Optical Component Driving Device, Camera Device, and Electronic Device

Abstract

The present invention provides an optical component driving device, a camera device, and an electronic device, which can perform fine shake correction. The optical component driving device (100) in the XYZ orthogonal coordinate system includes: an AF module (3), which, as an optical component, has a lens body (130) with the Z direction as the direction of the optical axis (O), and an image sensor (190) that converts the light incident through the lens body (130) into an image signal; a fixing portion that is provided to surround the AF module (3); four magnets (35) that are provided on the outer surface of the AF module (3) so as to surround the optical axis (O); and eight coils (4) that are provided on the inner surface of the FPC (5) so as to surround the optical axis (O) and face the magnets (35). Thus, the AF module (3) is tilted and moved around the axes in the X and Y directions by the electromagnetic force between the magnets (35) and the coils (4).

Description

Technical Field

[0001] The present invention relates to an optical component driving device, a camera device, and an electronic device for electronic devices such as smartphones. Background Art

[0002] In a camera device for an electronic device such as a smartphone, a coil and a magnet are respectively provided on a carrier for holding a lens body and a bracket for holding the carrier, and automatic focus control or shake correction is achieved by separately controlling the magnitude of the current flowing through each coil. As a document disclosing a technique related to such a camera device, there is Patent Document 1.

[0003] The photographing optical device disclosed in Patent Document 1 includes a camera module having a lens and an imaging element, and a shake correction device for correcting shake of an optical image formed by the lens on the imaging element. The shake correction device includes a support body that swingably supports the camera module, and a swing drive mechanism for swinging the camera module to tilt the optical axis of the lens with respect to the support body to correct shake. The swing drive mechanism is composed of four shake correction magnets fixed to the outer surface of the camera module and four shake correction coils respectively opposed to the shake correction magnets from the outside.

[0004]

Prior Art Documents

[0005]

Patent Documents

[0006]

Patent Document 1

[0007]

Problems to be Solved by the Invention

[0008] However, the problem with the technique of Patent Document 1 is that it merely circulates four pairs of coils and magnets around the camera module, resulting in rough control.

[0009] The present invention has been made in view of such a problem, and an object thereof is to provide an optical component driving device capable of performing fine shake correction control.

[0010]

Means for Solving the Problems

[0011] In order to solve the above problems, as an optical component driving device according to a preferred embodiment of the present invention, in an XYZ orthogonal coordinate system, it includes: an optical component, which is a lens body with the Z direction as the optical axis direction, and an image sensor that converts the light incident through the lens body into an image signal; a fixing part, which is arranged to surround the optical component; a plurality of magnets, which are provided on one of the outer surface of the optical component or the inner surface of the fixing part so as to surround the optical axis; and eight coils, which are provided on the other of the outer surface of the optical component or the inner surface of the fixing part so as to surround the optical axis, facing the magnets, and the optical component is tilted and moved around the axes in the X and Y directions by the electromagnetic force between the magnets and the coils.

[0012] Alternatively, the coils are electrically connected to two of the coils located on opposite sides sandwiching the optical axis so that when a current flows through them, electromagnetic forces in opposite directions are generated in the front-rear direction.

[0013] Alternatively, the coils are electrically connected to adjacent two of the coils so that when a current flows through them, electromagnetic forces in the same direction are generated in the front-rear direction, forming four coil groups, and the two coil groups located on opposite sides sandwiching the optical axis are electrically connected so that when a current flows through them, electromagnetic forces in opposite directions are generated in the front-rear direction.

[0014] Alternatively, among the eight coils, four of the coils are wound around a winding shaft in the X direction and face the magnets in the X direction, and the remaining four coils are wound around a winding shaft in the Y direction and face the magnets in the Y direction.

[0015] Alternatively, all of the eight coils are wound around a winding shaft in the Z direction and face the magnets in the Z direction.

