Optical member driving device, camera device, and electronic device

Abstract

Provided is an optical member driving device, a camera device, and an electronic device in which a FPC is less likely to be twisted. The optical member driving device has an optical member having a lens body, an image sensor, and a FPC electrically connected to the image sensor, and a fixing portion capable of holding the optical member so as to be tiltable about axes in X and Y directions. The FPC has a body portion fixing the image sensor, an image sensor connecting portion extending outward from a periphery of the body portion, an external terminal portion provided with an external terminal on one surface, an external terminal connecting portion extending inward from a periphery of the external terminal portion, and a linking portion linking the image sensor connecting portion and the external terminal connecting portion. The direction in which the image sensor connecting portion extends from the body portion and the direction in which the external terminal connecting portion extends from the external terminal are orthogonal.

Description

TECHNICAL FIELD

[0001] The present application relates to an optical member driving device, a camera device, and an electronic device for a smartphone or the like. BACKGROUND

[0002] In a camera device having a shake correction function, a current is supplied to an image sensor or a coil for shake correction from an external substrate via an FPC (Flexible Printed Circuit). As a document disclosing a technology related to such a camera device, there is Patent Literature 1.

[0003] The optical device for shooting disclosed in Patent Literature 1 has a camera module having a lens and an image pickup element, and a shake correction device for correcting a shake of an optical image formed on the image pickup element by the lens. The shake correction device has a support body that supports the camera module so as to be swingable, and a swing driving mechanism that swings the camera module so as to be tilted with respect to an optical axis of the lens to correct the shake. An FPC connected to the image pickup element is bent twice at a lower side of the camera module, and is led to the outside.

[0004] PRIOR ART DOCUMENTS

[0005] PATENT LITERATURE

[0006] [Patent Literature 1] Japanese Patent Application Publication No. 2011-257506 A SUMMARY

[0007] PROBLEMS TO BE SOLVED BY THE INVENTION

[0008] However, in the case of the technology of Patent Literature 1, there is a problem that the FPC is twisted when the camera module is tilted to be movable in a manner that the lens optical axis is tilted.

[0009] The present application has been achieved in view of such a problem, and an object thereof is to provide an optical member driving device in which the FPC is less likely to be twisted.

[0010] MEANS FOR SOLVING THE PROBLEM

[0011] To solve the above problems, an optical member driving device according to an aspect of the present application includes: an optical member having a lens body, an image sensor that converts light incident through the lens body into a signal, and a flexible printed circuit (FPC) electrically connected to the image sensor; and a fixed portion that movably supports the optical member so as to be tiltable about axes in X and Y directions, the FPC having: a body portion that holds the image sensor; an image sensor connecting portion that extends outward from a periphery of the body portion; an external terminal portion that has external terminals provided on one surface; an external terminal connecting portion that extends inward from a periphery of the external terminal portion; and a connecting portion that connects the image sensor connecting portion and the external terminal connecting portion, the image sensor connecting portion extending from the body portion in a direction orthogonal to a direction in which the external terminal connecting portion extends from the external terminal portion.

[0012] In this aspect, the image sensor connecting portion can extend from two or four positions that are symmetric with respect to a point centered on a center of the image sensor.

[0013] Further, the two connecting portions can be L-shaped and symmetric with respect to a point centered on a center of the image sensor.

[0014] Further, the body portion can be rectangular, and one of the two L-shaped connecting portions can be disposed along two sides of the body portion, and the other of the two L-shaped connecting portions can be disposed along the remaining two sides of the body portion.

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

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

[0017]

