CN114296295A - Optical member driving device, camera device, and electronic apparatus - Google Patents

Abstract

The invention provides an optical member driving device, a camera device and an electronic apparatus, wherein fine jitter correction can be performed. An optical component driving device (100) is provided with: an AF module (3) which is an optical component and has a lens body (130) with the Z direction as the direction of an optical axis (O), and an image sensor (190) which converts light incident through the lens body (130) into an image signal; a fixing portion provided so as to surround the AF module (3); four magnets (35) provided on the outer surface of the AF module (3) so as to surround the optical axis (O); eight coils (4) provided on the inner surface of the FPC (5) so as to surround the optical axis (O) and facing the magnets (35). Thus, the AF module (3) is tilted about the axes in the X and Y directions by the electromagnetic force between the magnet (35) and the coil (4).

Description

Optical member driving device, camera device, and electronic apparatus

Technical Field

The present invention relates to an optical component driving device, a camera device, and an electronic apparatus used for an electronic apparatus such as a smartphone.

Background

In a camera apparatus used for an electronic device such as a smartphone, a coil and a magnet are provided on a carrier that holds a lens body and a holder that holds the carrier, respectively, and the magnitude of current flowing through each coil is individually controlled to realize autofocus control or shake correction. As a document disclosing a technique related to such a camera device, there is patent document 1.

The imaging 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 on the imaging element by the lens. The shake correction device includes a support body that swingably supports the camera module, and a swing drive mechanism that swings the camera module to correct a shake in order to tilt an optical axis of a support body lens. 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 facing each other from the outside of each shake correction magnet.

[ Prior art documents ]

[ patent document ]

[ patent document 1 ] Japanese patent application laid-open No. 2011-257506A

Disclosure of Invention

[ problem to be solved by the invention ]

However, the technique of patent document 1 has a problem that four pairs of coils and magnets are arranged around the camera module, and the control is not uniform.

The present invention has been made in view of the above problems, and an object thereof is to provide an optical component driving device capable of performing fine shake correction control.

[ MEANS FOR SOLVING PROBLEMS ] to solve the problems

In order to solve the above problem, an optical component driving device according to a preferred embodiment of the present invention includes, in an XYZ orthogonal coordinate system: an optical member including a lens body having an optical axis in a Z direction, and an image sensor for converting light incident through the lens body into an image signal; a fixing portion provided so as to surround the optical member; a plurality of magnets provided on one of an outer surface of the optical component or an inner surface of the fixing portion so as to surround the optical axis; and eight coils provided on the other of an outer surface of the optical component or an inner surface of the fixing portion so as to surround the optical axis, facing the magnets, and configured to tilt the optical component about axes in the X and Y directions by electromagnetic force between the magnets and the coils.

The coils may be electrically connected to each other on the opposite side with respect to the optical axis so as to generate electromagnetic forces in opposite directions in the front-rear direction when a current flows.

The coils may be configured such that the two adjacent coils are electrically connected to each other so as to generate electromagnetic forces in the same direction in the front-rear direction when a current flows, and the two coil groups on the opposite side from the optical axis may be electrically connected to each other so as to generate electromagnetic forces in opposite directions in the front-rear direction when a current flows.

In the eight coils, four of the coils may be wound around the magnet with the X-direction as a winding axis and may face the magnet in the X-direction, and the remaining four of the coils may be wound around the magnet with the Y-direction as a winding axis and may face the magnet in the Y-direction.

The eight coils may be wound around a winding shaft in the Z direction, and may face the magnet in the Z direction.

The fixing portion may further include a bracket that holds the base plate and the coil or the magnet, the bracket may be formed into a quadrangle by four wall portions, the bracket may have a leg portion extending rearward at one diagonal of the quadrangle, and the leg portion may be placed and fixed on a front surface of the base plate.

Further, the image sensor may further include an FPC electrically connected to the image sensor, and the FPC may be located in a space between the rear surface of the holder and the front surface of the chassis.

A camera device according to another preferred embodiment of the present invention includes the optical member driving device.

An electronic device according to another preferred embodiment of the present invention includes the camera device.

