographing device and electronic equipment - Google Patents

Abstract

The invention provides an optical element driving device, a photographic device and an electronic device which are not easy to increase friction coefficient in a guiding mechanism and can make the whole structure thinner, and the invention specifically comprises the following steps: the optical element driving device 10 includes guide mechanisms 34 (36, 38) for guiding movement of the optical element, the guide mechanisms including guide portions 42, 46 of grooves 42A, 46A and sliding planes 42B, 46B formed on the metal 1 st member 22, and support portions 40, 44 formed as a plurality of protrusions on the resin 2 nd members 24, 16. Some of the plurality of projections 40A, 44A made of resin are fitted into the grooves 40A, 44A made of metal, and the remaining projections 40B, 44B of the plurality of projections are brought into contact with the sliding planes 42B, 46B made of metal, so that the support portion and the guide portion slide.

Description

Optical element driving device, photographing device and electronic equipment

[ field of technology ]

The invention relates to an optical element driving device, a photographing device and an electronic device.

[ background Art ]

Small-sized camera devices are mounted on electronic devices such as mobile phones and smart phones. Such a compact camera device is provided with a lens driving device, and a product having a camera shake compensation function is known as described in patent document 1, for example.

[ Prior Art literature ]

[ patent literature ]

Japanese patent application laid-open No. 2009-217051 (patent document 1)

[ invention ]

[ problem to be solved by the invention ]

The above-mentioned patent document 1 is provided with a guide mechanism for freely moving the lens, and the guide mechanism includes a plurality of protrusions which are in sliding contact with the guide surfaces of the guide recesses.

However, there is a problem in that: the friction coefficient between the projection of such a guide mechanism and the guide surface may increase.

The present invention has been made to solve the above-mentioned problems, and an object thereof is to provide an optical element driving device, a photographic device, and an electronic device which are not easy to increase the friction coefficient in a guide mechanism and can make the overall structure thinner.

[ technical solution ]

One embodiment of the present invention is an optical element driving device. The optical element driving device is provided with a guide mechanism for guiding the movement of the optical element. The guide mechanism includes a groove and a guide portion of a sliding plane formed on a metal-made 1 st member, and a support portion formed as a plurality of protrusions on a resin-made 2 nd member. A part of the protrusions of the plurality of protrusions made of the resin are fitted into the grooves made of the metal, the remaining protrusions of the plurality of protrusions are in contact with the sliding plane made of the metal, and the supporting portion and the guiding portion slide.

Preferably, the optical element driving unit includes one 1 st member and two 2 nd members, wherein the one 1 st member includes the guide portion on both sides in an optical axis direction of the optical element, an extending direction of the groove provided on one side in the optical axis direction of the guide portion perpendicularly intersects an extending direction of the groove provided on the other side in the optical axis direction, and the two 2 nd members sandwich the 1 st member from both sides in the optical axis direction and include a support body for supporting the optical element on one side.

Preferably, the plate-like 1 st member has a rectangular outer shape, and one of the guide portions provided on both sides in the optical axis direction is formed on a surface of a projection portion protruding in a trapezoidal shape in the optical axis direction from the plate-like plate surface at four corners of the rectangular 1 st member.

Preferably, the other of the guide portions is formed on the back surface of the protrusion portion.

Preferably, the 1 st component is integrally formed.

Preferably, the 1 st member is formed by bonding two metal plate bodies, one of the guide portions provided on both sides in the optical axis direction is formed on one of the two metal plate bodies, and the other of the guide portions provided on both sides in the optical axis direction is formed on the other of the two metal plate bodies.

Preferably, the outer shape of each of the two metal plate bodies is rectangular, and one of the guide portions provided on both sides in the optical axis direction is formed on a surface of a projection portion protruding in a trapezoid from the plate-like plate surface in the optical axis direction at four corners of one of the metal plate bodies.

Another aspect of the present invention is a photographic apparatus including the optical element driving device of the above aspect and a lens as the optical element.

Another aspect of the present invention is a photographic apparatus including the optical element driving device of the above aspect and an image sensor as the optical element.

Another aspect of the present invention is an electronic apparatus including the camera device of the above aspect.

[ beneficial effects ]

According to the present invention, the 1 st member formed with the groove and the sliding plane constituting the guide mechanism is made of metal, and the 2 nd member formed with the protrusion fitted into the groove and the protrusion contacting the sliding plane is made of resin. Therefore, it is possible to provide an optical element driving device, a camera device, and an electronic device which are not easy to increase the friction coefficient in the guide mechanism and can make the overall structure thinner.

[ description of the drawings ]

Fig. 1 is a perspective view of a lens driving device according to an embodiment of the present invention from above obliquely.

Fig. 2 is a perspective view of a lens driving device according to an embodiment of the present invention from obliquely below.

Fig. 3 is an exploded perspective view of the lens driving device according to the first embodiment of the present invention, which is divided into a fixed body and a movable body, from above obliquely.

Fig. 4 is an exploded perspective view of the lens driving device according to the first embodiment of the present invention, when the movable body is detached, from the obliquely upward side.

Fig. 5 is an exploded perspective view of a lens driving device according to the first embodiment of the present invention, when the movable body is detached, from the obliquely lower side.

Fig. 6 (a) is a plan view of a 2 nd mobile body plate according to the first embodiment of the present invention, fig. 6 (B) is a sectional view taken along line VIB-VIB of fig. 6 (a), fig. 6 (C) is a sectional view taken along line VIC-VIC of fig. 6 (B), and fig. 6 (D) is an enlarged view of the VID portion of fig. 4.