Effects of Invention

[0018] The optical member driving device of the present application, in an XYZ orthogonal coordinate system, has: an optical member having a lens body, an image sensor that transforms light that has entered via the lens body into a signal, and an FPC electrically connected to the image sensor; and a fixing portion that movably holds the optical member tiltable around axes in the X and Y directions, the FPC having a body portion that fixes the image sensor, an image sensor connecting portion that extends outward from the periphery of the body portion, an external terminal connecting portion that has an external terminal provided on one face, an external terminal connecting portion that extends inward from the periphery of the external terminal portion, and a connecting portion that links the image sensor connecting portion and the external terminal connecting portion, the direction in which the image sensor connecting portion extends from the body portion and the direction in which the external terminal connecting portion extends from the external terminal portion being orthogonal. The image sensor connecting portion and the external terminal connecting portion are easily deformed when moved tiltable in a direction orthogonal to the direction in which they extend, but are difficult to deform when moved tiltable in a parallel direction. Therefore, when the movable portion is moved tiltable around one of the axes in the X and Y directions, the easily deformed one of the image sensor connecting portion and the external terminal connecting portion is deformed more, and therefore it is difficult for a twist to occur. Therefore, an optical member driving device in which a twist is difficult to occur can be provided. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 is a front view of a smartphone 102 on which a camera device 101 including an optical member driving device 100 that is one embodiment of the present application is mounted.

[0020] Figure 2 is Figure 1 a perspective view of the optical member driving device 100.

[0021] Figure 3 is a perspective view of the optical member driving device 100 with the frame body 7 removed. Figure 2

[0022] Figure 4 is a perspective view of the optical member driving device 100 with the housing 1 removed. Figure 2

[0023] Figure 5 is a perspective view of the optical member driving device 100 with the gimbal spring 2 removed. Figure 4

[0024] Figure 6 is a perspective view of the image sensor portion of Figure 3

[0025] Figure 7 is a perspective view of the optical member driving device 100 with the frame body 7 removed. Figure 6

[0026] Figure 8 is a perspective view of the optical member driving device 100 with the housing 1 removed. Figure 4 ​​​​​A 3D image with varying angles.

[0027] Figure 9 From Figure 2 A three-dimensional view viewed from the inside after removing the base plate 9.

Detailed Implementation Methods

[0028] The following is a reference to the appendix. Figure 1 The embodiments of the present invention will be described below. For example... Figure 1 As shown, a camera device 101, including an optical component driving device 100 as one embodiment of the present invention, is housed within the frame of a smartphone 102.

[0029] The camera device 101 includes an optical component drive device 100. Here, an XYZ orthogonal coordinate system is used, in which the X-axis, Y-axis, and Z-axis are orthogonal to each other. The direction of the optical axis O of the lens body 130 is initially parallel to the Z-direction. Furthermore, when viewed from the lens body 130, the side of the subject is the +Z side, sometimes referred to as the front side, and the opposite side (the image sensor 190 side) is the -Z side, sometimes referred to as the rear side.

[0030] like Figure 3 As shown, the optical component driving device 100 includes an outer casing 1, a universal spring 2, an AF (Autofocus) module 3 (an optical component), four magnets 35, eight coils 4, an FPC 5, a bracket 6, and a base plate 9. The various components are housed inside the outer frame formed by the outer casing 1 and the base plate 9. Among these components, the AF module 3 and the four magnets 35 constitute the movable part. The outer casing 1, the eight coils 4, the FPC 5, the bracket 6, and the base plate 9 constitute the fixed part. The universal spring 2 connects the movable part and the fixed part, supporting it to allow for tilting of the movable part relative to the fixed part in the X and Y directions. Here, the tilting movement in the X and Y directions also includes tilting movement in the direction between the X and Y directions. In this embodiment, the optical component driving device 100 is a device for jitter correction by tilting the AF module 3 in the X and Y directions.

[0031] The AF module 3 includes a lens body 130, a lens driving device, and an image sensor unit. The lens driving device houses the lens body 130 and an actuator (not shown) inside an inner frame consisting of an inner cover 31 and a base 37. The image sensor unit includes a frame 7, an FPC 8, a sensor substrate 191, and an image sensor 190, and is mounted on the base 37. The actuator drives the lens body 130 in a direction parallel to the optical axis O of the lens body 130. The driving source for the actuator can include, but is not limited to, magnets, coils, piezoelectric elements, and shape memory alloys. Alternatively, an actuator may not be provided, and a fixed focal point may be used. Conversely, multiple lens bodies 130 may be driven.

[0032] The inner cover 31 has a front plate 311 and four side plates 312 extending from the four edges of the front plate 311 toward the -Z side. Through-holes are provided in the front plate 311 of the inner cover 31 and the base 37, respectively. The lens body 130 is exposed to the +Z side via the through-holes of the inner cover 31.

