Optical component driving device, camera device, and electronic device

Abstract

The present invention provides an optical component driving device that has a small amount of movement of the front end of an optical component and can be miniaturized. The optical component driving device (100) comprises: a camera module (101) as an optical component having a lens body (102); a base plate (9); a slider (106) having a convex spherical surface and arranged on the rear surface of the camera module (101); and a receiving portion (108) arranged on the front surface of the base plate (9) and receiving the slider (106) at least at three points. Since the receiving portion (108) receives the slider (106) having a convex spherical surface at at least three points, the camera module (101) and the slider (106) can tilt and move together with the slider (106) with the center of the convex spherical surface of the slider (106) as the center.

Description

Technical Field

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

[0002] In camera devices used in electronic devices such as smartphones, some optical components having a lens body and an image sensor are tilted around the X-axis or Y-axis to perform shake correction. As a document that discloses technology related to such a camera device, there is Patent Document 1. The optical device for shooting disclosed in Document 1 is provided with a pivot portion at the center of a base, and the center of the bottom surface of the optical component is supported by the pivot portion. A magnet for shake correction is provided on the outer surface of the optical component opposite to the X and Y directions, and a coil for shake correction is provided on the inner surface of a fixed cover. In this device, when a current flows through the coil, the optical component tilts around the point supported by the pivot portion.

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2009-294393A Summary of the invention

[0006] [Problems to be solved by the invention]

[0007] However, in the case of the technology of Patent Document 1, the optical component tilts around the rear end portion supported by the pivot portion, so there is a problem that the amount of movement of the front end portion of the optical component in the XY directions is large, and the size of the device increases.

[0008] The present invention has been made in view of such a problem, and an object of the present invention is to provide an optical component driving device in which the amount of movement of the tip portion of an optical component is small and which can be miniaturized.

[0009]

Methods for solving problems

[0010] In order to solve the above-mentioned problems, a lens driving device as a preferred embodiment of the present invention is characterized in that, when adopting an XYZ orthogonal coordinate system having mutually orthogonal X-axis, Y-axis and Z-axis, it comprises: an optical component having a lens body and an image sensor, wherein the optical axis direction of the lens body is parallel to the Z direction when not in operation; a base plate; a slider, which is arranged on the surface of the optical component facing the -Z side and has a convex spherical surface bulging toward the -Z side; and a supporting portion, which is arranged on the surface of the base plate facing the +Z side and supports the slider at least at three points, and the slider is arranged at the center of the surface of the optical component facing the -Z side, and at this time, the slider is constructed so that in the Z direction, the center of the convex spherical surface of the slider becomes the center of the optical component including the slider.

[0011] In this aspect, the receiving portion may have a concave spherical surface, and the convex spherical surface may be slidably held on the concave spherical surface.

[0012] Alternatively, the central radii of the convex spherical surface and the concave spherical surface may be consistent.

[0013] Furthermore, the receiving portion may include three convex portions, and the convex spherical surface may be slidably held on the three convex portions.

[0014] Furthermore, when viewed from the direction of the optical axis of the lens body, the three convex portions may be located at positions where vertices of a triangle including the optical axis are located.

[0015] Furthermore, a cover may be provided that covers the optical component and is combined with the base plate, a coil may be provided on one of an outer surface of the optical component and an inner surface of the cover, and a magnet may be provided on the other surface so as to face the coil.

[0016] Furthermore, in the optical axis direction of the lens body, the center position of the convex spherical surface may be the same as the positions of the coil and the magnet.

[0017] A camera device according to another preferred embodiment of the present invention is characterized by comprising the above-mentioned optical component driving device.

[0018] An electronic device according to another preferred embodiment of the present invention is characterized by including the above-mentioned camera device.

[0019] [Effects of the invention]

[0020] The optical component driving device of the present invention comprises: an optical component having a lens body; a base plate; a slider, which is arranged on the rear surface of the optical component and has a convex spherical surface; and a receiving portion, which is arranged on the front surface of the base plate and receives the slider at least at three points. Since the receiving portion receives the slider having a convex spherical surface at least at three points, the optical component and the slider can tilt and move together with the center of the convex spherical surface of the slider as the center. As a result, the center of the tilting movement can be set inside the optical component, and the movement amount of the front end of the optical component can be reduced. Therefore, it is possible to provide a miniaturized optical component driving device. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a front view of a smartphone 201 equipped with a camera device 200 including the optical component driving device 100 as one embodiment of the present invention.