Fig. 7 (a) is a bottom view of the lens support body according to the first embodiment of the present invention, fig. 7 (B) is a sectional view taken along line VIIB-VIIB of fig. 7 (a), fig. 7 (C) is a sectional view taken along line VIIC-VIIC of fig. 7 (a), and fig. 7 (D) is an enlarged view of the VIID portion of fig. 5.

Fig. 8 is a plan view of the mobile body according to the first embodiment of the present invention from above.

Fig. 9 (a) is a sectional view taken along line IXA-IXA of fig. 8, fig. 9 (B) is a sectional view taken along line IXB-IXB of fig. 8, fig. 9 (C) is a sectional view taken along line IXC-IXC of fig. 8, and fig. 9 (D) is a sectional view taken along line IXD-IXD of fig. 8.

Fig. 10 is a perspective view showing a modified example of the 1 st movable body plate according to the first embodiment of the present invention.

Fig. 11 is an exploded oblique view from obliquely above after the moving body according to the second embodiment of the present invention is disassembled.

Fig. 12 is an exploded perspective view of the mobile body according to the second embodiment of the present invention, as seen from obliquely below.

Fig. 13 is a plan view of a mobile body according to a second embodiment of the present invention from above.

Fig. 14 (a) is a cross-sectional view taken along line XIVA-XIVA of fig. 13, fig. 14 (B) is a cross-sectional view taken along line XIVB-XIVB of fig. 13, fig. 14 (C) is a cross-sectional view taken along line XIVC-XIVC of fig. 13, and fig. 14 (D) is a cross-sectional view taken along line XIVD-XIVD of fig. 13.

Fig. 15 is a perspective view showing a modified example of the 1 st movable body plate according to the second embodiment of the present invention.

[ number Specification ]

10. Lens driving device

12. Fixing body

14. Moving body

16. Lens support

18. No. 1 frame

20. Hole for lens installation

22. No. 1 moving body plate

22A slit

24. 2 nd moving body plate

26. Cover cap

28. 30, 32 through holes

34. Orthogonal direction guiding mechanism

36. No. 1 guide mechanism

38. 2 nd guiding mechanism

42. 1 st guide part

42A 1 st groove

42B 1 st sliding plane

40. 40A, 40B 1 st support portion

46. 2 nd guide part

46A 2 nd groove

46B 2 nd sliding plane

44. 44A, 44B No. 2 support

48. Mounting part

50. Mounting hole

52. Mounted part

54. 1 st magnet

56. 1 st magnetic yoke

58. 2 nd magnet

60. 2 nd magnetic yoke

62. No. 2 frame

64. Base seat

66. Cover cap

68. Bottom surface portion

70. Upper surface portion

72. 74 through holes

76. Pillar portion

78. Flexible circuit board

80. Terminal part

82. 1 st coil

84. 2 nd coil

86. Magnetic component

88. Optical axis direction supporting mechanism

90. Capstan shaft

92. Auxiliary guide shaft

94. Guide hole

96. Guide wall

98. No. 1 moving body plate

98A slit

100. Lower metal plate

102. Upper side metal plate

104. 1 st guide part

104A 1 st groove

104B 1 st sliding plane

106. 2 nd guide part

106A 2 nd groove

106B 2 nd sliding plane

[ detailed description ] of the invention

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

First embodiment

Fig. 1 to 9 show a first embodiment of a lens driving device 10 as an optical element driving device of the present invention. The lens driving device 10 is used in a camera device mounted in an electronic device such as a smart phone together with a lens used as an optical element.

The lens driving unit 10 includes a fixed body 12 and a movable body 14 supported so as to be movable relative to the fixed body 12. As shown in fig. 4 and 5, the movable body 14 includes a lens support 16 for supporting a lens (not shown) and a 1 st frame 18 surrounding the lens support 16. The lens support 16 and the 1 st frame 18 have a substantially rectangular outer shape when viewed from above.

For ease of understanding, the optical axis direction of the lens is referred to as a Z direction, a direction perpendicularly intersecting the optical axis direction is referred to as an X direction, and a direction perpendicularly intersecting the Z direction and the X direction is referred to as a Y direction in this specification. The object side of the optical axis is referred to as an upper side, and the side opposite to the object side on which an image sensor (not shown) is disposed is referred to as a lower side.

A lens mounting hole 20 having a circular shape as viewed in the Z direction is formed inside the lens support 16, and a lens is mounted on the lens mounting hole 20.

The 1 st frame 18 is constituted by a 1 st moving body plate 22, a 2 nd moving body plate 24, and a 1 st cover 26. The lens support 16 and the 2 nd movable body plate 24 are made of engineering plastics such as Liquid Crystal Polymer (LCP), polyaldehyde resin, polyamide, polycarbonate, modified polyphenylene ether, polybutylene terephthalate, and the like. Further, the 1 st moving body plate 22 and the 1 st cover 26 are made of, for example, metal. Through holes 28, 30, 32 for passing light are formed in the 1 st movable body plate 22, the 2 nd movable body plate 24, and the 1 st cover 26, respectively. The through holes 28, 30, 32 are each formed in a substantially circular shape.

The 1 st frame 18 supports the lens support 16 to be movable in both the Y direction and the X direction. That is, the 1 st frame 18 includes an orthogonal direction guide mechanism 34, and the lens support 16 is supported by the orthogonal direction guide mechanism 34 so as to be movable in the XY directions.