[0033] Four magnets 35 are provided on the outer surfaces of the four side plates 312 of the inner cover 31. For each of the magnets 35, two magnet pieces in a cuboid shape are juxtaposed in the Z direction. The two magnet pieces are magnetized so that the magnetic poles in the plate surface direction become opposite magnetic poles. Each of the magnets 35 can also be magnetized in one magnet piece as in the above-described magnetic pole configuration.

[0034] For the image sensor section, the image sensor 190 is mounted together with the sensor substrate 191 at the center of the FPC 8, and the frame body 7 is mounted to the FPC 8 from the front side of the image sensor 190 to constitute. The frame body 7 is mounted to the rear surface of the base 37. The image sensor 190 is in a rectangular shape, located directly behind the lens body 130, and converts light incident via the lens body 130 to an image signal and outputs.

[0035] The FPC 8 electrically connects the body of the camera device 101 and the image sensor 190 and the actuator of the AF module 3.

[0036] The outer cover 1 has a front plate 11 and four side plates 12 extending from the four edges of the front plate 11 toward the -Z side. The outer cover 1 and the bottom plate 9 are combined as an outer frame body. A through-hole 10 is provided in the front plate 11 of the outer cover 1. The four wall portions 61 of the bracket 6 face each other in the X and Y directions, respectively.

[0037] The bracket 6 is a frame-shaped body in a quadrangle shape having two pairs of wall portions 61 facing each other in the X and Y directions, and a leg portion 63 extending toward the rear side is provided at one diagonal. The leg portion 63 is placed and fixed to the front surface of the bottom plate 9. A recessed portion is provided in the outer surface of the wall portion 61 of the bracket 6 except for the corner portion where the X-side wall portion 61 and the +Y-side wall portion 61 intersect. The FPC 5 is fixed in the recessed portion. The FPC 5 is bent along the recessed portion. The FPC 5 electrically connects the body of the camera device 101 and the coil 4 and the Hall element 49 described later.

[0038] On the four wall portions 61, long holes 62 are provided. On the long holes 62 of the four wall portions 61, eight coils 4 are housed two by two along the directions of the sides of the quadrangle. The coils 4 fixed on the wall portions 61 facing each other in the X direction are wound around the X axis as the winding axis, and the coils 4 fixed on the wall portions 61 facing each other in the Y direction are wound around the Y axis as the winding axis. The -Y side coil 4 among the coils 4 fixed on the +X side wall portion 61, the +Y side coil 4 among the coils 4 fixed on the -X side wall portion 61, and the X side coil 4 among the coils 4 fixed on the -Y side wall portion 61 are each provided with a Hall element 49 in the hollow core portion thereof. The coils 4 and the Hall elements 49 are fixed to the inner face of the FPC 5 so as to face the magnets 35.

[0039] Preferably, for the eight coils 4, four groups of coils are provided, for example, two coils 4 located on opposite sides of the optical axis O are respectively electrically connected in series. When a current flows through the two coils 4, electromagnetic forces of the same magnitude and in opposite directions in the front-rear direction are generated. Thus, no unwanted force that moves the AF module 3 in the Z direction is generated, and the AF module 3 can be tilted to move in a direction orthogonal to the line connecting the two coils 4.

[0040] Two of the three Hall elements 49 are disposed at positions separated from each other on opposite sides of the optical axis O. The remaining one Hall element 49 is disposed at a position separated from the optical axis O in a direction orthogonal to the direction connecting the two Hall elements 49. That is, the three Hall elements 49 are disposed at positions separated by 90 degrees on opposite sides of the optical axis O. The Hall elements 49 detect the magnetic field from the magnets 35 facing the Hall elements 49 and output a signal indicating the detection result. The signal corresponds to the position in the Z direction of the magnet 35 facing the Hall element 49. By deriving the position in the Z direction, even if the position of the AF module 3 in the Z direction is shifted when the AF module 3 is tilted, the amount of the shift can be detected, and thus an accurate tilt can be derived. The three Hall elements 49 are disposed at positions equidistant from the optical axis O.

