Anti-shake device, camera module and electronic device

Abstract

An anti-shake device includes a base, a supporting body movably arranged on the base, and a driving member driving the supporting body to move relative to the base, the driving member includes a conductive structure arranged on the supporting body, a plurality of positive pads arranged on the base, and an SMA wire connecting each positive pad and the conductive structure. When current flows from the positive pad into the SMA wire, the SMA wire is deformed by heat, thereby generating a traction force F on the SMA wire for pulling the conductive structure. Under the joint action of the plurality of traction forces F, the conductive structure drives the supporting body to rotate in a plane parallel to the base. The anti-shake device provided by the present invention uses the deformation of the SMA wire to achieve the traction of the supporting body to move, realizes shake compensation, and is beneficial to improving the imaging quality of the fixed-focus lens. In addition, the present invention also provides a camera module and an electronic device.

Description

Technical Field

[0001] The invention relates to an anti-shake device, a camera module and an electronic device. Background Art

[0002] A prime lens is a lens with only a fixed focal length. It has the characteristics of fast focusing speed and stable imaging quality.

[0003] In the prior art, fixed-focus lenses usually do not have an anti-shake function, and when shaking or tilting occurs, the image quality deteriorates. Summary of the invention

[0004] In view of this, the present invention provides an anti-shake device which can be used in a camera module so that the camera module has an anti-shake function.

[0005] In addition, it is also necessary to provide a camera module, which has the above-mentioned anti-shake device.

[0006] In addition, it is also necessary to provide an electronic device having the above-mentioned fixed-focus lens.

[0007] An anti-shake device includes a base, a supporting body movably arranged on the base, and a driving member that drives the supporting body to move relative to the base, the driving member includes a conductive structure arranged on the supporting body, a plurality of positive pads arranged on the base, and an SMA wire connecting each of the positive pads and the conductive structure. When current flows from the positive pad into the SMA wire, the SMA wire is deformed by heat, thereby generating a traction force F on the SMA wire for pulling the conductive structure. Under the joint action of the plurality of traction forces F, the conductive structure drives the supporting body to rotate in a plane parallel to the base. When the current stops flowing into the SMA wire, the SMA wire cools and returns to its original shape, so that the traction force F disappears and the supporting body returns to its original position.

[0008] Furthermore, the conductive structure includes four first vertices, the base includes four second vertices opposite to the first vertices, one end of each of the SMA wires is connected to one of the first vertices of the conductive structure, and the other end is connected to one of the second vertices of the base, and the first vertices and the second vertices connected to the same SMA wire are staggered with each other.

[0009] Furthermore, the driving component also includes a negative electrode pad arranged on the base and a conductive wire connecting the conductive structure and the negative electrode pad, so that the current flowing in from the positive electrode pad flows into the conductive structure through the SMA wire, then flows into the conductive wire from the conductive structure, and then flows into the negative electrode pad from the conductive wire.

[0010] Furthermore, the base includes a base body and a plurality of protrusions extending from the surface of the base body away from the supporting body, the second vertex is located at the base body, and the positive pad and the negative pad are formed on the surface of the protrusion.

[0011] Furthermore, a plurality of wire grooves are provided between the first vertex and the protrusion, and conductive circuits are provided in the wire grooves. The conductive circuits are used to electrically connect the positive electrode pad and the SMA wire, and the negative electrode pad and the conductive wire.

[0012] Furthermore, the conductive structure and the conductive line are formed by LDS technology.

[0013] Furthermore, the base body protrudes toward one side of the supporting body at the position of each of the second vertices to form a supporting portion, the supporting portion is provided with a first hollowed-out area, and the supporting body is provided with a second hollowed-out area in an area corresponding to and adjacent to the first hollowed-out area, a part of a ball can be rollably accommodated in the first hollowed-out area, and another part of the ball can be rollably accommodated in the second hollowed-out area.

[0014] Furthermore, the anti-shake device also includes a shell, which is mounted on the outside of the supporting body and the base. A plurality of elastic members are provided on the outside of the supporting body, and the elastic members abut against the inner side of the shell. The elastic members are used to restore the supporting body to its original position.

[0015] Furthermore, the base and the supporting body are made of a material selected from the group consisting of polyamide, polycarbonate, polyester, and liquid crystal polymer.

[0016] A camera module comprises the anti-shake device as described above.

[0017] An electronic device comprises the camera module as described above.

[0018] The anti-shake device provided by the present invention uses the deformation of the SMA wire to realize the movement of the traction support body and realize the shake compensation, which is beneficial to improving the imaging quality of the fixed-focus lens. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 A schematic diagram of an anti-shake device provided by an embodiment of the present invention.