[0016] Alternatively, the fixing part further includes a holding base plate and a bracket for holding the coils or the magnets, the bracket forms a quadrilateral through four wall parts, and has a leg extending rearward at one diagonal of the quadrilateral, and the leg is placed and fixed on the front surface of the base plate.

[0017] Alternatively, it further includes an FPC electrically connected to the image sensor, and the FPC is located in the space between the rear surface of the bracket and the front surface of the base plate.

[0018] As a camera device according to another preferred embodiment of the present invention, it includes the above optical component driving device.

[0019] As an electronic device according to another preferred embodiment of the present invention, it includes the above camera device.

[0020]

Advantages of the Invention

[0021] The optical component driving device of the present invention includes, in an XYZ orthogonal coordinate system: an optical component having a lens body with an optical axis in the Z direction and an image sensor that converts light incident through the lens body into an image signal; a solid part arranged to surround the optical component; a plurality of magnets arranged on one of the outer surface of the optical component or the inner surface of the fixed part so as to surround the optical axis; and eight coils arranged on the other of the outer surface of the optical component or the inner surface of the fixed part so as to surround the optical axis, facing the magnets, and tilting and moving the optical component around the axes in the X and Y directions by the electromagnetic force between the magnets and the coils. Thus, an optical component driving device capable of performing fine jitter correction control can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. 6 is a front view of a smartphone 102 equipped with a camera device 101 including an optical component driving device 100 according to an embodiment of the present invention.

[0023] Figure 2 FIG. Figure 1 7 is a perspective view of the optical component driving device 100.

[0024] Figure 3 FIG. 8 is a perspective view of the disassembled optical component driving device 100. Figure 2 FIG. 8 is a perspective view of the disassembled optical component driving device 100.

[0025] Figure 4 FIG. 9 is a perspective view of the removed outer cover 1. Figure 2 FIG. 9 is a perspective view of the removed outer cover 1.

[0026] Figure 5 FIG. 10 is a perspective view of the removed gimbal spring 2. Figure 4 FIG. 10 is a perspective view of the removed gimbal spring 2.

[0027] Figure 6 FIG. Figure 3 11 is a perspective view of the image sensor unit.

[0028] Figure 7 FIG. 12 is a perspective view of the removed housing 7. Figure 6 FIG. 12 is a perspective view of the removed housing 7.

[0029] Figure 8 FIG. 13 is a perspective view of the changed angle in FIG. Figure 4 13.

[0030] Figure 9 FIG. 14 is a perspective view of the removed bottom plate 9 viewed from the inside. Figure 2 FIG. 14 is a perspective view of the removed bottom plate 9 viewed from the inside. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0031] Hereinafter, embodiments of the present invention will be described with reference to the accompanying Figure 1 drawings. As Figure 1As shown, a camera device 101 including an optical component driving device 100 as an embodiment of the present invention is housed in a housing of a smartphone 102.

[0032] The camera device 101 has an optical component driving device 100. Here, using an XYZ orthogonal coordinate system, 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 parallel to the Z-direction in the initial state. In addition, 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 (image sensor 190 side) is the -Z side, sometimes referred to as the rear side.

[0033] As Figure 3 As shown, the optical component driving device 100 has a housing 1, a gimbal spring 2, an AF (Autofocus) module 3 as an optical component, four magnets 35, eight coils 4, an FPC 5, a bracket 6, and a base plate 9. Each component is housed inside an outer frame formed by the housing 1 and the base plate 9. Among these components, the AF module 3 and the four magnets 35 constitute a movable part. In addition, the housing 1, the eight coils 4, the FPC 5, the bracket 6, and the base plate 9 constitute a fixed part. The gimbal spring 2 connects the movable part and the fixed part and is supported so as to be able to perform tilting movements around axes in the X and Y directions with respect to the movable part and the fixed part. Here, the tilting movements around axes in the X and Y directions also include tilting movements around axes in directions intermediate between the X direction and the Y direction. In the present embodiment, the optical component driving device 100 is a device that performs shake correction by tilting the AF module 3 around axes in the X and Y directions.