[0041] The gimbal spring 2 has an inner frame portion 21, a middle frame portion 22, and an outer frame portion 23. The inner frame portion 21 and the middle frame portion 22 are connected by a first connecting portion 24 at the center portion in the X direction, and the middle frame portion 22 and the outer frame portion 23 are connected by a second connecting portion 25 at the center portion in the Y direction.

[0042] The inner frame portion 21 of the gimbal spring 2 is fixed to the peripheral edge of the front plate 311 of the inner housing 31 of the AF module 3. The outer frame portion 23 of the gimbal spring 2 is fixed to the front end of the wall portion 61 of the bracket 6. The AF module 3 and the magnets 35, which are movable portions, are supported in a state of floating in the space inside the four wall portions 61 of the bracket 6 by the gimbal spring 2.

[0043] The FPC 8 is a thin plate of point symmetry. The FPC 8 has a body portion 82, an image sensor connecting portion 83, an external terminal portion 81, an external terminal connecting portion 84, and a connecting portion 85. The body portion 82 is rectangular. A hole is provided in the center of the body portion 82, and the image sensor 190 is fixed to the sensor substrate 191, which is inserted into the hole from the rear side, and the body portion 82 is fixed to the front surface of the sensor substrate 191.

[0044] Two of the image sensor connecting portion 83, the external terminal portion 81, the external terminal connecting portion 84, and the connecting portion 85 are provided at positions of point symmetry with the center of the image sensor 190 as the center. The image sensor connecting portion 83 extends from the base end of the position near the -Y side of the +X side edge of the body portion 82 and the base end of the position near the +Y side of the -X side edge toward the outside, that is, toward the +X direction and the -X direction, respectively. The front end of the image sensor connecting portion 83 is connected to one end of the connecting portion 85.

[0045] The connecting portion 85 is L-shaped, and the bending angle thereof corresponds to the corner of the leg portion 8 where the holder 6 is not provided. The connecting portion 85 is bent at a right angle from the portion connected to the image sensor connecting portion 83, and on the other hand, extends in the +X side edge in the +Y direction, surrounds the outside of the corner of the body portion 82, and extends in the +Y side edge in the -X direction. On the other hand, it extends in the -X side edge in the -Y direction, surrounds the outside of the corner of the body portion 82, and extends in the -Y side edge in the +X direction. The other end of the connecting portion 85 is connected to the front end of the external terminal connecting portion 84. That is, one of the two connecting portions 85 that are L-shaped is provided along two edges of the rectangular body portion 82, and the other is provided along the remaining two edges of the body portion 82. The connecting portion 85 is located in the space between the rear surface of the holder 6 formed by the leg portion 63 and the front surface of the bottom plate 9, and is located near the center between the two. Thus, even if the AF module 3 is tilted and moved forward and backward, and the FPC 8 is moved forward and backward, it is difficult to cause unwanted contact with other portions.

[0046] The external terminal connecting portion 84 extends from the base end of the external terminal portion 81 side toward the inside, that is, in the -Y direction and the +Y direction, respectively, and is connected to the other end of the connecting portion 85. On the rear surface of the external terminal portion 81, an external terminal 811 is provided. At the portion of the external terminal connecting portion 84, the FPC 8 protrudes to the outside of the optical member driving device 100 from the gap between the housing 1 and the bottom plate 9 formed by the cutout provided in the housing 1, and the external terminal 811 is connected to and fixed to the external substrate. The direction in which the image sensor connecting portion 83 extends from the body portion 82 and the direction in which the external terminal connecting portion 84 extends from the external terminal portion 81 are orthogonal.

[0047] A control section (not shown) is provided on the FPC 5. The control section performs detection control for determining the tilt of the Z axis with respect to the movable section based on the output signals of the three Hall elements 49 of the movable section, and drive control for individually controlling the current flowing through the coils 4 to actuate the movable section based on the result. The control section can also be provided outside the optical member driving device 100.