The orthogonal direction support mechanism 34 is constituted by a 1 st support mechanism 36 and a 2 nd support mechanism 38 which are spaced apart in the Z direction. The 1 st support mechanism 36 is provided below the Z direction, and includes a 1 st guide portion 42 and a 1 st support portion 40. The 1 st guide 42 is formed on the lower surface of the 1 st movable body plate 22, and includes a 1 st groove 42A recessed in the +z direction and a 1 st sliding plane 42B. The 1 st support portion 40 is formed as a plurality of protrusions protruding in the +z direction on the upper surface of the 2 nd movable body plate 24, including a 1 st support portion 40A corresponding to the 1 st groove 42A and a 1 st support portion 40B corresponding to the 1 st sliding plane 42B. The 1 st support portion 40A has the same shape as the 1 st support portion 40B, and as shown in fig. 6, the size in the X direction is larger than the size in the Y direction, and is integrally formed in a semi-cylindrical shape, and both ends in the X direction are formed in a 1/4 sphere shape, smoothly connected to the semi-cylindrical portion.

In the 1 st guide mechanism 36, the 1 st guide portion 42 and the 1 st support portion 40 are arranged at four corners of the 1 st movable body plate 22 and the 2 nd movable body plate 24 having rectangular outer shapes. The 1 st guide portion 42 provided at both ends of the side on the-Y side where the 1 st magnet 54 and the magnetic member 86 are provided is formed as a V-shaped 1 st groove 42A, and the 1 st groove 42A extends in the X direction. The 1 st guide portion 42 provided at both ends of the +y side in the opposite direction is formed as a 1 st sliding plane 42B, and the 1 st sliding plane 42B extends in the X-Y plane. The two 1 st support portions 40 on the Y side are 1 st support portions 40A, which are fitted into the 1 st groove 42A. The two 1 st support portions 40 on the +y side are 1 st support portions 40B, which are in contact with the 1 st sliding plane 42B. The 1 st groove 42A extending in the X direction is fitted to the first support portion 40A to restrict movement in the Y direction, so that the 1 st movable body plate 22 is free to move only in the X direction relative to the 2 nd movable body plate 24.

As shown in fig. 9 (a) and 9 (B), the 1 st groove 42A is V-shaped and the 1 st support portion 40A is semicircular when viewed in the X direction. Accordingly, the arc-shaped curved portion of the 1 st support portion 40A and the V-shaped planar portion of the 1 st groove 42A are in two-point mutual contact on the section of the Y-Z plane, i.e., in two-point mutual line contact on the whole.

The cross-sectional shape of the 1 st support portion 40 is preferably such that the corner portion does not contact the bottom surface of the 1 st groove 42A, and is semicircular, but may be semi-elliptical. The 1 st groove 42A is V-shaped in cross section, but may be U-shaped. By making line contact at two places, the position of the 1 st support portion 40 with respect to the 1 st groove 42A in the Y direction can be determined without shaking.

As shown in fig. 9 (a) and 9 (B), the 1 st sliding surface 42B extends in the Y direction when viewed in the X direction, and the 1 st support portion 40B is semicircular similarly to the 1 st support portion 40A. Thus, the height of the 1 st movable body plate 22 in the Z direction with respect to the 2 nd movable body plate 24 can be determined. Further, the 1 st sliding plane 42B is wider in the Y direction than the 1 st supporting portion 40B. Therefore, even if the dimension between the 1 st support portion 40A and the 1 st support portion 40B is different from the dimension between the 1 st guide portion 42A and the 1 st guide portion 42B within a tolerance range, assembly can be performed.

Further, the 1 st guide portion 42 is made of metal, and the 1 st support portion 40 is made of resin. By contact of the metal and the resin, a small coefficient of friction is maintained. Therefore, the friction coefficient in the 1 st guide mechanism 36 is not easily increased.

The 2 nd support mechanism 38 is provided above the Z direction, and includes a 2 nd guide portion 46 and a 2 nd support portion 44. The 2 nd guide 46 is formed on the upper surface of the 1 st moving body plate 22, and includes a 2 nd groove 46A recessed in the-Z direction and a 2 nd sliding plane 46B. The 2 nd support portion 44 is formed as a plurality of protrusions protruding in the-Z direction on the lower surface of the lens support body 16, including a 2 nd support portion 44A corresponding to the 2 nd groove 46A and a 2 nd support portion 44B corresponding to the 2 nd sliding plane 46B. The 2 nd support portion 44A and the 2 nd support portion 44B have the same shape, and as shown in fig. 7, the dimension in the Y direction is larger than the dimension in the X direction, and are integrally formed in a semi-cylindrical shape, and both ends in the Y direction are 1/4 spherical shape and smoothly connected to the semi-cylindrical portion.

In the 2 nd guide mechanism 38, the 2 nd guide portion 46 and the 2 nd support portion 44 are arranged at four corners of the rectangular lens support 16 and the 1 st movable body plate 22. The 2 nd guide 46 provided at both ends of the +x side provided with the 1 st magnet 54 and the magnetic member 86 is formed as a V-shaped 2 nd groove 46A, and the 2 nd groove 46A extends in the Y direction. The 2 nd guide 46 provided at both ends of the side on the-X side in the opposite direction is formed as a 2 nd slide plane 46B, and the 2 nd slide plane 46B extends in the X-Y plane. The two 2 nd support portions 44 on the +x side are 2 nd support portions 44A, which are fitted into the 2 nd grooves 46A. The two 2 nd support portions 44 on the X side are 2 nd support portions 44B, which are in contact with the 2 nd sliding plane 46B. The 2 nd groove 46A extending in the Y direction is fitted to the 2 nd support portion 44A to restrict movement in the X direction, so that the lens support 16 is free to move only in the Y direction with respect to the 1 st movable body plate 22. The lens support body 16 is free to move in the X direction and the Y direction with respect to the 2 nd movable body plate 24 by the 1 st guide mechanism 36 and the 2 nd guide mechanism 38.

