Lens driving assembly

Abstract

The present invention discloses a lens driving assembly, which includes a lens driving device, a motor module, and a shape memory alloy driving device. The lens driving device is used to mount a lens and drive the lens to move. The motor module is disposed at the bottom of the lens driving device and supplies power to the lens driving device. The shape memory alloy driving device is disposed at the bottom of the motor module and drives the motor module to move. By driving the lens to move through the lens driving device and driving the motor module to move through the shape memory alloy driving device, the present invention can achieve a better anti-shake effect and obtain higher imaging quality.

Description

Technical Field

[0001] The present invention relates to the field of optics, and particularly to a lens driving assembly. Background Art

[0002] With the development of technology, many current electronic devices (such as smart phones or digital cameras) have functions of taking pictures or videos. The use of these electronic devices is becoming more and more common, and they are developing towards a convenient, thin and light design direction to provide users with more choices. However, during the current mobile phone shooting process, sometimes the taken pictures are blurry, that is, the captured images are not clear enough, and even double images or blurring occur. These reasons, in addition to occasional out-of-focus (that is, the camera fails to focus normally), are largely due to the slight jitter during the exposure of the photographed scene.

[0003] Generally speaking, this kind of slight jitter phenomenon often occurs under handheld conditions, which will cause the deviation of the lens of the imaging device, resulting in the deterioration of the image quality captured by the image sensor. Therefore, in recent years, the demand for the development of anti-shake technology functions is relatively large.

[0004] However, most of the existing technologies achieve optical zoom and optical anti-shake functions through the movement of the same component (carrier). The movement range of the carrier is limited by weight, volume, etc., and it is impossible to effectively solve the problem of blurry photos caused by hand jitter during the shooting process. Summary of the Invention

[0005] The purpose of the present invention is to provide a lens driving assembly to solve the problems existing in the above-mentioned prior art.

[0006] To solve the above problems, according to one aspect of the present invention, a lens driving assembly is provided. The lens driving assembly includes a lens driving device, a motor module, and a shape memory alloy driving device. The lens driving device is used to mount a lens and drive the lens to move. The motor module is disposed at the bottom of the lens driving device and supplies power to the lens driving device. The shape memory alloy driving device is disposed at the bottom of the motor module and drives the motor module to move.

[0007] In one embodiment, the shape memory alloy driving device includes a circuit board, a movable member, and a shape memory alloy wire. The movable member includes an outer frame and an inner plate. The outer frame and the inner plate are movably connected by an elastic member. The outer frame is connected to the motor module and is provided with an upper wire clamp. The circuit board is connected to the inner plate and is provided with a lower wire clamp. The two ends of the shape memory alloy wire are respectively fixed to the upper wire clamp and the lower wire clamp.

[0008] In one embodiment, the shape memory alloy driving device further includes a bracket and a base plate. The bottom end of the bracket is connected to the upper surface of the base plate to enclose an activity space, and the circuit board, the movable member, and the shape memory alloy wires are arranged in the activity space.

[0009] In one embodiment, the outer frame is provided with four upper wire clips, and the four upper wire clips are arranged along one diagonal direction of the outer frame. The circuit board is provided with four lower wire clips, and the four lower wire clips are arranged along the other diagonal direction of the outer frame. The four upper wire clips and the four lower wire clips are connected by four shape memory alloy wires.

[0010] In one embodiment, the circuit board is provided with four independent input pins and one output pin. The four input pins are respectively connected to the four lower wire clips, and the one output pin is connected to an output mounting plate provided in the middle of the circuit board.

[0011] In one embodiment, the four independent output pins are arranged in pairs on both sides of the one output pin.

[0012] In one embodiment, the shape memory alloy driving device further includes an insulating board, and the insulating board is arranged in the activity space and is disposed below the circuit board.

[0013] In one embodiment, the shape memory alloy driving device further includes a lower backing plate, and the lower backing plate is disposed in the activity space and is arranged between the inner plate of the movable member and the output mounting plate of the circuit board to connect the movable member and the circuit board.

[0014] In one embodiment, the shape memory alloy driving device further includes an upper cushion frame, and the upper cushion frame is disposed in the activity space and is arranged between the movable member and the motor module. Wherein, the outer frame of the movable member is connected to the bottom end of the upper cushion frame, and the top end of the upper cushion frame is connected to the motor module.

[0015] In one embodiment, the motor driving device includes a carrier and a driving mechanism. The carrier is used for mounting a lens, and the driving mechanism drives the carrier to move along the optical axis direction to achieve optical zoom and drives the carrier to move in a plane perpendicular to the optical axis to achieve optical image stabilization.

