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, in which fine shake correction control can be performed. The optical component driving device includes, in an XYZ orthogonal coordinate system: an AF module that, as an optical component, includes a lens body, a lens driving device, and an image sensor; and a fixing portion that freely supports the AF module in a tiltable manner while surrounding it. The lens driving device includes: a first coil provided on a carrier that holds the lens body; and a magnet mounted on an intermediate fixing portion that surrounds the carrier and faces the first coil. The fixing portion has eight second coils that face the magnet. Thus, the lens body is moved along the Z direction by the electromagnetic force between the magnet and the first coil, and the AF module is tiltably moved about the axes in the X and Y directions by the electromagnetic force between the magnet and the second coils.

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 that holds a lens body and a bracket that holds 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 that discloses a technology 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 the 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]

Summary of the Invention

[0008]

Problems to be Solved by the Invention

[0009] However, the problem with the technology of Patent Document 1 is that it only circulates four pairs of coils and magnets around the camera module, and the control is rough.

[0010] The present invention has been completed in view of such problems, and an object thereof is to provide an optical component driving device capable of performing fine shake correction control.

[0011]

Means for Solving the Problems

[0012] In order to solve the above problems, in a lens driving device which is a preferred embodiment of the present invention, it is characterized in that in an XYZ orthogonal coordinate system, it includes: an optical component which includes a lens body, a lens driving device for driving the lens body, and an image sensor which is mounted on 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 supports it in a tiltable manner. The lens driving device has: a first coil which is provided on a carrier for holding the lens body; and a magnet which is mounted on an intermediate fixing portion surrounding the carrier and faces the first coil. The fixing portion has eight second coils facing the magnet. The lens body is moved along the Z direction by the electromagnetic force between the magnet and the first coil, and the optical component is tiltably moved around the axes in the X and Y directions by the electromagnetic force between the magnet and the second coils.

[0013] In this embodiment, it may also be that the intermediate fixing portion has a cover surrounding the carrier. The cover is formed of a non-magnetic material, and the magnet is fixed on its inner surface.

[0014] Alternatively, four of the eight second coils are wound around the axis in the X direction, and the remaining four are wound around the axis in the Y direction. The fixing portion is provided with a bracket which has a wall portion provided with holes for respectively accommodating two of the second coils on each side of a quadrilateral.

[0015] Alternatively, on the outer surfaces of the four wall portions, there is provided an FPC which is bent along the outer surface, and the second coil is fixed on the inner surface of the FPC.

[0016] Alternatively, the first coil is wound around the axis in the Z direction.

[0017] Alternatively, the first coil is wound around the axes in the X and Y directions.

[0018] A camera device which is another preferred embodiment of the present invention is characterized in that it includes the above optical component driving device.

[0019] An electronic device which is another preferred embodiment of the present invention is characterized in that 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, a lens driving device for driving the lens body, and an image sensor mounted on the lens driving device and configured to convert light incident through the lens body into an image signal; and a fixing portion that surrounds the optical component and supports it so as to be tiltable freely. The lens driving device includes: a first coil provided on a carrier that holds the lens body; and a magnet mounted on an intermediate fixing portion that surrounds the carrier and faces the first coil. The fixing portion has eight second coils that face the magnet. Thus, the lens body is moved along the Z direction by the electromagnetic force between the magnet and the first coil, and the optical component is tiltably moved about the axes in the X and Y directions by the electromagnetic force between the magnet and the second coils. Thereby, an optical component driving device capable of performing fine shake correction control can be provided.

[0022]

Brief Description of the Drawings

[0023] Figure 1 It is a front view of a smartphone 102 equipped with a camera device 101 including the optical component driving device 100 according to the first embodiment of the present invention.

[0024] Figure 2 It is Figure 1 a perspective view of the optical component driving device 100.

[0025] Figure 3 It is an exploded Figure 2 perspective view of the optical component driving device 100.

[0026] Figure 4 It is a perspective view of removing the outer cover 1 from Figure 1 it.

[0027] Figure 5 It is a perspective view of removing the gimbal spring 2 from Figure 4 it.

[0028] Figure 6 It is a perspective view of removing the inner cover 31 and the front spring 32 from Figure 5 it.

[0029] Figure 7 It is a perspective view of removing the lens body 130 and the carrier 33 from Figure 6 it.

[0030] Figure 8 It is a perspective view of removing the outer cover 1, the gimbal spring 2, the inner cover 31, the front spring 32, the lens body 130, and the carrier 33 from the optical component driving device 100A according to the second embodiment of the present invention.