[0034] The AF module 3 has a lens body 130, a lens driving device, and an image sensor unit. The lens driving device has a lens body 130 and an actuator (not shown) inside an inner frame formed by an inner housing 31 and a base 37. The image sensor unit has a housing 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. Examples of the driving source of the actuator include magnets, coils, piezoelectric elements, shape memory alloys, etc., but are not limited thereto. In addition, an actuator may not be provided, and the focus may be fixed. Conversely, multiple lens bodies 130 may also be driven.

[0035] The inner housing 31 has a front plate 311 and four side plates 312 extending along the Z side from the four sides of the front plate 311. Through holes are respectively provided in the front plate 311 of the inner housing 31 and the base 37. The lens body 130 is exposed to the +Z side through the through hole of the inner housing 31.

[0036] On the outer surfaces of the four side plates 312 of the inner cover 31, four magnets 35 are provided. For each magnet 35, two magnet pieces in the shape of a cuboid are arranged side by side in the Z direction. The two magnet pieces are magnetized so that the magnetic poles in the plate surface direction are opposite poles. Each magnet 35 can also be magnetized on one magnet piece to obtain the above-mentioned magnetic pole configuration.

[0037] For the image sensor unit, at the center of the FPC 8, the image sensor 190 is mounted together with the sensor substrate 191, and the frame 7 is mounted to the FPC 8 starting from the front side of the image sensor 190. The frame 7 is mounted on the rear surface of the base 37. The image sensor 190 is rectangular and is located directly behind the lens body 130, and converts the light incident through the lens body 130 into an image signal and outputs it.

[0038] The FPC 8 electrically connects the main body of the camera device 101, the image sensor 190 of the AF module 3, and the actuator.

[0039] The outer cover 1 has a front plate 11 and four side plates 12 extending along the -Z side from the four sides of the front plate 11. The outer cover 1 and the bottom plate 9 are combined as an outer frame. On the front plate 11 of the outer cover 1, a through hole 10 is provided. The four wall portions 61 of the bracket 6 face each other in the X and Y directions respectively.

[0040] The bracket 6 is a quadrilateral frame body having two pairs of wall portions 61 facing each other in the X and Y directions, and a leg portion 63 extending rearward is provided at one diagonal. The leg portion 63 is placed and fixed on the front surface of the bottom plate 9. On 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, a recessed portion recessed inward is provided. The FPC 5 is fixed in this recessed portion. The FPC 5 is bent along the recessed portion. The FPC 5 electrically connects the main body of the camera device 101 and the coil 4 and the Hall element 49 described later.

[0041] On the four wall portions 61, long holes 62 are provided. Along the length direction of each side of the quadrilateral, eight coils 4 are respectively accommodated two by two in the long holes 62 of the four wall portions 61. The coils 4 fixed on the wall portions 61 facing each other in the X direction are wound around the X axis as a winding shaft, and the coils 4 fixed on the wall portions 61 facing each other in the Y direction are wound around the Y axis as a winding shaft. In the hollow portions of 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, one Hall element 49 is respectively arranged. The coil 4 and the Hall element 49 are fixed on the inner surface of the FPC 5 and face the magnet 35.

[0042] Preferably, for the eight coils 4, for example, two coils 4 sandwiching the optical axis O and located on opposite sides are electrically connected in series respectively, and a group of four coils is provided. When current flows through these two coils 4, electromagnetic forces with opposite directions and the same magnitude in the front and rear directions are generated. Thus, an unnecessary force that causes the AF module 3 to move in the Z direction is not generated, and the AF module 3 can be tilted and moved with the direction orthogonal to the line connecting these two coils 4 as the axis direction.

