Optical anti-shake device and camera module

Abstract

The invention provides an optical anti-shake device and a camera module thereof. The optical anti-shake device comprises a mover located on the upper portion; the mechanical reinforcing structure is positioned at the lower part; the electric connection assembly is located between the rotor and the mechanical reinforcing structure, the electric connection assembly comprises a movable part and a fixed part, the movable part is connected with the rotor, and the fixed part is connected with the mechanical reinforcing structure. According to the camera module, the substrate and the electric connection assembly in the optical anti-shake device in the prior art are integrally designed, the module space occupied by the original substrate is saved, the size of the carrier plate serving as a mover can be properly increased, and therefore the design difficulty of control circuit components arranged on the carrier plate is reduced, the overall size of the camera module is reduced, and the size of the camera module is reduced. And miniaturization design is facilitated, or a larger anti-shake stroke can be realized under the same module size, and the imaging quality is improved.

Description

Technical Field

[0001] The present invention relates to the field of image imaging technology, and in particular to an optical anti-shake device and a camera module. Background Art

[0002] When taking photos with a handheld portable smart device, the physiological tremor of the human body is unavoidable and cannot be overcome through training. As a result, the handheld portable smart device will inevitably shake with the human body when taking photos, resulting in a decrease in image quality. The most obvious manifestation is that the image obtained is blurry and unclear.

[0003] Moreover, as consumers' requirements for mobile phone imaging quality increase and the number of photo-taking scenarios increases, more and more consumers will have the need to record or take photos while exercising, which puts higher demands on the anti-shake function of handheld portable smart devices when taking photos and videos.

[0004] The optical image stabilization device of the prior art generally includes a substrate as a stator and a carrier plate as a mover, wherein a photosensitive element is arranged on the carrier plate, and the carrier plate drives the photosensitive element to move relative to the substrate under the action of a driving device to achieve optical image stabilization compensation. An electrical connection assembly (Trace Suspension Assembly, TSA) is also arranged between the substrate and the carrier plate, which is used to provide electrical connection and elastic restoring force for the carrier plate. The electrical connection assembly generally includes an inner bracket, an outer bracket, and a plurality of conductive elastic wires connected between the inner bracket and the outer bracket. The inner bracket is fixed to the carrier plate and electrically connected to the carrier plate, and the outer bracket is fixed to the substrate and electrically connected to the substrate. The substrate is provided with traces and pads for electrical connection with the outside. A mechanical reinforcement structure is arranged under the substrate to enhance the overall strength of the device.

[0005] With the design trend of miniaturization of portable smart devices and consumers' increasing pursuit of image quality, the camera module size requirements for portable smart devices are getting smaller and smaller, and the anti-shake travel requirements are getting larger and larger. The existing optical anti-shake devices cannot meet customer needs. Summary of the invention

[0006] The object of the present invention is to provide an optical image stabilization device and a camera module, which can save module space, reduce the module volume, reduce the difficulty of circuit design, facilitate miniaturization design, and improve imaging quality.

[0007] One aspect of the present invention provides an optical image stabilization device, comprising: a mover located at an upper portion; a mechanical reinforcement structure located at a lower portion; an electrical connection component located between the mover and the mechanical reinforcement structure, the electrical connection component comprising a moving part and a fixed part, the moving part being connected to the mover, and the fixed part being connected to the mechanical reinforcement structure.

[0008] Preferably, the electrical connection components can be made into standard parts through standardized design, and the product cost can be reduced through mass production.

[0009] Preferably, wiring and pads are provided on the fixed part for electrical connection with the outside.

[0010] Preferably, the pad of the fixed part is electrically connected to the outside through an anisotropic conductive film.

[0011] Preferably, the moving part comprises a plurality of conductive elastic wires, and each conductive elastic wire comprises at least one conductive layer and at least one insulating layer.

[0012] Preferably, the mover includes a carrier plate and a photosensitive element arranged on the carrier plate, and the carrier plate drives the photosensitive element to move under the action of a driving device to achieve optical image stabilization compensation.

[0013] Preferably, components of an optical image stabilization control circuit are also provided on the carrier board.

[0014] Preferably, the optical image stabilization device further comprises a limiting device, and the limiting device is used to limit the rotation amplitude and movement range of the carrier plate on the plane where the photosensitive element is located.

[0015] Preferably, the driving device is an SMA driving assembly, and the SMA driving assembly includes an SMA wire arranged around the photosensitive element and claws respectively clamping two ends of the SMA wire, and at least a part of the claws is embedded in the limiting device.