[0022] Figure 2 yes Figure 1 A perspective view of an optical component driving device 100 is shown in FIG.

[0023] Figure 3 It is decomposed Figure 2 A perspective view of an optical component driving device 100 is shown in FIG.

[0024] Figure 4 is from Figure 2 A perspective view in which the cover 1, the camera module 101, the second FPC 8, and the bottom plate 9 are removed.

[0025] Figure 5 yes Figure 2 A-A' line cross-section diagram.

[0026] Figure 6 Yes means Figure 2 Figure 2FPC8.

[0027] Figure 7 It is unfolded Figure 6 Figure 2FPC8. DETAILED DESCRIPTION

[0028] like Figure 1 As shown, a camera device 200 including an optical component driving device 100 according to an embodiment of the present invention is housed in a housing of a smartphone 201 .

[0029] The camera device 200 includes a camera module 101 as an optical component and an optical component driving device 104 that holds the camera module 101. The camera module 101 includes a lens body 102, an image sensor 103, a lens driving device 104, and a rectangular parallelepiped frame 105 that covers them. The image sensor 103 converts light incident through the lens body 102 into an image signal and outputs it. The lens driving device 104 drives the lens body 102 in a direction parallel to the optical axis of the lens body 102, but this is not necessarily the case.

[0030] Here, an XYZ orthogonal coordinate system is used, in which the X-axis, Y-axis, and Z-axis are orthogonal to each other. The optical axis direction of the lens body 102 is parallel to the Z direction when not in operation. In addition, the side from which the subject is observed from the lens body 102 is the +Z side, sometimes referred to as the front side, and the opposite side (the side of the image sensor 103) is the -Z side, sometimes referred to as the rear side. In addition, the side facing the front side is referred to as the front surface, and the side facing the rear side is referred to as the rear surface. In addition, among the surfaces parallel to the Z-axis, the side facing the direction close to the optical axis is referred to as the inner surface, and the side facing the direction away from the optical axis is referred to as the outer surface.

[0031] like Figure 3 As shown, the optical component driving device 100 includes a cover 1 , a first FPC 2 , two Hall elements 3 , four coils 4 , four magnets 5 , a frame 6 , four leaf springs 7 , a slider 106 , a second FPC 8 , and a base plate 9 .

[0032] The cover 1 has a quadrilateral front plate 17 and four side plates 18 extending from the four sides of the front plate 17 along the -Z side. A quadrilateral through hole 19 is provided in the front plate 17 of the cover 1. The cover 1 and the quadrilateral bottom plate 9 are combined as an outer frame. In the outer frame, the first FPC 2, the Hall element 3, the coil 4, the magnet 5, the frame 6, the leaf spring 7, the camera module 101, the slider 106 and the second FPC 8 are held. The camera module 101 is exposed to the +Z side from the through hole 19 of the cover 1.

[0033] The frame 6 is used to fix the camera module 101 inside it, and is a frame-shaped body composed of four walls extending in the Z direction. When the camera module 101 is installed, the four sides of its frame 105 are surrounded by the frame 6 and fixed to the frame 6 by an adhesive. On the outer surface of the frame 6, a magnet 5 is also fixed as a driving part for driving the camera module 101. The magnet 5 is composed of two rectangular parallelepiped magnet pieces arranged side by side in the Z direction. The two magnet pieces are magnetized so that the magnetic poles in the direction of the plate surface are opposite poles. Each magnet 5 can also be configured as a magnet piece in a manner to form a magnetic pole configuration as described above. In addition, each magnet 5 can also be fixed directly on the camera module 101 instead of on the frame 6, and can also serve as a magnet for driving the lens in the camera module 101.

[0034] The first FPC 2 is provided inside the four side plates 18 of the cover 1. The first FPC 2 includes a first plate portion 21a, a second plate portion 21b, a third plate portion 21c, and a fourth plate portion 21d fixed to the side plates 18 at the -X side, +Y side, +X side, and -Y side, respectively.

[0035] The first plate portion 21a and the second plate portion 21b, the second plate portion 21b and the third plate portion 21c, and the third plate portion 21c and the fourth plate portion 21d intersect at right angles and are connected to each other at the inner sides of the corners on the -X+Y side, the corners on the +X+Y side, and the +XY side of the cover 1. The end of the -X side of the fourth plate portion 21d changes direction and extends to the rear side before reaching the corner on the -XY side of the cover 1.