[0043] Two of the three Hall elements 49 are arranged at positions separated from each other on opposite sides with the optical axis O as the center. The remaining one Hall element 49 is arranged at a position separated from the optical axis O along a direction orthogonal to the direction connecting the two Hall elements 49. That is, the three Hall elements 49 are arranged at 90-degree intervals with the optical axis O as the center. The Hall element 49 detects the magnetic field from the magnet 35 facing the Hall element 49 and outputs a signal representing the detection result. This signal corresponds to the position of the magnet 35 in the Z direction facing the Hall element 49. By deriving this position in the Z direction, even if the position of the AF module 3 in the Z direction shifts during the tilting movement, the amount of the shift can be detected, so that an accurate tilt can be derived. The three Hall elements 49 are located at positions equidistant from the optical axis O.

[0044] 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 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 in the Y direction.

[0045] The inner frame portion 21 of the gimbal spring 2 is fixed to the periphery of the front plate 311 of the inner cover 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. Through the gimbal spring 2, the AF module 3 as the movable portion and the magnet 35 are supported in a floating state in the space inside the four wall portions 61 of the bracket 6.

[0046] The FPC 8 is a point-symmetric thin plate. The FPC 8 has a main body portion 82, an image sensor connection portion 83, an external terminal portion 81, an external terminal connection portion 84, and a connecting portion 85. The main body portion 82 is rectangular. A hole is provided in the center of the main body portion 82, and the image sensor 190 is fixed to the sensor substrate 191 and inserted into this hole from the rear side, and the main body portion 82 is fixed to the front surface of the sensor substrate 191.

[0047] The image sensor connection portions 83, the external terminal portions 81, the external terminal connection portions 84, and the connection portions 85 are each provided in two, and are located at positions that are point-symmetrical about the center of the image sensor 190. The image sensor connection portions 83 extend outwardly, that is, in the +X direction and the -X direction, respectively, from the base ends at positions on the +X side edge of the peripheral edge of the main body portion 82 closer to the Y side and at positions on the -X side edge closer to the +Y side edge. The front ends of the image sensor connection portions 83 are connected to one ends of the connection portions 85.

[0048] The connection portion 85 is L-shaped, and its bending angle corresponds to the corner of the leg portion 8 where the bracket 6 is not provided. The connection portion 85 bends at a right angle from the portion adjacent to the image sensor connection portion 83. On the other hand, it extends in the +Y direction along the +X side edge, surrounds the outside of the corner portion of the main body portion 82, and extends in the X direction along the +Y side edge. On the other hand, it extends in the -Y direction along the -X side edge, surrounds the outside of the corner portion of the main body portion 82, and extends in the +X direction along the -Y side edge. The other end of the connection portion 85 is connected to the front end of the external terminal connection portion 84. That is, one of the two L-shaped connection portions 85 is provided along two sides of the rectangular main body portion 82, and the other is provided along the remaining two sides of the main body portion 82. The connection portion 85 is located in the space between the rear surface of the bracket 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 tilts and moves and the FPC 8 moves forward and backward, it is difficult to have unnecessary contact with other parts.

[0049] The external terminal connection portions 84 extend inwardly, that is, in the -Y direction and the +Y direction, respectively, from the base ends on the external terminal portion 81 side, and are connected to the other ends of the connection portions 85. On the rear surface of the external terminal portion 81, external terminals 811 are provided. In the portion of the external terminal connection portion 84, the FPC 8 extends out of the optical component driving device 100 through the gap between the outer cover 1 and the bottom plate 9 formed by the cut provided in the outer cover 1, and the external terminals 811 are connected and fixed to an external substrate. The extending direction of the image sensor connection portion 83 from the main body portion 82 and the extending direction of the external terminal connection portion 84 from the external terminal portion 81 are orthogonal.

[0050] A control portion (not shown) is provided on the FPC 5. This control portion performs: detection control to determine the tilt with respect to the Z axis of the movable portion based on the output signals of the three Hall elements 49 of the movable portion; and drive control to separately control the current flowing through the coil 4 to move the movable portion based on the result. The control portion may also be provided outside the optical component driving device 100.