As shown in fig. 9 (C) and 9 (D), the 2 nd groove 46A is V-shaped and the 2 nd support portion 44A is semicircular when viewed in the Y direction. Thus, the curved surface portion of the 2 nd support portion 44A and the V-shaped planar portion of the 2 nd groove 46A are in two-point mutual contact on the cross section of the X-Z plane, i.e., in two-point mutual line contact on the whole.

The cross-sectional shape of the 2 nd support portion 44A is preferably such that the corner portion does not contact the bottom surface of the 2 nd groove 46A, but may be semicircular or semi-elliptical. The cross-sectional shape of the 2 nd groove 46A is V-shaped, but may be U-shaped. By making line contact at two places, the position of the 2 nd support portion 44A with respect to the 2 nd groove 46A in the X direction can be determined without shaking.

As shown in fig. 9 (C) and 9 (D), the 2 nd sliding surface 46B extends in the X direction when viewed in the Y direction, and the 2 nd support portion 44B is semicircular similarly to the 2 nd support portion 44A. The height of the lens support 16 in the Z direction with respect to the 1 st movable body plate 22 can thus be determined. Further, the width of the 2 nd sliding plane 46B in the X direction is wider than the width of the 2 nd supporting portion 44B in the X direction. Therefore, even if the dimension between the 2 nd support portion 44A and the 2 nd support portion 44B is different from the dimension between the 2 nd guide portion 46A and the 2 nd guide portion 46B within a tolerance range, assembly can be performed.

Further, the 2 nd guide portion 46 is made of metal, and the 2 nd support portion 44 is made of resin. By contact of the metal and the resin, a small coefficient of friction is maintained. Therefore, the friction coefficient in the 2 nd guide mechanism 38 is not easily increased.

The 1 st movable body plate 22 provided with the 1 st guide portion 42 and the 2 nd guide portion 46 is a plate-like member having a predetermined wall thickness and formed of a non-magnetic metal (for example, aluminum alloy). For example, the molten aluminum alloy may be poured into a mold for molding by an aluminum alloy die casting process. Further, the surface roughness may be reduced and the friction coefficient may be reduced by subjecting the surfaces of the 1 st guide 42 and the 2 nd guide 46 to mirror polishing or chemical polishing. In addition, a lubricant may be interposed between the 1 st guide portion 42 and the 1 st support portion 40 and between the 2 nd guide portion 46 and the 2 nd support portion 44. Further, the 1 st moving body plate 22 may be manufactured by a powder metallurgy method, and the porous copper or other metal body may be impregnated with a lubricant.

As shown in fig. 5, the 1 st groove 42A of the 1 st guide portion 42 is formed to be recessed in the +z direction from the plate surface on the-Z side of the 1 st movable body plate 22. The 1 st sliding plane 42B is formed at a position recessed in the +z direction from the plate surface on the-Z side of the 1 st movable body plate 22, and is parallel to the plate surface of the 1 st movable body plate 22. The 1 st sliding plane 42B is located at a position shallower than the groove depth of the 1 st groove 42A. Further, as shown in fig. 4, the 1 st groove 46A and the 2 nd sliding plane 46B of the 2 nd guide 46 are formed as protruding portions protruding in a trapezoid in the +z direction from the plate surface on the +z side of the 1 st moving body plate 22, wherein the 2 nd sliding plane 46B is formed in parallel with the plate surface of the 1 st moving body plate 22. The position of the 2 nd sliding plane 46B is located at a shallower position than the groove depth of the 2 nd groove 46A.

The structures of the 1 st guide mechanism 36 and the 2 nd guide mechanism 38 of the orthogonal direction guide mechanism 34 may be described as follows. The 1 st guide mechanism 36 includes a 1 st guide portion 42 including a 1 st groove 42A and a 1 st sliding plane 42B formed on the 1 st movable body plate 22 as the 1 st member, and a 1 st support portion 40 formed as a protrusion on the 2 nd movable body plate 24 as the 2 nd member. The 1 st support portion 40A is fitted into the 1 st groove 42A of the 1 st guide portion 42, the 1 st support portion 40B is in contact with the 1 st sliding plane 42B of the 1 st guide portion 42, and the 1 st guide portion 42 and the 1 st support portion 40 slide. The 1 st moving body plate 22 is made of metal, and the 2 nd moving body plate 24 is made of resin.

Further, the 2 nd guide mechanism 38 includes a 2 nd guide portion 46 including a 2 nd groove 46A and a 2 nd sliding plane 46B formed on the 1 st moving body plate 22 as the 1 st member, and a 2 nd support portion 44 formed as a protrusion on the lens support 16 as the 2 nd member. The 2 nd support portion 44A is fitted into the 2 nd groove 46A of the 2 nd guide portion 46, the 2 nd support portion 44B is in contact with the 2 nd slide plane 46B of the 2 nd guide portion 46, and the 2 nd guide portion 46 and the 2 nd support portion 44 slide. The 1 st movable body plate 22 is made of metal, and the lens support 16 is made of resin.

