Lens driving device, camera device, and electronic device

Abstract

The present invention provides a lens driving device, a camera device, and an electronic device, which can quickly converge the three-axis movements of a lens body. The lens driving device (1) in an XYZ orthogonal coordinate system includes: a base (25); a bracket (19) as an intermediate member; a carrier (15) as a movable part, having a mounting part for mounting the lens body (5); a suspension wire (24) disposed between the base (25) and the bracket (19) and extending along the Y direction, supporting the bracket (19) so as to be freely movable in the optical axis direction of the lens body (5), i.e., the X direction and the Z direction; and a linear upper side leaf spring (14) disposed between the bracket (19) and the carrier (15) and extending along the XZ direction, supporting the movable part so as to be freely movable in the Y direction. A damping rubber is disposed between the upper side leaf spring (14), the carrier (15) and the bracket (19), and a damping rubber is disposed between the suspension wire (24), the bracket (19) and the base (25).

Description

Technical Field

[0001] The present invention relates to a lens driving device, a camera device, and an electronic device for electronic devices such as smartphones. Background Art

[0002] Among lens driving devices having both an OIS (Optical Image Stabilizer) function and an AF (AutoFocus) function, there is a so-called periscope lens driving device. In the periscope lens driving device, a lens body and an image sensor are arranged side by side in a direction orthogonal to the incident direction of light from a subject, and the light from the subject is reflected by a prism or a mirror, passes through the lens body, converges on the image sensor, and is converted into an image signal by the image sensor. As a document disclosing a technique related to such a lens driving device, there is Patent Document 1. The camera module described in Patent Document 1 houses a lens prism unit and an actuator for driving the same in a housing formed by combining a base and a moving support structure. In this camera module, the lens prism unit is supported by four cables so as to be movable along two axes of OIS, and is supported by balls in an inner wall groove of the moving support structure so as to be movable along one axis of AF.

[0003]

Prior Art Documents

[0004]

Patent Documents

[0005]

Patent Document 1

[0006]

Problems to be Solved by the Invention

[0007] However, the technique of Patent Document 1 has a problem that it is difficult to quickly converge the three-axis movement of the lens body because the length in the optical axis direction of the lens body is long.

[0008] The present invention has been made in view of such problems, and an object thereof is to provide a lens driving device capable of quickly converging the three-axis movement of the lens body.

[0009]

Means for Solving the Problems

[0010] In order to solve the above problems, as a preferred embodiment of the present invention, a lens driving device in an XYZ orthogonal coordinate system includes: a base; an intermediate member; a movable portion having a mounting portion for mounting a lens body; a suspension wire disposed between the base and the intermediate member and extending along the Y direction, supporting the intermediate member so as to be freely movable in the optical axis direction of the lens body, i.e., the X direction and the Z direction; and a linear leaf spring disposed between the intermediate member and the movable portion and extending along the XZ direction, supporting the movable portion so as to be freely movable along the Y direction. A damping rubber is disposed between the leaf spring, the movable portion, and the intermediate member, and a damping rubber is disposed between the suspension wire, the intermediate member, and the base.

[0011] In this embodiment, it is also possible that the damping rubber is disposed between a damping rubber aggregation portion and the lower surface of the leaf spring located at a position above the two damping rubber aggregation portions, and the damping rubber aggregation portion is disposed opposite to the upper surface of the movable portion in the Y direction and the upper surface of the intermediate member.

[0012] Alternatively, the linear leaf spring has a twisted shape and is located at multiple positions above the same damping rubber aggregation portion.

[0013] Alternatively, four leaf springs are provided, and the path from the intermediate member of the leaf spring to the movable portion is symmetric with respect to the X direction and the Z direction as axes in a shape of four. When the lens body is mounted, the center of gravity position of the entire movable portion including the lens body coincides with the intersection of the symmetry axis in the X direction and the symmetry axis in the Z direction when viewed from the Y direction.

[0014] Alternatively, the shape of the entire movable portion including the lens body is asymmetric with respect to the symmetry axis in the Z direction.

[0015] Alternatively, the damping rubber is disposed between a damping rubber aggregation portion and the lower end of the suspension wire fixed on the damping rubber aggregation portion of the base, and the damping rubber aggregation portion is provided on the upper surface of the base in the Y direction and the side surfaces in the X direction and the Z direction facing the intermediate member.

[0016] Alternatively, the damping rubber aggregation portion provided on the base is formed by surrounding the periphery of the suspension wire with a wall on the upper surface of the base.