[0051] In the detection control, the control unit first calculates, for example, the average value of the output signals of two Hall elements 49 that are arranged at positions separated from each other on opposite sides with respect to the optical axis O among the three Hall elements 49, and calculates the position of the movable part in the Z direction based on this value. The difference between the calculated average value and any one of the output signals of the two Hall elements 49 is calculated, and the deviation between the position of the movable part in the Z direction and the position of the magnet 35 in the Z direction is calculated based on this difference. Based on the distance from the optical axis O to the magnet 35 and the deviation of the position of the magnet 35 in the Z direction, the tilt amount of the movable part in the plane formed by the magnet 35 and the optical axis O with respect to the Z axis is calculated. Next, the difference between the average value of the output signals of the two Hall elements 49 and the output signal of the remaining one (i.e., the third) Hall element 49 is calculated, and the deviation between the position of the movable part in the Z direction and the position of the magnet 35 in the Z direction is calculated based on this difference. Based on the distance from the optical axis O to the magnet 35 and the deviation of the position of the magnet 35 in the Z direction, the tilt amount of 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.

[0052] In the drive control, the control unit causes a current to flow through the coil 4 in such a manner that the AF module 3 is tilted appropriately for jitter correction. When a current flows through two specified coils 4 that are located on opposite sides with respect to the optical axis O, electromagnetic forces that are opposite in direction and equal in magnitude are generated in the front-rear direction. Since there are four sets of coils 4 that generate electromagnetic forces in opposite directions with respect to the optical axis O, by causing an appropriate current to flow through each set of coils 4, the AF module 3 can be tilted and moved about an axis in a specified direction within the XY plane, and fine jitter correction control can be performed.

[0053] The above are the details of the configuration of this embodiment. The optical component drive device 100 of this embodiment includes, in an XYZ orthogonal coordinate system: an AF module 3 as an optical component, which has a lens body 130 with the Z direction as the direction of the optical axis O and an image sensor 190 that converts light incident through the lens body 130 into an image signal; a fixing part that is provided so as to surround the AF module 3; four magnets 35 that are provided on the outer surface of the AF module 3 so as to surround the optical axis O; and eight coils 4 that are provided on the inner surface of the FPC 5 so as to surround the optical axis O and face the magnets 35. Thus, the AF module 3 is tilted and moved about the axes in the X and Y directions by the electromagnetic force between the magnets 35 and the coils 4. Thereby, an optical component drive device 100 capable of performing fine jitter correction control can be provided.

[0054] Alternatively, in the above-described embodiment, eight coils 4 may be provided in the movable portion, and four magnets 35 may be provided in the fixed portion. Alternatively, eight coils 4 wound around the Z-axis may be arranged on the front surface of the bottom plate 9, and the magnets 35 may be arranged on the rear surface of the AF module 3. In this case, it is preferable that the magnets 35 are arranged such that a single magnetic pole in the Z direction faces the coils 4, and the magnetic flux of at least one component in the X direction or the Y direction passes through the coils 4.

[0055] Alternatively, in the above-described embodiment, two holes may be provided in the four wall portions 61 of the bracket 6, and one coil 4 may be accommodated in each of the two holes.

[0056] Alternatively, when a current flows, an electromagnetic force in the same forward and backward direction may be generated, and two adjacent coils 4 may be electrically connected to form four coil groups. Further, when a current flows, an electromagnetic force in the opposite forward and backward direction may be generated, and two coil groups located on opposite sides sandwiching the optical axis O may be electrically connected. In this case, the two electrically connected coils 4 may be two coils 4 arranged on the same wall portion 61, or two coils 4 arranged on two adjacent wall portions 61. The coils 4 may not be electrically connected to other coils 4 and may independently carry a current. The number of coils 4 is not limited to eight and may be four or the like. In this case, the control is simple.