[0020] Figure 2 for Figure 1 An exploded view of the anti-shake device is shown.

[0021] Figure 3 for Figure 1 The schematic diagram of the anti-shake device shown is shown with the shell and cover removed.

[0022] Figure 4 for Figure 1 Schematic diagram of the wiring and force conditions of the anti-shake device shown.

[0023] Figure 5 for Figure 1 The anti-shake device is shown in a cross-sectional view along line VV.

[0024] Figure 6 A schematic diagram of a camera module provided by an embodiment of the present invention.

[0025] Figure 7 A schematic diagram of an electronic device provided by an embodiment of the present invention.

[0026] Main component symbols

[0027] Anti-shake device 100

[0028] Base 10

[0029] Second Vertex 101

[0030] Base body 102

[0031] Support body 20

[0032] Driving member 30

[0033] Conductive structure 31

[0034] First Vertex 311

[0035] Positive pad 32

[0036] SMA Wire 33

[0037] Negative pad 35

[0038] Conductive thread 36

[0039] Projection 12

[0040] Wire guide 13

[0041] Conductive circuit 131

[0042] Supporting part 111

[0043] The first hollowed-out area 112

[0044] The second hollowed-out area 113

[0045] Ball 40

[0046] Housing 50

[0047] Elastic member 22

[0048] Cover 60

[0049] Fixed focus lens 201

[0050] Camera module 200

[0051] Mirror mount 203

[0052] Circuit board 205

[0053] Adhesive layer 206

[0054] Electronic device 300

[0055] The following specific implementation manner will further illustrate the present invention in conjunction with the above-mentioned accompanying drawings. DETAILED DESCRIPTION

[0056] The following will be combined with specific embodiments and attached Figure 1-7 The technical solution of the present invention is described clearly and completely. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present invention. Unless otherwise defined, all technical and scientific terms used in this article have the same meaning as those commonly understood by technicians in the technical field of the present invention. The terms used in the specification of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0057] In the description of the embodiments of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, which is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the embodiments of the present invention. In addition, the terms "first" and "second" are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present invention, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0058] Please also see Figures 1 to 4The present embodiment provides an anti-shake device 100, which includes a base 10, a supporting body 20 movably disposed on the base 10, and a driving member 30 for driving the supporting body 20 to move relative to the base 10; the driving member 30 includes a conductive structure 31 disposed on the supporting body 20, a plurality of positive electrode pads 32 disposed on the base 10, and an SMA wire 33 (Shape memory alloy) connecting each of the positive electrode pads 32 and the conductive structure 31. When current flows from the positive electrode pad 32 into the SMA wire 33, the SMA wire 33 is deformed by heat, thereby generating a traction force F on the SMA wire 33 for pulling the conductive structure 31. The conductive structure 31, which is acted upon by the plurality of traction forces F, drives the supporting body 20 to rotate in a plane parallel to the base 10. When the current stops flowing from the positive pad 32 into the SMA wire 33, the SMA wire 33 cools and returns to its original shape, the traction force F disappears, and the supporting body 20 returns to its original position. The direction of each traction force F is set from the connection between the SMA wire 33 and the conductive structure 31 to the corresponding positive pad 32.

[0059] In this embodiment, the SMA wire 33 is a shape memory alloy with shape memory effect formed by two or more metal elements through thermoelasticity and martensitic phase transformation and its inversion. At the same time, the SMA wire 33 also has resistance properties. When current passes through the SMA wire 33, the SMA wire 33 is heated and deformed. When no current passes through the SMA wire 33, the SMA wire 33 cools and returns to its original shape, and there is a linear relationship between the resistance value and length of the SMA wire 33.

[0060] In actual application, the fixed focus lens 201 of the mobile phone camera (in Figure 6The SMA wire 33 is provided on the supporting body 20 of the anti-shake device 100. When the fixed-focus lens 201 is subjected to an external force (the external force may be generated by shaking, etc.), the fixed-focus lens 201 will drive the supporting body 20 to rotate in one direction along a plane parallel to the base 10. At this time, the driving member 30 of the anti-shake device 100 can drive the supporting body 20 to rotate in the opposite direction along a plane parallel to the base 10, thereby compensating for the rotation of the fixed-focus lens 201 and achieving the purpose of preventing shaking. Furthermore, there is a predetermined linear relationship between the resistance value and the length of the SMA wire 33. The anti-shake device 100 may pre-store the original length of the SMA wire 33. When the fixed-focus lens 201 rotates, the anti-shake device 100 first calculates the theoretical length of the SMA wire 33 that can compensate for the rotation of the fixed-focus lens 201, and calculates the change in the resistance value of the SMA wire 33 according to the difference between the theoretical length and the original length and the linear relationship, and calculates the corresponding current value according to the change in the resistance value. When the current is input to the SMA wire 33 according to the current value, the rotation of the fixed-focus lens 201 can be just compensated.