[0016] Another aspect of the present invention provides a camera module, comprising the optical image stabilization device as described above.

[0017] Compared with the prior art, the optical image stabilization device and camera module of the present invention have the following advantages: based on the optical image stabilization device using elastic electrical connections, the substrate and the electrical connection component in the optical image stabilization device of the prior art are integrated into a design, and the electrical connection component is directly arranged between the mover and the mechanical reinforcement structure, the moving part of the electrical connection component is connected to the mover, and the fixed part is connected to the mechanical reinforcement structure, thereby saving the module space occupied by the original substrate, and the size of the carrier board serving as the mover can be appropriately increased, thereby reducing the design difficulty of the control circuit components arranged on the carrier board, reducing the overall volume of the camera module, facilitating miniaturization design, or achieving a larger image stabilization stroke under the same module size, thereby improving imaging quality. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present invention will become more apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings.

[0019] Figure 1 An exploded diagram of the optical image stabilization device of the present invention; Figure 2 is a top view of the optical image stabilization device of the present invention; Figure 3 is a cross-sectional view of the optical image stabilization device of the present invention; Figure 4 FIG. 4 is a schematic diagram of installing the optical image stabilization device of the present invention.

[0020] In the drawings, the same or similar reference numerals denote the same or similar devices (modules) or steps throughout different drawings. Implementation

[0021] Many specific details are set forth in the following description to facilitate a full understanding of the present invention. However, the present invention can be implemented in many other ways than those described herein, and those skilled in the art can make similar generalizations without violating the connotation of the present invention, so the present invention is not limited to the specific implementation disclosed below.

[0022] Secondly, the present invention is described in detail using schematic diagrams. When describing the embodiments of the present invention in detail, for the convenience of explanation, the schematic diagrams are only examples and should not limit the scope of protection of the present invention.

[0023] In order to make the above-mentioned objects, features and advantages of the present invention more obvious and understandable, the method of the present invention is described in detail below with reference to the accompanying drawings.

[0024] The present invention provides an optical image stabilization device, which can realize optical image stabilization compensation of a photosensitive element (e.g., an image sensor assembly). The optical image stabilization device can be used in a camera module or an electronic device. The electronic device can be a device with an image acquisition function such as a mobile phone or a tablet computer.

[0025] The specific structure of the optical image stabilization device of the present invention will be described below with reference to the accompanying drawings.

[0026] Figure 1-Figure 4The structure of an optical image stabilization device according to a preferred embodiment of the present invention is shown, and the optical image stabilization device includes: a mover 116 located at the top; a mechanical reinforcement structure 111 located at the bottom; and an electrical connection component 117 located between the mover 116 and the mechanical reinforcement structure 111. The electrical connection component 117 includes a moving part 109 and a fixed part 110, wherein the moving part 109 is connected to the mover 116, and the fixed part 110 is connected to the mechanical reinforcement structure 111. The mover 116 includes a carrier 108 and a photosensitive element 107 disposed on the carrier 108, and the carrier 108 drives the photosensitive element 107 to move under the action of a driving device to achieve optical image stabilization compensation. The electrical connection component 117 is used to achieve electrical connection between the mover 116 and an external element (such as a circuit board 112), and at the same time provide an elastic restoring force to the mover 116 to drive the mover 116 back to the optical center when it is not in operation, and the optical center coincides with the center of the photosensitive element 107.

[0027] In this embodiment, the photosensitive element 107 is mounted on the carrier 108. In other embodiments not shown, the photosensitive element 107 can also be arranged on the carrier 108 in other ways, such as wire bonding, adhesive bonding, etc.

[0028] In this embodiment, the photosensitive element 107 is located on the surface of the carrier 108 and is fixedly connected to the carrier 108. In other embodiments not shown, an opening or a groove is provided in the middle of the carrier 108, and the photosensitive element 107 is accommodated in the opening or the groove and is fixedly connected to the carrier 108.

[0029] Preferably, the photosensitive element 107 is a CMOS image sensor, a CCD image sensor or other types of image sensors. The photosensitive surface of the photosensitive element 107 is parallel to the X and Y directions and perpendicular to the optical axis Z direction. The photosensitive element 107 moves in the X and Y directions and rotates in the plane under the action of the driving device to perform motion compensation for optical image stabilization.

[0030] Preferably, the mover 116 may further include an IR component 118, which is used to reduce the impact of infrared light in the light incident on the photosensitive element 107. Further preferably, the IR component 118 includes: an IR filter and an IR frame; the IR filter is located above the photosensitive surface of the photosensitive element 107; and the IR frame is suitable for accommodating and supporting the IR filter. Specifically, the IR frame is arranged on the carrier 108 and moves synchronously with the carrier 108.

