CN118050871A - Optical element driving device, photographing device and electronic equipment - Google Patents

Abstract

The application provides an optical element driving device, a camera device and an electronic device, which are not easy to damage when being subjected to dropping impact and can ensure that parts for holding optical elements such as an image sensor and the like move smoothly. The optical element driving device includes: the image sensor device includes a plate-shaped base, a box-shaped sub-base fixed to a box-shaped housing fixed thereto, a lens holder supported in the sub-base so as to be movable in an optical axis direction of the lens, a sensor holder which holds the image sensor and is supported by a vertical intersecting direction guide mechanism so as to be movable relative to the base in two directions intersecting perpendicularly to the optical axis direction and intersecting perpendicularly to each other, and a slider. The vertical intersecting direction guide mechanism includes a metal guide groove and a guide plane formed on both surfaces of the slider, and resin support protrusions formed on the rear surface of the sensor holder and the front surface of the base, respectively, each of the support protrusions being in contact with either one of the corresponding guide groove or guide plane.

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 ]

Among camera devices mounted on smart phones, tablet mobile terminals, and the like, some have both an Auto Focus (AF) function and an optical camera shake compensation (OIS) function. In particular, there is a structure in which camera shake compensation is achieved by moving the image sensor in a direction perpendicular to the optical axis direction of the lens.

For example, in the photographic apparatus disclosed in patent document 1 below, a 2 nd substrate to which an image sensor is coupled is supported by a ball received in a groove formed in a fixed 1 st substrate so as to be movable in a direction perpendicular to the optical axis direction of a lens.

In the camera module disclosed in patent document 2, the image sensor is movable in a direction perpendicular to the optical axis direction of the lens, and a sensor cover on which the image sensor is mounted is suspended from the fixing portion by 4 suspension wires.

Also, if the ball as described above is used, there is a problem in that: when the ball is impacted by falling or the like, the ball is in point contact with the inner surface of the groove, so that a depression is generated in the groove by the impact. Further, if a structure using a suspension wire, there is a problem in that: since the strength of the wire is low, the wire itself may be broken when the wire is impacted by a drop or the like.

[ Prior Art literature ]

[ Patent literature ]

JP-A2021-529444 (patent document 1)

JP-A2021-99417 (patent document 2)

[ Invention ]

The present invention has been made to solve the above-described problems, and an object of the present invention is to provide an optical element driving device, a camera device, and an electronic apparatus, which are less likely to be damaged when they are subjected to a drop impact, and which can ensure smooth movement of a member holding an optical element such as an image sensor.

[ Technical solution ]

One embodiment of the present invention is an optical element driving device including: the image sensor device includes a plate-shaped base, a box-shaped sub-base fixed to a front plate of a box-shaped housing fixed to the base, a lens holder supported in the sub-base so as to be movable in an optical axis direction of a lens, a sensor holder which holds an image sensor and is supported by a vertical intersecting direction guide mechanism so as to be movable relative to the base in two directions intersecting the optical axis direction perpendicularly and intersecting each other perpendicularly, and a slider arranged between the sensor holder and the base. The vertical intersecting direction guide mechanism includes a metal guide groove and a guide plane formed on the front side surface and the rear side surface of the slider, and a plurality of resin support protrusions formed on the rear side surface of the sensor holder and the front side surface of the base, respectively, each of the support protrusions being in contact with either one of the guide groove or the guide plane.

Preferably, the sensor holder holds the image sensor fixed to the 1 st flexible printed board, and the 1 st flexible printed board has a flat plate portion intersecting perpendicularly with the optical axis direction and on which the image sensor is mounted, and a belt-shaped portion extending from an edge portion on one side of the flat plate portion in the optical axis direction and fixing the periphery of the sensor holder to an edge portion on the opposite side of the flat plate portion on the base.

Preferably, the sensor holder has a bottom plate portion having a through hole in the center thereof and a side plate portion rising forward from the middle of the outer and inner edges of the bottom plate portion, the band portion being located between the outer edge and the side plate portion of the bottom plate portion.

Preferably, the outer edge of the bottom plate portion is provided with a recess toward the inside, the flat plate portion is attached to the rear side surface of the sensor holder, and the band portion extending from the edge portion on one side of the flat plate portion in the optical axis direction passes through the recess.

Preferably, 3 sides of the outer edge of the bottom plate portion are provided with convex portions protruding toward the front side, and the rear end of the band portion is located further toward the rear side than the front end of the convex portions.

Preferably, an FPC fixing wall is vertically provided on an edge of the base opposite to an edge other than the outer edges of the 3 edges, and the band portion is fixed to an outer side surface of the FPC fixing wall.

Preferably, a2 nd flexible printed board is disposed so as to surround the outer sides of the 3 sides of the sub-base, the sub-base has a side wall surrounding the outer sides of the 3 sides of the lens holder, a 1 st coil and a2 nd coil are disposed on 2 surfaces adjacent to the outer sides of the 2 nd flexible printed board at positions outside the side wall, and a 3 rd coil is disposed on the inner surface of the 2 nd flexible printed board at positions without the side wall.

