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 with a small width in the optical axis direction. The OIS lens driving device (10) comprises: a fixed part, which comprises a plate-shaped base (6) having a through hole (67); a movable part, which comprises a spring plate (5) for placing the optical component; and an SMA driving part (4), which comprises an SMA cable (41) for driving the movable part. Thus, the spring plate (5) comprises a main body (51) of the spring plate (5) and two wrists (55) extending from the main body (51) of the spring plate (5) and fixed on the plate surface of the base (6), and the main body (51) of the spring plate (5) is located as a whole on the inner side of the through hole (67) when viewed from the normal direction of the plate surface.

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] Various solutions have been proposed for camera devices equipped with an OIS (Optical Image Stabilizer) function. Patent Document 1 is a document that discloses technology related to such a device. The camera device disclosed in Patent Document 1 uses two pairs of SMA (Shape Memory Alloy) cables to connect and integrate an OIS base as a fixed part and a guide as a movable part that supports a lens, wherein the two pairs of SMAs shrink along the X-axis direction and the Y-axis direction by generating heat based on an electric current. The camera device achieves shake correction by controlling the SMA cables.

[0003] [Patent Document 1] Chinese Patent No. 108174104

[0004] However, in the technology of Patent Document 1, the OIS base and the guide are stacked in the optical axis direction, that is, in the Z-axis direction, and thus there arises a problem that the width in the Z-axis direction becomes thicker. Summary of the invention

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide an optical component driving device, a camera device, and an electronic device in which the width in the optical axis direction is reduced.

[0006] In order to solve the above-mentioned problems, an optical component driving device as a preferred embodiment of the present invention is characterized in that it comprises: a fixed part, which has a plate-shaped base with a through hole; a movable part, which has a spring plate for mounting the optical component; and an SMA driving part, which has an SMA cable to drive the movable part, the spring plate having a spring plate body and two arms extending from the spring plate body and fixed on the plate surface of the base, the spring plate body, when observed from the normal direction of its plate surface, is located on the inner side of the through hole as a whole, and is not connected to the base because it is smaller than the through hole.

[0007] In an embodiment, the spring plate may include a first pin protruding outward from the spring plate body, and a movable end portion of the SMA driving portion may be provided on the first pin.

[0008] Furthermore, the first pin may be formed integrally with the spring plate.

[0009] In addition, the first pin or the movable end portion of the SMA driving portion slides relative to the base.

[0010] Alternatively, portions of the two arms that are fixed to the base may be exposed to the outside.

[0011] Furthermore, the fixed-side end of the SMA driving portion may be provided on a second pin provided on the base, and the second pin may be exposed to the outside.

[0012] Furthermore, the optical component may include an optical component body and a rim portion provided around the optical component body, and the rim portion may slide relative to a fixed-side end portion of the SMA driving portion.

[0013] Alternatively, the SMA cable of the SMA driving unit may be arranged at the same height as the spring plate in the normal direction of the plate surface of the spring plate.

[0014] Alternatively, the SMA cables of the SMA driving unit may be arranged on both sides of the spring plate in a normal direction of the plate surface of the spring plate.

[0015] Alternatively, the fixed portion may further include a housing, and the movable portion or the optical component on the movable portion may slide relative to a sliding portion provided at a rear surface of a front wall of the housing.

[0016] A camera device as another preferred embodiment of the present invention is characterized in that it comprises: the above-mentioned optical component driving device; a lens assembly as the optical component; an AF lens assembly that allows light from a subject to pass through; and an image sensor that receives light passing through the AF lens assembly, wherein the lens assembly is arranged between the subject and the AF lens assembly.

[0017] Alternatively, a light path refraction element may be disposed between the lens assembly and the AF lens assembly.

[0018] A camera device as another preferred embodiment of the present invention is characterized in that it comprises: the above-mentioned optical component driving device; a lens assembly as the optical component; an AF lens assembly that allows light from a subject to pass through; and an image sensor that receives light passing through the AF lens assembly, wherein the lens assembly is arranged between the AF lens assembly and the image sensor.

[0019] A camera device as another preferred embodiment of the present invention is characterized in that it comprises: the above-mentioned optical component driving device; an AF lens body that allows light from a subject to pass; and an image sensor as the optical component that receives light passing through the AF lens body.

