Driving mechanism and lens anti-shake device

Abstract

The present invention relates to a driving mechanism and a lens anti-shake device. The driving mechanism comprises a driving rod and an SMA wire. The driving rod is provided with a power input end, a power output end and a transfer part. The distance from the power input end to the transfer part is smaller than the distance from the power output end to the transfer part. The transfer part provides a fulcrum for the synchronous rotation of the power input end and the power output end. One end of the SMA wire is connected to the power input end of the driving rod, and the other end is fixedly arranged. The SMA wire provides an actuating force to drive the power input end of the driving rod to rotate, so that the power output end synchronously follows the rotation and amplifies the rotation arc length. In the lens anti-shake device, the power output end is used to act on the lens carrier, so that the lens carrier rotates around the optical axis of the lens, so as to realize the function of optical anti-shake and improve the use performance of the lens. The driving mechanism of the present invention is small in size and simplifies the driving structure, so as to meet the requirements of product miniaturization. Through the principle of lever, anti-shake of a large stroke is realized, and the control is simple and accurate, which is suitable for popularization and utilization.

Description

Technical Field

[0001] The present invention relates to the technical field of drive mechanisms, in particular to a drive mechanism for lens anti-shake. Background Art

[0002] With the advancement of science and technology, the application of camera modules is becoming more and more extensive. At present, in addition to cameras, mobile phones, computers and other electronic devices are equipped with camera modules to facilitate people to take pictures anytime and anywhere, bringing convenience and fun to people's lives. Camera modules include fixed focal length (FF) camera modules and auto focus (AF) camera modules. In the auto focus (AF) camera module, the lens can be driven to move by a lens drive device (motor) to achieve focus. When taking pictures or videos, the lens cannot remain absolutely stable due to human shaking or other reasons, resulting in a certain offset. At this time, the focus and light intake of the camera will be affected, thereby affecting the quality of the image obtained by the camera. Generally, this lens deflection occurs in the direction perpendicular to the optical axis, and the auto focus motor can only drive the lens to move in the direction of the optical axis, so it cannot solve the problem caused by this type of lens deflection. To this end, an optical anti-shake actuator is added to the auto focus motor to drive the lens to move in two directions perpendicular to the optical axis, which can compensate for the above-mentioned deflection of the lens and help the camera obtain better image quality. A common optical image stabilization actuator is a miniature voice coil motor, which generates Lorentz magnetic force in a magnetic field by an energized coil to drive the lens to move. To achieve optical image stabilization, the lens needs to be driven in at least two directions, which means that multiple coils need to be arranged, which brings certain challenges to the miniaturization of the overall structure. In addition, the miniature voice coil motor not only has a complex structure and a large size, but also has a small optical image stabilization stroke, which is difficult to meet the needs and reduces the effectiveness of the image stabilization. Summary of the invention

[0003] The purpose of the present invention is to provide a driving mechanism, which is particularly suitable for constructing a lens anti-shake device, realizing automatic camera anti-shake, and meeting the requirements of product miniaturization.

[0004] In order to achieve the above object, the driving mechanism proposed in the present invention has:

[0005] A driving rod, the driving rod is provided with a power input end, a power output end and a transfer part located between the power input end and the power output end, wherein the distance from the power input end to the transfer part is smaller than the distance from the power output end to the transfer part; the transfer part provides a fulcrum for the synchronous rotation of the power input end and the power output end;

[0006] An SMA wire, one end of which is connected to the power input end of the driving rod, and the other end of the SMA wire is fixedly arranged. The SMA wire provides an actuating force to drive the power input end of the driving rod to rotate, so that the power output end synchronously follows the rotation and amplifies the rotation arc length.

[0007] The above scheme is further that the power input end and the power output end rotate on the same plane, and an outwardly extending elastic arm is provided on one side of the transfer part, the outwardly extending end of the elastic arm is fixed, and the elastic arm is used for rotational resetting of the power input end and the power output end.

[0008] In order to achieve the above-mentioned object, the lens anti-shake device proposed in the present invention has:

[0009] Support base,

[0010] A lens carrier, the lens carrier being supported on a supporting base by a suspension system;

[0011] A driving rod, the driving rod is provided with a power input end, a power output end and a transfer part located between the power input end and the power output end, wherein the distance from the power input end to the transfer part is smaller than the distance from the power output end to the transfer part; the transfer part is hinged on the support base to provide a fulcrum for the synchronous rotation of the power input end and the power output end;

[0012] An SMA wire, one end of which is connected to the power input end of the driving rod, and the other end of the SMA wire is fixedly connected to the supporting base. The SMA wire provides an actuating force to drive the power input end of the driving rod to rotate, so that the power output end synchronously follows the rotation and amplifies the rotation arc length. The power output end acts on the lens carrier to cause the lens carrier to rotate around the optical axis of the lens.