Preferably, the 2 nd flexible printed circuit board is electrically connected to the outside through a through hole provided in the front plate of the case.

Preferably, the 3 rd magnet is disposed on the lens holder so as to face the 3 rd coil, the 1 st magnet is disposed on the sensor holder so as to face the 1 st coil, and the 2 nd magnet is disposed so as to face the 2 nd coil.

Suitably, the sensor further comprises a 4 th magnet fixed to the sensor holder, and a 4 th yoke fixed to the base and opposed to the 4 th magnet, wherein recesses are formed on two adjacent sides of the upper outer peripheral portion of the slider, and the 4 th yoke is fixed in the recesses.

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

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

[ Beneficial effects ]

According to the present invention, the sensor holder includes a metal guide groove and a guide plane formed on the front side surface and the rear side surface of the slider, and a plurality of resin support protrusions formed on the rear side surface of the sensor holder and the front side surface of the base, respectively, each of the support protrusions being in contact with either one of the corresponding guide groove or guide plane. Therefore, even if an impact is applied, the metal guide groove and the guide plane are not damaged, and the resin support protrusion is elastically deformed and restored, so that there is little damage. In addition, the friction coefficient can be kept small by the contact of the metal and the resin. Therefore, the optical element is not easily damaged when dropped and impacted, and smooth movement of the component holding the optical element such as the image sensor can be ensured.

[ Description of the drawings ]

Fig. 1 (a) is a perspective view of an optical element driving device according to an embodiment of the present invention from the front side, and fig. 1 (B) is a perspective view of an optical element driving device from the rear side.

Fig. 2 is a perspective view showing a state in which the housing is removed from the perspective view of fig. 1.

Fig. 3 is an exploded perspective view of an optical element driving device according to an embodiment of the present invention, as seen from the obliquely front side.

Fig. 4 is an exploded perspective view of an optical element driving device according to an embodiment of the present invention, as seen from the rear side.

Fig. 5 is an exploded perspective view of the optical element driving device according to the embodiment of the present invention, which is taken obliquely from the front.

Fig. 6 (a) is an oblique view of the slider according to the embodiment of the present invention from the front, and fig. 6 (B) is an oblique view of the slider from the rear.

Fig. 7 is a plan view of an optical element driving device according to an embodiment of the present invention.

Fig. 8 (a) is a sectional view taken along line VIIIA-VIIIA of fig. 7, and fig. 8 (B) is a sectional view taken along line VIIIB-VIIIB of fig. 7.

Fig. 9 (a) is a cross-sectional oblique view of the cross-section of fig. 8 (a) from the obliquely front, and fig. 9 (B) is a cross-sectional oblique view of the cross-section of fig. 8 (B) from the obliquely front.

Fig. 10 (a) is a cross-sectional view taken along line XA-XA of fig. 7, and fig. 10 (B) is a cross-sectional view taken along line XB-XB of fig. 7.

Fig. 11 (a) is a perspective view of a slider according to a modification from the front, and fig. 11 (B) is a perspective view of a slider according to a modification from the rear.

[ Number Specification ]

10. Optical element driving device

12. Shell body

14. Auxiliary base

16. Lens holder

18. Optical axis direction guiding mechanism

20. Base seat

22. Perpendicular crossing direction guiding mechanism

24. Sensor support

26 1 St flexible printed circuit board (1 st FPC)

28. Image sensor

30. Front plate

32. Through hole

34. Side wall

36. Through hole

38. Bottom plate

40. Side wall

42. An opening part

44. Through hole

46. Mounting projection

48. Mounting hole

50. Fixing hole

52. Guide shaft

54. Guide hole

56. Bottom plate

58. Fixing convex part

60 FPC fixing wall

62. Through hole

64 Th yoke fixing portion

66 No. 4 magnetic yoke

68. Bottom cover

70. Through hole

72. Bottom plate part

72A recess

72B convex part

74. Side plate portion

76 Th magnet fixing part

78 Th magnet

80. Flat plate part

82. Terminal part

84. Band-shaped part

88 St guide mechanism 1

90 Nd guide mechanism

92 St guide portion 1

92A 1 st guide groove

92B 1 st guiding plane

94 St support part 1

94A, 94B 1 st support protrusion

96 Sliding block

98 Nd guide portion

98A 2 nd guide groove

98B 2 nd guide plane

100 Nd support part

100A, 100B 2 nd support protrusion

102A through hole

102B recess

104 St magnet

106 Nd magnet

108 1 St yoke

110 Nd yoke

112 3 Rd magnet

114 3 Rd yoke

116 Nd flexible printed circuit board (2 nd FPC)

118 1 St coil

120 Nd coil 2

122 3 Rd coil

124 Th yoke 5

126. Input/output unit

128 Y-direction position detecting element

130 X-direction position detecting element

132 Z-direction position detecting element

134. Sliding block

136. Rear side metal plate

138. Front side metal plate

140. Through hole

142. Concave part

144 1 St guide portion

144A 1 st guide groove

144B 1 st guiding plane

146 Nd guide part

146A No. 2 guide groove

146B 2 nd guide plane

[ Detailed description ] of the invention

Embodiments of the present invention will be described below with reference to the accompanying drawings. The following embodiments are examples of the image sensor driving device, the camera device, and the electronic apparatus of the present invention, and are not intended to limit the present invention to the following embodiments.

