Lens driving device, camera device, and electronic equipment

Abstract

The present invention provides a lens driving device, a camera device and an electronic device, which can reduce the thickness of the base in a periscope type. The lens driving device (1) comprises: a carrier (15) having a mounting portion for mounting a lens body (5); a base (25) having a resin body and a metal plate component (30) formed by embedding the resin body, supporting the carrier (15) in a movable manner, an opening (253) being provided at the center of the resin body, the metal plate component (30) being arranged to block the opening (253), and the carrier (15) and the metal plate component (30) directly facing each other at the opening (253).

Description

Technical Field

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

[0002] Among lens drive devices that have both OIS (Optical Image Stabilizer) and AF (AutoFocus) functions, there is a type called a periscope lens drive device. In a periscope lens drive 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. The light from the subject is reflected by a prism or a reflector, converged to the image sensor through the lens body, and converted into an image signal by the image sensor. As a document that discloses technology related to such a lens drive device, there is Patent Document 1. The lens drive device of Patent Document 1 has a fixed portion, a movable portion, an elastic element, and a drive component. The fixed portion has a housing, a base, a frame, and a circuit element, and the movable portion has a carrier. The circuit element sends an electrical signal to control the drive component to perform the OIS function and the AF function.

[0003] [Prior art literature]

[0004] [Patent Literature]

[0005] [Patent Document 1] Japanese Patent Application Publication No. 2019-139223A Summary of the invention

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

[0007] In the conventional periscope lens driving device, the base is formed of resin, and the portion directly below the lens body, which needs to be thinner, is hollowed out. However, in such a structure, the strength is insufficient, so there is a problem that it is difficult to reduce the thickness of the base.

[0008] The present invention has been made in view of such a problem, and an object of the present invention is to provide a periscope-type lens driving device in which a base can be made thinner.

[0009]

Solutions to Solve the Problem

[0010] In order to solve the above-mentioned problems, a lens driving device as a preferred embodiment of the present invention comprises: a carrier, which has a mounting portion for mounting a lens body; a base, which has a resin body and a metal plate component embedded in the above-mentioned resin body, supporting the above-mentioned carrier in a movable manner, and an opening portion is provided in the center of the above-mentioned resin body corresponding to the above-mentioned carrier, and the above-mentioned metal plate component is configured to block the above-mentioned opening portion. At the position of the above-mentioned opening portion, the above-mentioned metal plate component is exposed on the upper and lower surfaces, and the above-mentioned carrier is directly opposite to the above-mentioned metal plate component in the above-mentioned opening portion, the lower surface of the above-mentioned metal plate component is aligned with the lower surface of the above-mentioned resin body, and the upper surface of the above-mentioned metal plate component is lower than the upper surface of the above-mentioned resin body.

[0011] In this aspect, a black layer may be formed on the upper surface of at least a portion of the metal plate member exposed from the opening.

[0012] Furthermore, the lower surface of the metal plate member may be aligned with the lower surface of the resin body, and the upper surface of the metal plate member may be lower than the upper surface of the resin body.

[0013] Furthermore, the sheet metal member may include an arm portion that is bent upward relative to the base portion and extends to both left and right sides, and the front end of the arm portion may be exposed from the side surface of the resin body.

[0014] Furthermore, the metal plate member may be provided with a through hole extending in a vertical direction, and the through hole may be buried in the resin body.

[0015] Furthermore, a lower surface of the carrier directly facing the metal plate member may be located below an upper surface of the resin body.

[0016] Furthermore, the entire outer edge of the base portion of the metal plate member may be located outside the opening.

[0017] Furthermore, a metal member for soldering separate from the metal plate member may be embedded in the resin body.

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

[0019] Another preferred embodiment of the present invention is an electronic device comprising the camera device described above.