[ Effect of the invention ]

An optical component driving device of the present invention includes, in an XYZ orthogonal coordinate system: an optical member having a lens body having a Z direction as an optical axis and an image sensor for converting light incident through the lens body into an image signal; a solid portion provided so as to surround the optical member; a plurality of magnets provided on one of an outer surface of the optical component or an inner surface of the fixing portion so as to surround the optical axis; and eight coils provided on the other of an outer surface of the optical component or an inner surface of the fixing portion so as to surround the optical axis, the eight coils facing the magnet, and the optical component being tilted about axes in the X and Y directions by an electromagnetic force between the magnet and the coils. Thus, an optical member driving device capable of performing fine shake correction control can be provided.

Drawings

Fig. 1 is a front view of a smartphone 102 equipped with a camera device 101 including an optical component drive device 100 according to an embodiment of the present invention.

Fig. 2 is a perspective view of the optical component driving apparatus 100 of fig. 1.

Fig. 3 is a perspective view of the optical component driving apparatus 100 of fig. 2 exploded.

Fig. 4 is a perspective view of the cover 1 removed from fig. 2.

Fig. 5 is a perspective view of fig. 4 with the gimbal spring 2 removed.

Fig. 6 is a perspective view of the image sensor section of fig. 3.

Fig. 7 is a perspective view of fig. 6 with the frame 7 removed.

Fig. 8 is a perspective view of the angle change in fig. 4.

Fig. 9 is a perspective view of fig. 2, with the bottom plate 9 removed, as viewed from the inside.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings. As shown in fig. 1, a camera apparatus 101 including an optical component driving apparatus 100 as one embodiment of the present invention is housed in a housing of a smartphone 102.

The camera apparatus 101 has an optical member driving apparatus 100. Here, the X axis, the Y axis, and the Z axis are orthogonal to each other by an XYZ orthogonal coordinate system. The direction of the optical axis O of the lens body 130 is parallel to the Z direction in the initial state. Further, the side of the subject viewed from the lens body 130 is the + Z side, which is sometimes referred to as the front side, and the opposite side (the side of the image sensor 190) is the-Z side, which is sometimes referred to as the rear side.

As shown in fig. 3, the optical component driving device 100 includes a housing 1, a gimbal spring 2, an af (auto focus) module 3 as an optical component, four magnets 35, eight coils 4, an FPC5, a holder 6, and a bottom plate 9. The housing 1 and the bottom plate 9 form an outer frame in which the components are housed. Of these parts, the AF module 3 and the four magnets 35 constitute a movable part. The cover 1, the eight coils 4, the FPC5, the holder 6, and the bottom plate 9 constitute a fixing portion. The gimbal spring 2 connects the movable portion and the fixed portion, and is supported so as to be capable of tilting about the axis in the X and Y directions with respect to the movable portion fixed portion. Here, the tilt movement in the direction around the axis in the X and Y directions also includes a tilt movement in the direction around the axis in the direction intermediate between the X and Y directions. In the present embodiment, the optical member driving device 100 is a device that performs shake correction by tilting the AF module 3 about the X and Y axis directions.

The AF module 3 has a lens body 130, a lens driving device, and an image sensor portion. The lens driving device includes a lens body 130 and an actuator (not shown) inside an inner frame body constituted by the inner cover 31 and the base 37. The image sensor unit includes a housing 7, an FPC8, a sensor substrate 191, and an image sensor 190, and is attached to 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 drive source of the actuator include a magnet, a coil, a piezoelectric element, and a shape memory alloy, but are not limited thereto. In addition, the focus may be fixed without providing an actuator. Conversely, a plurality of lens bodies 130 may be driven.

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

Four magnets 35 are provided on the outer surfaces of the four side plates 312 of the inner cover 31. For each magnet 35, two rectangular parallelepiped magnet pieces are arranged in parallel in the Z direction. The two magnet sheets are magnetized so that the magnetic poles in the plate surface direction become opposite magnetic poles. Each magnet 35 may be obtained by magnetizing one magnet sheet so that the magnetic poles are arranged.

The image sensor unit is configured such that the image sensor 190 is mounted together with the sensor substrate 191 at the center of the FPC8, and the housing 7 is mounted on the FPC8 from the front side of the image sensor 190. The frame 7 is attached to the rear surface of the base 37. The image sensor 190 has a rectangular shape, is located directly behind the lens body 130, and converts light incident through the lens body 130 into an image signal and outputs the image signal.

