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CN-121978815-A - Lens driving device, camera module and electronic equipment

CN121978815ACN 121978815 ACN121978815 ACN 121978815ACN-121978815-A

Abstract

The invention provides a lens driving device, a camera module and electronic equipment, wherein the lens driving device comprises a fixed part, a moving part, a supporting component, a first driving structure and a second driving structure, the fixed part comprises a base and a shell, the moving part is used for bearing an optical lens, the supporting component comprises a shaft component and a first motion conversion piece, the shaft component is arranged on the base, the first motion conversion piece is movably sleeved on the shaft component and connected with the moving part so as to allow the moving part to move along a first straight line direction relative to the shaft component through the first motion conversion piece, when the moving part is driven to move in a plane perpendicular to the first straight line direction, the moving part can drive the shaft component to move in the plane relative to the fixed part, the first straight line direction is parallel to the optical axis direction of the optical lens, the first driving structure is a piezoelectric driving structure, and the quantity of the lens driving device is remarkably reduced, so that the material cost is reduced, the assembly process is simplified, and the product yield is improved.

Inventors

  • GONG GAOFENG
  • WANG LIN

Assignees

  • 上海比路电子股份有限公司

Dates

Publication Date
20260505
Application Date
20260407

Claims (16)

  1. 1. A lens driving apparatus, comprising: the fixing part comprises a base and a shell arranged on the base; A moving part for carrying an optical lens, movably mounted to the base, the housing being covered on the outer periphery of the moving part; The support assembly comprises a shaft component and a first motion conversion piece, wherein the shaft component is arranged on the base, the first motion conversion piece is movably sleeved on the shaft component and is connected with the moving part so as to allow the moving part to move along a first straight line direction relative to the shaft component through the first motion conversion piece, and when the moving part is driven to move in a plane perpendicular to the first straight line direction, the moving part can drive the shaft component to move in the plane relative to the fixed part, and the first straight line direction is parallel to the optical axis direction of the optical lens; the first driving structure is used for driving the moving part to move along the first linear direction and is a piezoelectric driving structure; and the second driving structure is used for driving the moving part to move in a plane perpendicular to the first linear direction.
  2. 2. The lens driving apparatus according to claim 1, wherein the first motion converting member includes a bearing, an inner ring of the bearing is slidably fitted with the shaft member, and an outer ring of the bearing is fixed with the moving portion.
  3. 3. The lens driving apparatus according to claim 2, wherein the moving portion is provided with a mounting notch, and the outer ring of the bearing is at least partially accommodated in the mounting notch.
  4. 4. The lens driving apparatus according to claim 2, wherein the bearing is a ball bearing, and balls are provided between an outer ring and an inner ring of the bearing, and the balls are in rolling contact with the shaft member.
  5. 5. The lens driving apparatus according to claim 1, wherein the support assembly further comprises two second motion converting members respectively provided at both ends of the shaft member in the first linear direction and in rolling contact with the fixed portion, such that when the moving portion is driven to move in a plane perpendicular to the first linear direction, the moving portion can drive the second motion converting members to move in the plane relative to the fixed portion.
  6. 6. The lens driving apparatus according to claim 5, wherein the second motion converting member is a ball.
  7. 7. The lens driving device according to claim 6, wherein the shaft member comprises a first split body and a second split body, wherein a protruding shaft section is arranged at one end of the first split body, an external thread is arranged on the periphery of the protruding shaft section, a concave hole is arranged at one end of the second split body, an internal thread matched with the external thread is arranged on the inner wall of the concave hole, the protruding shaft section is screwed into the concave hole, the first split body and the second split body are coaxially and fixedly connected, the diameters of the first split body and the second split body are the same, and an external circumference surface with smooth transition is formed at the connecting position.
  8. 8. The lens driving apparatus as claimed in claim 7, wherein both ends of the shaft member are provided with recesses or mounting grooves for receiving and holding the second motion converting member.
  9. 9. The lens driving apparatus according to claim 8, wherein the recess or the mounting groove is of a ball-and-socket structure, and forms a ball-and-socket engagement with the second motion converting member.
  10. 10. The lens driving apparatus according to claim 1, further comprising a limiting portion provided on the fixed portion, wherein a predetermined movement gap is provided between the moving portion and the limiting portion in a plane perpendicular to the first linear direction, and when an amount of displacement of the moving portion in the plane reaches the movement gap, the moving portion abuts against the limiting portion to limit further movement of the moving portion in the plane.
  11. 11. The lens driving device according to any one of claims 1 to 10, wherein the piezoelectric driving structure comprises a piezoelectric vibrator and a driving friction member, the driving friction member is mounted at an output end of the piezoelectric vibrator, the driving friction member reciprocates along the first linear direction when the piezoelectric vibrator acts, the lens friction member is fixedly connected to the moving portion, and the driving friction member is in friction connection with the lens friction member to drive the moving portion to move along the first linear direction.
  12. 12. The lens driving apparatus according to claim 11, wherein: The piezoelectric driving structure further comprises a balancing weight and a ball, the balancing weight is arranged at one end, far away from the driving friction piece, of the piezoelectric vibrator, the ball is arranged between the balancing weight or the piezoelectric vibrator and the base, so that the piezoelectric driving structure can enable the piezoelectric vibrator to drive the driving friction piece to slide relative to the base along the first straight line direction after the ball is abutted to the base, and the piezoelectric vibrator is driven by the moving part to move along with the moving part in a plane perpendicular to the first straight line direction.
  13. 13. The lens driving apparatus according to claim 12, wherein: The base is provided with a magnetic attraction piece, the magnetic attraction piece and the balancing weight are arranged opposite to each other, and the magnetic attraction piece is used for attracting the piezoelectric driving structure to the base through magnetic attraction and enabling the balls to be kept in butt joint with the base.
  14. 14. The lens driving device according to claim 11, wherein the second driving structure is an electromagnetic driving structure, the second driving structure includes a second driving magnet and an anti-shake coil, the second driving magnet is disposed on the moving portion, the anti-shake coil is disposed on the fixed portion, or the second driving magnet is disposed on the fixed portion, the anti-shake coil is disposed on the moving portion, and the anti-shake coil is symmetrically disposed along a circumferential direction.
  15. 15. A camera module comprising the lens driving apparatus of any one of claims 1 to 14.
  16. 16. An electronic device comprising the lens driving apparatus according to any one of claims 1 to 14.