[0020]

Effects of the invention

[0021] The lens driving device of the present invention comprises: a carrier having a mounting portion for mounting a lens body; a base having a resin body and a metal plate member formed by embedding the resin body, supporting the carrier in a movable manner, an opening portion being provided at the center of the resin body, the metal plate member being arranged to block the opening portion, and the carrier and the metal plate member being directly opposite to each other on the opening portion. Thus, a lens driving device having a thin base in a periscope type can be provided. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0023] Figure 2 yes Figure 1 A stereoscopic view of the lens driving device 1.

[0024] Figure 3 It is decomposed Figure 2 A stereoscopic view of the lens driving device 1.

[0025] Figure 4 is from Figure 2 A perspective view without the housing 11.

[0026] Figure 5 is from Figure 4 A perspective view with the frame 12 removed.

[0027] Figure 6 In the above example, (A) indicates Figure 4 FIG. 2 is a perspective view of a base 25 , and FIG. 3 is a view showing a metal plate component 30 and first metal components 31 , 33 embedded in a resin body of the base 25 .

[0028] Figure 7 (A) is viewed from the opposite side. Figure 6 (A) is the view from the opposite side, (B) is the view from the opposite side Figure 6 Figure (B).

[0029]

Explanation of symbols

[0030] 1 Lens drive device; 2 Camera device; 3 Image sensor; 4 Reflector; 5 Lens body; 9 Smartphone; 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 AF magnet; 21 Detection magnet; 22 AF coil; 23 FPC; 24 Suspension wire; 25 Base; 30 Metal plate component; 31, 33 First metal Auxiliary parts; 35 receiving part; 36 convex part; 37, 38, 39 storage space; 110 first opening; 120 second opening; 121 upright part; 122 horizontal part; 123 connecting part; 126 second metal part; 150 through hole; 151 cylinder; 152 second wall; 190 bracket opening; 191 frame; 192 first wall; 193 U-shaped recessed part; 250 upright part; 253 opening; 300 through hole; 305 base; 306 protruding part. DETAILED DESCRIPTION

[0031] Below, while referring to the attached Figure 1 The embodiments of the present invention are described below. Figure 1 As shown, a camera device 2 including a lens driving device 1 according to an embodiment of the present invention is accommodated in a smartphone 9 .

[0032] The camera device 2 includes an image sensor 3 , a reflector 4 that reflects light from a subject, a lens 5 that guides the light reflected by the reflector 4 to the image sensor 3 , and a lens driving device 1 that drives the lens 5 .

[0033] 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 by the reflector 4 is directed toward the lens body 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.

[0034] The lens driving device 1 includes a housing 11, a frame 12, a first coil 13 for OIS, an upper leaf spring 14, a carrier 15, a second coil 16 for OIS, a lower leaf spring 17, a magnet 18 for OIS, a bracket 19, a magnet 20 for AF, a magnet 21 for detection, a coil 22 for AF, an FPC 23, a suspension wire 24, and a base 25. Among them, the carrier 15, the second coil 16 for OIS, and the magnet 21 for detection constitute a movable part. In addition, the magnet 18 for OIS, the bracket 19, and the magnet 20 for AF constitute an intermediate part. In addition, the housing 11, the frame 12, the first coil 13 for OIS, the coil 22 for AF, the FPC 23, and the base 25 constitute a fixed part.

[0035] The movable part is supported on the bracket 19 of the intermediate component via the upper leaf spring 14 and the lower leaf spring 17. The movable part can move in the Y direction relative to the intermediate component. The intermediate component is supported on the base 25 of the fixed part via the suspension wire 24. The intermediate component 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 coil 13 for OIS, the second coil 16 for OIS, the magnet 18 for OIS, the magnet 20 for AF and the coil 22 for AF are driving sources for moving the lens body 5 relative to the base 25.

[0036] The housing 11 and the base 25 are combined into a frame. A first opening 110 is provided at the center of the rear wall of the housing 11. A second opening 120 is provided from the center of the front wall of the housing 11 to a portion extending across the upper wall.

[0037] The base 25 is formed by molding a resin body with the metal plate member 30 and the first metal members 31 and 33 arranged in the resin. A rising portion 250 rising upward is present at the rear edge of the base 25. The FPC 23 as a circuit board is arranged on the base 25.