The FPC8 electrically connects the body of the camera device 101 and the image sensor 190 and the actuator of the AF module 3.

The housing 1 has a front panel 11 and four side panels 12 extending along the-Z side from four sides of the front panel 11. The housing 1 and the bottom plate 9 are combined as an outer frame. The front plate 11 of the housing 1 is provided with a through hole 10. The four wall portions 61 of the holder 6 face each other in the X and Y directions.

The holder 6 is a rectangular frame-shaped body having 2 pairs of wall portions 61 facing in the X direction Y direction, and a leg portion 63 extending rearward is provided at one diagonal. The leg 63 is mounted and fixed on the front surface of the base plate 9. A recessed portion recessed inward is provided on the outer surface of wall portion 61 of bracket 6 except for a corner portion where wall portion 61 on the X side and wall portion 61 on the + Y side intersect. An FPC5 is fixed in the recess. FPC5 is bent along the recess. The FPC5 electrically connects the main body of the camera device 101 to the coil 4 and the hall element 49 described later.

The four wall portions 61 are provided with long holes 62. The eight coils 4 are accommodated in the elongated holes 62 of the four wall portions 61 two by two along each side length direction of the quadrangle. The coil 4 fixed to the wall portion 61 facing in the X direction is wound around the X axis, and the coil 4 fixed to the wall portion 61 facing in the Y direction is wound around the Y axis. One hall element 49 is disposed in each of the hollow portions of the Y-side coil 4 of the coils 4 fixed to the + X-side wall portion 61, the + Y-side coil 4 of the coils 4 fixed to the-X-side wall portion 61, and the X-side coil 4 of the coils 4 fixed to the-Y-side wall portion 61. The coil 4 and the hall element 49 are fixed to the inner surface of the FPC5, and face the magnet 35.

Preferably, for the eight coils 4, for example, two coils 4 on opposite sides with respect to the optical axis O are electrically connected in series, respectively, and a set of four coils is provided. When a current flows through the two coils 4, electromagnetic forces are generated that are opposite in the front-rear direction and have the same magnitude. Thus, without generating an unnecessary force for moving the AF module 3 in the Z direction, the AF module 3 can be tilted in the axial direction, which is the direction orthogonal to the line connecting the two coils 4.

Two hall elements 49 of the 3 hall elements 49 are arranged at positions separated from each other on opposite sides with respect to 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 in which the two hall elements 49 are coupled. That is, 3 hall elements 49 are arranged at 90-degree intervals around the optical axis O. The hall element 49 detects a magnetic field from the magnet 35 facing the hall element 49, and outputs a signal indicating the detection result. The signal corresponds to the position of the magnet 35 in the Z direction, which is opposed to the hall element 49. By deriving the position in the Z direction, even if the position in the Z direction of the AF module 3 is shifted during the tilt movement, the shift amount can be detected, and therefore, an accurate tilt can be derived. The 3 hall elements 49 are located at equal distances from the optical axis O.

The universal spring 2 includes an inner frame portion 21, an intermediate frame portion 22, and an outer frame portion 23. The inner frame portion 21 and the outer frame portion 22 are coupled by a 1 st coupling portion 24 at the midpoint in the X direction, and the inner frame portion 22 and the outer frame portion 23 are coupled by a 2 nd coupling portion 25 at the midpoint in the Y direction.

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 universal spring 2 is fixed to the front end of the wall portion 61 of the bracket 6. The AF module 3 and the magnet 35 as the movable portions are supported by the gimbal springs 2 in a state of floating in the space inside the four wall portions 61 of the holder 6.

The FPC8 is a point-symmetric thin plate. The FPC8 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 has a rectangular shape. A hole is provided in the center of the body portion 82, the image sensor 190 is fixed to the sensor substrate 191 so as to be fitted into the hole from the rear side, and the body portion 82 is fixed to the front surface of the sensor substrate 191.

Two image sensor connecting portions 83, two external terminal portions 81, two external terminal connecting portions 84, and two connecting portions 85 are provided, and are located at point-symmetrical positions with respect to the center of the image sensor 190. The image sensor connecting portion 83 extends outward, that is, in the + X direction and the-X direction, from the base end of the position closer to the Y side among the + X side and the base end of the position closer to the + Y side among the-X side of the peripheral edge of the main body portion 82, respectively. The front end of the image sensor connecting portion 83 is connected to one end of the connecting portion 85.