In the orthogonal direction guide mechanism 34, the 1 st movable body plate 22 as the 1 st member includes the 1 st guide portion 42 and the 2 nd guide portion 46 on both sides in the optical axis direction of the lens as the optical element. The 2 nd moving body plate 24 and the lens support 16 as the 2 nd members sandwich the 1 st moving body plate 22 from both sides in the optical axis direction, and one of the two 2 nd members is the lens support 16 that supports the lens. The extending direction of the 1 st groove 42A of the 1 st guide portion 42 and the 2 nd groove 46A of the 2 nd guide portion 46 provided in the 1 st movable body plate 22 perpendicularly intersect.

Mounting portions 48 are provided at four corners of the 1 st cover 26 to extend downward in the Z direction. A rectangular mounting hole 50 is formed at the mounting portion 48. Further, the 2 nd movable body plate 24 has mounting portions 52 formed at four corners thereof so as to protrude sideways. The mounting hole 50 is fitted into the mounted portion 52, and the 1 st cover 26 is fixed to the 2 nd movable body plate 24.

The 1 st magnet 54 and the 1 st yoke 56 are fixed to the outer side of the lens support 16 on both sides +x and-Y. The 1 st magnet 54 on the +x side has an S pole and an N pole formed in the X direction. Further, the 1 st magnet 54 located on the-Y side is formed with an S pole and an N pole in the Y direction.

The 2 nd magnet 58 and the 2 nd yoke 60 are fixed to the +y side of the 2 nd movable body plate 24. The 2 nd magnet 58 is divided into two parts in the Z direction, and an S pole and an N pole are formed in the Y direction, respectively, and the polarities are formed to be opposite from each other. The magnetic members 86, 86 are fixed to the +x side and the-Y side of the bottom surface of the second moving plate 24, respectively, below the 1 st magnets 54, 54. Thus, the lens support 16 is pulled toward the 2 nd movable body plate 24 together with the 1 st movable body plate 22, and the movable bodies 14 are combined into one piece.

Next, the relationship between the fixed body 12 and the movable body 14 will be described. The fixed body 12 includes a 2 nd housing 62. The 2 nd frame 62 surrounds the 1 st frame 18 of the moving body 14. The 2 nd housing 62 includes a base 64 and a 2 nd cover 66 attached to the base 64. The base 64 and the 2 nd cover 66 are rectangular in top view, and the 2 nd cover 66 is fitted to the outside of the base 64 to constitute the 2 nd frame 62. Further, through holes 72, 74 are formed in the bottom surface portion 68 of the base 64 and the upper surface portion 70 of the 2 nd cover 66 for passing light or inserting lenses.

Further, at four corners of the base 64, leg portions 76 which sandwich the corner portions and are divided into two are formed so as to stand upward from the bottom surface portion 68. The flexible wiring board 78 is disposed outside the base, and surrounds the pillar portion 76. The flexible wiring board 78 is bent into a rectangular shape to enclose the outer shape of the base 64, and is fixed to the pillar portion 76, under which the terminal portion 80 is formed. The terminal portion 80 can control the energization of the 1 st coil 82 and the 2 nd coil 84 described later, but is not limited thereto.

The 1 st coil 82 is fixed to +x side and-Y side inside the flexible wiring board 78. Further, the 2 nd coil 84 is fixed to the +y side inside the flexible wiring board 78. The 1 st coil 82 faces the first magnet 54, and the 2 nd coil 84 faces the 2 nd magnet 58.

Further, a magnetic member 86 made of a magnetic material is provided on the outside of the +y side of the flexible printed circuit board 78. The magnetic member 86 faces the 2 nd magnet 58 with the flexible printed circuit 78 and the 2 nd coil 84 interposed therebetween. Because a magnetic flux flows from the 2 nd magnet 58 through the magnetic member 86, an attractive force is generated between the 2 nd magnet 58 and the magnetic member. Therefore, an attractive force acts on the moving body 14 in the +y direction toward the fixed body 12.

The movable body 14 is supported by the optical axis direction support mechanism 88 to be freely movable in the Z direction with respect to the fixed body 12. The optical axis direction supporting mechanism 88 is constituted by a main guide shaft 90 and a sub guide shaft 92 provided on the base 64, and a guide hole 94 and a guide wall 96 provided on the moving body 14. By energizing the 2 nd coil 84, the movable body 14 moves in the Z direction with respect to the fixed body 12 together with the lens support body 16.

In the above configuration, if current is applied to the 1 st coil 82 facing the +x 1 st magnet 54, a lorentz force in the X direction acts on the 1 st coil 82. Since the 1 st coil 82 is fixed to the base 64, the reaction force acting on the 1 st magnet 54 becomes a driving force for the lens support 16 and the 1 st movable body plate 22, and the lens support 16 and the 1 st movable body plate 22 are supported by the 1 st guide mechanism 36 to move in the X direction.

In the 1 st guide mechanism 36, the 1 st guide portion 42 slides with the 1 st support portion 40. Since the 1 st guide portion 42 is made of metal and the 1 st support portion 40 is made of resin, the coefficient of friction can be kept small and sliding with each other is smooth.

Further, if current is applied to the 1 st coil 82 facing the 1 st magnet 54 on the-Y side, a lorentz force in the Y direction acts on the 1 st coil 82. Since the 1 st coil 82 is fixed to the base 64, the reaction force acting on the first magnet 54 becomes a driving force for the lens support 16, and the lens support 16 is supported by the 2 nd guide mechanism 38 to move in the Y direction.