Fig. 1 to 10 show an embodiment of an optical element driving device 10 according to the present invention. The optical element driving device 10 houses a lens (not shown) and an image sensor 28, and is used for a camera device mounted in an electronic device such as a smart phone.

In the following description, a direction parallel to the optical axis of a lens (not shown) is referred to as an optical axis direction or a Z direction, and two directions intersecting perpendicularly to the Z direction and intersecting perpendicularly to each other are referred to as an X direction and a Y direction. In the Z direction, the image sensor 28 side is the-Z side or the rear side with the object side being the +z side or the front side. In the following description, reference is made mainly to fig. 3 and 4, and the numbers of the drawings are added as needed.

The optical element driving device 10 includes a base 20, a housing 12 fixed to the base 20, a sub-base 14 fixed to the housing 12, and a lens holder 16 disposed inside the sub-base 14. The lens holder 16 holds a lens (not shown) and is supported so as to be movable in the optical axis direction of the lens.

The optical element driving device 10 further includes: a sensor holder 24 supported so as to be movable in a perpendicular intersecting direction perpendicular to the optical axis direction, and a slider 96 disposed between the sensor holder 24 and the base 20. The sensor holder 24 holds the image sensor 28 fixed to the 1 st flexible printed board (hereinafter referred to as 1 st FPC (flexible printed circuit)) 26.

As shown in fig. 1 (a) and 1 (B), the case 12 is formed in a box shape having a front plate 30 having a nearly rectangular shape as viewed in the Z direction and a side wall 34 extending in the-Z direction from the periphery thereof, and the front plate 30 is formed with a through hole 36 for passing light therethrough and 4 attachment holes 48 formed around the through hole 36.

The sub-base 14 is formed in a box shape having a bottom plate 38 which is nearly rectangular in view of the Z direction and side walls 40 extending in the +z direction from edges of 3 sides of the bottom plate 38 other than the-Y side. The lens holder 16 is housed in a space surrounded by the bottom plate 38 and the side walls 40. the-Y side of the sub-base 14 is an opening 42. The bottom plate 38 is formed with a through hole 44 for passing light therethrough. Mounting projections 46 are formed at the front ends of the four corners of the side wall 40, and the sub-base 14 is fixed to the housing 12 by fitting with mounting holes 48.

The lens holder 16 has a rectangular parallelepiped shape, and a circular through hole 32 having a lens (not shown) attached thereto is formed so as to pass through from the front side to the rear side. The lens holder 16 is formed of resin. A plate-shaped 3 rd magnet 112 and a3 rd yoke 114 are fixed to the-Y side surface of the lens holder 16. The 3 rd magnet 112 is divided into a front side and a rear side in the Z direction, and an S pole and an N pole are provided on the plate surface, and magnetized with their polarities being reversed from each other.

The optical axis direction guide mechanism 18 is composed of 2 guide shafts 52 attached to fixing holes 50 provided at both end portions of the bottom plate 38 of the sub-base 14 on the-Y side, and guide holes 54 provided at both end portions of the lens holder 16 on the-Y side in correspondence with the guide shafts 52 and inserted.

The guide shaft 52 has a cylindrical shape extending in the Z direction, and is formed of, for example, ceramic or metal. When formed of metal, the sub-mount 14 is formed by insert molding, and can be fixed to the insert metal by welding or the like.

The guide hole 54 is formed as a hollow through hole penetrating from the front to the rear of the lens holder 16. The cross-sectional shape of the guide hole 54 on the-X side in the X-Y direction is V-shaped with its +y side portion open toward the-Y side, and its-Y side portion is square. The cross-sectional shape of the Y-side portion may also be semi-circular. The guide holes 54 are in line contact with the outer surface of the guide shaft 52 at two points of the V-shape. This makes it possible to accurately position the lens holder 16 in the X-direction and the Y-direction with respect to the sub-base 14.

The guide hole 54 located on the +x side includes at least two wall surfaces facing each other in the Y direction in a cross section in the X-Y direction. The two walls protrude in a curved shape so that the central portion in the Z direction is closest, and the outer surface of the guide shaft 52 is in point contact with the central portion in the Z direction of the wall surface on the +y side at 1 point, so that frictional resistance can be reduced. With this structure, the lens holder 16 is supported so as to be movable in the optical axis direction with respect to the sub-base 14.