The coupling portion 85 has an L-shape, and the bent angle thereof corresponds to the corner of the leg portion 8 where the bracket 6 is not provided. The coupling portion 85 is bent at a right angle from a portion adjacent to the image sensor coupling portion 83, extends in the + Y direction along the + X side, surrounds the outside of the corner portion of the main body portion 82, and extends in the X direction along the + Y side. On the other hand, the side along the-X side extends in the-Y direction, and the side along the-Y side extends in the + X direction around the outside of the corner portion of the body portion 82. The other end of the coupling portion 85 is connected to the tip of the external terminal connecting portion 84. That is, one of the two L-shaped coupling portions 85 is provided along the 2 side of the rectangular main body 82, and the other is provided along the remaining 2 side of the main body 82. The coupling portion 85 is located in a space between the rear surface of the bracket 6 formed by the leg portions 63 and the front surface of the bottom plate 9, and is located near the center therebetween. Thus, even if the AF module 3 is tilted and the FPC8 moves forward and backward, unnecessary contact with other parts is unlikely to occur.

The external terminal connecting portion 84 extends from the base end of the external terminal portion 81 side in the-Y direction and the + Y direction, which are inward directions, 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. In the external terminal connecting portion 84, the FPC8 is projected to the outside of the optical component driving device 100 from a gap between the housing 1 and the bottom plate 9 formed by a cutout provided in the housing 1, and the external terminal 811 is connected to and fixed to an external substrate. The direction in which the image sensor connecting portion 83 extends from the main portion 82 and the direction in which the external terminal connecting portion 84 extends from the external terminal portion 81 are orthogonal to each other.

A control unit (not shown) is provided on the FPC 5. The control unit performs: detection control of determining the tilt with respect to the Z axis of the movable portion based on the output signals of the 3 hall elements 49 of the movable portion; and drive control for individually controlling the current flowing through the coil 4 based on the result to operate the movable portion. The control unit may be provided outside the optical component driving apparatus 100.

In the detection control, the control unit first calculates an average value of output signals of two hall elements 49 arranged at positions separated from each other on opposite sides with respect to the optical axis O among the 3 hall elements 49, and calculates the Z-direction position of the movable portion based on the average value. The difference between the average value and any output signal of the two Hall elements 49 is calculated, and the deviation between the Z-direction position of the movable part and the Z-direction position of the magnet 35 is calculated based on the difference. The amount of inclination of the in-plane movable portion 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 magnet 35 in the Z direction. 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 3 rd hall element 49) is calculated, and the deviation between the Z-direction position of the movable portion and the Z-direction position of the magnet 35 is calculated based on the difference. The amount of inclination of the surface formed by the magnet 35 and the optical axis O facing the remaining one hall element 49 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 magnet 35 in the Z direction.

The control unit causes a current to flow through the coil 4 so that the AF module 3 can be appropriately tilted for the purpose of shake correction during drive control. When a current flows through the two predetermined coils 4 located on opposite sides of the optical axis O, electromagnetic forces of the same magnitude and opposite directions are generated in the front-rear direction. Since the number of the coil groups 4 generating electromagnetic force in the opposite directions with respect to the optical axis O is 4, the AF module 3 can be tilted about the axis in the predetermined direction in the XY plane by passing an appropriate current through each coil group 4, and fine jitter correction control can be performed.

The above is the details of the configuration of the present embodiment. The optical component driving device 100 of the present embodiment includes, in an XYZ rectangular coordinate system: an AF module 3 as an optical member having a lens body 130 with a Z direction as a direction of an optical axis O and an image sensor 190 that converts light incident via the lens body 130 into an image signal; a fixing portion provided to surround the AF module 3; four magnets 35 provided on the outer surface of the AF module 3 so as to surround the optical axis O; and eight coils 4 provided on the inner surface of the FPC5 so as to surround the optical axis O and facing the magnets 35. Accordingly, the AF module 3 is tilted about the X and Y axes by the electromagnetic force between the magnet 35 and the coil 4. This makes it possible to provide the optical member driving device 100 capable of performing fine shake correction control.