[0057]

Reference Signs

[0058] 1 Housing; 2 Universal Spring; 3 AF Module; 4 Coil; 5, 8 FPC; 6 Bracket; 7 Frame; 9 Bottom 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 Connection Portion; 25 Second Connection Portion; 31 Inner Housing; 35 Magnet; 37 Base; 49 Hall Element; 61 Wall Portion; 62 Long Hole; 63 Leg; 80 Hole; 81 External Terminal Portion; 82 Body Portion; 83 Image Sensor Connection Portion; 84 External Terminal Connection Portion; 85 Connection Portion; 100 Optical Component Driving Device; 101 Camera Device; 102 Smart Phone; 130 Lens Body; 190 Image Sensor; 191 Sensor Substrate; 811 External Terminal.

Claims

1. An optical component driving device, characterized in that, In an XYZ orthogonal coordinate system, it includes: An optical component having: a lens body with the Z direction as the optical axis direction; and an image sensor that converts the light incident through the lens body into an image signal; A fixing portion that is arranged to surround the optical component; A plurality of magnets that are provided on one of the outer surface of the optical component or the inner surface of the fixing portion so as to surround the optical axis; And Eight coils that are provided on the other of the outer surface of the optical component or the inner surface of the fixing portion so as to surround the optical axis, facing the magnets; By the electromagnetic force between the magnets and the coils, the optical component is tilted and moved around the axes in the X and Y directions; The fixing portion further includes a holding base plate and a bracket for the coils or the magnets; The bracket forms a quadrilateral through four wall portions, and has a leg portion extending rearward at one diagonal of the quadrilateral, and this leg portion is placed and fixed on the front surface of the base plate; The optical component driving device further includes an FPC electrically connected to the image sensor; The FPC has a main body portion, an image sensor connection portion, an external terminal portion, an external terminal connection portion, and a connecting portion; The connecting portion is in an L shape, and its bending angle corresponds to the corner portion of the leg portion where the bracket is not provided. One end of this connecting portion is connected to the front end of the image sensor connection portion extending outward from the periphery of the main body portion, and the other end of this connecting portion is connected to the front end of the external terminal connection portion extending inward from the external terminal portion; The connecting portion of the FPC is located near the center of the space between the rear surface of the bracket and the front surface of the base plate.

2. The optical component driving device according to claim 1, wherein: The coils are electrically connected to two coils located on opposite sides sandwiching the optical axis so as to generate electromagnetic forces in opposite directions in the front-rear direction when a current flows through them.

3. The optical component driving device according to claim 1, wherein: The coils are electrically connected to adjacent two coils to form four coil groups so as to generate electromagnetic forces in the same direction in the front-rear direction when a current flows through them, and two coil groups located on opposite sides sandwiching the optical axis are electrically connected so as to generate electromagnetic forces in opposite directions in the front-rear direction when a current flows through them.

4. The optical component driving device according to claim 1, wherein: Among the eight coils, four coils are wound around a winding shaft in the X direction and face the magnets in the X direction, and the remaining four coils are wound around a winding shaft in the Y direction and face the magnets in the Y direction.

5. The optical component driving device according to claim 1, wherein: All the eight coils are wound around a winding shaft in the Z direction and face the magnets in the Z direction.

6. The optical component driving device according to claim 1, wherein: This optical component driving device further has a gimbal spring; The gimbal spring has an inner frame portion, a middle frame portion, and an outer frame portion, a first connecting portion connecting the inner frame portion and the middle frame portion, and a second connecting portion connecting the middle frame portion and the outer frame portion. The optical component is an AF module, and the AF module includes the lens body, a lens driving device, and the image sensor. The lens driving device is disposed inside an inner frame formed by an inner cover and a base, and includes the lens body and an actuator. The inner frame portion of the gimbal spring is fixed to the periphery of the front plate of the inner cover of the AF module, and the outer frame portion of the gimbal spring is fixed to the front end of the wall portion of the bracket. The AF module is supported in a floating state within the space inside the four wall portions of the bracket.

7. A camera device, characterized in that, An optical component driving device according to any one of claims 1 to 6 is provided.

8. An electronic device, characterized in that, A camera device according to claim 7 is provided.

Images