In the 2 nd guide mechanism 38, the 2 nd guide portion 46 slides with the 2 nd support portion 44. Since the 2 nd guide portion 46 is made of metal and the 2 nd support portion 44 is made of resin, the coefficient of friction can be kept small and sliding with each other is smooth.

After the lens support 16 moves in at least one of the X direction and the Y direction, the current supply to the 1 st coil 82 is stopped. Then, the lens support body 16 is stopped at a position where energization is stopped due to attraction between the first magnets 54, 54 and the magnetic members 86, 86 and friction between the 1 st guide portion 42 and the 1 st support portion 40, and between the 2 nd guide portion 46 and the 2 nd support portion 44.

In the first embodiment described above, the 1 st guide portion 42 and the 2 nd guide portion 46 are formed on the 1 st moving body plate 22 made of metal. In contrast, the example in which the 1 st support portion 40 is formed on the 2 nd movable body plate 24 made of resin and the 2 nd support portion 44 is formed on the lens support 16 made of resin has been described. The 1 st guide portion 42 and the 2 nd guide portion 46 are formed of a metal member, and the 1 st support portion 40 and the 2 nd support portion 44 are formed of a resin member. Therefore, the friction coefficient between the 1 st guide portion 42 and the 1 st support portion 40 and between the 2 nd guide portion 46 and the 2 nd support portion 44 is kept small, and the friction force is also small, so that smooth sliding is possible. With this structure, the coefficient of friction is about 0.2 if the resin members slide against each other, even if a lubricant is used, whereas the coefficient of friction is about 0.1 if the metal and the resin members slide against each other. Because of the small friction, the required driving force is also smaller than that of a structure without resin and metal sliding surfaces, so that the driving power consumption can be reduced.

Further, since the entire 1 st movable body plate 22 is made of metal, the thickness in the Z direction can be reduced, and the entire lens driving apparatus 10 can be made thinner.

As a modification shown in fig. 10, a slit 22A may be provided between the 1 st guide 42 and the 2 nd guide 46, and the slit may extend in the XY direction as a gap and may be connected to the main body portion of the 1 st movable body plate 22 only on one predetermined side. As described in the second embodiment, the portion of the 1 st moving body plate 22 where the 1 st guide portion 42 and the 2 nd guide portion 46 are provided is elastically deformed to soften the impact when the impact is received, and damage to the 1 st support portion 40 and the 2 nd support portion 44 can be reduced.

Second embodiment

In the first embodiment, the case where the 1 st movable body plate 22 is constituted by a single metal member cast by die casting of an aluminum alloy or the like has been described, but the present invention is not limited to the above embodiment. The 1 st moving body plate may be integrally formed of two metal plate bodies as in the second embodiment described below. In this case, the 1 st guide portion is formed in one of the two metal plates, and the 2 nd guide portion is formed in the other of the two metal plates. Next, a lens driving apparatus 10' according to a second embodiment will be described with reference to fig. 11 to 14. The lens driving apparatus 10' of the second embodiment is different from the lens driving apparatus 10 of the first embodiment only in the structure of the 1 st moving body plate 98, and the other parts are identical in structure. Therefore, the same structures are denoted by the same reference numerals and detailed description thereof is omitted.

As shown in fig. 11 and 12, the 1 st movable body plate 98 is formed by overlapping two metal plate bodies in the Z direction, the lower metal plate 100 is located on the-Z side, and the upper metal plate 102 is located on the +z side. The lower metal plate 100 and the upper metal plate 102 have a substantially rectangular shape, and the 1 st guide portions 104 are formed at the four corners of the lower metal plate 100, and the 2 nd guide portions 106 are formed at the four corners of the upper metal plate 102.

The upper metal plate 102 and the lower metal plate 100 are integrally formed by welding, crimping, screw fixing, bonding, or other fixing means, except for the 1 st guide 104 and the 2 nd guide 106. Further, as described below, the lower side metal plate 100 in the 1 st guide portion 104 and the upper side metal plate 102 in the 2 nd guide portion 106 overlap each other, and a gap is provided in the optical axis direction.

Of the 1 st guide portions 104, the 1 st guide portion 104 provided at both ends of the side on the-Y side where the 1 st magnet 54 and the magnetic member 86 are provided is formed as a V-shaped 1 st groove 104A, and the 1 st groove 104A extends in the X direction. The 1 st guide portion provided at both ends of the +y side in the opposite direction is formed as a 1 st sliding plane 104B, and the 1 st sliding plane 104B extends in the X-Y plane. The 1 st groove 104A is formed to be recessed in the +z direction directly from the plate surface of the lower metal plate 100, and the 1 st sliding plane 104B is formed to be recessed in the +z direction from the plate surface of the lower metal plate 100. The 1 st groove 104A of the 1 st guide 104 is connected to the main body portion of the 1 st movable body plate 98 only on the +y side. The 1 st sliding plane 104B of the 1 st guide 104 is connected to the main body portion of the 1 st moving body plate 98 only on the-Y side. The 1 st sliding plane 104B is located at a position shallower than the groove depth of the 1 st groove 104A. The 1 st groove 104A and the 1 st sliding plane 104B are formed by bending the plate-shaped lower metal plate 100.