[0017] Alternatively, the damping rubber aggregation portion provided on the intermediate member is formed as a U-shaped recess that opens in the Z direction at the lower end of the intermediate member.

[0018] A camera device as another preferred embodiment of the present invention is characterized by including the above lens driving device.

[0019] An electronic device according to another preferred embodiment of the present invention is characterized by including the above-described camera device.

[0020]

Advantages of the Invention

[0021] The lens driving device of the present invention includes, in an XYZ orthogonal coordinate system: a base; an intermediate member; a movable part having a mounting part for mounting a lens body; a suspension wire disposed between the base and the intermediate member and extending along the Y direction, supporting the intermediate member so as to be freely movable in the optical axis direction of the lens body, i.e., the X direction and the Z direction; and a linear leaf spring disposed between the intermediate member and the movable part and extending along the XZ direction, supporting the movable part so as to be freely movable in the Y direction. A damping rubber is disposed between the leaf spring, the movable part, and the intermediate member, and a damping rubber is disposed between the suspension wire, the intermediate member, and the base. Therefore, a lens driving device capable of quickly damping the three-axis movements of the lens body can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 FIG. 12 is a front view of a smartphone 9 equipped with a camera device 2 including a lens driving device 1 according to an embodiment of the present invention.

[0023] Figure 2 is Figure 1 a perspective view of the lens driving device 1.

[0024] Figure 3 is an exploded Figure 2 perspective view of the lens driving device 1.

[0025] Figure 4 is a perspective view of removing the housing 11 from Figure 2 .

[0026] In Figure 5 , (A) is a perspective view of removing the frame 12 from Figure 4 , and (B) is an enlarged view of the rounded frame in (A).

[0027] In Figure 6 , (A) is a view of observing Figure 5 (A) from the +Y side, and (B) is an enlarged view of the rectangular frame in (A).

[0028]

Reference Signs

[0029] 1. Lens driving device; 2. Camera device; 3. Image sensor; 4. Mirror; 5. Lens unit; 9. Smart phone; 11. Housing; 12. Frame; 13. First coil for OIS; 14. Upper leaf spring; 15. Carrier; 16. Second coil for OIS; 17. Lower leaf spring; 18. Magnet for OIS; 19. Bracket; 20. Magnet for AF; 21. Magnet for detection; 22. Coil for AF; 23. FPC; 24. Suspension wire; 25. Base; 30. Metal plate member; 31, 33. First metal member; 35. Receiving part; 110. First opening; 120. Second opening; 121. Upright part; 122. Horizontal part; 123. Connecting part; 126. Second metal member; 150. Through hole; 151. Cylindrical body; 152. Second wall part; 153. Carrier receiving part; 190. Bracket opening; 191. Frame part; 192. First wall part; 193. U-shaped recess; 194. Bracket receiving part; 250. Upright part; 300. Through hole. Detailed implementation manner

[0030] Hereinafter, while referring to the attached Figure 1 while explaining the embodiments of the present invention. As Figure 1 shown, the camera device 2 including the lens driving device 1 as one embodiment of the present invention is housed in the smart phone 9.

[0031] The camera device 2 has an image sensor 3, a mirror 4 that reflects light from a subject, a lens unit 5 that guides the light reflected on the mirror 4 to the image sensor 3, and a lens driving device 1 that drives the lens unit 5.

[0032] Hereinafter, the direction in which light from the subject is incident is appropriately referred to as the Y direction. In addition, one direction in which the light reflected on the mirror 4 is directed toward the lens unit 5 is referred to as the X direction, and the direction orthogonal to both the Y direction and the Z direction is referred to as the Z direction. In addition, the +Y side is sometimes referred to as the upper side, the -Y side is referred to as the lower side, the +X side is referred to as the rear side, the -X side is referred to as the front side, the +Z side is referred to as the left side, and the -Z side is referred to as the right side.

[0033] The lens driving device 1 has a housing 11, a frame 12, a first coil for OIS 13, an upper leaf spring 14, a carrier 15, a second coil for OIS 16, a lower leaf spring 17, a magnet for OIS 18, a bracket 19, a magnet for AF 20, a magnet for detection 21, a coil for AF 22, an FPC 23, a suspension wire 24, and a base 25. Among them, the carrier 15, the second coil for OIS 16, and the magnet for detection 21 constitute a movable part. In addition, the magnet for OIS 18, the bracket 19, and the magnet for AF 20 constitute an intermediate part. In addition, the housing 11, the frame 12, the first coil for OIS 13, the coil for AF 22, the FPC 23, and the base 25 constitute a fixed part.