In the above embodiment, eight coils 4 may be provided in the movable portion, and four magnets 35 may be provided in the fixed portion. Eight coils 4 wound around the Z-direction may be disposed on the front surface of the base plate 9, and a magnet 35 may be disposed on the rear surface of the AF module 3. In this case, the magnet 35 is preferably arranged such that a single magnetic pole faces the coil 4 in the Z direction, and a magnetic flux having at least one component in the X direction or the Y direction crosses the coil 4.

In the above embodiment, 2 holes may be provided in the four wall portions 61 of the holder 6, and one coil 4 may be accommodated in each of the two holes.

When a current flows, electromagnetic forces in the same direction in the front-rear direction are generated, and two adjacent coils 4 are electrically connected to form four coil groups, and when a current flows, electromagnetic forces in opposite directions in the front-rear direction are generated, and two coil groups on opposite sides of the optical axis O may be electrically connected. In this case, the two coils 4 to be electrically connected may be two coils 4 arranged on the same wall portion 61, or two coils 4 arranged on two adjacent wall portions 61. The coil 4 is not electrically connected to the other coils 4, and a current can flow independently. The number of coils 4 is not limited to eight, and may be four. In this case, the control is simple.

[ notation ] to show

1, covering the shell; 2, a universal spring; a 3AF module; 4, coils; 5. 8 FPC; 6, a bracket; 7 a frame body; 9 a bottom plate; 10 through holes; 11. 311 a front plate; 12. 312 side plates; 21 an inner frame portion; 22 a middle frame portion; 23 an outer frame portion; 24 the 1 st joint; 25 the 2 nd connecting part; 31 an inner cover; 35 a magnet; 37 a base; 49 Hall elements; 61 wall portion; 62 long holes; 63 a leg portion; 80 holes; 81 external terminal portions; 82 a body portion; 83 an image sensor connection part; 84 an external terminal connection portion; 85 a connecting part; 100 an optical component driving device; 101 a camera device; 102 a smart phone; 130 a lens body; 190 an image sensor; 191 a sensor substrate; 811 external terminals.

Claims (9)

1. An optical component driving device is characterized by comprising, in an XYZ orthogonal coordinate system:

an optical member, comprising: a lens body having a Z direction as an optical axis; and an image sensor that converts light incident via the lens body into an image signal;

a fixing portion provided so as to surround the optical member;

a plurality of magnets provided on one of an outer surface of the optical component or an inner surface of the fixing portion so as to surround the optical axis; and

eight coils provided on the other of an outer surface of the optical component or an inner surface of the fixing portion so as to surround the optical axis and facing the magnet,

the optical component is tilted about axes in the X and Y directions by an electromagnetic force between the magnet and the coil.

2. Optical component driving device according to claim 1,

the coils are electrically connected to two coils located on opposite sides of the optical axis so as to generate electromagnetic forces in opposite directions in a front-rear direction when a current flows.

3. Optical component driving device according to claim 1,

the coils are electrically connected to each other to form four coil groups so as to generate electromagnetic forces of the same direction in the front-rear direction when a current flows, and to electrically connect the two coil groups on opposite sides of the optical axis so as to generate electromagnetic forces of opposite directions in the front-rear direction when a current flows.

4. Optical component driving device according to claim 1,

of the eight coils, four coils are wound around the magnet with the X-direction as a winding axis and face the magnet in the X-direction, and the remaining four coils are wound around the magnet with the Y-direction as a winding axis and face the magnet in the Y-direction.

5. Optical component driving device according to claim 1,

all of the eight coils are wound around a winding shaft in the Z direction, and face the magnet in the Z direction.

6. Optical component driving device according to claim 1,

the fixing portion further includes a holder for holding the base plate and the coil or the magnet,

the bracket is formed in a quadrilateral shape by four wall portions, and has a leg portion extending rearward at one diagonal of the quadrilateral shape, and the leg portion is placed and fixed on the front surface of the bottom plate.

7. Optical component driving device according to claim 6,

further comprises an FPC electrically connected to the image sensor,

the FPC is located in a space between the rear surface of the bracket and the front surface of the chassis.

8. A camera device comprising the optical member driving device according to any one of claims 1 to 7.

9. An electronic device comprising the camera device according to claim 8.

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