[0031] In the optical image stabilization device of the present invention, the mechanical reinforcement structure 111 is, for example, a reinforcement plate, which may be made of a metal material with a certain strength, and is used to provide sufficient support for the electrical connection component 117 and the upper cover 101 .

[0032] exist Figure 1 In the illustrated embodiment, the moving part 109 of the electrical connection assembly 117 includes a plurality of conductive elastic wires, each of which includes at least one conductive layer and at least one insulating layer. One end of the conductive elastic wire is connected to the fixed part 110, and the other end is independently connected to the mover 116, or is connected to the mover 116 through a frame connected to each other. Thus, the conductive layer in the conductive elastic wire can electrically connect the mover 116 and the fixed part 110 for signal transmission; and because the conductive elastic wire is elastic, it can produce elastic deformation during the motion compensation of the mover 116, and restore to the initial state after the motion compensation is completed, driving the mover 116 to return to the position of the optical center. When the signal transmission requirements are high, a multi-layer electrical connection structure can also be used, that is, each conductive elastic wire includes multiple conductive layers, which are used to transmit different signals, and an insulating layer is provided between each conductive layer. In addition, the fixed part 110 is provided with a wiring and a pad 113 for electrically connecting to the external circuit board 112; further preferably, the pad 113 of the fixed part 110 is electrically connected to the external circuit board 112 via an anisotropic conductive film (ACF). Preferably, the electrical connection component 117 can be made into a standard part through standardized design, and the product cost can be reduced through mass production.

[0033] The present invention is based on an optical image stabilization device using elastic electrical connections, and integrates the substrate and the electrical connection component in the optical image stabilization device in the prior art into an integrated design. By directly setting the electrical connection component 117 between the mover 116 and the mechanical reinforcement structure 111, the module space occupied by the original substrate is saved, and the size of the carrier 108 in the mover 116 can be appropriately increased, thereby reducing the design difficulty of the control circuit components 119 arranged on the carrier 108, reducing the overall volume of the camera module, and facilitating miniaturization design, or achieving a larger image stabilization stroke under the same module size, thereby improving imaging quality.

[0034] Further preferably, the optical image stabilization device of the present invention further includes an upper cover 101, wherein the upper cover 101 covers the mover 116, and the upper cover 101 has a window area, wherein the window area is located above the photosensitive surface of the photosensitive element 107, and the window area is slightly larger than the IR frame to accommodate the movement of the IR frame therein.

[0035] Further preferably, the optical image stabilization device of the present invention further includes a limit device 114, which is located between the upper cover 101 and the electrical connection component 117, and is used to limit the rotation amplitude and movement range of the carrier 108 on the plane (XY plane) where the photosensitive element 107 is located.

[0036] See also Figure 1-Figure 2 The limiting device 114 includes a first limiting component 102 and a second limiting component 103. The first limiting component 102 is arranged on the carrier 108, and the second limiting component 103 is arranged on the upper cover 101, or on the fixed part 110 of the electrical connection component 117. Therefore, the first limiting component 102 moves with the mover 116, and the second limiting component 103 remains fixed. The first limiting component 102 and the second limiting component 103 cooperate with each other to limit the rotation amplitude and movement range of the mover on the plane where the photosensitive element is located, thereby improving the stability of the product.

[0037] Specifically, the plane where the photosensitive element 107 is located includes an X direction and a Y direction that are perpendicular to each other, and there is an X direction gap set along the X direction and a Y direction gap set along the Y direction between the first limiting component 102 and the second limiting component 103. Preferably, the limiting device 104 is at least arranged on two opposite sides of the plane where the photosensitive element is located in the X direction, on two opposite sides of the plane where the photosensitive element is located in the Y direction, or on one side of the plane where the photosensitive element is located in the adjacent X direction and one side of the Y direction, so as to limit the range of movement of the mover in the X direction, -X direction, +Y direction or -Y direction on the plane where the photosensitive element is located.

[0038] Preferably, the first limiting component 102 is a frame structure arranged around the photosensitive element 107, and the second limiting structure 103 is located on the outer side of the first limiting component away from the photosensitive element 107. In this embodiment, the second limiting structure 103 is arranged on the extension line of the diagonal line of the photosensitive surface; in other embodiments not shown, the second limiting structure 103 can also be arranged at a certain distance from the extension line of the diagonal line of the photosensitive surface. Those skilled in the art can understand that the closer the second limiting structure 103 is to the extension line of the diagonal line of the photosensitive surface, the better its limiting effect.