The two 1 st support portions 40A on the Y side are fitted into the 1 st groove 104A, and the two 1 st support portions 40B on the +y side are in contact with the 1 st sliding plane 104B. Since the 1 st groove 104A extending in the X direction is fitted to the 1 st support portion 40A, movement in the Y direction is restricted, and thus the 1 st moving body plate 98 is free to move only in the X direction relative to the 2 nd moving body plate 24. In the above-described example, the 1 st groove 104A is formed as a V-groove, but may be formed as a U-groove.

Further, in the 2 nd guide 106, the 2 nd guide 106 provided at both ends of the +x side provided with the 1 st magnet 54 and the magnetic member 86 is formed as a V-shaped 2 nd groove 106A, and the 2 nd groove 164A extends in the Y direction. The 2 nd guide 106 provided at both ends of the side of the-X side in the opposite direction is formed as a 2 nd sliding plane 106B, and the 2 nd sliding plane 106B extends in the X-Y plane. These 2 nd guide portions 106 are formed as protruding portions protruding in a trapezoid in the +z direction from the plate surface of the upper metal plate 102. The protruding portion is formed by bending a plate-shaped upper metal plate 102. Further, the 2 nd groove 106A is formed by bending the protruding portion further. The 2 nd sliding surface 106B is a flat surface of the protruding portion. Further, the 2 nd grooves 106A of the 2 nd guide 106 are each connected to the main body portion of the 1 st moving body plate 98 only on the-X side. The 2 nd sliding plane 106B of the 2 nd guide 106 is connected to the main body portion of the 1 st moving body plate 98 only on the +x side. The position of the 2 nd sliding plane 106B is located at a position shallower than the groove depth of the 2 nd groove 106A.

The two 2 nd support portions 44A on the +x side are fitted into the 2 nd grooves 106A, and the two 2 nd support portions 44B on the-X side are in contact with the 2 nd sliding plane 106B. Since the 2 nd groove 106A extending in the Y direction is fitted to the 2 nd support portion 44A, movement in the X direction is restricted, and therefore the lens support 16 is free to move only in the Y direction with respect to the 1 st movable body plate 22. Thus, the lens support 16 is free to move in the X-direction and the Y-direction with respect to the 2 nd movable body plate 24. The 2 nd groove 106A is formed as a V-groove in the example described above, but may be formed as a U-groove.

As described above, the lower metal plate 100 in the 1 st guide portion 104 and the upper metal plate 102 in the 2 nd guide portion 106 overlap each other, and a gap is provided in the optical axis direction. This enables at least one of the 1 st guide portion 104 and the 2 nd guide portion 106 to bend and absorb an impact when receiving the impact, thereby reducing damage to the 1 st support portion 40 and the 2 nd support portion 44 made of resin.

Specifically, the groove depth of the 1 st groove 104A and the groove depth of the 2 nd groove 106A and the height of the protruding portion are determined so that the lower side metal plate 100 and the upper side metal plate 102 do not contact. These dimensions are determined in consideration of not only dimensional tolerances but also dead weight and deflection due to attractive force between the 1 st magnet 54 and the magnetic member 86, deflection in normal use, and deflection due to impact. For other parts, the 1 st sliding plane 104B is located at a position shallower than the groove depth of the 1 st groove 104A, and the 2 nd sliding plane 106B is located at a position shallower than the groove depth of the 2 nd groove 106A, so that a sufficient pitch can be necessarily ensured.

The operation of the orthogonal direction guide mechanism 34 of the second embodiment described above in the X-Y direction is substantially the same as that of the orthogonal direction guide mechanism 34 of the first embodiment, and therefore, a detailed description thereof will be omitted. It is assumed that a +z direction force is applied to the orthogonal direction guide mechanism 34 of the second embodiment described above. That is, in this case, the 2 nd movable body plate 24 pushes the 1 st movable body 98 in the +z direction, and the 1 st movable body plate 98 pushes the lens support 16 in the +z direction. In the 1 st guide mechanism 36, the 1 st support 40A on the-Y side is fitted into the 1 st groove 104A, and the 1 st support 40B on the +y side is in contact with the 1 st sliding plane 104B, so that the 1 st support portion 40 of the 2 nd movable body plate 24 bends and deforms the lower side metal plate 100, which forms part of the 1 st guide portion 104, in the +z direction.

In addition, in the 2 nd guide mechanism 38 of the orthogonal direction guide mechanism 34, in a state in which the +x side 2 nd support portion 44A is fitted into the 2 nd groove 106A and the-X side 2 nd support portion 44B is in contact with the 2 nd slide plane 106B, the upper side metal plate 102 forming part of the 2 nd guide portion 106 is deformed while being bent in the-Z direction, and pushes the 2 nd support portion 44 of the lens support 16.

At this time, a gap exists between the lower metal plate 100 of the portion where the 1 st guide portion 104 is formed and the upper metal plate 102 of the portion where the 2 nd guide portion 106 is formed. Therefore, the lower side metal plate 100 of the portion forming the 1 st guide portion 104 can be bent and deformed in the +z direction, and the upper side metal plate 102 of the portion forming the 2 nd guide portion 106 can be bent and deformed in the-Z direction without contact with each other. Therefore, the 1 st guide portion 104 and the 2 nd guide portion 106 can be sufficiently elastically deformed, and can absorb an impact. Further, when a force in the-Z direction is applied, the deformation occurs, and the gap between the lower metal plate 100 of the portion where the 1 st guide portion 104 is formed and the upper metal plate 102 of the portion where the 2 nd guide portion 106 is formed becomes narrower.