[0038] An opening 253 is provided at the center of the resin body of the base 25 corresponding to the carrier 15. The opening 253 is in a T-shape with the front side expanded. The metal plate member 30 is buried in the resin body so as to block the opening 253. A black layer is formed on the surface of the metal plate member 30.

[0039] The metal plate component 30 has a base 305 and three pairs of arms 306. The base 305 is the main body of the metal plate component 30, and its outer edges are all located outside the opening 253 to prevent light from entering from the outside. The arms 306 are bent upward relative to the base 305 and extend to the left and right sides. The frontmost pair of arms 306 has a through hole that penetrates along the up-down direction at its root, is covered with the resin of the base 25 body, and its front end is exposed to the outside from the side of the resin body of the base 25. The upper surface and the front end of the middle pair of arms 306 are exposed from the resin body of the base 25. The rearmost pair of arms 306 are covered with the resin of the base 25 body as a whole. In addition, on the base 305, through holes along the up-down direction are provided at the left and right ends of the center in the front-to-back direction and the left and right ends of the rear end. The resin of the base 25 body and the metal plate component 30 are firmly combined through the three pairs of arms 306 and the three pairs of through holes. The lower surface of the metal plate component 30 and the lower surface of the resin body are aligned. The metal plate component 30 is thinner than the base 25 body, and the upper surface of the metal plate component 30 is located at a lower position than the upper surface of the resin body. At the position of the opening 253, the metal plate component 30 is exposed on the upper and lower surfaces. The lower surface of the carrier 15 is directly opposite to the upper surface of the metal plate component 30. In addition, the lower surface of the carrier 15 is located at a lower side than the upper surface of the resin body. When there is a black layer on the surface of the metal plate, since the conductivity or solderability is often poor, the first metal component 31 with good conductivity and solderability is buried in the base 25.

[0040] The first metal component 31 is in the shape of a cross having four arms and a cross. The first metal component 33 has a shape that is formed by connecting two crosses and having six arms, one connecting arm, and two crosses. The first metal component 31 is provided with a through hole 300 that penetrates in the vertical direction at the cross, and the first metal component 33 is provided with a through hole 300 that penetrates in the vertical direction at each of the two crosses. The arms around the through holes 300 of the first metal components 31 and 33 are bent obliquely downward at the connecting arm, and the front end portions are further bent so as to be horizontal. The connecting arm is not bent.

[0041] The intersection of one through hole 300 in the first metal component 31 and the intersection of two through holes 300 in the first metal component 33 are also exposed from the base 25 on the upper and lower surfaces. The front end of the left arm of the first metal component 31, 33 on the left side and the front end of the right arm of the first metal component 31, 33 on the right side are exposed from the base 25.

[0042] A receiving portion 35 of the damping rubber is formed on the upper surface of the base 25. The receiving portion 35 is formed by surrounding the periphery of the through hole 300 of the first metal component 31 and the periphery of the front through hole 300 of the two through holes 300 of the first metal component 33 through a partition wall. The damping rubber is a resin having viscoelasticity and has the function of attenuating vibration.

[0043] A solder storage space 39 is formed on the lower surface of the base 25. The storage space 39 is formed by being recessed in the space formed by the first metal members 31 and 33 in a truncated cone shape with the through hole 300 as the center.

[0044] The lower end of the suspension wire 24 is passed through the through hole 300 on the front side of the first metal component 33 and the through hole 300 of the first metal component 31. The suspension wire 24 passes through the base 25 and is soldered from the bottom surface to the intersection of the front side of the first metal component 33 and the intersection of the first metal component 31 by the solder in the storage space 39. The suspension wire 24 is thus joined and fixed to the first metal components 31 and 33, and is electrically connected to the first metal component 33.

[0045] The X-direction detection Hall element and the Y-direction detection Hall element are mounted as electrical components on the lower surface of the FPC 23. The base 25 is provided with a storage space 37 for storing the X-direction detection Hall element and a storage space 38 for storing the Y-direction detection Hall element. The left and right sides of the upper surface of the base 25 are provided with protrusions 36. The AF coil 22 is wound around the protrusions 36 on the upper surface of the FPC 23.