[0031] Figure 9 This is a perspective view of the optical component driving device 100B according to the third embodiment of the present invention, with the outer cover 1, gimbal spring 2, inner cover 31, front spring 32, lens body 130, and carrier 33 removed.

[0032]

Embodiments of the Invention

[0033] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

[0034] <First Embodiment>

[0035] As Figure 1 shown, a camera device 101 including the optical component driving device 100 according to the first embodiment of the present invention is housed in the housing of a smartphone 102.

[0036] The camera device 101 has an AF module 3 that holds the lens body 130 and the image sensor 190 as optical components, and an optical component driving device 100 that holds the optical components of the AF module 3. The image sensor 190 converts the light incident through the lens body 130 into an image signal and outputs it. Here, using an XYZ orthogonal coordinate system, the X-axis, Y-axis, and Z-axis are orthogonal to each other. The optical axis direction of the lens body 130 is substantially parallel to the Z direction. 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 (the image sensor 190 side) is the -Z side, sometimes referred to as the rear side.

[0037] As Figure 3 shown, the optical component driving device 100 has an outer cover 1, a gimbal spring 2, an AF (Auto Focus) module 3, eight second coils 4, an FPC 5, a bracket 6, and a bottom plate 9.

[0038] The AF module 3 has a lens body 130, an image sensor 190, and a lens driving device that drives the lens body 130 in the Z-axis direction relative to the image sensor 190. The lens driving device has an inner cover 31, a front spring 32, a carrier 33, two first coils 34, four magnets 35, two rear springs 36, and a base 37. Among them, the intermediate fixing part, which is the fixing part of the lens driving device, includes the inner cover 31, the magnets 35, and the base 37.

[0039] The inner cover 31 can be made of a non-magnetic material or a magnetic material. The inner cover 31 has a quadrilateral front plate 311 and four side plates 312 extending along the -Z side from the four sides of the front plate 311. The inner cover 31 and the quadrilateral base 37 are combined as an inner housing. A through hole 310 is provided in the front plate 311 of the inner cover 31, and a through hole 370 is provided in the base 37.

[0040] On the inner 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 rectangular parallelepiped are arranged side by side along 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.

[0041] On the periphery of the rear surface of the front plate 311 of the inner cover 31, the peripheral portion of the outer side of the front side spring 32 is fixed via a gasket (not shown). On the +X side and -X side peripheries of the front surface of the base 37, the peripheral portions of the outer sides of the two rear side springs 36 are respectively fixed.

[0042] When viewed from the Z direction, the carrier 33 has an octagonal outer shape with the four corners of a quadrilateral chamfered. At the center of the carrier 33, a through hole is provided as a holding portion for holding the lens body 130. On the side surface of the carrier 33, two first coils 34, one on the front side and one on the rear side, are provided. The two first coils 34 are wound around the Z axis as a winding axis.

[0043] The edges of the through holes on the front surface and the rear surface of the carrier 33 are respectively fixed to the inner circular ring portion of the front side spring 32 and the inner arc-shaped portion of the rear side spring 36. The carrier 33 is suspended inside the inner frame by the front side spring 32 and the rear side spring 36. The first coils 34 on the side surface of the carrier 33 and the magnets 35 on the inner surfaces of the side plates 312 of the inner cover 31 face each other with a gap therebetween. More specifically, the front first coil 34 faces the front magnet piece, and the rear first coil 34 faces the rear magnet piece.

[0044] On the rear surface of the base 37, the image sensor 190 and the FPC 8 are mounted via the frame 7. The FPC 8 is electrically connected to the main body of the camera device 101, the image sensor 190, and the first coils 34.

[0045] As Figure 2 and Figure 3 shown, the outer cover 1 has a quadrilateral 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.

[0046] On the front surface of the bottom plate 9, a quadrilateral bracket 6 is placed and fixed. The bracket 6 has a leg 63 extending rearward at one diagonal, and the leg 63 is placed and fixed on the front surface of the bottom plate 9. The FPC 8 described later is located in the space between the bracket 6 and the bottom plate 9.

[0047] The bracket 6 is a quadrilateral frame body having two pairs of wall portions 61 facing each other in the X direction and the Y direction. 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, there is a recessed portion recessed inward. The FPC 5 is fixed on 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, the second coil 4 and the Hall element 49 described later.

