CN114296294A - 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 control can be performed. An optical component driving device, in an XYZ orthogonal coordinate system, comprises: an AF module having, as an optical member, a lens body, a lens driving device, and an image sensor; and a fixing portion surrounding the AF module to be supported freely in a tilting motion. The lens driving device comprises: a 1 st coil provided in a carrier holding a lens body; and a magnet mounted on an intermediate fixing portion surrounding the carriage and facing the 1 st coil, the fixing portion having eight 2 nd coils facing the magnet. Accordingly, the lens body 1 is moved in the Z direction by the electromagnetic force between the magnet and the 1 st coil, and the AF module is tilted about the X and Y axes by the electromagnetic force between the magnet and the 2 nd coil.

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, a lens 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, a lens driving device for driving the lens body, and an image sensor mounted on the lens driving device and converting light incident through the lens body into an image signal; and a fixing portion that is supported so as to surround the optical member so as to be capable of tilting, the lens driving device including: a 1 st coil provided in a carrier that holds the lens body; and a magnet attached to an intermediate fixing portion surrounding the carrier and facing the 1 st coil, wherein the fixing portion has eight 2 nd coils facing the magnet, the lens body is moved in the Z direction by an electromagnetic force between the magnet and the 1 st coil, and the optical component is tilted about axes in the X and Y directions by the electromagnetic force between the magnet and the 2 nd coil.

In this aspect, the intermediate fixing portion may include a cover that surrounds the carrier, the cover may be formed of a non-magnetic material, and the magnet may be fixed to an inner surface of the cover.

In addition, four of the eight 2 nd coils may be wound around the X-direction axis and the remaining four may be wound around the Y-direction axis, and the fixing portion may be provided with a holder having a wall portion provided with two 2 nd coil holes for accommodating the respective sides of the quadrangle.

In addition, an FPC bent along the outer surfaces of the four wall portions may be provided on the outer surfaces, and the 2 nd coil may be fixed to an inner surface of the FPC.

The 1 st coil may be wound around the axis in the Z direction as a winding axis.

The 1 st coil may be wound around the X and Y axes as winding axes.

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 according to the present invention includes, in an XYZ rectangular coordinate system: an optical member having a lens body, a lens driving device that drives the lens body, and an image sensor that is attached to the lens driving device and converts light incident through the lens body into an image signal; and a fixing portion which surrounds the optical component and is supported in a tilting manner. The lens driving device includes: a 1 st coil provided in a carrier that holds the lens body; and a magnet attached to an intermediate fixing portion surrounding the carriage, the magnet facing the 1 st coil, the fixing portion having eight 2 nd coils facing the magnet. Accordingly, the lens body is moved in the Z direction by the electromagnetic force between the magnet and the 1 st coil, and the optical member is tilted about the X and Y axes by the electromagnetic force between the magnet and the 2 nd coil. 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 apparatus 101 including an optical component driving apparatus 100 according to embodiment 1 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. 1.

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

Fig. 6 is a perspective view of fig. 5 with the inner cover 31 and the front spring 32 removed.

Fig. 7 is a perspective view of fig. 6 with the lens body 130 and the carriage 33 removed.

Fig. 8 is a perspective view of the optical component driving device 100A according to embodiment 2 of the present invention, excluding the outer cover 1, the gimbal springs 2, the inner cover 31, the front side springs 32, the lens body 130, and the carriage 33.

Fig. 9 is a perspective view of the optical component drive device 100B according to embodiment 3 of the present invention, excluding the outer cover 1, the gimbal springs 2, the inner cover 31, the front side springs 32, the lens body 130, and the carriage 33.

Detailed Description

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

< embodiment 1 >

As shown in fig. 1, a camera apparatus 101 including an optical component driving apparatus 100 according to embodiment 1 of the present invention is housed in a housing of a smartphone 102.