[0034] The movable part is supported by the bracket 19 of the intermediate member via the upper side leaf spring 14 and the lower side leaf spring 17. The movable part can move in the Y direction relative to the intermediate member. The intermediate member is supported by the base 25 of the fixed part via the suspension wire 24. The intermediate member can move in the X direction and the Z direction relative to the fixed part together with the supported movable part. Thus, the movable part can move in the X direction, the Y direction, and the Z direction relative to the fixed part. In addition, the first OIS coil 13, the second OIS coil 16, the OIS magnet 18, the AF magnet 20, and the AF coil 22 are driving sources for moving the lens body 5 relative to the base 25.

[0035] The housing 11 and the base 25 are combined into a housing. A first opening 110 is provided at the center of the rear side wall of the housing 11. A second opening 120 is provided from the center of the front side wall of the housing 11 to a portion straddling the upper side wall.

[0036] For the base 25, the main body of the base 25 is made of resin and formed in a state where the metal plate member 30 and the first metal members 31, 33 are arranged in the resin. At the rear side edge of the base 25, there is a standing portion 250 that stands upward. On the base 25, an FPC 23 serving as a circuit board is arranged.

[0037] The metal plate member 30 embedded in the base 25 is thinner than the thickness of the base 25 and is exposed to the upper and lower surface sides of the base 25 at positions corresponding to the carrier 15. The ends of the first metal members 31, 33 are exposed from the left and right end faces of the base 25. The first metal members 31, 33 embedded in the base 25 have through holes 300. The portions provided with the through holes 300 of the first metal members 31, 33 are exposed to the upper and lower surface sides of the base 25.

[0038] On the upper surface of the base 25, a receiving portion 35 for damping rubber is formed. The receiving portion 35 is a wall surrounding the periphery of the through hole 300 of the first metal members 31, 33. The damping rubber is a resin with viscoelasticity and has the function of attenuating vibration.

[0039] As Figure 5 shown, the lower end of the suspension wire 24 passes through the through hole 300 of the first metal member 31. The suspension wire 24 passes through the first metal member 31 of the base 25 and is soldered from the lower surface of the first metal member 31. Therefore, the lower end of the suspension wire 24 is fixed to the base 25, and the receiving portion 35 is formed by a wall surrounding the periphery of the lower end of the suspension wire 24.

[0040] On the lower surface of the FPC 23, an X-direction detection Hall element and a Y-direction detection Hall element serving as electrical components are mounted. The X-direction detection Hall element and the Y-direction detection Hall element are housed in the housing space of the base 25. On the left and right sides of the upper surface of the FPC 23, AF coils 22 are provided.

[0041] For the frame 12, the body of the frame 12 is formed by molding in a state where a second metal component 126 is disposed within a resin. An end portion of the second metal component 126 protrudes from the lower end portion of the frame 12. The second metal component 126 forms an electric wire and serves both as a reinforcement for the frame 12 and as an electric wire. The lower end portion of the frame 12 is fixed to the base 25. The protruding end portion of the second metal component 126 is electrically connected to the FPC 23.

[0042] The frame 12 includes: two upright portions 121 that stand up from the left side of the base 25; two upright portions 121 that stand up from the right side; left and right horizontal portions 122 that connect the left and right upright portions 121 respectively; and a connecting portion 123 that connects the left and right horizontal portions 122. The two upright portions 121 face each other in the optical axis direction. On the lower surface of the right horizontal portion 122 of the frame 12, a first coil 13 for OIS and a Hall element for Z-direction detection, which are electrical components, are provided and are respectively electrically connected to the second metal component 126. On the lower surface of the left horizontal portion 122 of the frame 12, a first coil 13 for OIS, which is an electrical component, is provided and is electrically connected to the second metal component 126.

[0043] The bracket 19 has a frame portion 191 that surrounds the bracket opening 190 and a first wall portion 192 that extends forward from the left and right peripheral portions of the frame portion 191. At the lower ends of the front, rear, left, and right corners of the first wall portion 192, U-shaped recesses 193 that open in the Z direction are provided. On the upper surface of the first wall portion 192, a magnet 18 for OIS is provided. On the lower surface of the first wall portion 192, a magnet 20 for AF is provided. The upper side plate spring 14 is fixed to the upper surface of the bracket 19, and the lower side plate spring 17 is fixed to the lower surface. The upper side plate spring 14 forms a linear shape that extends while being twisted from the inner sides of the front, rear, left, and right at the upper side of the bracket 19. The lower side plate spring 17 forms a linear shape that extends while being twisted from the front, rear, left, and right toward the inner side at the lower side of the bracket 19.