Further, the 1 st guide 104 and the 2 nd guide 106 may not overlap when viewed from the Z direction. As shown in the modified example of fig. 15, the 1 st guide portion 104 and the 2 nd guide portion 106 are provided at the four corners of the rectangular 1 st moving body plate 98, respectively. However, since the 1 st guide 104 is disposed at both ends of the ±x side and the 2 nd guide 106 is disposed at both ends of the ±y side, the two parts do not overlap. A slit 98A is provided between each of the 1 st guide 104 and the 2 nd guide 106 and the main body portion of the 1 st moving body plate 98. Thus, the 1 st guide 104 forming the 1 st groove 104A is connected to the main body portion of the 1 st movable body plate 98 only on the +y side, and the 1 st guide 104 forming the 1 st sliding plane 104B is connected to the main body portion of the 1 st movable body plate 98 only on the-Y side. Further, the 2 nd guide 106 forming the 2 nd groove 106A is connected to the main body portion of the 1 st moving body plate 98 only on the-X side, and the 2 nd guide 106 forming the 2 nd sliding plane 106B is connected to the main body portion of the 1 st moving body plate 98 only on the +x side.

In this modification, the two metal plate bodies do not need to be integrated, and may be formed by, for example, press working from a single metal plate body. Further, by not overlapping the 1 st guide portion 104 and the 2 nd guide portion 106, the restriction in the height direction is eliminated, and the plate surface of the metal plate body can be directly used as the 1 st slide plane 104B and the 2 nd slide plane 106B, so the 1 st slide plane 104B and the 2 nd slide plane 106B are the same in height as the main body portion of the 1 st moving body plate 98. Therefore, the 1 st groove 104A and the 2 nd groove 106A can be formed without providing a protruding portion. That is, the 1 st guide 104 and the 2 nd guide 106 extend from the main body portion of the 1 st moving body plate 98 in the in-plane direction thereof without providing a protruding portion. The 1 st movable body plate 98 according to the present modification example may be manufactured by other methods such as casting.

The above embodiment has been described with respect to the lens driving device 10 used in a camera device mounted in an electronic apparatus such as a mobile phone or a smart phone, but the present invention is also applicable to other devices.

Further, the above embodiment has described a case where the groove of the guide mechanism is made of metal, the protrusion fitted into the groove is made of resin, and the guide mechanism is applied to an orthogonal direction guide mechanism for camera shake compensation that moves the lens support in a direction intersecting perpendicularly with the optical axis direction of the lens. The present invention is also applicable to, for example, an autofocus optical axis direction supporting mechanism that supports the fixed body 12 and the movable body 14 that moves relative to the fixed body 12 in the lens optical axis direction. For example, the present invention can be applied to an orthogonal direction guide mechanism for camera shake compensation, which uses an image sensor as an optical element and moves the optical element in a direction perpendicular to an optical axis.

For example, in the former case, the guide mechanism is formed on the metal 1 st member including a groove extending in the Z direction and a sliding plane extending in the ZX direction, instead of the optical axis direction support mechanism 88, and the resin 2 nd member is provided with a support portion formed as a protrusion. The 1 st component may be a fixed body 12, and the 2 nd component may be a movable body 14.

Claims (10)

1. An optical element driving device, characterized in that:

the device is provided with: a guide mechanism for guiding the movement of the optical element;

the guide mechanism is provided with a guide part comprising a groove and a sliding plane formed on a 1 st part made of metal and a supporting part with a plurality of protrusions formed on a 2 nd part made of resin;

a part of the protrusions of the plurality of protrusions made of the resin are embedded in the grooves made of the metal, the remaining protrusions of the plurality of protrusions are in contact with the sliding plane made of the metal, and the supporting portion and the guiding portion slide.

2. The optical element driving device according to claim 1, wherein:

having one of said 1 st and two of said 2 nd parts;

the one 1 st member includes the guide portion on both sides in an optical axis direction of the optical element, and an extending direction of the groove provided on one side in the optical axis direction of the guide portion and an extending direction of the groove provided on the other side in the optical axis direction are orthogonal to each other;

the two 2 nd members sandwich the 1 st member from both sides in the optical axis direction, and have a support body for supporting the optical element on one of them.

3. An optical element driving apparatus according to claim 2, wherein:

the shape of the plate-shaped 1 st part is rectangular;

one of the guide portions provided on both sides in the optical axis direction is formed on a surface of a projection portion protruding in a trapezoid shape in the optical axis direction from the plate-like plate surface at four corners of the rectangular 1 st member.

4. An optical element driving apparatus according to claim 3, wherein: the other of the guide portions is formed on the rear surface of the protrusion portion.

5. The optical element driving device according to claim 1, wherein: the 1 st part is formed by integral molding.

6. An optical element driving apparatus according to claim 2, wherein: the 1 st member is formed by fixing two metal plate bodies, one of the guide portions provided on both sides in the optical axis direction is formed on one of the two metal plate bodies, and the other of the guide portions provided on both sides in the optical axis direction is formed on the other of the two metal plate bodies.

7. The optical element driving device according to claim 6, wherein:

the two metal plate bodies are rectangular in appearance;

one of the guide portions provided on both sides in the optical axis direction is formed on a surface of a projection portion protruding in a trapezoid from a plate-like plate surface in the optical axis direction at four corners of one of the metal plate bodies.

8. A photographic apparatus comprising the optical element driving device according to claim 1 and a lens as the optical element.

9. A photographic apparatus provided with the optical element driving device according to claim 1 and an image sensor as the optical element.

10. An electronic apparatus provided with the camera device according to any one of claims 8 or 9.