[0046] The frame 12 is formed by molding a body of the frame 12 with a resin and a second metal component 126 disposed in the resin. The end of the second metal component 126 protrudes from the lower end of the frame 12. The second metal component 126 forms an electric wire and serves both as a reinforcement of the frame 12 and as an electric wire. The lower end of the frame 12 is fixed to the base 25. The end of the protruding second metal component 126 is electrically connected to the FPC 23.

[0047] The frame 12 has two rising parts 121 rising from the left side of the base 25; two rising parts 121 rising from the right side; left and right horizontal parts 122 respectively connecting the two rising parts 121; and a connecting part 123 connecting the left and right horizontal parts 122. The two rising parts 121 are opposite to each other in the optical axis direction. On the lower surface of the right horizontal part 122 of the frame 12, the first coil 13 for OIS and the Hall element for Z-direction detection are provided as electrical components, which are electrically connected to the second metal component 126 respectively. On the lower surface of the left horizontal part 122 of the frame 12, the first coil 13 for OIS is provided as an electrical component, which is electrically connected to the second metal component 126.

[0048] The bracket 19 has a frame portion 191 surrounding the bracket opening 190 and a first wall portion 192 extending from the left and right peripheral portions of the frame portion 191 toward the front side. At the lower ends of the front, rear, left and right corners of the first wall portion 192, a U-shaped recess 193 opening in the Z direction is provided. On the upper surface of the first wall portion 192, an OIS magnet 18 is provided. On the lower surface of the first wall portion 192, an AF magnet 20 is provided. An upper leaf spring 14 is fixed to the upper surface of the bracket 19, and a lower leaf spring 17 is fixed to the lower surface. The upper leaf spring 14 is formed on the upper side of the bracket 19 in a linear shape that is twisted and extends from the front, rear, left and right inner sides. The lower leaf spring 17 is formed on the lower side of the bracket 19 in a linear shape that is twisted and extends from the front, rear, left and right inner sides.

[0049] The carrier 15 is a lens support body that supports the lens body 5. The carrier 15 has a cylinder 151 and a second wall portion 152 extending from the peripheral portion of the left and right sides of the cylinder 151 to the front side. The second wall portion 152 is formed by cutting off the upper part and the lower part of the front part of the cylinder 151. In the cylinder 151, there is a through hole 150. The through hole 150 is a mounting portion of the lens body 5. After the lens driving device 1 is completed, the lens body 5 is mounted on the carrier 15 by inserting the through hole 150 between the left and right second walls 152 of the carrier 15. For the carrier 15, the upper front, back, left, and right sides are supported by the upper leaf spring 14, and the lower front, back, left, and right sides are supported by the lower leaf spring 17. The center of gravity of the movable part including the lens body 5 and the carrier 15 supporting it is located approximately at the center of the upper leaf spring 14 and the lower leaf spring 17 on the front, back, left, and right sides.

[0050] The second coil 16 for OIS is provided on the outer surface of the left and right second wall portions 152 of the carrier 15. The detection magnet 21 is provided on the rear lower surface of the second wall portion 152. In addition, the connecting portion 123 of the frame 12 is provided at the portion where the upper portion of the cylinder 151 is cut away, and when viewed from the X direction, the cylinder 151 and the connecting portion 123 overlap.

[0051] The suspension wire 24 passes through the U-shaped recess 193 of the bracket 19 and is laid between the through hole 300 of the base 25 and the upper leaf spring 14. The lower end of the suspension wire 24 is inserted through and soldered to the through hole 300 of the base 25. The upper end of the suspension wire 24 is inserted through and soldered to the front end portion of the upper leaf spring 14 formed in a ring shape outside the bracket 19.

[0052] Shock-absorbing rubber is disposed between the lower end 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 just above the receiving portion 35, and together with the receiving portion 35, the shock-absorbing rubber gathers.