[0048] In the four wall portions 61, there are long holes 62. In the long holes 62 of the four wall portions 61, two of the eight second coils 4 are accommodated along the length direction of each side of the quadrilateral. The second coil 4 fixed on the wall portions 61 facing each other in the X direction is wound around the X axis as a winding axis, and the second coil 4 fixed on the wall portions 61 facing each other in the Y direction is wound around the Y axis as a winding axis.

[0049] In the hollow cores of the second coil 4 on the Y side of the coil 4 fixed on the +X side wall portion 61, the second coil 4 on the +Y side of the second coil 4 fixed on the -X side wall portion 61, and the second coil 4 on the X side of the second coil 4 fixed on the -Y side wall portion 61, one Hall element 49 is disposed respectively. The second coil 4 and the Hall element 49 are fixed on the inner surface of the FPC 5. The three Hall elements 49 are used to detect the tilt amount of the AF module 3.

[0050] Preferably, for example, the eight second coils 4 are electrically connected in series respectively, and two second coils 4 located on opposite sides across the optical axis are set as a group of four second coils. When currents flow through the two second coils 4, electromagnetic forces in opposite directions and of the same magnitude are generated in the front-rear direction. 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 the two second coils 4 as the axial direction.

[0051] As Figure 4 shown, the gimbal spring 2 has an inner frame portion 21, a middle frame portion 22, an outer frame portion 23, a first connecting portion 24 connecting the central portion in the X direction of the inner frame portion 21 and the middle frame portion 22, and a second connecting portion 25 connecting the central portion in the Y direction of the middle frame portion 22 and the outer frame portion 23.

[0052] 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 placed and fixed to the front end of the wall portion 61 of the bracket 6. Through the gimbal spring 2, the AF module 3 is supported in a floating state in the space inside the wall portion 61 of the bracket 6. Inside the AF module 3, the magnet 35 facing the first coil 34 faces the second coil 4 on the bracket 6 with the side plate 312 of the AF module 3 interposed therebetween. More specifically, the front magnet piece of the magnet 35 faces the front portion of the second coil 4, and the rear magnet piece faces the rear portion of the second coil 4.

[0053] The magnet 35 drives the carrier 33 and the lens body 130 inside the AF module 3 in the optical axis direction through the electromagnetic force between it and the first coil 34, and drives the AF module 3 to rotate about the axes in the X and Y directions through the electromagnetic force between it and the second coil 4.

[0054] The above are the structural details of the first embodiment. The optical component driving device 100 of the first embodiment includes, in the XYZ orthogonal coordinate system: an AF module 3, which is an optical component and has a lens body 130 and a lens driving device for driving the lens body 130, and an image sensor 190 that is installed in the lens driving device and converts the light passing through the incident lens body 130 into an image signal; and a fixing portion that surrounds the AF module 3 and supports it so that it can tilt and move freely. The lens driving device has: a first coil 34 that is provided on the carrier 33 that holds the lens body 130; and a magnet 35 that is installed on the intermediate fixing portion that surrounds the carrier 33 and faces the first coil 34. The fixing portion has eight second coils 4 that face the magnet 35. Thus, through the electromagnetic force between the magnet 35 and the first coil 34, the lens body 130 is moved in the Z direction, and through the electromagnetic force between the magnet 35 and the second coil 4, the AF module 3 is tilted and moved around the axes in the X and Y directions. Thereby, an optical component driving device 100 capable of performing fine jitter correction control can be provided.

[0055] <Second Embodiment>

[0056] In the above first embodiment, the first coil 34 is wound around the side surface of the carrier 33 with the Z axis as the winding axis. In contrast, in the second embodiment, the first coil 34 is wound with the X axis and the Y axis as the winding axes.

[0057] As Figure 8As shown, in the second embodiment, one first coil 34 is fixed to each of the two side surfaces facing each other in the X direction and the two side surfaces facing each other in the Y direction of the carrier 33. The two first coils 34 on the side surfaces facing each other in the X direction are wound around the X axis as the winding axis. The two first coils 34 on the side surfaces facing each other in the Y direction are wound around the Y axis as the winding axis. The four first coils 34 face the magnets 35 respectively. More specifically, the front part of the first coil 34 faces the front magnet piece, and the rear part faces the rear magnet piece. According to the second embodiment, the same effects as those of the first embodiment can also be obtained.

[0058] <Third Embodiment>

[0059] In the above second embodiment, the number of the first coils 34 is four. In contrast, in the third embodiment, the number of the first coils 34 is two.