[0061] In this embodiment, the conductive structure 31 and the base 10 are in a square frame shape, the conductive structure 31 includes four first vertices 311, the base 10 includes four second vertices 101 opposite to the first vertices 311, and the number of the SMA wires 33 is four. One end of each of the SMA wires 33 is connected to the vicinity of one of the first vertices 311 of the conductive structure 31, and the other end is connected to the vicinity of one of the second vertices 101 of the base 10, and the first vertices 311 and the second vertices 101 connected to the same SMA wire 33 are staggered, so that the conductive structure 31 can be subjected to the traction force F from the SMA wire 33 in multiple directions and can rotate in a plane under the action of the traction force F.

[0062] In actual operation, when the fixed focus lens 201 rotates counterclockwise, see Figure 4 Current is passed through the two opposite SMA wires 33, so that the conductive structure 31 is subjected to a clockwise torque, which can cause the conductive structure 31 to move in the clockwise direction, thereby correcting the movement of the fixed-focus lens 201 in the clockwise direction.

[0063] In this embodiment, the driving member 30 also includes a negative electrode pad 35 provided on the base 10 and a conductive wire 36 connecting the conductive structure 31 and the negative electrode pad 35. The current input from the positive electrode pad 32 flows into the conductive structure 31 via the SMA wire 33, then flows into the conductive wire 36 from the conductive structure 31, and finally merges into the negative electrode pad 35 from the conductive wire 36, so that each of the SMA wires 33 is arranged in parallel between the positive electrode pad 32 and the negative electrode pad 35, so that each of the SMA wires 33 can generate different traction forces F through currents of different sizes, thereby driving the conductive structure 31 and the supporting body 20 to move.

[0064] In this embodiment, the base 10 includes a base body 102 and a plurality of protrusions 12 extending from a surface of the base body 102 away from the supporting body 20, and the four second vertices 101 are located on the base body 102. The positive pad 32 and the negative pad 35 are formed on the surface of the protrusion 12.

[0065] In this embodiment, a plurality of wire grooves 13 are disposed between the second vertex 101 and the protrusion 12 . Conductive circuits 131 are disposed in the wire grooves 13 . The conductive circuits 131 are used to electrically connect the positive pad 32 and the SMA wire 33 , and the negative pad 35 and the conductive wire 36 .

[0066] In this embodiment, the base 10 , the protrusion 12 and the supporting body 20 are made of polyamide, polycarbonate, polyester, liquid crystal polymer and the like.

[0067] In this embodiment, the conductive structure 31 is formed on the side of the supporting body 20 away from the base 10 by LDS (Laser Direct Structuring) technology, and the conductive circuit 131 is formed on the side of the base 10 and the protrusion 12 close to the supporting body 20 by LDS technology.

[0068] See also Figure 2 , Figure 3 and Figure 4In this embodiment, the base body 102 protrudes toward one side of the supporting body 20 at each second vertex 101 to form a supporting portion 111, and the supporting portion 111 is provided with a first hollowed-out area 112. The supporting body 20 is provided with a second hollowed-out area 113 in the area corresponding to and near the first hollowed-out area 112. A ball 40 is partially received in the first hollowed-out area 112 in a rollable manner, and another part of the ball 40 is received in the second hollowed-out area 113. The ball 40 is used to support the supporting body 20 and realize the movable connection between the supporting body 20 and the base 10. When the supporting body 20 rotates relative to the base 10, the ball 40 can roll relative to the supporting body 20 in the second hollowed-out area 113, so that the supporting body 20 can move smoothly relative to the base 10. It can be understood that a small gap may be provided between the inner side wall of the second hollow area 113 and the ball 40 so that the supporting body 20 can rotate.

[0069] Please also see Figure 1 , Figure 2 , Figure 3 and Figure 5 In this embodiment, the anti-shake device 100 further includes a housing 50, which is sleeved on the outer sides of the supporting body 20 and the base 10. A plurality of elastic members 22 are provided on the outer side of the supporting body 20, and the elastic members 22 abut against the inner side of the housing 50. The elastic members 22 are used to restore the supporting body 20 to its original position. For example, when the current stops flowing from the positive pad 32 into the SMA wire 33, the SMA wire 33 cools and recovers, the traction force F disappears, and the elastic members 22 restore the supporting body 20 to its original position.

[0070] In this embodiment, the anti-shake device 100 further includes a cover 60 . The cover 60 is connected to the supporting body 20 and covers the housing 50 . The cover 60 is used to connect to the fixed-focus lens 201 .