[0048] In the detection control, the control section, for example, first calculates the average of the output signals of two of the three Hall elements 49 disposed at positions separated from each other on opposite sides of the optical axis O, and calculates the position of the Z axis of the movable section from the value. The average and the difference between the output signals of any of the two Hall elements 49 are calculated, and the deviation of the position of the Z axis of the movable section from the position of the Z axis of the magnet 35 is calculated from the difference. The amount of tilt of the movable section in the plane formed by the magnet 35 and the optical axis O with respect to the Z axis is calculated from the distance from the optical axis O to the magnet 35 and the deviation of the position of the Z axis of the magnet 35. Next, the average of the output signals of the two Hall elements 49 and the difference between the output signal of the remaining one (i.e., the third) Hall element 49 are calculated, and the deviation of the position of the Z axis of the movable section from the position of the Z axis of the magnet 35 is calculated from the difference. The amount of tilt of the movable section in the plane formed by the magnet 35 facing the remaining one Hall element 49 and the optical axis O with respect to the Z axis is calculated from the distance from the optical axis O to the magnet 35 and the deviation of the position of the Z axis of the magnet 35.

[0049] In the drive control, the control section flows current through the coils 4 in such a manner that the AF module 3 is appropriately tilted and moved for shake correction. When current is flowed through the prescribed two coils 4 sandwiching the optical axis O on opposite sides, electromagnetic forces of opposite directions and the same magnitude are generated in the front-rear direction. Since there are four groups of coils 4 generating electromagnetic forces of opposite directions sandwiching the optical axis O, the AF module 3 can be tilted and moved about the axis of the prescribed direction in the XY plane by flowing appropriate current through the groups of coils 4, and fine shake correction control can be performed.

[0050] The above is a detail of the configuration of the present embodiment. The optical member driving device 100 of the present embodiment, in an XYZ orthogonal coordinate system, has: an optical member having a lens body 130, an image sensor 190 that converts light incident via the lens body 130 into a signal, and an FPC 8 electrically connected to the image sensor 190; a fixed portion that movably holds the optical member around axes in the X and Y directions, the FPC 8 having a body portion 82 that holds the image sensor 190 fixed, an image sensor connecting portion 83 that extends outward from the periphery of the body portion 82, an external terminal portion 81 that has external terminals 811 on one face, an external terminal connecting portion 84 that extends inward from the periphery of the external terminal portion, and a linking portion 85 that links the image sensor connecting portion 83 and the external terminal connecting portion 84. Thus, the direction in which the image sensor connecting portion 83 extends from the body portion 82 and the direction in which the external terminal connecting portion 84 extends from the external terminals 811 are orthogonal. Therefore, when the movable portion moves movably around the axis of the Y axis, the image sensor connecting portion 83 easily deforms following the movement, but the external terminal connecting portion 84 deforms in a direction in which it is twisted, so the resistance to deformation becomes large, and deformation is difficult to occur. Therefore, the image sensor connecting portion 83 deforms. When the movable portion moves movably around the axis of the X axis, the external terminal connecting portion 84 easily deforms following the movement, but the image sensor connecting portion 83 deforms in a direction in which it is twisted, so the resistance to deformation becomes large, and deformation is difficult to occur. Therefore, the external terminal connecting portion 84 deforms. Regardless of the axis around which the movable portion moves movably, the resistance to deformation is large, and twisting is difficult to occur. Therefore, it is possible to provide the optical member driving device 100 in which the FPC 8 is difficult to twist. In addition, as a result, the resistance of the FPC 8 to movement is small, so it is possible to achieve smooth movement.

[0051] Further, in the above embodiment, the number of the image sensor connecting portion 83, the external terminal portion 81, the external terminal connecting portion 84, and the linking portion 85 can be four. In this case, the image sensor connecting portion 83 can project from the body portion 82 at four positions that are point-symmetrical with the center of the image sensor 190 as the center.

[0052] In addition, in the above embodiment, eight coils 4 are provided in the movable portion, and four magnets 35 are provided in the fixed portion.

[0053] Also, two adjacent coils 4 can be electrically connected to form four coil groups for generating electromagnetic forces in the same direction in the front-back direction when current flows, and two coil groups located on opposite sides of the optical axis O are electrically connected for generating electromagnetic forces in opposite directions in the front-back direction when current flows. In this case, the two coils 4 that are electrically connected can be two coils 4 disposed on the same wall portion 61, or can be two coils 4 disposed on two adjacent wall portions 61. The coils 4 can also not be electrically connected to other coils 4, but can independently flow current. The number of coils 4 is not limited to eight, but can be four or the like. In this case, control is simple.