[0016] The present invention drives the lens to move through the lens driving device, drives the motor module and the imaging chip to move through the shape memory alloy driving device. Thus, through the combination of the movement of the chip and the movement of the lens, a better anti-shake effect can be achieved, and higher imaging quality can be obtained. Description of the Drawings

[0017] Figure 1It is an exploded perspective view of a lens driving assembly according to an embodiment of the present invention.

[0018] Figure 2 It is an exploded perspective view of a shape memory alloy driving device according to an embodiment of the present invention.

[0019] Figure 3 It is a perspective view of a shape memory alloy driving device according to an embodiment of the present invention. Detailed implementation manners

[0020] The following will describe the preferred embodiments of the present invention in detail with reference to the accompanying drawings so as to more clearly understand the purpose, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not limitations on the scope of the present invention, but only illustrate the essential spirit of the technical solution of the present invention.

[0021] In the following description, for the purpose of explaining various disclosed embodiments, certain specific details are set forth to provide a thorough understanding of the various disclosed embodiments. However, those skilled in the relevant art will recognize that the embodiments may be practiced without one or more of these specific details. In other instances, well-known devices, structures and techniques associated with the present application may not be shown or described in detail so as not to unnecessarily obscure the description of the embodiments.

[0022] References to "an embodiment" or "one embodiment" in the entire specification mean that the particular features, structures or characteristics described in connection with the embodiment are included in at least one embodiment. Thus, the appearances of "in an embodiment" or "in one embodiment" in various places throughout the specification are not necessarily all referring to the same embodiment. Additionally, the particular features, structures or characteristics may be combined in any manner in one or more embodiments.

[0023] In the following description, in order to clearly show the structure and working mode of the present invention, many directional terms will be used for description. However, words such as "front", "rear", "left", "right", "outer", "inner", "outward", "inward", "up", "down", etc. should be understood as convenient terms and should not be understood as restrictive terms.

[0024] The present application generally relates to a lens driving assembly, which can be used in terminal products such as mobile phones, tablet computers, etc. to cooperate with a lens to achieve functions such as taking pictures and videos.

[0025] Figure 1 It is an exploded perspective view of a lens driving assembly 100 according to an embodiment of the present invention. As Figure 1As shown, the lens driving assembly 100 generally includes a lens driving device 10, a motor module 20, and a shape memory alloy driving device 30. The motor module 20 is disposed below the lens driving device 10 and supplies power to the lens driving device 10. The shape memory alloy driving device 30 is disposed below the motor module 20 and drives the motor module 20 to move.

[0026] The lens driving device 10 can be a common OIS motor, which generally includes a housing, a carrier, a base, a frame, a magnet, and a coil. The carrier is used to mount the lens and is usually wound with a driving coil. The magnet is disposed on the housing or the frame. The base is usually provided with an anti-shake coil. The carrier is driven to move along the optical axis direction through the cooperation of the magnet and the driving coil to realize the optical zoom function, and the carrier is driven to move on a plane perpendicular to the optical axis through the cooperation of the magnet and the anti-shake coil to realize the optical anti-shake function.

[0027] In the present invention, the lens is driven to move by the lens driving device, and the motor module and the imaging chip are driven by the shape memory alloy driving device, so that a better anti-shake effect can be achieved through the combination of the chip movement and the lens movement, and higher imaging quality can be obtained.

[0028] Figure 2 is an exploded perspective view of the shape memory alloy driving device 30 according to an embodiment of the present invention. As Figure 2 shown, in one embodiment, the shape memory alloy driving device 30 includes a circuit board 31, a movable member 32, and a shape memory alloy wire 33. The movable member 32 includes an outer frame 321 and an inner plate 322. The outer frame 321 and the inner plate 322 are connected by an elastic member 323. The outer frame 321 is connected to the motor module 20 and is provided with an upper wire clip 324. The circuit board 31 is connected to the inner plate 322 and is provided with a lower wire clip 311. The two ends of the shape memory alloy wire 33 are respectively fixedly connected to the upper wire clip 324 and the lower wire clip 311.

[0029] Optionally, the circuit board 31 is a flexible printed circuit (FPC). Optionally, the elastic member 323 is a spring wire.