[0013] The above scheme is further that the driving rod is embedded between the supporting base and the lens carrier, the power input end and the power output end of the driving rod rotate on the same plane built by the supporting base, and an outwardly extending elastic arm is provided on one side of the transfer part, the outwardly extending end of the elastic arm is fixed on the supporting base, and the elastic arm is used for rotational resetting of the power input end and the power output end.

[0014] The above scheme is further that the support base has a bearing surface facing the lens carrier and an optical through hole located in the middle of the bearing surface, four driving rods and four SMA wires are arranged on the bearing surface, the driving rods and the SMA wires are paired and arranged around the optical through hole and all the driving rods are enclosed to form a movable quadrilateral, the driving rods on opposite sides are driven to rotate in the same direction on the bearing surface through the corresponding SMA wires, and the power output end of the driving rod moves away from the center of the optical through hole on the bearing surface.

[0015] The above scheme is further that a toggle portion is provided on the power output end of the driving rod, and the toggle portion protrudes relative to the bearing surface toward the direction of the lens carrier, and a toggle matching groove is provided on the lens carrier, so that the toggle portion is inserted into the toggle matching groove to drive the lens carrier to rotate around the lens optical axis.

[0016] The above scheme is further that a supporting boss is provided on the bearing surface of the supporting base, and the supporting boss receives the transfer part of the driving rod, and the preset pin shaft of the supporting boss is inserted into the positioning hole provided in the transfer part to form a fulcrum for rotation; the number of the supporting bosses is consistent with the number of driving rods, and the receiving height of all the supporting bosses is consistent, so that the driving rods are erected at the same height, and an assembly avoidance space is obtained on the lower side of the driving rod; the SMA line is arranged along the active quadrilateral enclosed by the driving rod, and the SMA line is located in the assembly avoidance space on the lower side of the driving rod.

[0017] The above solution is further characterized in that the elastic arms of the four driving rods are connected together in groups through the extended ends and fixed on the supporting base.

[0018] The present invention utilizes the characteristic of SMA (Shape Memory Alloys) wire shrinking when heated to make a driving mechanism, and realizes anti-shake with a large stroke through the principle of lever, and is used to make a lens anti-shake device, which can adjust the movement of the lens in the direction perpendicular to the optical axis, thereby realizing the OIS (optical image stabilization) function by adjusting the lens inclination angle, and improving the performance of the lens. The SMA wire is small in size and effectively simplifies the driving structure, so that the product miniaturization requirements are met, the product structure is lightweight and miniaturized, and the manufacturing cost is reduced. At the same time, the control is simple and accurate, and it is suitable for promotion and utilization. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Attached Figure 1 It is a structural schematic diagram of a preferred embodiment of the present invention;

[0020] Attached Figure 2 for Figure 1 A schematic diagram of a partial structural decomposition of an embodiment;

[0021] Attached Figure 3 for Figure 1 A schematic diagram of the assembly structure on the support base of the embodiment;

[0022] Attached Figure 4 for Figure 1 A schematic diagram of the paired assembly structure of the driving rod and the SMA wire of the embodiment;

[0023] Attached Figure 5 for Figure 1 Schematic diagram of the lens carrier structure of an embodiment. DETAILED DESCRIPTION

[0024] The concept, specific structure and technical effects of the present invention will be further described below in conjunction with the accompanying drawings to fully understand the purpose, characteristics and effects of the present invention.

[0025] It should be noted that, in the description of the present invention, terms such as "up", "down", "left", "right", "vertical", "horizontal", "inside" and "outside" indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings. This is merely for the convenience of description and does not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, it cannot be understood as a limitation on the present invention.