[0036] The front end extending to the rear side of the fourth plate portion 21d is bent toward the -Y side at the rear edge of the side plate 18 on the -Y side of the cover 1, and protrudes toward the -Y side from the gap between the cover 1 and the bottom plate 9 formed by the cutout of the side plate 18. The front end portion of the fourth plate portion 21d protruding toward the -Y side is electrically connected to an external substrate.

[0037] On each inner surface of the first plate portion 21a, the second plate portion 21b, the third plate portion 21c, and the fourth plate portion 21d of the first FPC 2, a coil 4 as a driving portion facing the magnet 5 is fixed. The coil 4 fixed on the first plate portion 21a and the third plate portion 21c is wound around the X axis, and the coil 4 fixed on the second plate portion 21b and the fourth plate portion 21d is wound around the Y axis. The coil 4 and the magnet 5 together constitute a driving portion that causes the camera module 101 to tilt around the X and Y directions.

[0038] A Hall element 3 is disposed in each of the hollow core portion of the coil 4 on the +X side and the hollow core portion of the coil 4 on the -Y side. The Hall element 3 is fixed to the inner surface of the third plate portion 21c and the fourth plate portion 21d. The Hall element 3 detects the magnetic field from the magnet 5 facing the Hall element 3 and outputs a signal indicating the detection result.

[0039] The leaf spring 7 has an outer portion mounted on the cover 1, an inner portion mounted on the frame 6, and an arm portion elastically connecting the outer portion and the inner portion. The outer portion is fixed to the inner surface of the portion that is recessed toward the rear side at the four corners of the front plate 17 of the cover 1. The inner portion is fixed to the portion that is recessed toward the rear side at the front side of the four corners of the frame 6. The leaf spring 7 presses the frame 6 toward the rear side.

[0040] The slider 106 is fixed at the center of the rear surface of the camera module 101. The rear surface of the slider 106 bulges toward the rear side as a convex spherical surface. In the XY direction, the center O of the convex spherical surface of the slider 106 coincides with the optical axis and the center of the image sensor 103. In the Z direction, the position of the center O of the convex spherical surface is approximately the center of the camera module 101 including the slider 106, and is the same as the positions of the coil 4 and the magnet 5. By arranging the slider 106 at the center of the rear surface of the frame 105 of the camera module 101, the device can be made thinner. The slider 106 can also form the rear surface of the camera module 101 itself into a convex spherical shape, and form the frame 6 in a manner of holding the bottom surface, and form the bottom surface into a convex spherical shape.

[0041] A bearing portion 108 is provided at the center of the front surface of the base plate 9. The slider 106 and the bearing portion 108 constitute a support mechanism, which is arranged between the center of the camera module 101 and the base plate 9, and supports the camera module 101 so that it can be tilted and moved freely. The front surface of the bearing portion 108 is a concave spherical surface corresponding to the convex spherical surface of the slider 106. That is, the center O and the radius of the convex spherical surface and the concave spherical surface are consistent, and the surfaces are in contact. The bearing portion 108 is the most integral, and is formed to protrude from the front surface of the base plate 9 to the front side, and the rearmost part of the concave spherical surface is not located at a position further back than the base plate 9 outside the bearing portion 108. The bearing portion 108 formed as a separate body can also be fixed to the front surface of the base plate 9.

[0042] By making the center O of the slider 106 be located at the approximate center of the camera module 101 including the slider 106, when the camera module 101 tilts, the rear end and the front end of the camera module 101 move in the XY direction in a substantially equal amount. Compared with the case where the center of the tilting movement is located at the rear end of the pivot, the amount of movement is approximately halved. In addition, when the center is located at the same height as the center O, the amount of movement in the XY direction is approximately 0. The positions of the magnet 5 and the coil 6 are approximately the same as the position of the center O, so the distance between the magnet 5 and the coil 6 hardly changes even when a tilting movement occurs, so a stable driving force can be obtained. In addition, at this time, the driving force generated by the magnet 5 and the coil 6 is almost in the Z direction, and the movement of the magnet 5 during the tilting movement is also almost in the Z direction. The direction of the driving force is consistent with the direction of the movement, so the driving efficiency is also excellent. In this way, when a driving part such as the magnet 5 and the coil 6 is configured in a manner that generates a driving force in the tangent direction of a circle centered on the center O, the driving efficiency is excellent.