The 2 nd flexible printed board (hereinafter referred to as 2 nd FPC (flexible printed circuit)) 116 is disposed to enclose the outer sides of 3 sides of the sub-base 14. The 2 nd FPC116 is bent into a U shape, and is disposed outside the +y side wall 40, outside the +x side wall 40, and the-Y side opening 42 of the sub-chassis 14. The 2 nd FPC116 has an input/output portion 126 drawn out in the-Y direction from the front portion on the-Y side through the through hole 36 of the housing 12, and supplies current, outputs signals, and the like through the input/output portion 126.

The first coil 118 is fixed to the outer surface of the +y side of the 2 nd FPC116, and the 2 nd coil 120 is fixed to the outer surface of the +x side. A 3 rd coil 122 is fixed to the inner surface of the-Y side of the 2 nd FPC116 so as to face the 3 rd magnet 112. A 5 th yoke 124 is fixed to the outer surface of the-Y side of the 2 nd FPC116 so as to face the 3 rd magnet 112, with the 3 rd coil 122 interposed therebetween. Therefore, attractive force acts between the 3 rd magnet 112 and the 5 th yoke 124, and a force in the-Y direction acts on the lens holder 16, and is pressed against the two guide shafts 52.

A Y-direction position detecting element 128 is disposed inside the winding of the 1 st coil 118, facing the 1 st magnet 104, and an X-direction position detecting element 130 is disposed inside the winding of the 2 nd coil 120, facing the 2 nd magnet 106. A Z-direction position detecting element 132 is disposed inside the 2 nd FPC116 at a position adjacent to the 3 rd coil 122, and faces the 3 rd magnet 112.

The base 20 includes a bottom plate 56 having a nearly rectangular shape as viewed in the Z direction and having a through hole 62 in the center, a fixing protrusion 58 protruding in the +z direction from the edge of the bottom plate 56, and an FPC fixing wall 60 protruding in the +z direction from the center portion of the-Y side edge of the bottom plate 56 and protruding higher than the fixing protrusion 58. The base 20 is formed of resin. The side wall 34 of the housing 12 is fitted around the fixing projection 58, and the housing 12 and the base 20 are combined together.

As shown in fig. 5, the 4 th yoke fixing portion 64 is formed inside the +x side and +y side fixing protrusions 58, respectively, and the 4 th yoke 66 is fixed. Further, at the four corners of the bottom plate 56, the 1 st support convex portions 94A and 94B of the vertical intersecting direction guide mechanism 22 formed of resin are provided inside the fixing convex portion 58. The base 20 is provided with a bottom cover 68 for closing the through hole 62 from the-Z side.

The sensor holder 24 has a bottom plate portion 72 having a nearly rectangular shape as viewed in the Z direction and having a through hole 70 in the center, and a side plate portion 74 protruding in the +z direction from the middle of the outer edge and the inner edge of the bottom plate portion 72. The image sensor 28 is exposed to the front side through the through hole 70, and the side plate 74 surrounds the sub-mount 14 from the outside. The sensor holder 24 is formed of resin. The sub-base 14 and the components mounted thereon are configured separately from the sensor mount 24 and the components mounted thereon.

A plate-shaped 1 st magnet 104 and a plate-shaped 1 st yoke 108 are fixed to the inner surface of the +y side plate 74, and face the 1 st coil 118. The 1 st magnet 104 is magnetized to have an N-pole or S-pole surface facing the 1 st coil 118. A plate-shaped 2 nd magnet 106 and a plate-shaped 2 nd yoke 110 are fixed to the inner surface of the +x side plate 74, and face the 2 nd coil 120. The 2 nd magnet 106 is magnetized to have an N-pole or S-pole surface facing the 2 nd coil 120. The 4 th magnet fixing portion 76 is formed on the edges of the +x side and +y side of the rear surface of the bottom plate portion 72, and a plate-shaped 4 th magnet 78 facing the 4 th yoke 66 is fixed thereto, so that the sensor holder 24 and the base 20 are attracted to each other.

Concave portions 72A recessed inward are provided on both sides of the 4 th magnet fixing portion 76 on the outer edge of the +y side of the bottom plate portion 72. The corners of the 3 sides of the outer edge other than the-Y side of the bottom plate portion 72 are provided with convex portions 72B protruding in the +z direction. The corners of the outer edge of the bottom plate portion 72 function as stoppers. The 2 nd support convex portions 100A and 100B of the vertical intersecting direction guide mechanism 22 formed of resin are provided at the four corners of the rear side surface of the bottom plate portion 72.