[0026] See also Figure 2 , 3 4 is a schematic diagram of a driving mechanism proposed by the present invention, which has a driving rod 1 and an SMA wire 2. The driving rod 1 is provided with a power input end 11, a power output end 12, and a transfer portion 13 located between the power input end 11 and the power output end 12. The distance from the power input end 11 to the transfer portion 13 is smaller than the distance from the power output end 12 to the transfer portion 13; the transfer portion 13 provides a fulcrum for the synchronous rotation of the power input end 11 and the power output end 12. One end of the SMA wire 2 is connected to the power input end 11 of the driving rod 1, and the other end of the SMA wire 2 is fixedly arranged. The SMA wire 2 provides an actuating force to drive the power input end 11 of the driving rod 1 to rotate, so that the power output end 12 synchronously follows the rotation and amplifies the rotation arc length, that is, the arc length of the power output end 12 rotation is greater than the power input end 11 rotation, thereby achieving a large stroke anti-shake movement. The SMA (Shape Memory Alloys) wire shrinks when heated and is used to make the drive mechanism. Through the lever principle, anti-shake for a larger stroke is achieved. The SMA wire is small in size and effectively simplifies the drive structure, meeting the requirements for product miniaturization.

[0027] In this embodiment, the power input end 11 and the power output end 12 rotate on the same plane, and an outwardly extending elastic arm 14 is provided on one side of the transfer part 13. The outwardly extending end of the elastic arm 14 is fixed, and the elastic arm 14 is used for the rotation and reset of the power input end 11 and the power output end 12. The elastic arm 14 is made of an integrated structure, which has a simple structure, is convenient for production and assembly, and conforms to the design concept of product miniaturization. The power input end 11 and the power output end 12 rotate on the same plane, which optimizes the assembly space, is conducive to the production of a lens anti-shake device, and can adjust the movement of the lens in the direction perpendicular to the optical axis.

[0028] See also Figure 1 , 2, 3, 4, and 5 show a lens anti-shake device proposed by the present invention, which comprises a support base 3, a lens carrier 4, a driving rod 1, and an SMA wire 2. The support base 3 provides assembly support and a corresponding control circuit system, and its shape is determined according to actual needs. The lens carrier 4 is supported on the support base 3 by a suspension system (not shown in the figure), and the suspension system guides the lens carrier 4 to move relative to the support base 3. The specific suspension system is the prior art, such as a spring body suspension, etc., which can ensure support and guide movement, and is not limited here. The driving rod 1 is provided with a power input end 11, a power output end 12, and a transfer part 13 located between the power input end 11 and the power output end 12, wherein the distance from the power input end 11 to the transfer part 13 is less than the distance from the power output end 12 to the transfer part 13; the transfer part 13 is hinged on the support base 3 to provide a fulcrum for the synchronous rotation of the power input end 11 and the power output end 12. One end of the SMA wire 2 is connected to the power input end 11 of the driving rod 1, and the other end of the SMA wire 2 is fixedly connected to the support base 3. In the figure, the SMA wire 2 is fixed to the support base 3 through the conductive terminal 5 and forms an electrical connection, so as to realize actuation by heating the SMA wire 2 with electricity, which is convenient for control. The fixing method of the two ends of the SMA wire 2 can adopt the upper and lower clamps to clamp by riveting, and the crimping surface can also increase the structure such as bite teeth to increase the connection stability of the SMA wire, and will not destroy the characteristics of the SMA wire, so as to ensure stable and accurate actuation. The SMA wire 2 provides an actuation force to drive the power input end 11 of the driving rod 1 to rotate, so that the power output end 12 synchronously follows the rotation and amplifies the rotation arc length. The power output end 12 acts on the lens carrier 4 to rotate the lens carrier 4 around the lens optical axis. By utilizing the characteristic of SMA (Shape Memory Alloys) wire shrinking when heated and through the principle of lever, anti-shake with a larger stroke is realized, and the power output end 12 of the driving rod acts on the lens carrier 4 to rotate the lens carrier 4 around the optical axis of the lens. The movement of the lens in the direction perpendicular to the optical axis can be adjusted, thereby realizing the OIS (optical image stabilization) function by adjusting the inclination angle of the lens, thereby improving the performance of the lens.