[0071] See also Figure 6The embodiment of the present invention further provides a camera module 200, which includes a fixed-focus lens 201, an anti-shake device 100, a filter (not shown), a lens holder 203, a photosensitive chip (not shown) and a circuit board 205 connected in sequence. The fixed-focus lens 201 is fixed to the cover 60 of the anti-shake device 100 through a glue layer 206, and the circuit board 205 is electrically connected to the positive pad 32 and the negative pad 35 of the anti-shake device 100. The circuit board 205 also includes a position sensor (not shown), which is used to sense the state of the camera module 200 (such as movement speed, acceleration) and process the state information into the magnitude of the current passing through each of the SMA wires 33.

[0072] See also Figure 7 An embodiment of the present invention further provides an electronic device 300, which includes the camera module 200 as described above. The electronic device 300 can be any device with a camera function, such as a mobile phone, a tablet computer, a laptop computer, a personal digital assistant, a mobile Internet device or a wearable device.

[0073] The anti-shake device provided by the present invention uses the deformation of the SMA wire to realize the movement of the traction support body and realize the shake compensation, which is beneficial to improving the imaging quality of the fixed-focus lens.

[0074] In addition, those skilled in the art should recognize that the above embodiments are only used to illustrate the present invention and are not intended to limit the present invention. As long as they are within the spirit of the present invention, appropriate changes and modifications to the above embodiments are within the scope of protection claimed by the present invention.

Claims

1. An anti-shake device, characterized in that: The invention comprises a base, a supporting body movably arranged on the base, and a driving member driving the supporting body to move relative to the base, wherein the driving member comprises a conductive structure arranged on the supporting body, a plurality of positive electrode pads arranged on the base, and an SMA wire connecting each of the positive electrode pads and the conductive structure. When current flows from the positive electrode pad into the SMA wire, the SMA wire is deformed by heat, thereby generating a traction force F on the SMA wire for pulling the conductive structure. Under the joint action of the plurality of traction forces F, the conductive structure drives the supporting body to rotate in a plane parallel to the base. When the current stops flowing into the SMA wire, the SMA wire cools and returns to its original shape, so that the traction force F disappears and the supporting body returns to its original position. The conductive structure includes four first vertices, the base includes four second vertices opposite to the first vertices, the number of the SMA wires is four, one end of each of the SMA wires is connected to one of the first vertices of the conductive structure, and the other end is connected to one of the second vertices of the base, and the first vertex and the second vertex connected to the same SMA wire are staggered, and two adjacent SMA wires do not share the same vertex, and the vertices include the first vertex and the second vertex.

2. The anti-shake device according to claim 1, characterized in that: The driving component also includes a negative pad arranged on the base and a conductive wire connecting the conductive structure and the negative pad, so that the current flowing in from the positive pad flows into the conductive structure through the SMA wire, then flows into the conductive wire from the conductive structure, and then flows into the negative pad from the conductive wire.

3. The anti-shake device according to claim 2, characterized in that: The base includes a base body and a plurality of protrusions extending from a surface of the base body away from the supporting body. The second vertex is located at the base body, and the positive pad and the negative pad are formed on the surface of the protrusion.

4. The anti-shake device according to claim 3, characterized in that: A plurality of wire grooves are provided between the first vertex and the protrusion, and conductive circuits are provided in the wire grooves. The conductive circuits are used to electrically connect the positive electrode pad and the SMA wire, and the negative electrode pad and the conductive wire.

5. The anti-shake device according to claim 4, characterized in that: The conductive structure and the conductive line are formed by LDS technology.

6. The anti-shake device according to claim 1, characterized in that: The base body protrudes toward one side of the supporting body at the position of each of the second vertices to form a supporting portion, the supporting portion is provided with a first hollowed-out area, the supporting body is provided with a second hollowed-out area in an area corresponding to and adjacent to the first hollowed-out area, a part of a ball can be rollably accommodated in the first hollowed-out area, and another part of the ball can be rollably accommodated in the second hollowed-out area.

7. The anti-shake device according to claim 1, characterized in that: The anti-shake device also includes a shell, which is sleeved on the outside of the supporting body and the base. A plurality of elastic members are provided on the outside of the supporting body, and the elastic members abut against the inner side of the shell. The elastic members are used to restore the supporting body to its original position.

8. The anti-shake device according to claim 1, characterized in that: The base and the supporting body are made of a material selected from the group consisting of polyamide, polycarbonate, polyester and liquid crystal polymer.

9. A camera module, characterized in that: The invention comprises an anti-shake device as claimed in any one of claims 1 to 8.

10. An electronic device, characterized in that: Comprising the camera module as claimed in claim 9.

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