[0054] The FPC 8 is shaped so as to tilt the optical member, and can be applied. For example, the coils 4 and the magnets 35 can be disposed on the bottom surface of the AF module 3 and the front surface of the base plate 9. Alternatively, a piezoelectric element or a shape memory alloy can be used as the driving source. In addition, the AF module 3 need not be an optical member, and can be a fixed focus module, for example.

[0055] Instead of the gimbal spring 2, a pivot or the like can be used.

[0056] SYMBOL DESCRIPTION

[0057] 1 housing; 2 gimbal spring; 3 AF module; 4 coil; 5, 8 FPC; 6 bracket; 7 frame; 9 base plate; 10 through hole; 11, 311 front plate; 12, 312 side plate; 21 inner frame portion; 22 middle frame portion; 23 outer frame portion; 24 first connecting portion; 25 second connecting portion; 31 inner housing; 35 magnet; 37 pedestal; 49 Hall element; 61 wall portion; 62 long hole; 63 leg portion; 80 hole; 81 external terminal portion; 82 body portion; 83 image sensor connecting portion; 84 external terminal connecting portion; 85 connecting portion; 100 optical member driving device; 101 camera device; 102 smartphone; 130 lens body; 190 image sensor; 191 sensor substrate; 811 external terminal.

Claims

1. An optical component driving device, characterized in that, In the XYZ orthogonal coordinate system, it has the following properties: An optical component comprising a lens body, an image sensor that converts light incident through the lens body into a signal, and an FPC electrically connected to the image sensor; and A fixing part, which can tilt and movably hold the optical component about axes in the X and Y directions. The FPC includes: a rectangular body portion that fixes the image sensor; an image sensor connection portion extending outward from the periphery of the body portion; an external terminal portion having an external terminal on one side; an external terminal connection portion extending inward from the periphery of the external terminal portion; and a connection portion connecting the image sensor connection portion and the external terminal connection portion. Two of each of the image sensor connection part, the external terminal part, the external terminal connection part, and the connecting part are provided, located symmetrically about the center of the image sensor. One of the image sensor connection portions extends in the +X direction from its base end on the +Y side of the periphery of the body portion, near the -Y side. The front end of this image sensor connection portion is connected to one end of a connecting portion. The connecting portion is L-shaped, bending at a right angle from the portion connected to the image sensor connection portion, extending in the +Y direction along the +X side, surrounding the outer side of the corner of the body portion, and extending in the -X direction along the +Y side. The other end of this connecting portion is connected to the front end of an external terminal connection portion. An external terminal connection portion extends in the -Y direction from its base end on one of the external terminal portions and is connected to the other end of the connecting portion. Another image sensor connection portion extends from its base end on the -X side of the periphery of the body portion, near the +Y side, towards the -X direction. The front end of this other image sensor connection portion is connected to one end of the other connecting portion. This other connecting portion is L-shaped, bending at a right angle from the portion connected to the other image sensor connection portion, extending along the -X side towards the -Y direction, surrounding the outer side of the corner of the body portion, and extending along the -Y side towards the +X direction. The other end of this other connecting portion is connected to the front end of the other external terminal connection portion. The other external terminal connection portion extends in the +Y direction from its base end on the other external terminal portion side and is connected to the other end of the other connecting portion. The surfaces of the main body, the two image sensor connection portions, the two external terminal portions, the two external terminal connection portions, and the two connecting portions are all located in the XY plane and all face the same direction, namely the Z direction. The orientation of one image sensor connection extending from the body portion and the orientation of one external terminal connection extending from one external terminal portion are orthogonal, and the orientation of another image sensor connection extending from the body portion and the orientation of another external terminal connection extending from the other external terminal portion are orthogonal.

2. A camera device, characterized in that, It has the optical component driving device as described in claim 1.

3. An electronic device, characterized in that, The device comprises the camera apparatus of claim 2.

Images