[0020] An electronic device according to another aspect of the present invention includes the camera device described above.

[0021] The optical component driving device of the present invention comprises: a fixed part, which has a plate-shaped base with a through hole; a movable part, which has a spring plate for placing an optical component; and an SMA driving part, which has an SMA cable to drive the movable part. Thus, the spring plate has a spring plate body and two arm parts extending from the spring plate body and fixed on the plate surface of the base, and the spring plate body is located on the inner side of the through hole as a whole when viewed from the normal direction of the plate surface. As a result, the thickness of the optical component driving device is only the thickness of the base, the spring plate and the SMA driving part, and can be made thinner. Therefore, according to the present invention, an optical component driving device, a camera device and an electronic device with a small width in the optical axis direction can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 In the figure, (A) is a front view of a smartphone 70, and (B) is a side view of the smartphone 70. The smartphone 70 is an electronic device equipped with a camera device 1, and the camera device 1 includes an OIS lens driving device 10 which is an optical component driving device according to an embodiment of the present invention.

[0023] Figure 2 yes Figure 1 A stereoscopic view of the camera device 1 is shown in FIG.

[0024] Figure 3 yes Figure 2 1 is a perspective view of an OIS lens driving device 10 .

[0025] Figure 4 yes Figure 3 A-A' line cross-section diagram.

[0026] Figure 5 It is decomposition Figure 1 A perspective view of the OIS lens driving device 10.

[0027] Figure 6 From other perspectives Figure 1 1 is an exploded perspective view of the OIS lens driving device 10.

[0028] Figure 7 is from Figure 3 Figure with housing 2 removed.

[0029] Figure 8 is from Figure 7 A diagram in which the OIS lens assembly 3 is removed.

[0030] Fig. 9 Observed from the +Z side Figure 8 .

[0031] Description of Reference Numerals

[0032] 1. Camera device; 2. Housing; 3. OIS lens assembly; 4. SMA drive unit; 5. Spring plate; 6. Base; 8. AF lens assembly; 10. Lens drive device; 23. Front wall; 24. Side wall; 25, 26. Recess; 27, 57, 67. Through hole; 30. OIS lens body; 31. Edge; 41. SMA cable; 42. Fixed side end; 43. Movable side end; 51. Main body; 53. First pin; 55. Wrist; 56. Connecting piece; 62. Second pin; 70. Smart phone; 81. Prism; 83. Image sensor; 91. Prism device; 92. AF lens drive device; 520, 530. Cutout. DETAILED DESCRIPTION

[0033] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Figure 1 As shown, the camera device 1 is accommodated in the housing of the smartphone 70. The camera device 1 includes: an OIS lens assembly 3 and an AF lens assembly 8 as optical components; a prism 81 as an optical path refraction element; an image sensor 83 as a photoelectric conversion element; an OIS lens driving device 10 for driving the OIS lens assembly 3; a prism device 91 for accommodating the prism 81; and an AF lens driving device 92 for driving the AF lens assembly 8. OIS is an abbreviation for Optical Image Stabilization. AF is an abbreviation for Autofocus.

[0034] In the following, the optical axis direction of the OIS lens assembly 3 along the optical axis of the OIS lens body 30 is sometimes appropriately referred to as the Z direction, a direction orthogonal to the Z direction is appropriately referred to as the X direction, and a direction orthogonal to both the Z direction and the X direction is appropriately referred to as the Y direction. In addition, the +Z side of the optical axis of the OIS lens body 30, which is the side of the subject, is sometimes referred to as the front side, and the side opposite to the subject where the prism 81 is provided, which is the -Z side, is sometimes referred to as the rear side. In addition, the +Y side is sometimes referred to as the upper side, the -Y side is sometimes referred to as the lower side, the +X side is sometimes referred to as the left side, and the -X side is sometimes referred to as the right side.