[0060] As Figure 9 shown, in the third embodiment, one first coil 34 is fixed to each of the two side surfaces facing each other in the X direction of the carrier 33, and no first coil 34 is fixed to the side surfaces facing each other in the Y direction. In this case, the magnets 35 on the +Y side and the -Y side do not face the first coil 34 and only face the second coil 4. According to the third embodiment, the same effects as those of the first embodiment and the second embodiment can be obtained.

[0061] In addition, in the first to third embodiments above, the inner cover 31 can also be removed. For example, it can also be configured to install the magnet 35 and the front spring 32 on the base 37.

[0062] In addition, in the first to third embodiments above, in order to generate an electromagnetic force with the same orientation in the front-rear direction when a current flows, two adjacent second coils 4 can be electrically connected to form four coil groups, and in order to generate an electromagnetic force with the opposite orientation in the front-rear direction when a current flows, two coil groups located on opposite sides across the optical axis are electrically connected. In this case, the two second coils 4 to be electrically connected can be two second coils 4 arranged on the same wall portion 61, or two second coils 4 arranged on two adjacent wall portions 61. The second coil 4 can also flow through a current independently without being electrically connected to other second coils 4. The second coil 4 is not limited to eight, and can also be four, etc. In this case, the control is simple. Two holes can also be provided in the four wall portions 61 of the bracket 6, and one second coil 4 is received in each of the two holes.

[0063]

Symbol Explanation

[0064] 1 Outer cover; 2 Universal spring; 3 AF module; 4 Second coil; 5 8FPC; 6 Bracket; 7 Frame; 9 Base plate; 10, 310, 370 Through hole; 11, 311 Front plate; 12, 312 Side plate; 21 Inner frame part; 22 Middle frame part; 23 Outer frame part; 24 First connecting part; 25 Second connecting part; 31 Inner cover; 32 Front side spring; 33 Carrier; 34 First coil; 35 Magnet; 36 Rear side spring; 37 Base; 49 Hall element; 61 Wall part; 62 Long hole; 63 Leg part; 100, 100A, 100B Optical component driving device; 101 Camera device; 102 Smart phone; 130 Lens body; 190 Image sensor.

Claims

1. An optical component driving device, characterized in that, In an XYZ orthogonal coordinate system, it includes: An AF module as an optical component, which has 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; A cover and a bottom plate as an outer frame combination; A bracket fixed to the front surface of the bottom plate; Eight second coils, and every two of the eight second coils are respectively fixed to four wall portions of the bracket; And A gimbal spring, through which the AF module is supported in a floating state in the space inside the wall portion of the bracket, The lens driving device has: An intermediate fixing portion, which has an inner cover as an inner frame combination and a quadrilateral base; and four magnets fixed to the inner surfaces of four side plates of the inner cover made of a non-magnetic material; A carrier, which has a through hole as a holding portion for holding the lens body at its center, and a first coil is provided on the side surface of the carrier; and A front spring and a rear spring, through which the carrier is suspended inside the inner frame, The magnets face the first coil with a gap therebetween, and the side plates of the inner cover sandwiching the AF module face the second coils, The lens body is moved along the Z direction by the electromagnetic force between the magnets and the first coil, and the AF module is tilted and moved around the axes in the X and Y directions by the electromagnetic force between the magnets and the second coils.

2. The optical component driving device according to claim 1, wherein Regarding the second coils, in order to generate electromagnetic forces with the same orientation in the front-rear direction when current flows, two adjacent second coils are electrically connected to form four coil groups, and in order to generate electromagnetic forces with opposite orientations in the front-rear direction when current flows, the two coil groups located on opposite sides across the optical axis of the lens body are electrically connected.

3. The optical component driving device according to claim 1, wherein Among the eight second coils, four are wound around the axis in the X direction, and the remaining four are wound around the axis in the Y direction, The fixing portion has a bracket, and the bracket has wall portions provided with holes for respectively accommodating 2 of the second coils on each side of the quadrilateral.

4. The optical component driving device according to claim 1, wherein On the outer surfaces of the four wall portions, there are FPCs bent along the outer surfaces, The second coils are fixed to the inner surfaces of the FPCs.

5. The optical component driving device according to claim 1, wherein The first coil is wound around the axis in the Z direction.

6. The optical component driving device according to claim 1, wherein The first coil is wound around the axes in the X and Y directions.

7. A camera device, characterized in that, It includes the optical component driving device according to any one of claims 1 to 6.

8. An electronic device, characterized in that, It includes the camera device according to claim 7.

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