The 1 st FPC26 has a flat plate portion 80 having a substantially rectangular shape as viewed in the Z direction, and a pair of belt portions 84, and the image sensor 28 is mounted on the flat plate portion 80. The band portion 84 extends in the +z direction from the +y side edge of the flat plate portion 80, and extends the outer periphery of the side plate portion 74 of the sensor holder 24 toward the-Y side through the recess 72A. The pair of belt-shaped portions 84 are arranged so as to be symmetrical with respect to a plane parallel to the Y-Z direction through the center of the 1 st FPC26 in the X direction. The front side of the flat plate portion 80 of the 1 st FPC26 is fixed to the rear side of the sensor holder 24, and the band portion 84 is fixed to the outer side of the FPC fixing wall 60 of the base 20. As shown in fig. 9 (a) and 9 (B), the band-shaped portion 84 is spaced from the side plate portion 74 by a gap, and is located between the convex portion 72B on the outer edge of the bottom plate portion 72 and the side plate portion 74, and the rear end of the band-shaped portion 84 is located further rearward than the front end of the convex portion 72B, so that the band-shaped portion 84 has less influence on the movement of the sensor holder 24.

The 1 st FPC26 is led out from the-Z side to the-Y direction of the fixed band portion 84 to form a terminal portion 82, and supplies current, outputs signals, and the like to the image sensor 28 via the terminal portion 82. Accordingly, the 2 nd FPC116 and the 1 st FPC26 are led out in the-Y direction, respectively, and can be connected to the outside only on one side of the optical element driving device 10.

The slider 96 is disposed between the base 20 and the sensor holder 24, and is a plate-like metal member having a nearly rectangular shape as viewed in the Z direction and having a through hole 102A in the center. The slide 96 has a recess 102B recessed toward the-Y side and the-X side on the +y side and the +x side of the outer edge, respectively, and accommodates the 4 th yoke fixing portion 64. The slide block 96 has a 1 st guide groove 92A and a 1 st guide plane 92B formed in four corners of a rear side surface thereof and a2 nd guide groove 98A and a2 nd guide plane 98B formed in four corners of a front side surface thereof, respectively, of the perpendicular intersecting direction guide mechanism 22.

The vertical intersecting direction guide mechanism 22 has a1 st guide mechanism 88 provided on the-Z side and a2 nd guide mechanism 90 provided on the +z side. The 1 st guide mechanism 88 includes a1 st guide portion 92 and a1 st support portion 94. The 1 st guide portion 92 is formed on the rear side surface of the slider 96, and includes a V-shaped 1 st guide groove 92A recessed in the +z direction and extending in the X direction, and a1 st guide plane 92B parallel to the X-Y direction. The 1 st support portion 94 includes a1 st support protrusion 94A corresponding to a1 st guide groove 92A formed on the front side surface of the bottom plate 56 of the base 20 so as to protrude in the +z direction, and a1 st support protrusion 94B corresponding to a1 st guide plane 92B. The 1 st support convex portion 94A has the same shape as the 1 st support convex portion 94B, and the dimension in the X direction is larger than the dimension in the Y direction, and at least the tip portion is entirely in a semi-cylindrical shape, and both ends in the X direction are in a 1/4 spherical shape so as to be smoothly connected to the semi-cylindrical portion.

The 1 st guide groove 92A and the 1 st support protrusion 94A are provided at both ends of the side on the +y side, and the 1 st guide plane 92B and the first support protrusion 94B are provided at both ends of the side on the-Y side. As shown in fig. 10 (a) and 10 (B), in a cross section parallel to the Y-Z plane, the 1 st support protrusion 94A and the 1 st guide groove 92A are in contact with each other at two points and slide, and the 1 st support protrusion 94B and the 1 st guide plane 92B are in contact with each other at one point and slide. In the whole, the 1 st support convex portion 94A and the 1 st guide groove 92A are in line contact and slide at two places, and the 1 st support convex portion 94B and the 1 st guide plane 92B are in line contact and slide at one place. Since the 1 st guide groove 92A and the 1 st support protrusion 94A extending in the X direction are fitted to restrict movement in the Y direction, the slider 96 is movable with respect to the base 20 only in the X direction.

Further, the top of the 1 st support projection 94B in the Z direction is in contact with the 1 st guide plane 92B extending in the X-Y direction. The height of the slider 96 relative to the Z-direction of the base 20 can be determined. Further, the width of the 1 st guide plane 92B in the Y direction is wider than the width of the 1 st support convex 94B in the Y direction. Therefore, even if the dimension between the 1 st support convex portion 94A and the 1 st support convex portion 94B is different from the dimension between the 1 st guide groove 92A and the 1 st guide plane 92B within the tolerance range, it is possible to assemble.

The 2 nd guide mechanism 90 includes a2 nd guide portion 98 and a2 nd support portion 100. The 2 nd guide portion 98 includes a V-shaped groove-shaped 2 nd guide groove 98A formed on a mesa-shaped protrusion protruding in the +z direction on the front side surface of the slider 96, recessed in the-Z direction and extending in the Y direction, and a2 nd guide plane 98B parallel to the X-Y direction. The 2 nd support portion 100 includes a2 nd support convex portion 100A corresponding to a2 nd guide groove 98A formed protruding in the-Z direction on the rear side surface of the sensor holder 24, and a2 nd support convex portion 100B corresponding to the 2 nd guide plane 98B. The 2 nd support convex portion 100A and the 2 nd support convex portion 100B have the same shape, except that the dimension in the Y direction is larger than the dimension in the X direction, and are identical to the 1st support convex portion 94A and the 2 nd support convex portion 94B.