The camera apparatus 101 has an AF module 3 as an optical member holding the lens body 130 and the image sensor 190, and an optical member driving apparatus 100 holding the AF module 3. The image sensor 190 converts light incident through the lens body 130 into an image signal and outputs the image signal. Here, the X axis, the Y axis, and the Z axis are orthogonal to each other by an XYZ orthogonal coordinate system. The optical axis direction of the lens body 130 is substantially parallel to the Z direction. 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 (autofocus) module 3, eight 2 nd coils 4, an FPC5, a holder 6, and a bottom plate 9.

The AF module 3 includes a lens body 130, an image sensor 190, and a lens driving device that drives the lens body 130 in the Z-axis direction with respect to the image sensor 190. The lens driving device has an inner cover 31, a front side spring 32, a carriage 33, two 1 st coils 34, four magnets 35, two rear side springs 36, and a base 37. The intermediate fixing portion, which is a fixing portion of the lens driving device, includes an inner cover 31, a magnet 35, and a base 37.

The inner cover 31 may be made of a non-magnetic material, and a magnetic material may be used. The inner cover 31 has a front plate 311 of a quadrangular shape and four side plates 312 extending along the-Z side from four sides of the front plate 311. The inner cover 31 and the quadrangular base 37 are combined as an inner frame. The front plate 311 of the inner cover 31 is provided with a through hole 310, and the base 37 is provided with a through hole 370.

Four magnets 35 are provided on the inner 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 to form opposite magnetic poles in the plate surface direction. Each magnet 35 may be obtained by magnetizing one magnet sheet so as to have the above-described magnetic pole arrangement.

The outer peripheral edge of the front spring 32 is fixed to the peripheral edge of the rear surface of the front plate 311 of the inner cover 31 via a gasket, not shown. The outer peripheral portions of the two rear springs 36 are fixed to the + X side and-X side peripheral portions of the front surface of the base 37, respectively.

The carriage 33 has an octagonal shape in which four corners of a quadrangle are chamfered as viewed from the Z direction. A through hole as a holding portion for holding the lens body 130 is provided in the center of the carriage 33. On the side of the carriage 33, two 1 st coils 34 of the front side and the rear side are provided. The two 1 st coils 34 are wound around the Z axis.

Edges of the through holes of the front surface and the rear surface of the carriage 33 are fixed to an annular portion inside the front spring 32 and an arcuate portion inside the rear spring 36, respectively. The carriage 33 is suspended in the inner frame by the front side spring 32 and the rear side spring 36. The 1 st coil 34 on the side surface of the carriage 33 and the magnet 35 on the inner surface of the side plate 312 of the inner cover 31 oppose each other with a gap therebetween. More specifically, the front 1 st coil 34 faces the front magnet piece, and the rear 1 st coil 34 faces the rear magnet piece.

On the rear surface of the base 37, the image sensor 190 and the FPC8 are mounted via the frame 7. The FPC8 is electrically connected to the body of the camera device 101, the image sensor 190, and the 1 st coil 34.

As shown in fig. 2 and 3, the housing 1 has a front plate 11 having a quadrangular shape and four side plates 12 extending along the-Z side from four sides of the front plate 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.

A rectangular bracket 6 is mounted and fixed on the front surface of the bottom plate 9. The bracket 6 has a leg 63 extending rearward at one diagonal corner, and the leg 63 is placed on and fixed to the front surface of the bottom plate 9. An FPC8 described later is located in a space between the holder 6 and the chassis 9.

The holder 6 is a rectangular frame-like body having two pairs of wall portions 61 facing in the X direction and the Y direction. A recessed portion recessed inward is provided on the outer surface of the wall portion 61 of the bracket 6 except for a corner portion where the wall portion 61 on the-X side and the wall portion 61 on the + Y side intersect. On the recess, FPC5 is fixed. FPC5 is bent along the recess. The FPC5 electrically connects the main body of the camera device 101 to the 2 nd coil 4 and the hall element 49 described later.