[0030] In one embodiment, the shape memory alloy driving device 30 further includes a bracket 34 and a bottom plate 35. The bottom end of the bracket 34 is connected to the upper surface of the bottom plate 35 to enclose a movable space 36. The circuit board 31, the movable member 32, and the shape memory alloy wire 33 are disposed in the movable space 36. The motor module 20 is placed on the bracket 34 and is located above the movable space 36. Thus, components such as the circuit board 31, the movable member 32, and the shape memory alloy wire 33 are incorporated into the movable space 36 to play a protective role. It should be noted that the movable space 36 is formed by enclosing a region of the bracket 34 and the bottom plate 35, and its lower end is closed and the upper end is open to install various components.

[0031] Optionally, the outer frame 321 is provided with four upper wire clamps 324, and the four upper wire clamps 324 are arranged along one diagonal direction of the outer frame 321. The circuit board 31 is provided with four lower wire clamps 311, and the four lower wire clamps 311 are arranged along the other diagonal direction of the outer frame 321. Four shape memory alloy wires 31 are connected between the four upper wire clamps 324 and the four lower wire clamps 311.

[0032] One end of each shape memory alloy wire 33 is connected to the upper wire clamp 324, and the other end is connected to the lower wire clamp 311. The four shape memory alloy wires 33 are arranged around the outer frame 321 to form a substantially rectangular shape. After the shape memory alloy wires 33 are energized, they contract and deform, pulling the upper wire clamps 324 and the outer frame to move, thereby driving the motor module 20 to move. When the shape memory alloy wires are de-energized and return to their original state, the outer frame returns to its original state under the action of the elastic member 323 and drives the motor module 20 back to its original position.

[0033] It should be noted that the concept of the diagonal of the outer frame 321 is introduced in this article for the convenience of description and is not intended to represent a physical line of the outer frame 321.

[0034] In one embodiment, an output mounting plate 314 is formed in the middle of the circuit board 31, and four independent input pins 312 and one output pin 313 are provided. The four input pins 312 are respectively connected to the four lower wire clamps 311, and one output pin 313 is connected to the output mounting plate 314.

[0035] Optionally, the four independent input pins 312 are arranged in pairs on both sides of one output pin 313. The input pin 313 is used to connect an external current to introduce the current, and the output pin 313 is used to connect to the lower wire clamp 311 and transfer the current to the shape memory alloy wires 33. When power is supplied to the input pin 313, the current forms a closed circuit in sequence through the input pin 312, the lower wire clamp 311, the shape memory alloy wires 33, the upper wire clamp 324, the elastic member 323, the inner plate 322, the output mounting plate 314, and the output pin 313. After the shape memory alloy wires 33 are energized, they contract and deform, pulling the upper wire clamps 324 and the outer frame 321 to move, thereby driving the motor module 20 to move. When the input pin 312 is de-energized, the shape memory alloy wires 33 return to their original state, and the outer frame 321 returns to its original state under the action of the elastic member 323 and drives the motor module 20 back to its position.

[0036] As Figure 2 shown, in one embodiment, the shape memory alloy driving device 30 further includes an insulating plate 37, and the insulating plate 37 is disposed in the moving space 36 and arranged below the circuit board 31. The insulating plate 37 is connected to the middle of the upper surface of the bottom plate 35, the circuit board 31 is disposed above the insulating plate 37, and the movable member 32 is disposed above the circuit board 31 and connected by the shape memory alloy wires 33.

[0037] In one embodiment, the shape memory alloy driving device 30 further includes a lower backing plate 38. The lower backing plate 38 is disposed in the moving space 36 and arranged between the inner plate 322 of the movable member 32 and the output mounting plate 315 of the circuit board 31 to connect the movable member 32 and the circuit board 31. Thus, the middle part of the movable member 33 is connected to the circuit board 31 through the lower backing plate 38.

[0038] Optionally, the output mounting plate 314 of the circuit board 31 and the inner plate 322 of the movable member 32 have matching shapes and dimensions, and the lower backing plate 38 has shapes and dimensions matching those of the output mounting plate 314 of the circuit board 31 and the inner plate 322 of the movable member 32. Thus, the output mounting plate 314 of the circuit board 31 and the inner plate 322 of the movable member 32 can be conveniently connected through the lower backing plate 38.

[0039] In one embodiment, the shape memory alloy driving device 30 further includes an upper cushion frame 39. The upper cushion frame 39 is disposed in the moving space 36 and arranged between the movable member 32 and the motor module 20. Among them, the outer frame 321 of the movable member 32 is connected to the bottom end of the upper cushion frame 39, and the top end of the upper cushion frame 39 is connected to the motor module 20. The edge of the movable member 32 is connected to the bottom end of the upper cushion frame 39, and the top end of the upper cushion frame 39 is connected to the motor module 20.