[0035] like Figure 1 (A) Figure 1 (B) and Figure 2As shown, in the camera device 1, the prism device 91 is arranged on the rear side of the OIS lens driving device 10, and the AF lens driving device 92 is arranged on the lower side of the prism device 91. The OIS lens driving device 10 supports the OIS lens assembly 3. In the prism device 91, a prism 81 is arranged, and its incident surface is opposite to the OIS lens assembly 3, and its exit surface is opposite to the AF lens assembly 8. In the AF lens driving device 92, the AF lens assembly 8 is arranged so that the direction along the optical axis of its AF lens body becomes the Y direction. On the lower side of the AF lens driving device 92, an image sensor 83 is arranged. The light from the subject passes through the OIS lens assembly 3 and is reflected toward the lower side by the prism 81. The light reflected by the prism 81 passes through the AF lens assembly 8 and is gathered to the image sensor 83. The image sensor 83 performs photoelectric conversion on the light and outputs it as an image signal. The camera device 1 is required to have a smaller dimension in the Z direction in order to reduce the dimension in the Z direction which is the thickness direction of the smartphone 70 . Therefore, the dimension in the Z direction of the OIS lens driving device 10 , that is, the thickness thereof, is required to be reduced.

[0036] like Figure 3 to Figure 6 As shown, the OIS lens driving device 10 includes a housing 2, an SMA driving unit 4, a spring plate 5, and a base 6. The following describes the details of the components. The housing 2 and the base 6 form a storage space to store the SMA driving unit 4, the spring plate 5, and the OIS lens assembly 3.

[0037] The housing 2 has a square front wall 23 and a side wall 24 that slightly extends to the rear side from the periphery of the front wall 23, forming a box-like body, and a through hole 27 is provided at the center of the front wall 23. The through hole 27 has a shape obtained by chamfering the four corners of the square. A plurality of recesses 25 and 26 that are recessed toward the front side are provided at the rear end of the side wall 24. The OIS lens assembly 3 is its main body, and has an OIS lens body 30 as an optical component body and a rim 31 provided around it. The rim 31 is a square plate with a perfect circular hole in the center, and the OIS lens body 30 is fixed to the inner periphery of the hole.

[0038] The SMA driving unit 4 includes an SMA cable 41 extending in one direction, and fixed-side ends 42 and movable-side ends 43 at both ends thereof. One end and the other end of the SMA cable 41 are firmly fixed to the fixed-side end 42 and the movable-side end 43, respectively. The fixed-side end 42 and the movable-side end 43 are formed of a conductive material and function as an electrical connection portion when the SMA cable 41 is energized.

[0039] The spring plate 5 has a main body 51 having a substantially quadrilateral shape and two arm portions 55 extending outward from two parallel end sides of the main body 51. A through hole 57 is provided at the center of the main body 51. The four corners of the main body 51 are cut to form cutout portions 520 and 530 at the diagonal portions.

[0040] The arm portion 55 protrudes from the base end of the body portion 51 at a position close to the cutout portion 530 on the X-direction end edge, extends along the X-direction end edge to the cutout portion 520, bends around the outside of the cutout portion 520 to one side of the Y-direction end edge, and extends in a direction away from the end edge to the outside. A connecting piece 56 is provided at the front end of the arm portion 55.

[0041] The cutout portion 530 is provided with a first pin 53 so as to protrude outward in a diagonal direction from the main body portion 51 . The first pin 53 has a pentagonal shape and is formed integrally with the main body portion 51 of the spring plate 5 .

[0042] The base 6 is in the shape of a rectangular plate. A through hole 67 is provided at the center of the base 6. The through hole 67 has a shape obtained by chamfering the four corners of a square. Two second pins 62 are provided at the upper right corner and the lower left corner of the front of the base 6, respectively. The second pin 62 is in the shape of a rectangular plate, and one end face thereof is substantially flush with the end face of the outer shape of the base 6.

[0043] Among the parts described above, the housing 2 and the base 6 form a fixed part, and the spring plate 5 and the OIS lens assembly 3 form a movable part that moves relative to the fixed part. The fixed part and the movable part are connected via four SMA driving parts 4.