[0043] The second FPC 8 is arranged between the front surface of the base plate 9 and the rear surface of the camera module 101. Figure 6 as well as Figure 7As shown, the second FPC 8 has a main body 81 and two connecting parts 82. The main body 81 is square-shaped. In the center of the main body 81, a through hole 80 corresponding to the slider 106 is provided, and the slider 106 is arranged in the through hole 80. The main body 81 is mounted on the rear surface of the camera module 101 and is electrically connected to the image sensor 103 and the lens driving device 104 in the camera module 101. The two connecting parts 82 extend in a point-symmetrical manner from two edge parts that are point-symmetrical on the +X side and the -X side sandwiching the center of the main body 81, bend several times, and are accommodated in the space between the rear surface of the camera module 101 and the front surface of the bottom plate 9. In a manner that the two connecting parts 82 do not overlap, the connecting part 82 extending from the edge part on the +X side uses the area on the +Y side from half, passes through the slider 106 and the +Y side of the receiving part 108, bends several times, and then protrudes to the outside from the gap between the cover 1 and the bottom plate 9 formed by the cutout of the side plate 18 on the -X side. The connecting portion 82 extending from the edge portion on the -X side uses the area on the -Y side from the halfway point, passes through the slider 106 and the -Y side of the supporting portion 108, is bent multiple times, and then protrudes to the outside from the gap between the cover 1 and the bottom plate 9 formed by the cutout of the side plate 18 on the +X side.

[0044] The two front end portions of the connection portion 82 protruding toward the +X side and the -X side are electrically connected to the external substrate, respectively. The two connection portions 82 are fixed to the cover 1 and the bottom plate 9 at the positions of the cutouts.

[0045] like Figure 7 As shown, when unfolded, the two connecting parts 82 of the second FPC 8 have a ridgeline 821 at the base end connected to the main body 81, a ridgeline 822 at a position separated from the main body 81 relative to the ridgeline 821, and a ridgeline 823 at a position separated from the main body 81 relative to the ridgeline 822. The two connecting parts 82 are folded back on these ridgelines 821, 822, and 823 to form a folded shape. The ridgeline 821, ridgeline 823 of one folded connecting part 82 and the ridgeline 822 of the other connecting part 82 are approximately the same in the X direction, and the ridgeline 821, ridgeline 823 of the other connecting part 82 and the ridgeline 822 of one connecting part 82 are approximately the same in the X direction.

[0046] The portions of the two connecting parts 82 divided by the ridges 821, 822, and 823 have portions bent outward as bent portions 881, 882, and 883. The inner edges of the bent portions 881, 882, and 883 of the two connecting parts 82 are almost overlapped when viewed from the Z direction, and surround the slider 106 and the receiving part 108 from both the +Y side and the -Y side.

[0047] like Figure 6As shown, the outer edges of the curved portions 881, 882 and 883 of the two connecting portions 82 are almost overlapped when viewed from the Z direction. In the direction orthogonal to the direction in which the connecting portion 82 extends, i.e., the Y direction, although they are exposed to the outside of the edge of the main body 81, they are not exposed beyond the magnet 5. The magnet 5 is also located to the outside of the curved portions 881, 882 and 883. Figure 5 As shown, the rear edges of the four magnets 5 on the outer surface of the frame 6 are located in front of the bent portions 881, 882, and 883. Therefore, even if the camera module 101 tilts, the magnets 5 and the bent portions 881, 882, and 883 do not interfere with each other.

[0048] The slider 106 and the receiving portion 108 are located between the inner edges of the curved portions 881, 882, and 883 of the two connecting portions 82. The slider 106 is mounted on the rear surface of the camera module 101, and its convex spherical surface is exposed toward the rear side from the through hole 80 of the main body 81. The convex spherical surface of the slider 106 is slidably held on the concave spherical surface of the receiving portion 108.

[0049] A control unit (not shown) is provided outside the optical component driving device 100. The control unit performs detection control and drive control. In the detection control, the control unit derives the position of the magnet 5 opposite to the Hall element 3 in the Z direction based on the output signals of the two Hall elements 3, and determines the slope of the optical axis of the camera module 101, that is, the lens body 102, relative to the Z axis. In the drive control, the control unit supplies current to the coil 4 to slide the convex spherical surface of the slider 106 on the concave spherical surface of the receiving part 108, so that the camera module 101 tilts around the X-axis and the Y-axis. This is performed while comparing the required slope of the optical axis with the actual slope of the optical axis.