[0039] In this embodiment, the driving device for driving the mover 116 is an SMA driving component 115, and the SMA driving component 115 includes an SMA wire 106, and the SMA wire 106 is arranged around the photosensitive element 107. The SMA driving component 115 also includes jaws 104 and 105 for clamping the two ends of the SMA wire 106 respectively, and at least part of the jaws 104 and 105 are embedded in the limiting device 114.

[0040] Specifically, the clamp includes a first clamp 105 and a second clamp 104. The cantilever portion of the first clamp 105 is embedded in the first limiting component 102 so that the first end of the SMA wire 106 is connected to the carrier plate 108. The cantilever portion of the second clamp 104 is embedded in the second limiting component 103 so that the second end of the SMA wire 106 is connected to the upper cover 101 serving as the stator or the fixed portion 110 of the electrical connection component 117.

[0041] By embedding at least part of the clamping jaws 104, 105 for clamping the SMA wire 106 into the limiting device 114, the clamping jaws and the limiting device can be installed as a whole, which further reduces the number of assembly components, simplifies the assembly process, reduces the difficulty of assembly, and is conducive to improving assembly efficiency and accuracy, so that accurate limitation of the movement space of the mechanical structure can be achieved.

[0042] In addition, the present invention also provides a camera module, which includes an optical image stabilization device having the above characteristics. The specific structure of the optical image stabilization device can be referred to the description in the above embodiment, and will not be repeated here.

[0043] To summarize, the optical image stabilization device and camera module of the present invention are based on an optical image stabilization device using elastic electrical connections, and the substrate and the electrical connection component in the optical image stabilization device of the prior art are integrated into one design. The electrical connection component is directly arranged between the mover and the mechanical reinforcement structure, and the moving part of the electrical connection component is connected to the mover, and the fixed part is connected to the mechanical reinforcement structure. This saves the module space occupied by the original substrate, and the size of the carrier board serving as the mover can be appropriately increased, thereby reducing the design difficulty of the control circuit components arranged on the carrier board, reducing the overall volume of the camera module, facilitating miniaturization design, or achieving a larger image stabilization stroke under the same module size, thereby improving imaging quality.

[0044] It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above and that the invention can be implemented in other specific forms without departing from the spirit or essential features of the invention. Therefore, in any case, the embodiments should be considered exemplary and non-restrictive. Furthermore, it is apparent that the term "comprising" does not exclude other elements and steps, and the wording "a" does not exclude the plural. Multiple elements stated in a device claim may also be implemented by one element. The words first, second, etc. are used to indicate names and do not indicate any particular order.

Claims

1. An optical image stabilization device, characterized in that: include: The mover located above; A mechanical reinforcement structure located underneath; An electrical connection component is located between the mover and the mechanical reinforcement structure, wherein the electrical connection component includes a moving part and a fixed part, the moving part is connected to the mover, and the fixed part is connected to the mechanical reinforcement structure.

2. The optical image stabilization device according to claim 1, wherein: The electrical connection components can be made into standard parts through standardized design, and the product cost can be reduced through mass production.

3. The optical image stabilization device according to claim 2, wherein: The fixed part is provided with wiring and pads for electrical connection with the outside.

4. The optical image stabilization device according to claim 3, wherein: The pad of the fixed part is electrically connected to the outside through the anisotropic conductive film.

5. The optical image stabilization device according to claim 1, wherein: The moving part includes a plurality of conductive elastic wires, each of which includes at least one conductive layer and at least one insulating layer.

6. The optical image stabilization device according to claim 1, wherein: The mover includes a carrier plate and a photosensitive element arranged on the carrier plate. The carrier plate drives the photosensitive element to move under the action of a driving device to achieve optical image stabilization compensation.

7. The optical image stabilization device according to claim 6, wherein: The carrier board is also provided with components of an optical image stabilization control circuit.

8. The optical image stabilization device according to claim 6, wherein: It also includes a limiting device, which is used to limit the rotation amplitude and movement range of the carrier plate on the plane where the photosensitive element is located.

9. The optical image stabilization device according to claim 8, wherein: The driving device is an SMA driving assembly, which includes an SMA wire arranged around the photosensitive element and clamps respectively clamping two ends of the SMA wire, and at least a part of the clamps is embedded in the limiting device.

10. A camera module, characterized in that: The optical image stabilization device comprises the optical image stabilization device as claimed in any one of claims 1 to 9.

Images