[0044] The rear end of the side wall 24 of the housing 2 is joined to the peripheral edge of the front surface of the base 6. The spring plate 5 is arranged on the front surface of the base 6 in a narrow space surrounded by the housing 2 and the base 6. Fig. 9 As shown in FIG. 1 , the main body 51 of the spring plate 5 is located as a whole inside the through hole 67 of the base 6 when viewed from the normal direction of the plate surface. The two first pins 53 of the spring plate 5 extend outward from the chamfered portion of the through hole 67 of the base 6, and the extended portion overlaps with the base 6, but is not in contact with the base 6 in this embodiment. The edge portion 31 of the OIS lens assembly 3 is supported on the main body 51.

[0045] The arm 55 of the spring plate 5 extends outward from the through hole 67 of the base 6, and the connecting piece 56 at the front end of the arm 55 is connected to the front face of the base 6. The outer end face of the connecting piece 56 is fixed to be roughly flush with the end face of the outer shape of the base 6, and is exposed to the outside through the recess 25 of the housing 2. In addition, the outer end face of the second pin 62 is also exposed to the outside through the recess 26 of the housing 2. The elastic force of the two arm parts 55 of the spring plate 5 is balanced at the center position of the main body 51 in the through hole 57. This position is called the initial position. The arm part 55 extends roughly in the X direction and the Y direction, so the main body 51 can move in the XY plane direction. In addition, because it is smaller than the through hole 67, it does not contact the base 6 and can move with a smaller driving force.

[0046] The four SMA drive parts 4 are arranged on the front side of the base 6 along the respective end sides of the base 6. The fixed side end 42 of the SMA drive part 4 is provided on the second pin 62. The movable side end 43 of the SMA drive part 4 is provided on the first pin 53. Figure 4 As shown, the SMA cable 41 of the SMA driving portion 4 is located forward of the main body portion 51 and the arm portion 55 of the spring plate 5 in the normal direction of the plate surface of the spring plate 5 .

[0047] The four second pins 62 and the two connecting pieces 56 are connected to an external power source. Thus, a current path is formed: external power source → second pin 62 → fixed side end 42 → SMA cable 41 → movable side end 43 → first pin 53 → main body 51 → wrist 55 → connecting piece 56 → external power source, and current is supplied to the SMA cable 41. The four SMA driving parts 4 generate heat by being energized respectively, so that the SMA cable 41 contracts to drive the movable part. In the movable part, the main body of the spring plate 5 on which the OIS lens assembly 3 is mounted moves along the in-plane direction of XY.

[0048] The above is the details of the structure of this embodiment. The OIS lens driving device 10 as the optical component driving device of this embodiment includes: a fixed part, which includes a plate-shaped base 6 with a through hole 67; a movable part, which includes a spring plate 5 for placing an optical component; and an SMA driving part 4, which includes an SMA cable 41 to drive the movable part. Therefore, the spring plate 5 includes a main body 51 of the spring plate 5, and two arm parts 55 extending from the main body 51 of the spring plate 5 and fixed on the plate surface of the base 6. The main body 51 of the spring plate 5 is located on the inner side of the through hole 67 as a whole when viewed from the normal direction of its plate surface. As a result, the thickness of the OIS lens driving device 10 in the optical axis direction excluding the housing 2 is the thickness of the base 6, the spring plate 5 and the SMA driving part 4, and can be thinned. Therefore, according to this embodiment, an optical component driving device, a camera device and an electronic device with a small width in the optical axis direction can be provided.

[0049] In addition, in the above-mentioned embodiment, the SMA cables 41 of the four SMA driving parts 4 may be arranged at the same height as the spring plate 5 in the normal direction of the plate surface of the spring plate 5. For example, if the SMA cables 41 of the SMA driving parts 4 are laid between the main body 51 and the arm 55 on the side where the connecting piece 56 is present, the arm 55 and the SMA cables 41 do not interfere with each other, and the SMA cables 41 can be arranged at the same height as the spring plate 5. With such a configuration, the width of the optical axis direction of the optical component driving device can be further reduced. In addition, the floating of the spring plate 5 can be suppressed.

[0050] In addition, in the above embodiment, the number of SMA cables 41 of each of the four SMA driving units 4 may be set to two, and the two SMA cables 41 may be provided on both sides of the front and rear sides of the spring plate 5 in the normal direction of the plate surface of the spring plate 5. The SMA cables 41 cancel out the force pulling the spring plate 5 toward the front side and the force pulling the spring plate 5 toward the rear side. Therefore, the floating of the spring plate 5 can be suppressed.