The four wall portions 61 are provided with long holes 62. The eight 2 nd coils 4 are accommodated in the elongated holes 62 of the four wall portions 61 two by two in the longitudinal direction of each side of the quadrangle. The 2 nd coil 4 fixed to the wall portion 61 facing in the X direction is wound around the X axis, and the 2 nd 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 2 nd coil 4 on the Y side of the coil 4 fixed to the wall portion 61 on the + X side, the 2 nd coil 4 on the + Y side of the 2 nd coil 4 fixed to the wall portion 61 on the-X side, and the 2 nd coil 4 on the X side of the 2 nd coil 4 fixed to the wall portion 61 on the-Y side. The 2 nd coil 4 and the hall element 49 are fixed to the inner surface of the FPC 5. The 3 hall elements 49 are used to detect the amount of tilt of the AF module 3.

Preferably, for example, two 2 nd coils 4 which are to be located on opposite sides with respect to the optical axis by eight 2 nd coils 4 are electrically connected in series, respectively, and a group of four 2 nd coils is provided. When a current flows through the two 2 nd coils 4, electromagnetic forces of the same magnitude and oppositely oriented in the front-rear direction are generated. Thus, without generating an unnecessary force for moving the AF module 3 in the Z direction, the AF module 3 can be tilted with the direction orthogonal to the line connecting the two 2 nd coils 4 as the axial direction.

As shown in fig. 4, the universal spring 2 includes an inner frame portion 21, a middle frame portion 22, an outer frame portion 23, a 1 st coupling portion 24 that couples the middle center portions of the inner frame portion 21 and the middle frame portion 22 in the X direction, and a 2 nd coupling portion 25 that couples the middle center portions of the middle frame portion 22 and the outer frame portion 23 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 23 of the universal spring 2 is mounted and fixed to the front end of the wall portion 61 of the bracket 6. The AF module 3 is supported in a state of floating in the space inside the wall portion 61 of the bracket 6 by the gimbal spring 2. The magnet 35 facing the 1 st coil 34 in the AF module 3 faces the side plate 312 of the AF module 3 across the 2 nd coil 4 on the holder 6. More specifically, the front magnet piece of the magnet 35 faces the front portion of the 2 nd coil 4, and the rear magnet piece faces the rear portion of the 2 nd coil 4.

The magnet 35 drives the carriage 33 and the lens body 130 in the AF module 3 in the optical axis direction by electromagnetic force with the 1 st coil 34, and drives the AF module 3 around the axes in the X and Y directions by electromagnetic force with the 2 nd coil 4.

The above is the configuration details of embodiment 1. The optical component driving device 100 according to embodiment 1 includes, in an XYZ rectangular coordinate system: an AF module 3 having, as optical components, a lens body 130, a lens driving device for driving the lens body 130, and an image sensor 190 attached to the lens driving device for converting light incident on the lens body 130 into an image signal; and a fixing portion which surrounds the AF module 3 and is supported freely in a tilting motion. A lens driving device includes: a 1 st coil 34 provided in a carrier 33 holding the lens body 130; and a magnet 35 attached to an intermediate fixing portion surrounding the carriage 33 and facing the 1 st coil 34, the fixing portion having eight 2 nd coils 4 facing the magnet 35. Accordingly, the lens body 130 is moved in the Z direction by the electromagnetic force between the magnet 35 and the 1 st coil 34, and the movable AF module 3 is tilted around the axis circumference in the X and Y directions by the electromagnetic force between the magnet 35 and the 2 nd coil 4. This makes it possible to provide the optical member driving device 100 capable of performing fine shake correction control.

< embodiment 2 >

In embodiment 1 described above, the 1 st coil 34 is wound around the Z axis as a winding axis on the side surface of the carriage 33. In contrast, in embodiment 2, the 1 st coil 34 is wound around the X axis and the Y axis.

As shown in fig. 8, in embodiment 2, one 1 st coil 34 is fixed to each of two side surfaces of the carriage 33 facing in the X direction and two side surfaces facing in the Y direction. The two 1 st coils 34 on the side surfaces facing in the X direction are wound around the X axis. The two 1 st coils 34 on the side surfaces facing in the Y direction are wound around the Y axis. The four 1 st coils 34 are opposed to the magnets 35, respectively. More specifically, the front portion of the 1 st coil 34 faces the front magnet piece, and the rear portion faces the rear magnet piece. According to embodiment 2, the same effects as those of embodiment 1 can be obtained.