[0050] The above is the details of the configuration of this embodiment. The optical component driving device 100 of this embodiment includes: a camera module 101 as an optical component having a lens body 102; a base plate 9; a slider 106 provided on the rear surface of the camera module 101 and having a convex spherical surface; and a slider 106 provided on a receiving portion 108 and the front surface of the base plate 9 and receiving the slider 106 at least at three points. By providing the receiving portion 108 receiving the slider 106 having a convex spherical surface at least at three points, the camera module 101 and the slider 106 can tilt and move with the center of the convex spherical surface of the slider 106 as the center. As a result, the center of the tilting movement can be set inside the camera module 101, and the amount of movement of the front end of the camera module 101 can be reduced. Therefore, it is possible to provide an optical component driving device 100 that can be miniaturized. In addition, by arranging the slider 106 near the center of the image sensor 103, the slider 106 can slide the camera module 101 and dissipate heat from the image sensor 103 at the same time.

[0051] In the above embodiment, the receiving part 108 may be provided with three convex parts at the positions of the triangle vertices including the optical axis of the lens body 102, and the convex spherical surface of the slider 106 may be slidably supported on the three convex parts of the receiving part 108. By such a three-point support structure, the friction between the convex spherical surface and the receiving part 108 can be reduced. In addition, at least three balls may be arranged as the rotational freedom of the receiving part 108, and the convex spherical surface of the slider 106 may be supported by these balls.

[0052] In addition, a lubricant may be sandwiched between the slider 106 and the receiving portion 108. In addition, a magnetic body may be arranged on the front surface of the base plate 9 to exert an attractive force on the magnet 5. In this case, the leaf spring 7 may not be arranged. In addition, a coil wound around the Z direction may be arranged between the magnet 5 and the magnetic body. Thus, the camera module can be rotated around the Z direction.

[0053]

Explanation of symbols

[0054] 1 cover; 2 first FPC; 3 Hall element; 4 coil; 5 magnet; 6 frame; 7 leaf spring; 8 second FPC; 9 bottom plate; 17 front plate; 18 side plate; 19 through hole; 21a first plate portion; 21b second plate portion; 21c third plate portion; 21d fourth plate portion; 80 through hole; 81 main body portion; 82 connecting portion; 100 optical component driving device; 101 camera module; 102 lens body; 103 image sensor; 104 lens driving device; 105 frame; 106 slider; 108 supporting portion; 200 camera device; 201 smart phone; 821, 822, 823 edges; 881, 882, 883 bending portions.

Claims

1. An optical component driving device, characterized in that: When an XYZ orthogonal coordinate system having mutually orthogonal X-axis, Y-axis, and Z-axis is adopted, it has: An optical component having a lens body and an image sensor, wherein the optical axis direction of the lens body is parallel to the Z direction in a non-operating state; Base plate; A slider, which is arranged on the surface of the optical component facing the -Z side and has a convex spherical surface bulging toward the -Z side; as well as A bearing portion is provided on the surface of the bottom plate facing the +Z side and bears the slider at least at three points. The slider is disposed at the center of the surface of the optical component facing the -Z side. In this case, the slider is configured such that in the Z direction, the center of the convex spherical surface of the slider becomes the center of the optical component including the slider.

2. The optical component driving device according to claim 1, characterized in that: The receiving portion has a concave spherical surface, The convex spherical surface is slidably held on the concave spherical surface.

3. The optical component driving device according to claim 2, characterized in that: The centers and radii of the convex spherical surface and the concave spherical surface are consistent.

4. The optical component driving device according to claim 1, characterized in that: The receiving portion has three convex portions, The convex spherical surface is slidably held on the three convex portions.

5. The optical component driving device according to claim 4, characterized in that: The three convex portions are located at vertices of a triangle including the optical axis when viewed from the direction of the optical axis of the lens body.

6. The optical component driving device according to claim 1, characterized in that: A cover is provided which covers the optical component and is combined with the base plate. A coil is provided on one of the outer surface of the optical component and the inner surface of the cover, and a magnet is provided on the other surface so as to face the coil.

7. The optical component driving device according to claim 6, characterized in that: In the optical axis direction of the lens body, the position of the center of the convex spherical surface is the same as the positions of the coil and the magnet.

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

9. An electronic device, characterized in that: A camera device according to claim 8.

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