The 2 nd guide groove 98A and the 2 nd support convex portion 100A are provided at both ends of the side on the-X side, and the 2 nd guide plane 98B and the 2 nd support convex portion 100B are provided at both ends of the side on the +x side. As shown in fig. 8 (a), 8 (B), 9 (a), and 9 (B), in a cross section parallel to the Z-X plane, the 2 nd support convex portion 100A and the 2 nd guide groove 98A are in contact with each other at two points, and the 2 nd support convex portion 100B and the 2 nd guide plane 98B are in contact with each other at one point and slide. In general, the 2 nd support protrusion 100A and the 2 nd guide groove 98A are in line contact and slide at two places, and the 2 nd support protrusion 100B and the 2 nd guide plane 98B are in line contact and slide at one place. Since the 2 nd guide groove 98A and the 2 nd support convex portion 100A extending in the Y direction are fitted to restrict movement in the X direction, the sensor holder 24 is movable with respect to the slider 96 only in the Y direction. The sensor holder 24 is movable in the X-direction and the Y-direction with respect to the base 20 by the 1 st guide mechanism 88 and the 2 nd guide mechanism 90.

Further, the top of the 2 nd support convex portion 100B in the Z direction is in contact with the 2 nd guide plane 98B extending in the X-Y direction. The height of the sensor holder 24 relative to the Z-direction of the slide 96 can thus be determined. In addition, the width of the 2 nd guide plane 98B in the X direction is wider than the width of the 2 nd support convex portion 100B in the X direction. Therefore, even if the dimension between the 2 nd support convex portion 100A and the 2 nd support convex portion 100B is different from the dimension between the 2 nd guide groove 98A and the 2 nd guide plane 98B within the tolerance range, it is possible to assemble.

The 1 st guide 92 and the 2 nd guide 98 are made of metal, and the 1 st support 94 and the 2 nd support 100 are made of resin. In this way, a small friction coefficient can be maintained by the contact of the metal with the resin. Therefore, the friction coefficient in the vertical intersecting direction guide mechanism 22 is not easily increased.

The slider 96 having the 1 st guide 92 and the 2 nd guide 98 is formed of a nonmagnetic metal (for example, an aluminum alloy) and is a plate-like member having a predetermined wall thickness. For example, the molten aluminum alloy may be injected into a mold by an aluminum alloy die casting process. In addition, the slider 96 may be formed of a stainless steel alloy. And the surface roughness can be reduced by subjecting the surfaces of the 1 st guide 92 and the 2 nd guide 98 to mirror polishing or chemical polishing, thereby reducing the friction coefficient.

On the other hand, the base 20 and the sensor holder 24 provided with the 1 st support portion 94 and the 2 nd support portion 100 are made of resin, for example, fluorine-containing liquid crystal polymer resin, or the base 20 and the sensor holder 24 may be formed by insert molding and reinforced with metal. In addition, a fluorine-based resin lubricant may be added between the 1 st guide 92 and the 1 st support 94 and between the 2 nd guide 98 and the 2 nd support 100. The slider 96 may be manufactured by a powder metallurgy method, and the metal body such as porous copper may be impregnated with a lubricant.

As shown in fig. 6 (B), the 1 st guide 92 is recessed in the +z direction from the plate surface on the-Z side of the slider 96, and the 1 st guide plane 92B is located at a position shallower than the groove depth of the 1 st guide groove 92A. As shown in fig. 6 (a), the 2 nd guide portion 98 is formed as a projection projecting in a mesa shape in the +z direction from the +z side plate surface of the slider 96, and the 2 nd guide plane 98B is positioned at a position shallower than the groove depth of the 2 nd guide groove 98A. Further, the extending directions of the 1 st guide groove 92A and the 2 nd guide groove 98A provided on the slider 96 perpendicularly intersect.

In the above configuration, when the 1 st coil 118 is energized, electromagnetic force in the Y direction is generated, and the sensor holder 24 is guided by the 2 nd guide mechanism 90 to move in the Y direction with respect to the slider 96. When the energization of the first coil 118 is stopped, the sensor holder 24 is stopped at this position by the attractive force between the 4 th magnet 78 and the 4 th yoke 66, friction of the 2 nd guide mechanism 90, and the like.

When the 2 nd coil 120 is energized, electromagnetic force in the X direction is generated, and the sensor holder 24 moves in the X direction together with the slider 96 by being guided by the 1 st guide mechanism 88. When the energization of the 2 nd coil 120 is stopped, the sensor holder 24 and the slider 96 are stopped at this position due to the attractive force between the 4 th magnet 78 and the 4 th yoke 66, friction between the 1 st guide mechanism 88, and the like.