[0044] The carrier 15 is a lens support body that supports the lens body 5. The carrier 15 has a cylindrical body 151 and a second wall portion 152 that extends forward from the peripheral portions on the left and right sides of the cylindrical body 151. The second wall portion 152 is formed by cutting off the upper and lower portions at the front of the cylindrical body 151. In the cylindrical body 151, there is a through hole 150. The through hole 150 is an installation portion for the lens body 5. After the lens driving device 1 is completed, the lens body 5 is installed in the carrier 15 by being inserted into the through hole 150 between the left and right second wall portions 152 of the carrier 15. For the carrier 15, the upper side is supported in the front, rear, left, and right directions by the upper side plate spring 14, and the lower side is supported in the front, rear, left, and right directions by the lower side plate spring 17. The center of gravity of the movable portion including the lens body 5 and the carrier 15 that supports it is located at approximately the center of the upper side plate spring 14 and the lower side plate spring 17 in the front, rear, left, and right directions.

[0045] If details are described, then asFigure 6 As shown in (A) of , there are four upper side leaf springs 14, and the path from the bracket 19 of the upper side leaf spring 14 to the carrier 15 is in a shape that is line-symmetric with respect to the X direction and the Z direction with four. When the lens body 5 is installed, the center-of-gravity position of the entire movable part including the lens body 5 coincides with the intersection of the symmetry axis in the X direction and the symmetry axis in the Z direction when observed from the Y direction. The shape of the entire movable part including the lens body 5 is asymmetric with respect to the symmetry axis in the above-mentioned Z direction, but thereby, when the movable part including the lens body 5 moves along the Y direction, the movable part is difficult to tilt. For the lower side leaf spring 14, the structure is the same as that of the upper side leaf spring 14. In addition, the center-of-gravity position preferably becomes the intermediate position between the upper side leaf spring 14 and the lower side leaf spring 17.

[0046] On the outer surface of the left and right second wall portions 152 of the carrier 15, a second coil 16 for OIS is provided. On the lower surface of the rear portion of the second wall portion 152, a detection magnet 21 is provided. In addition, the connecting portion 123 of the frame 12 is provided at the portion where the upper side portion of the cylindrical body 151 is cut off, and when observed from the X direction, the cylindrical body 151 and the connecting portion 123 overlap.

[0047] The suspension wire 24 passes through the U-shaped recess 193 of the bracket 19 and is spanned between the through hole 300 of the base 25 and the upper side leaf spring 14. The lower end of the suspension wire 24 is inserted and soldered to the through hole 300 of the base 25. The upper end of the suspension wire 24 is inserted and soldered to the front end portion of the upper side leaf spring 14 that forms an annular shape outside the bracket 19.

[0048] Also as Figure 5 As shown in (B) of , a damping rubber is disposed between the lower end portion of the suspension wire 24, the U-shaped recess 193 of the bracket 19, and the receiving portion 35 of the base 25. The U-shaped recess 193 is provided at a distance directly above the receiving portion 35 and forms a damping rubber accumulation portion together with the receiving portion 35.

[0049] As Figure 6 As shown in (B) of , on the upper surface of the carrier 15, a carrier receiving portion 153 is recessed downward. In addition, on the upper surface of the bracket 9, a bracket receiving portion 194 is recessed downward. The carrier receiving portion 153 and the bracket receiving portion 194 are disposed opposite to each other with a gap therebetween, and above the two, the lower surface of the twisted portion of the upper side leaf spring 14 is disposed opposite to each other with a gap therebetween. A damping rubber is disposed between the twisted portion of the upper side leaf spring 14 and the carrier receiving portion 153 and the bracket receiving portion 194. The carrier receiving portion 153 and the bracket receiving portion 194 form a damping rubber accumulation portion. The twisted portion may be located at multiple positions above the same damping rubber accumulation portion.

[0050] The second coil 16 for OIS that constitutes the movable part faces the magnet 18 for OIS that constitutes the intermediate part. When a current flows through the second coil 16 for OIS, an electromagnetic force in the Y direction is generated in the second coil 16 for OIS, and the movable part moves in the Y direction relative to the intermediate part. The Hall element for Y-direction detection detects the magnetic field of the detection magnet 21 facing it and outputs a signal representing the detection result. This signal corresponds to the position of the detection magnet 21 in the Y direction relative to the Hall element for Y-direction detection.