[0040] Optionally, the upper cushion frame 39 has a shape and dimensions matching those of the outer frame 321 of the movable member 32. Thus, the outer frame 39 of the movable member 32 and the motor module 20 can be conveniently connected through the upper cushion frame 39.

[0041] Figure 3 is a perspective view of the shape memory alloy driving device 30 according to an embodiment of the present invention. As Figures 1-3 shown, when power is supplied to the input pin 312, the current sequentially passes through the input pin 312, the lower wire clip 313, the shape memory alloy wire 33, the upper wire clip 324, the outer frame 321, the elastic member 323, the inner plate 323, the lower backing plate 38, the output mounting plate 314, and the output pin 313 to form a closed circuit. After the shape memory alloy wire 33 is energized, it contracts and deforms, pulling the upper wire clip 324 and the outer frame 321 to move, thereby driving the upper cushion frame 39 and the motor module 20 to move. When the input pin 312 is powered off, the shape memory alloy wire 33 returns to its original state, and the outer frame 321 returns to its original state under the action of the elastic member 323.

[0042] By supplying power to different input pins 312, the energization operation of different shape memory alloy wires 33 is realized, so that the motor module 20 can rotate around the X-axis and Y-axis directions. At the same time, in cooperation with the X-axis, Y-axis, and Z-axis movements of the lens driving device 10, it has a higher anti-shake effect and realizes higher imaging quality.

[0043] The preferred embodiments of the present invention have been described in detail above. However, it should be understood that after reading the above teachings of the present invention, those skilled in the art can make various changes or modifications to the present invention. These equivalent forms also fall within the scope defined by the appended claims of this application.

Claims

1. A lens driving assembly, characterized in that, The lens driving assembly includes a lens driving device, a motor module, and a shape memory alloy driving device. The lens driving device is used to mount a lens and drive the lens to move. The motor module is disposed at the bottom of the lens driving device and supplies power to the lens driving device. The shape memory alloy driving device is disposed at the bottom of the motor module and drives the motor module to move; The shape memory alloy driving device includes a circuit board, a movable member, and shape memory alloy wires. The movable member includes an outer frame and an inner plate. The inner plate is located in the middle of the outer frame, and the outer frame and the inner plate are movably connected by an elastic member. The outer frame is connected to the motor module and is provided with upper wire clips. The circuit board is connected to the inner plate and is provided with lower wire clips. The two ends of the shape memory alloy wires are respectively fixedly connected to the upper wire clips and the lower wire clips; The outer frame is provided with four of the upper wire clips, and the four upper wire clips are arranged along one diagonal direction of the outer frame. The circuit board is provided with four of the lower wire clips, and the four lower wire clips are arranged along the other diagonal direction of the outer frame. The four upper wire clips and the four lower wire clips are connected by four of the shape memory alloy wires; The circuit board is provided with four independent input pins and one output pin. The four input pins are respectively connected to the four lower wire clips, and the one output pin is connected to an output mounting plate disposed in the middle of the circuit board; The four independent input pins are arranged in pairs on both sides of the one output pin; The shape memory alloy driving device further includes a bracket and a bottom plate. The bottom end of the bracket is connected to the upper surface of the bottom plate to enclose a movable space. The circuit board, the movable member, and the shape memory alloy wires are arranged in the movable space; The shape memory alloy driving device further includes a lower backing plate. The lower backing plate is disposed in the movable space and is arranged between the inner plate of the movable member and the output mounting plate of the circuit board to connect the movable member and the circuit board.

2. The lens driving assembly according to claim 1, wherein The shape memory alloy driving device further includes an insulating plate. The insulating plate is arranged in the movable space and is disposed below the circuit board.

3. The lens driving assembly according to claim 1, wherein The shape memory alloy driving device further includes an upper cushion frame. The upper cushion frame is disposed in the movable space and is arranged between the movable member and the motor module. Among them, the outer frame of the movable member is connected to the bottom end of the upper cushion frame, and the top end of the upper cushion frame is connected to the motor module.

4. The lens driving assembly according to claim 1, wherein The lens driving device includes a carrier and a driving mechanism. The carrier is used to mount a lens. The driving mechanism drives the carrier to move along the optical axis direction to achieve optical zoom and drives the carrier to move in a plane perpendicular to the optical axis to achieve optical image stabilization.

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