[0029] See also Figure 1 , 2As shown in , 3, 4, and 5, this embodiment further has the feature that the driving rod 1 is embedded between the supporting base 3 and the lens carrier 4, the power input end 11 and the power output end 12 of the driving rod 1 rotate on the same plane built by the supporting base 3, and an outwardly extending elastic arm 14 is provided on one side of the transfer part 13, the outwardly extending end of the elastic arm 14 is fixed on the supporting base 3, and the elastic arm 14 is used for the rotation and reset of the power input end 11 and the power output end 12. The structure is simple, and it is convenient to manufacture and assemble. The driving rod 1 is embedded between the supporting base 3 and the lens carrier 4, and only slightly increases the size of the product on the optical axis of the lens, without widening the periphery, which conforms to the design concept of product miniaturization. Furthermore, the support base 3 has a bearing surface 31 facing the lens carrier 4 and an optical through hole 32 located in the middle of the bearing surface 31. Four driving rods 1 and four SMA wires 2 are arranged on the bearing surface 31. The driving rods 1 and the SMA wires 2 are arranged in pairs around the optical through hole 32 and all the driving rods 1 are enclosed to form a movable quadrilateral. The driving rods 1 on the opposite sides are driven to rotate in the same direction on the bearing surface 31 by the corresponding SMA wires 2, and the power output end 12 of the driving rod 1 moves away from the center of the optical through hole 32 on the bearing surface 31. This structure can adjust the displacement and rotation angle of the lens carrier 4 in four directions around the optical through hole 32, and can also adjust the opposite sides synchronously, so as to adjust the movement of the lens in the direction perpendicular to the optical axis, thereby realizing the function of OIS (optical image stabilization) by adjusting the lens tilt angle. The structure is simple, the control is simple and accurate, the operation is stable and reliable, and it is suitable for promotion and utilization.

[0030] See also Figure 1 , 2 As shown in , 3, 4, and 5, this embodiment is further that a toggle portion 121 is provided on the power output end 12 of the driving rod 1, and the toggle portion 121 protrudes toward the direction of the lens carrier 4 relative to the bearing surface 31, and a toggle matching groove 41 is provided on the lens carrier 4, so that the toggle portion 121 is inserted into the toggle matching groove 41 to drive the lens carrier 4 to rotate around the lens optical axis. In the embodiment in the figure, the toggle portion 121 is a sheet body of a direct bending structure of the driving rod 1, and the toggle matching groove 41 is also a groove body of a corresponding size, which satisfies the toggle portion 121 inserted into the toggle matching groove 41 to drive the lens carrier 4 to rotate around the lens optical axis, including the forward movement driven by the SMA wire 2 and the reverse movement pulled back by the elastic arm 14. The toggle portion 121 is inserted into the toggle matching groove 41, and is active. The insertion depth satisfies that the lens carrier 4 will not be separated when the lens optical axis moves, thereby ensuring focusing and anti-shake.

[0031] See also Figure 1 , 2As shown in Figures 3, 4, and 5, the present embodiment is further characterized in that a support boss 311 is provided on the bearing surface 31 of the support base 3, and the support boss 311 receives the transfer portion 13 of the drive rod 1, and the pin shaft 312 preset on the support boss 311 is inserted into the positioning hole 131 provided in the transfer portion 13 to form a fulcrum for rotation. The number of the support bosses 311 is consistent with the number of the drive rods 1, and the receiving heights of all the support bosses 311 are consistent, so that the drive rods 1 are erected at the same height, and an assembly avoidance space is obtained on the lower side of the drive rod 1. The SMA wire 2 is arranged along the movable quadrilateral enclosed by the drive rod 1, and the SMA wire 2 is located in the assembly avoidance space on the lower side of the drive rod 1. This structure facilitates the assembly of the drive rod and the SMA wire, has a compact structure, but does not interfere, and has stable and reliable operation. Furthermore, in this embodiment, the elastic arms 14 of the four driving rods 1 are grouped and connected together through the extended ends and fixed on the support base 3. This structure is easy to manufacture, and provides a certain relative position, increases the structural integrity of the product, and is also convenient for assembly.

[0032] The present invention utilizes the characteristic of SMA (Shape Memory Alloys) wire shrinking when heated to make a driving mechanism, and realizes anti-shake with a large stroke through the principle of lever, and is used to make a lens anti-shake device, which can adjust the movement of the lens in the direction perpendicular to the optical axis, thereby realizing the OIS (optical image stabilization) function by adjusting the lens inclination angle, and improving the performance of the lens. The SMA wire is small in size and effectively simplifies the driving structure, so that the product miniaturization requirements are met, the product structure is lightweight and miniaturized, and the manufacturing cost is reduced. At the same time, the control is simple and accurate, and it is suitable for promotion and utilization.

[0033] Although the preferred specific embodiments of the present invention are described above in conjunction with the accompanying drawings, the present invention should not be limited to the structures and operations that are exactly the same as the above descriptions and drawings. For those skilled in the art, many equivalent improvements and changes can be made to the above embodiments through logical analysis, reasoning or limited experiments without exceeding the concept and scope of the present invention, but these improvements and changes should all fall within the scope of protection required by the present invention.