[0051] In the above embodiment, the movable portion or the OIS lens assembly 3 on the movable portion may slide relative to the sliding portion provided on the rear surface of the front wall 23 of the housing 2. Alternatively, the edge portion 31 may slide relative to the fixed side end portion 42 of the SMA driving portion 4 or other fixed portions. Alternatively, the first pin 53 or the movable side end portion 43 of the SMA driving portion 4 may slide relative to the base 6.

[0052] In the above embodiment, the OIS lens assembly 3 is disposed between the subject and the AF lens assembly 8. In this embodiment, a prism 81 is further disposed between the OIS lens assembly 3 and the AF lens assembly 8. The OIS lens assembly 3 may be disposed between the AF lens assembly 8 and the image sensor 83.

[0053] In the above embodiment, the OIS lens body 30 is used as an optical component and the optical component driving device drives the OIS lens assembly 3, but the image sensor 83 may be used as an optical component and the optical component driving device drives the image sensor 83. That is, the OIS lens assembly 3 may be eliminated and the AF lens assembly 8 and the AF lens driving device 92 for focus adjustment, the image sensor 83 for shake correction, and the optical component driving device may be assembled.

Claims

1. An optical component driving device, characterized in that: have: a fixing portion including a plate-shaped base having a through hole; a movable portion having a spring plate on which the optical component is placed; and The SMA driving part has an SMA cable and drives the movable part. The spring plate comprises a spring plate body and two wrists extending from the spring plate body and fixed on the plate surface of the base. The spring plate body is wholly located inside the through hole when viewed from the normal direction of the plate surface, and the spring plate body is not connected to the base.

2. The optical component driving device according to claim 1, characterized in that: The spring plate has a first pin protruding outward from the spring plate body, and the movable end of the SMA driving part is disposed on the first pin.

3. The optical component driving device according to claim 2, characterized in that: The first pin is formed integrally with the spring plate.

4. The optical component driving device according to claim 2, characterized in that: The movable end portion of the first pin or the SMA driving portion slides relative to the base.

5. The optical component driving device according to claim 1, characterized in that: The parts of the two wrists fixed on the base are exposed to the outside.

6. The optical component driving device according to claim 1, characterized in that: The fixed-side end of the SMA driving portion is provided on a second pin provided on the base, and the second pin is exposed to the outside.

7. The optical component driving device according to claim 1, characterized in that: The optical component includes an optical component body and a rim portion provided around the optical component body, and the rim portion slides relative to a fixed-side end portion of the SMA driving portion.

8. The optical component driving device according to claim 1, characterized in that: The SMA cable of the SMA driving part is arranged at the same height as the spring plate in the normal direction of the plate surface of the spring plate.

9. The optical component driving device according to claim 1, characterized in that: The SMA cables of the SMA driving unit are arranged on both sides of the spring plate in the normal direction of the plate surface of the spring plate.

10. The optical component driving device according to claim 1, characterized in that: The fixing part also has a housing. The movable portion or the optical component on the movable portion slides relative to a sliding portion provided at the rear of the front wall of the housing.

11. A camera device, characterized in that: have: The optical component driving device according to claim 1; A lens assembly as the optical component; an AF lens assembly that allows light from a subject to pass through; as well as an image sensor receiving light passing through the AF lens assembly, The lens assembly is arranged between the object and the AF lens assembly.

12. The camera device according to claim 11, characterized in that An optical path refraction element is disposed between the lens assembly and the AF lens assembly.

13. A camera device, characterized in that: have: The optical component driving device according to claim 1; A lens assembly as the optical component; an AF lens assembly that allows light from a subject to pass through; as well as an image sensor receiving light passing through the AF lens assembly, The lens assembly is arranged between the AF lens assembly and the image sensor.

14. A camera device, characterized in that: have: The optical component driving device according to claim 1; an AF lens body that allows light from a subject to pass therethrough; and An image sensor as the optical member receives light passing through the AF lens body.

15. An electronic device, characterized in that: A camera device according to any one of claims 11 to 14.

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