CN-122018110-A - Driving motor, camera module and electronic equipment

Abstract

The invention provides a driving motor, a camera module and an electronic device, wherein the driving motor comprises a fixed part, a moving part and a supporting component, the fixed part comprises a base and a shell covered on the base, the moving part is used for bearing an optical lens and is movably arranged on the base, the shell is covered on the periphery of the moving part, the supporting component comprises a shaft member and a first motion conversion piece, the shaft member is arranged on the base, the first motion conversion piece is movably sleeved on the shaft member 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 member 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 member 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.

Inventors

• JIANG JINWEI
• ZHANG JIE
• ZHANG XIAOLIANG

Assignees

• 上海比路电子股份有限公司

Dates

Publication Date

20260512

Application Date

20260407

Claims (20)

1. 1. A drive motor, 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 member and a first motion conversion piece, wherein the shaft member is arranged on the base, the first motion conversion piece is movably sleeved on the shaft member and connected with the moving part to allow the moving part to move along a first straight line direction relative to the shaft member 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 member 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.
2. 2. The drive motor according to claim 1, wherein 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.
3. 3. The driving motor 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 drive motor according to claim 2, wherein the bearing is a ball bearing, and balls are provided between an outer race and an inner race of the bearing, the balls being in rolling contact with the shaft member.
5. 5. The driving motor as recited in claim 1 wherein said support assembly further comprises two second motion converting members disposed at both ends of said shaft member in said first linear direction and in rolling contact with said fixed portion, respectively, such that when said moving portion is driven to move in a plane perpendicular to said first linear direction, said moving portion is capable of moving said second motion converting members in said plane relative to said fixed portion.
6. 6. The drive motor of claim 5, wherein the second motion converter is a ball.
7. 7. The driving motor 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 to enable the first split body and the second split body to be fixedly connected coaxially, the diameters of the first split body and the second split body are identical, and an external circumference surface with smooth transition is formed at a connecting position.
8. 8. The drive motor according to claim 7, wherein both ends of the shaft member are provided with recesses or mounting grooves for receiving and holding the balls.
9. 9. The driving motor as recited in claim 8, wherein the recess or the mounting groove is a ball-and-socket structure, and is engaged with the ball to form a ball joint.
10. 10. The drive motor 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 a displacement amount 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 drive motor of any one of claims 1-10, further comprising a first drive structure for driving the moving portion to move in the first linear direction and a second drive structure for driving the moving portion to move in a plane perpendicular to the first linear direction.
12. 12. The driving motor according to claim 11, wherein the first driving structure is an electromagnetic driving assembly, and the first driving structure includes a first driving magnet and a focusing coil, the first driving magnet is disposed on the moving portion, the focusing coil is disposed on the fixed portion, or the first driving magnet is disposed on the fixed portion, and the focusing coil is disposed on the moving portion.
13. 13. The driving motor according to claim 12, wherein the second driving structure is an electromagnetic driving assembly, 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.
14. 14. The drive motor according to claim 13, wherein the first drive structure and the second drive structure share a same drive magnet provided to the moving portion.
15. 15. The drive motor of claim 11, wherein the first drive structure comprises a shape memory alloy spring having one end fixed to the housing and the other end fixed to the moving portion.
16. 16. The drive motor of claim 15, further comprising at least one temperature sensing thermistor disposed on the moving portion or the fixed portion and thermally coupled to the shape memory alloy spring, the temperature sensing thermistor configured to detect a temperature of the shape memory alloy spring and output a corresponding electrical signal.
17. 17. The driving motor according to claim 15, wherein the number of the shape memory alloy springs is four, and the four shape memory alloy springs are distributed in a cross symmetry or rectangular quadrangle.
18. 18. The drive motor of claim 15, wherein the shape memory alloy springs comprise a first set of springs and a second set of springs that are symmetrical along an optical axis of the optical lens, the first set of springs being powered by a first drive circuit and the second set of springs being powered by a second drive circuit, the first drive circuit and the second drive circuit being configured to be capable of outputting the same drive current simultaneously to reduce a response delay of movement of the moving portion in the optical axis direction, or the first drive circuit and the second drive circuit being configured to be capable of outputting different drive currents, respectively, to cause tilting movement of the moving portion.
19. 19. The drive motor according to claim 11, further comprising a reset element configured to provide a restoring force toward an initial position to the moving portion; the reset element comprises a magnetic attraction piece arranged on the base and is used for magnetically attracting with a magnetic attraction part arranged on the moving part.
20. 20. A camera module comprising the drive motor of any one of claims 1-19.

Description

Driving motor, camera module and electronic equipment Technical Field The invention belongs to the technical field of camera equipment, and particularly relates to a driving motor, 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 motor 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 ensure the motion precision and the structural reliability is 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 driving motor, 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 driving motor, 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 member and a first motion conversion piece, wherein the shaft member is arranged on the base, the first motion conversion piece is movably sleeved on the shaft member and connected with the moving part to allow the moving part to move along a first straight line direction relative to the shaft member 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 member 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. 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 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, t