Description

Lens driving device, camera module and electronic equipment Technical Field The invention belongs to the technical field of camera equipment, and particularly relates to a lens driving device, a camera module and electronic equipment. Background Along with the rapid development of portable electronic devices such as smart phones and tablet computers, the miniaturization and high performance requirements of the camera module are urgent, and the lens driving device is usually required to simultaneously realize two functions of Auto Focus (AF) and optical anti-shake (Optical Image Stabilization; OIS), namely, displacement compensation of the optical lens along the optical axis direction and shake compensation in a plane perpendicular to the optical axis, so that how to integrate the functions in a limited space, and simultaneously ensure motion precision and structural reliability becomes the core direction of technical attack in the field. Existing conventional solutions typically employ a stacked structure of "AF mover carrying OIS components" or "OIS mover carrying AF components". Taking a typical ball-guided anti-shake motor as an example, it generally includes a bracket for realizing OIS plane motion, an AF mover for carrying an optical lens, and a plurality of balls respectively disposed on the upper and lower sides of the bracket. The support is supported on the base through bottom balls and can move along an XY plane, and the AF rotor is supported on the support through top balls and can move along the Z-axis direction. In order to keep stable suspension and guide of the AF rotor, an upper spring (F spring) and a lower spring (B spring) are also required to be arranged to connect the AF rotor with the bracket and provide a restoring force and an energizing path. In addition, in order to accommodate and restrain the plurality of balls, a plurality of precise grooves are required to be formed on the bracket and the corresponding structural member. The laminated structure causes a plurality of motor components, at least comprising a bracket, an AF rotor, an upper spring, a lower spring, a plurality of groups of balls and a plurality of groove processing structures, and the assembly process is complex. Disclosure of Invention The invention provides a lens driving device, a camera module and an electronic device, which can simplify the number of motor parts and are beneficial to the miniaturization of the structure. The technical scheme adopted by the invention for solving the technical problems is that the first aspect of the invention provides a lens driving device, which comprises: the fixing part comprises a base and a shell arranged on the base; A moving part for carrying an optical lens, movably mounted to the base, the housing being covered on the outer periphery of the moving part; The support assembly comprises a shaft component and a first motion conversion piece, wherein the shaft component is arranged on the base, the first motion conversion piece is movably sleeved on the shaft component and is connected with the moving part so as to allow the moving part to move along a first straight line direction relative to the shaft component through the first motion conversion piece, and when the moving part is driven to move in a plane perpendicular to the first straight line direction, the moving part can drive the shaft component to move in the plane relative to the fixed part, and the first straight line direction is parallel to the optical axis direction of the optical lens; the first driving structure is used for driving the moving part to move along the first linear direction and is a piezoelectric driving structure; and the second driving structure is used for driving the moving part to move in a plane perpendicular to the first linear direction. In an embodiment, the first motion converter includes a bearing, an inner ring of which is slidably fitted with the shaft member, and an outer ring of which is fixed with the moving portion. In an embodiment, the moving part is provided with a mounting notch, and the outer ring of the bearing is at least partially accommodated in the mounting notch. In one embodiment, the bearing is a ball bearing, and balls are arranged between an outer ring and an inner ring of the bearing and are in rolling contact with the shaft member. In an embodiment, the support assembly further includes two second motion conversion members, and the two second motion conversion members are respectively disposed at two ends of the shaft member along the first linear direction and are in rolling contact with the fixed portion, so that when the moving portion is driven to move in a plane perpendicular to the first linear direction, the moving portion can drive the second motion conversion members to move in the plane relative to the fixed portion. In one embodiment, the second motion converter is a ball. In an embodiment, the shaft member comprises a first split body and a second sp