[0051] The magnet 18 for OIS that constitutes the intermediate part and the first coil 13 for OIS that constitutes the fixed part face each other. When a current flows through the first coil 13 for OIS, an electromagnetic force in the Z direction is generated in the first coil 13 for OIS, and a reaction force is generated on the magnet 18 for OIS, and the intermediate part moves in the Z direction relative to the fixed part. The Hall element for Z-direction detection detects the magnetic field of the magnet 18 for OIS facing it and outputs a signal representing the detection result. This signal corresponds to the position of the magnet 18 for OIS in the Z direction relative to the Hall element for Z-direction detection.

[0052] The magnet 20 for AF that constitutes the intermediate part and the coil 22 for AF that constitutes the fixed part face each other. When a current flows through the coil 22 for AF, an electromagnetic force in the X direction is generated in the coil 22 for AF, and a reaction force is generated on the magnet 20 for AF, and the intermediate part moves in the X direction relative to the fixed part. The Hall element for X-direction detection detects the magnetic field of the magnet 20 for AF facing it and outputs a signal representing the detection result. This signal corresponds to the position of the magnet 20 for AF in the X direction relative to the Hall element for X-direction detection.

[0053] The lens driving device 1 in the present embodiment includes, in the XYZ orthogonal coordinate system: a base 25; a bracket 19 as an intermediate part; a carrier 15 as a movable part, having a mounting part for mounting the lens body 5; a suspension wire 24 disposed between the base 25 and the bracket 19 and extending along the Y direction, supporting the bracket 19 so as to be freely movable along the optical axis direction of the lens body 5, i.e., the X direction and the Z direction; and a linear upper side leaf spring 14 disposed between the bracket 19 and the carrier 15 and extending along the XZ direction, supporting the movable part so as to be freely movable along the Y direction. A damping rubber is disposed between the upper side leaf spring 14, the carrier 15, and the bracket 19, and a damping rubber is disposed between the suspension wire 24, the bracket 19, and the base 25. Thereby, a lens driving device 1 capable of quickly converging the three-axis movements of the lens body 5 can be provided.

[0054] In addition, in the above embodiment, the receiving part 35 may not be provided on the base 25, and a damping rubber may be disposed between the U-shaped concave part 193 of the bracket 19 and the upper surface of the base 25.

Claims

1. A lens driving device, characterized in that, In an XYZ orthogonal coordinate system, it includes: a base; an intermediate member; a movable part having a mounting portion for mounting a lens body; a suspension wire disposed between the base and the intermediate member and extending along the Y direction, supporting the intermediate member so as to be freely movable in the optical axis direction of the lens body, i.e., the X direction and the Z direction; and a linear leaf spring disposed between the intermediate member and the movable part and extending along the XZ direction, supporting the movable part so as to be freely movable in the Y direction, a damping rubber is disposed between the leaf spring, the movable part and the intermediate member, and a damping rubber is disposed between the suspension wire, the intermediate member and the base.

2. The lens driving device according to claim 1, wherein the damping rubber is disposed between the damping rubber aggregation portion and the lower surface of the leaf spring located above the two damping rubber aggregation portions, and the damping rubber aggregation portion is disposed opposite to the upper surface of the movable part in the Y direction and the upper surface of the intermediate member.

3. The lens driving device according to claim 2, wherein the linear leaf spring has a twisted shape and is located at multiple positions above the same damping rubber aggregation portion.

4. The lens driving device according to claim 1, wherein 4 leaf springs are provided, and the path from the intermediate member of the leaf spring to the movable part is in a shape that is line-symmetric about the X direction and the Z direction, when the lens body is installed, the center of gravity position of the entire movable part including the lens body coincides with the intersection point of the symmetry axis in the X direction and the symmetry axis in the Z direction when observed from the Y direction.

5. The lens driving device according to claim 4, wherein the shape of the entire movable part including the lens body is asymmetric with respect to the symmetry axis in the Z direction.

6. The lens driving device according to claim 1, wherein the damping rubber is disposed between the damping rubber aggregation portion and the lower end of the suspension wire fixed at the damping rubber aggregation portion of the base, and the damping rubber aggregation portion is provided on the upper surface of the base in the Y direction and the side surfaces in the X direction and the Z direction facing the intermediate member.

7. The lens driving device according to claim 6, wherein the damping rubber aggregation portion provided on the base is formed by surrounding the upper surface of the base and the periphery of the suspension wire with a wall.

8. The lens driving device according to claim 6, wherein the damping rubber aggregation portion provided on the intermediate member is formed as a U-shaped recess that opens in the Z direction at the lower end of the intermediate member.

9. A camera device, characterized in that, It includes the lens driving device according to any one of claims 1 to 8.

10. An electronic device, characterized in that, It includes the camera device according to claim 9.

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