When the third coil 122 is energized, an electromagnetic force in the Z direction is generated, and the lens holder 16 is guided by the optical axis direction guide mechanism 18 to move in the Z direction. When the current supply to the 3 rd coil 122 is stopped, the lens holder 16 is stopped at this position by the attractive force between the 3 rd magnet 112 and the 5 th yoke 124, friction of the optical axis direction guide mechanism 18, and the like.

When the optical element driving device 10 receives an impact in the Z direction, the 1 st guide 92 and the 1 st support 94 and the 2 nd guide 98 and the 2 nd support 100 are separated by a small distance and immediately return to the original positions. Since the 1 st guide mechanism 88 and the 2 nd guide mechanism 90 are in line contact with each other, the 1 st guide portion 92 and the 2 nd guide portion 98 made of metal are not damaged, and the 1 st support portion 94 and the 2 nd support portion 100 made of resin are elastically deformed and restored, so that there is little damage. Further, the guide shaft 52 and the guide hole 54 are maintained in contact, respectively, and thus are hardly damaged.

In addition, when the optical element driving device 10 receives an impact in the X direction or the Y direction, since the 1 st guide portion 92 and the 1 st support portion 94, and the 2 nd guide portion 98 and the 2 nd support portion 100 are substantially maintained in contact, there is little damage. Further, even if the guide shaft 52 and the guide hole 54 are separated, they are separated by a minute distance and immediately return to the original positions. At this time, since the guide hole 54 is made of resin, elastic deformation occurs, and thus the guide shaft 52 and the guide hole 54 are hardly damaged.

Modification example

The above embodiment describes the case where the slider 96 is constituted by a single metal member cast by aluminum alloy die casting or the like, but the present invention is not limited to the above embodiment. The slider 96 may be a slider 134 formed by integrating two metal plates, one of which is provided with the 1 st guide portion and the other of which is provided with the 2 nd guide portion, as a modification described below. The optical element driving device according to the modification differs from the optical element driving device 10 according to the embodiment only in the structure of the slider 134, 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 (a) and 11 (B), the slider 134 is formed by overlapping two metal plates, i.e., a rear metal plate 136 disposed on the-Z side and a front metal plate 138 disposed on the +z side, in the Z direction. The rear side metal plate 136 and the front side metal plate 138 have a nearly rectangular shape, a nearly rectangular through hole 140 is formed in the central portion, and concave portions 142 are formed on one side of the outer peripheral portion on the +y side and one side of the outer peripheral portion on the +x side, respectively, corresponding to the concave portions 102B. Further, the 1 st guide portions 144 are formed at the four corners of the rear side metal plate 136, and the 2 nd guide portions 146 are formed at the four corners of the front side metal plate 138.

The front side metal plate 138 and the rear side metal plate 136 are integrally formed by welding, crimping, screw fixing, bonding, or other fixing means, except for the 1 st guide portion 144 and the 2 nd guide portion 146. The rear metal plate 136 in the 1 st guide portion 144 and the front metal plate 138 in the 2 nd guide portion 146 overlap each other, and a gap is provided in the Z direction.

The 1 st guide portion 144 includes a1 st guide groove 144A and a1 st guide plane 144B, and corresponds to the 1 st guide groove 92A and the 1 st guide plane 92B, respectively. Further, the 2 nd guide portion 146 has a2 nd guide groove 146A and a2 nd guide plane 146B, corresponding to the 2 nd guide groove 98A and the 2 nd guide plane 98B, respectively. The 1 st guide portion 144 is formed by bending the rear metal plate 136, and the 2 nd guide portion 146 is formed by bending the front metal plate 138. Like the 2 nd guide portion 98, the 2 nd guide portion 146 is formed as a protruding portion protruding in a table shape in the +z direction from the +z side plate surface of the front side metal plate 138. The 1 st guide groove 144A is connected to the main body portion of the rear side metal plate 136 only on the-Y side, and the 1 st guide plane 144B is connected to the main body portion of the rear side metal plate 136 only on the +y side. The 2 nd guide groove 146A is connected to the main body portion of the front side metal plate 138 only on the-X side, and the 2 nd guide plane 146B is connected to the main body portion of the rear side metal plate 136 only on the +x side.

The rear metal plate 136 in the 1st guide portion 144 and the front metal plate 138 in the 2 nd guide portion 146 overlap each other, and a gap is provided in the Z direction. This allows at least one of the 1st guide portion 144 and the 2 nd guide portion 146 to bend and absorb an impact when receiving the impact, so that damage to the 1st support portion 94 and the 2 nd support portion 100 made of resin can be further reduced.

Specifically, the groove depth of the 1 st guide groove 144A, the groove depth of the 2 nd guide groove 146A, and the height of the protrusion forming the 2 nd guide portion 146 are determined so that the rear side metal plate 136 and the front side metal plate 138 do not come into contact. These dimensions are determined in consideration of not only dimensional tolerances but also dead weight and deflection due to attractive forces of the 4 th magnet 78 and the 4 th yoke 66, deflection in normal use, and deflection due to impact. For other portions, the 1 st guide plane 144B is positioned at a position shallower than the groove depth of the 1 st guide groove 144A, and the 2 nd guide plane 146B is positioned at a position shallower than the groove depth of the 2 nd guide groove 146A, so that a sufficient pitch is necessarily ensured.