< embodiment 3 >

In embodiment 2 described above, the number of the 1 st coils 34 is four. In contrast, in embodiment 3, the number of the 1 st coils 34 is two.

As shown in fig. 9, in embodiment 3, one 1 st coil 34 is fixed to each of two side surfaces of the carriage 33 facing in the X direction, and the 1 st coil 34 is not fixed to the side surface facing in the Y direction. In this case, the magnets 35 on the + Y side and the-Y side do not face the 1 st coil 34, but face only the 2 nd coil 4. According to embodiment 3, the same effects as those of embodiments 1 and 2 can be obtained.

In the above embodiments 1 to 3, the inner cover 31 may be omitted. For example, the magnet 35 and the front side spring 32 may be attached to the base 37.

In addition, in the above-described embodiments 1 to 3, in order to generate electromagnetic forces in the same direction in the front-rear direction when a current flows, two adjacent 2 nd coils 4 may be electrically connected to form four coil groups, and in order to generate electromagnetic forces in opposite directions in the front-rear direction when a current flows, two coil groups on opposite sides of the optical axis may be electrically connected. In this case, the two electrically connected 2 nd coils 4 may be two 2 nd coils 4 arranged on the same wall portion 61, or two 2 nd coils 4 arranged on two adjacent wall portions 61. The 2 nd coil 4 may be independently supplied with current without being electrically connected to the other 2 nd coil 4. The number 2 coil 4 is not limited to eight, and may be four or the like. In this case, the control is simple. Two holes may be provided in the four wall portions 61 of the holder 6, and one 2 nd coil 4 may be accommodated in each of the two holes.

[ notation ] to show

1, covering the shell; 2, a universal spring; a 3AF module; 4, 2 nd coil; 58 FPC; 6, a bracket; 7 a frame body; 9 a bottom plate; 10. 310, 370 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; 32 a front side spring; 33 a carrier; 34, 1 st coil; 35 a magnet; 36 a rear side spring; 37 a base; 49 Hall elements; 61 wall portion; 62 long holes; 63 a leg portion; 100. 100A, 100B optical component driving device; 101 a camera device; 102 a smart phone; 130 a lens body; 190 image sensor.

Claims (8)

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

an optical member having a lens body, a lens driving device that drives the lens body, and an image sensor that is mounted on the lens driving device and converts light incident via the lens body into an image signal; and

a fixed part surrounding the optical component and being supported in a manner of tilting freely,

the lens driving device includes: a 1 st coil provided in a carrier that holds the lens body; and a magnet mounted on an intermediate fixing portion surrounding the carriage so as to oppose the 1 st coil,

the fixing portion has eight No. 2 coils facing the magnet,

the lens body is moved in the Z direction by an electromagnetic force between the magnet and the 1 st coil, and the optical member is tilted about the X and Y axes by an electromagnetic force between the magnet and the 2 nd coil.

2. Optical component driving device according to claim 1,

the intermediate fixing portion has a cover that surrounds the carrier, the cover being formed of a non-magnetic material, and the magnet being fixed to an inner surface thereof.

3. Optical component driving device according to claim 1,

four of the eight 2 nd coils are wound around the X-direction axis as winding axes, and the remaining four are wound around the Y-direction axis as winding axes,

the fixing portion has a holder having a wall portion provided with 2 coil 2 holes respectively received in each side of a quadrangle.

4. Optical component driving device according to claim 1,

the outer surfaces of the four wall parts are provided with FPC bent along the outer surfaces,

the 2 nd coil is fixed on the inner surface of the FPC.

5. Optical component driving device according to claim 1,

the 1 st coil is wound around the Z-direction axis as a winding axis.

6. Optical component driving device according to claim 1,

the 1 st coil is wound around the X and Y axes as winding axes.

7. A camera device comprising the optical member driving device according to any one of claims 1 to 6.

8. An electronic device comprising the camera device according to claim 7.

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