[0053] The second OIS coil 16 constituting the movable part and the OIS magnet 18 constituting the intermediate member are opposite to each other. When a current flows through the second OIS coil 16, an electromagnetic force in the Y direction is generated in the second OIS coil 16, and the movable part moves in the Y direction relative to the intermediate member. The Y-direction detection Hall element detects the magnetic field of the opposing detection magnet 21 and outputs a signal indicating the detection result. The signal corresponds to the Y-direction position of the detection magnet 21 relative to the Y-direction detection Hall element.

[0054] The OIS magnet 18 constituting the intermediate component and the first OIS coil 13 constituting the fixed portion are opposite to each other. When current flows through the first OIS coil 13, an electromagnetic force in the Z direction is generated on the first OIS coil 13, and a reaction force is generated on the OIS magnet 18, so that the intermediate component moves in the Z direction relative to the fixed portion. The Z-direction detection Hall element detects the magnetic field of the opposite OIS magnet 18 and outputs a signal indicating the detection result. The signal corresponds to the Z-direction position of the OIS magnet 18 relative to the Z-direction detection Hall element.

[0055] The AF magnet 20 constituting the intermediate member and the AF coil 22 constituting the fixed portion are opposed to each other. When current flows through the AF coil 22, an electromagnetic force in the X direction is generated in the AF coil 22, and a reaction force is generated on the AF magnet 20, so that the intermediate member moves in the X direction relative to the fixed portion. The X-direction detection Hall element detects the magnetic field of the opposing AF magnet 20 and outputs a signal indicating the detection result. This signal corresponds to the X-direction position of the AF magnet 20 relative to the X-direction detection Hall element.

[0056] The lens driving device 1 in this embodiment includes: a carrier 15 having a mounting portion for mounting a lens body 5; a base 25 having a resin body and a metal plate member 30 embedded in the resin body, supporting the carrier 15 in a movable manner, an opening 253 is provided in the center of the resin body corresponding to the carrier 15, and the metal plate member 30 is provided to block the opening 253, and the carrier 15 and the metal plate member 30 are directly opposite to each other in the opening 253. Therefore, it is possible to provide a lens driving device 1 in which the base 25 is thinned in a periscope type.

[0057] In the above-described embodiment, instead of making the entire metal plate member 30 black, only the portion of the metal plate member 30 exposed from the T-shaped opening 253 may be made black.

[0058] In addition, the lower surface of the metal plate member 30 may not be aligned with the lower surface of the resin body, but may be higher than the lower surface of the resin body.

Claims

1. A lens driving device, characterized in that: have: a carrier having a mounting portion for mounting the lens body; and A base having a resin body and a metal plate member embedded in the resin body, and supporting the carrier in a movable manner. An opening is provided at the center of the resin body corresponding to the carrier, the metal plate member is arranged to block the opening, the metal plate member is exposed on the upper and lower surfaces at the position of the opening, and the carrier and the metal plate member are directly opposed to each other in the opening. The lower surface of the metal plate component is aligned with the lower surface of the resin body, and the upper surface of the metal plate component is lower than the upper surface of the resin body.

2. The lens driving device according to claim 1, characterized in that: A black layer is formed on the upper surface of at least a portion of the metal plate member exposed from the opening.

3. The lens driving device according to claim 1, characterized in that: The metal plate member includes an arm portion that is bent upward relative to the base portion and extends to both left and right sides, and the front end of the arm portion is exposed from the side surface of the resin body.

4. The lens driving device according to claim 1, characterized in that: The metal plate member is provided with a through hole penetrating in the vertical direction, and the resin body is buried in the through hole.

5. The lens driving device according to claim 1, characterized in that: A lower surface of the carrier directly facing the metal plate member is located below an upper surface of the resin body.

6. The lens driving device according to claim 1, characterized in that: The outer edge of the base of the metal plate member is entirely located outside the opening.

7. The lens driving device according to claim 1, characterized in that: A metal member for soldering, which is separate from the metal plate member, is buried in the resin body.

8. A camera device, characterized in that: A lens 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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