In the vertical intersecting direction guide mechanism 22 of the modification, if a force in the +z direction is applied, the base 20 pushes the slider 134 in the +z direction, the slider 134 pushes the sensor holder 24 in the +z direction, and the sensor holder 24 pushes the slider 134 back in the-Z direction. That is, in the 1 st guide mechanism 88, the 1 st support portion 94 elastically deforms the rear metal plate 136 of the portion forming the 1 st guide portion 144 in the +z direction. The front side metal plate 138 forming part of the 2 nd guide 146 pushes the 2 nd support 100 while being elastically deformed in the-Z direction.

A gap for the bending deformation is provided between the rear side metal plate 136 of the portion forming the 1 st guide portion 144 and the front side metal plate 138 of the portion forming the 2 nd guide portion 146, so that the both do not come into contact even if the bending deformation occurs. Therefore, the 1 st guide portion 144 and the 2 nd guide portion 146 are sufficiently elastically deformable, and can absorb an impact. The deformation also occurs when a force in the-Z direction is applied, so that the gap between the rear side metal plate 136 of the portion forming the 1 st guide portion 144 and the front side metal plate 138 of the portion forming the 2 nd guide portion 146 becomes narrower.

The optical element driving device 10 used in the camera device mounted in the electronic apparatus such as the mobile phone and the smart phone is described in the above embodiment, but the present invention is also applicable to other devices.

Claims (12)

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

the device is provided with: a plate-shaped base,

A box-shaped auxiliary base fixed on the front plate of the box-shaped shell fixed on the base,

A lens holder supported in the sub-base so as to be movable in the optical axis direction of the lens,

A sensor holder for holding the image sensor and being supported by a vertical intersecting direction guide mechanism so as to be movable relative to the base in two directions intersecting perpendicularly to the optical axis direction and intersecting perpendicularly to each other,

And a slider disposed between the sensor holder and the base;

The vertical intersecting direction guide mechanism includes a metal guide groove and a guide plane formed on the front side surface and the rear side surface of the slider, and a plurality of resin support protrusions formed on the rear side surface of the sensor holder and the front side surface of the base, respectively, each of the support protrusions being in contact with either one of the guide groove or the guide plane.

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

the sensor bracket holds an image sensor fixed on the 1 st flexible printed substrate;

The 1 st flexible printed circuit board has a flat plate portion which intersects the optical axis direction perpendicularly and on which the image sensor is mounted, and a belt portion which extends in the optical axis direction from a side portion on one side of the flat plate portion and extends around the sensor holder to a side portion on the opposite side of the flat plate portion and is fixed to the base.

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

The sensor bracket has a bottom plate part with a through hole in the center and a side plate part standing up from the middle of the outer edge and the inner edge of the bottom plate part to the front side;

the band portion is located between the outer edge of the bottom plate portion and the side plate portion.

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

The bottom plate portion has a concave portion provided on the outer edge thereof and facing inward, the flat plate portion is attached to the rear side surface of the sensor holder, and the band portion extending from one side edge of the flat plate portion in the optical axis direction passes through the concave portion.

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

A convex portion protruding toward the front side is provided on 3 sides of the outer edge of the bottom plate portion, and the rear end of the band portion is located further toward the rear side than the front end of the convex portion.

6. An optical element driving apparatus according to claim 5, wherein:

An FPC fixing wall is vertically provided on an edge of the base opposite to an edge other than the outer edges of the 3 edges, and the band portion is fixed to an outer side surface of the FPC fixing wall.

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

disposing a 2 nd flexible printed substrate to enclose an outer side of 3 sides of the sub-base, the sub-base having a sidewall enclosing an outer side of 3 sides of the lens holder;

The 1 st coil and the 2 nd coil are disposed on 2 surfaces of the 2 nd flexible printed circuit board adjacent to the outer side of the side wall, and the 3 rd coil is disposed on the inner surface of the 2 nd flexible printed circuit board at a position where the side wall is not present.

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

the 2 nd flexible printed circuit board is electrically connected to the outside through a through hole provided in the front plate of the case.

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

the 3 rd magnet is disposed on the lens holder so as to face the 3 rd coil, the 1 st magnet is disposed on the sensor holder so as to face the 1 st coil, and the 2 nd magnet is disposed so as to face the 2 nd coil.

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

The sensor also comprises a4 th magnet fixed on the sensor bracket and a4 th magnetic yoke fixed on the base and opposite to the 4 th magnet;

recesses are formed on two adjacent edges of the upper periphery of the sliding block, and a 4 th magnetic yoke is fixed in the recesses.

11. A photographic apparatus comprising the optical element driving device according to claim 1 and a lens fixed to the lens holder.

12. An electronic device provided with the camera device of claim 11.