Claims

1. A driving mechanism, characterized in that: have: A driving rod (1), the driving rod (1) being provided with a power input end (11), a power output end (12) and a transfer portion (13) located between the power input end (11) and the power output end (12), wherein the distance from the power input end (11) to the transfer portion (13) is smaller than the distance from the power output end (12) to the transfer portion (13); the transfer portion (13) providing a fulcrum for the synchronous rotation of the power input end (11) and the power output end (12); the power input end (11) and the power output end (12) rotate on the same plane, an outwardly extending elastic arm (14) is provided on one side of the transfer portion (13), the outwardly extending end of the elastic arm (14) is fixed, and the elastic arm (14) is used for rotational reset of the power input end (11) and the power output end (12); the elastic arm (14) is made of an integrated structure; An SMA wire (2) is provided, one end of the SMA wire (2) is connected to a power input end (11) of a driving rod (1), and the other end of the SMA wire (2) is fixedly arranged. The SMA wire (2) provides an actuating force to drive the power input end (11) of the driving rod (1) to rotate, so that the power output end (12) synchronously follows the rotation and amplifies the rotation arc length.

2. A lens anti-shake device, characterized in that: have: Support base (3), A lens carrier (4), the lens carrier (4) being supported on the support base (3) via a suspension system; A driving rod (1), the driving rod (1) being provided with a power input end (11), a power output end (12) and a transfer portion (13) located between the power input end (11) and the power output end (12), wherein the distance from the power input end (11) to the transfer portion (13) is smaller than the distance from the power output end (12) to the transfer portion (13); the transfer portion (13) is hinged on a support base (3) to provide synchronous rotation of the power input end (11) and the power output end (12). The driving rod (1) is embedded between the supporting base (3) and the lens carrier (4); the power input end (11) and the power output end (12) of the driving rod (1) rotate on the same plane built by the supporting base (3); an outwardly extending elastic arm (14) is provided on one side of the transfer part (13); the outwardly extending end of the elastic arm (14) is fixed on the supporting base (3); the elastic arm (14) is used for the rotation and reset of the power input end (11) and the power output end (12); An SMA wire (2) is provided, one end of the SMA wire (2) is connected to a power input end (11) of a driving rod (1), and the other end of the SMA wire (2) is fixed to a support base (3) via a conductive terminal (5) to form an electrical connection. The SMA wire (2) provides an actuating force to drive the power input end (11) of the driving rod (1) to rotate, so that the power output end (12) synchronously follows the rotation and amplifies the rotation arc length. The power output end (12) acts on a lens carrier (4) to cause the lens carrier (4) to rotate around the lens optical axis. The two ends of the SMA wire (2) are fixed by means of upper and lower clamping plates with riveting.

3. The lens anti-shake device according to claim 2, characterized in that: The support base (3) has a bearing surface (31) facing the lens carrier (4) and an optical through hole (32) located in the middle of the bearing surface (31). Four driving rods (1) and four SMA wires (2) are arranged on the bearing surface (31). The driving rods (1) and the SMA wires (2) are paired and arranged around the optical through hole (32), and all the driving rods (1) are enclosed to form a movable quadrilateral. The driving rods (1) on opposite sides are driven to rotate in the same direction on the bearing surface (31) by the corresponding SMA wires (2), and the power output end (12) of the driving rod (1) moves away from the center of the optical through hole (32) on the bearing surface (31).

4. The lens anti-shake device according to claim 3, characterized in that: A toggle portion (121) is provided on the power output end (12) of the driving rod (1), the toggle portion (121) protruding relative to the bearing surface (31) in the direction of the lens carrier (4), and a toggle matching groove (41) is provided on the lens carrier (4), so that the toggle portion (121) is inserted into the toggle matching groove (41) to drive the lens carrier (4) to rotate around the lens optical axis.

5. The lens anti-shake device according to claim 3, characterized in that: A support boss (311) is provided on the bearing surface (31) of the support base (3), the support boss (311) receives the transfer portion (13) of the driving rod (1), and a pin shaft (312) preset on the support boss (311) is inserted into a positioning hole (131) provided in the transfer portion (13) to form a fulcrum for rotation; the number of the support bosses (311) is consistent with the number of the driving rods (1), and the receiving heights of all the support bosses (311) are consistent, so that the driving rods (1) are erected at the same height, and an assembly avoidance space is obtained on the lower side of the driving rod (1); the SMA wire (2) is arranged along the movable quadrilateral enclosed by the driving rod (1), and the SMA wire (2) is located in the assembly avoidance space on the lower side of the driving rod (1).

6. The lens anti-shake device according to claim 3, characterized in that: The elastic arms (14) of the four driving rods (1) are connected together in groups through the extended ends and fixed on the supporting base (3).

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