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CN-121596498-B - Driving unit, driving device, camera module and driving unit preparation method

CN121596498BCN 121596498 BCN121596498 BCN 121596498BCN-121596498-B

Abstract

The invention relates to a driving unit, a driving device, an image pickup module and a driving unit manufacturing method. The driving unit is used for driving the optical element and comprises a substrate, a coil, a magnet and a magnetic piece, wherein the coil is fixed on the substrate, the coil and the magnet are arranged at intervals along a first direction, the center of the magnet is located at a second offset side of the center of the coil, the magnet can be driven to move relative to the coil after the coil is electrified, the magnetic piece is fixed on the coil and/or the substrate, the center of the magnetic piece is located at a first offset side of the center of the coil so as to enhance driving force between a part of the coil located at the first offset side and the magnet, the first offset side and the second offset side are opposite to each other along a third direction, the third direction is perpendicular to the first direction, and the magnetic piece can increase driving force generated by partial coils at the first offset side so as to enable the driving force at two sides of the coil to be symmetrical.

Inventors

  • YAO LIFENG
  • ZHENG XUEYING
  • ZHENG CHENGCHANG
  • ZHU JUNLONG

Assignees

  • 宁波舜宇光电信息有限公司

Dates

Publication Date
20260505
Application Date
20260127

Claims (16)

  1. 1. The driving unit is used for driving the optical element and is characterized by comprising a substrate, a coil, a magnet and a magnetic piece, wherein the coil is fixed on the substrate, the coil and the magnet are arranged at intervals along a first direction, the center of the magnet is positioned at a second offset side of the center of the coil, and the coil can drive the magnet to move relative to the coil after being electrified; The magnetic piece is fixed on the coil and/or the substrate, and the center of the magnetic piece is positioned on the first offset side of the center of the coil so as to enhance the driving force between the part of the coil positioned on the first offset side and the magnet; the magnetic part is a magnetic glue layer, and the magnetic glue layer comprises a glue layer matrix and magnetic fillers distributed in the glue layer matrix; the first offset side and the second offset side are opposite sides of the coil center along a third direction, and the third direction is perpendicular to the first direction.
  2. 2. Drive unit according to claim 1, characterized in that the magnetic element comprises a permanent magnetic material and/or a soft magnetic material.
  3. 3. The drive unit according to claim 1, characterized in that a surface of the base plate in the first direction is provided with protrusions and/or recesses, which protrusions are located on the second offset side of the coil center, and which recesses are located on the first offset side of the coil center.
  4. 4. The drive unit of claim 1, wherein the magnetic member is located entirely on the first offset side of the coil center.
  5. 5. The drive unit according to claim 4, wherein the coil is annular to form a receiving cavity between an inner wall of the coil and the substrate, and wherein the dimension of the magnetic member in the third direction is 10% -40% of the dimension of the receiving cavity in the third direction.
  6. 6. The drive unit of claim 1, wherein a portion of the magnetic member is located on the second offset side of the coil center.
  7. 7. The drive unit according to claim 6, wherein the coil is annular to form a receiving cavity between an inner wall of the coil and the substrate, and wherein the dimension of the magnetic member in the third direction is 60% -90% of the dimension of the receiving cavity in the third direction.
  8. 8. The drive unit of claim 1, wherein the magnetic member is in contact with an inner wall of the coil.
  9. 9. The drive unit according to claim 1, wherein the magnet has two or more magnetic poles on a side facing the coil, a magnetic pole direction of the magnet on the side facing the coil is parallel to a second direction, and a moving direction of the magnet with respect to the coil is parallel to the second direction, wherein the second direction is perpendicular to the first direction and the third direction.
  10. 10. The drive unit according to claim 9, wherein the magnetic members are symmetrically arranged along both sides of the third direction.
  11. 11. The drive unit according to claim 1, wherein a cross-sectional area of the magnetic member in a direction perpendicular to the third direction decreases toward the second bias side.
  12. 12. The drive unit of claim 1, further comprising a position sensor fixed to the substrate and located outside the coil, and the position sensor is located on the second offset side of the coil.
  13. 13. The drive unit of claim 1, wherein a projection of the magnetic member in the first direction is entirely within a projection range of the coil.
  14. 14. A driving device for driving an optical element, comprising a first frame, a second frame, a supporting member and a driving assembly; wherein the first frame is used for bearing the optical element, and the supporting piece is arranged between the first frame and the second frame and is used for movably suspending the first frame to the second frame; The drive assembly comprising the drive unit of any one of claims 1-11 and configured to drive the first frame to move relative to the second frame.
  15. 15. An image pickup module, comprising an optical lens, a photosensitive module and the driving device of claim 14; the optical lens is arranged on one of the first frame or the second frame and is used for receiving light rays along the direction of the optical axis of the optical lens and emitting the light rays; The photosensitive module is arranged on the other one of the first frame or the second frame and is used for receiving the light rays emitted by the optical lens to image.
  16. 16. A method of manufacturing a drive unit adapted for use in a drive unit as claimed in claim 1, comprising the steps of: a. Fixing a coil on a substrate to form a containing cavity between the inner wall of the coil and the substrate; b. applying a magnetic element into the accommodating cavity such that the center of the magnetic element is located on a first offset side of the center of the coil; c. The substrate and the magnet are arranged on the two frames at intervals along the first direction, so that the coil and the magnet are arranged at intervals along the first direction, the center of the magnet is located at the second offset side of the center of the coil, the first offset side and the second offset side are two sides of the center of the coil opposite to each other along the third direction, and the third direction is perpendicular to the first direction.

Description

Driving unit, driving device, camera module and driving unit preparation method Technical Field The invention relates to the technical field of camera modules, in particular to a driving unit, a driving device, a camera module and a driving unit preparation method. Background In electronic devices such as mobile phones, tablet devices, and wearable devices, camera modules have become standard configurations. In order to ensure the shooting effect, the shooting module needs to integrate functions such as optical focusing (AF), optical anti-shake (OIS) or optical zooming (Zoom). Any of the above functions is realized by driving the lens group or the photosensitive chip by the motor to perform micro-displacement or rotation along at least one direction. The current mainstream market is Voice Coil Motor (VCM), which generates driving force by using lorentz force between an energizing Coil and a magnet. However, due to the limitation of the internal space layout of the module, the situation that the coil and the magnet are not exactly opposite to each other is often caused in the current design of part of voice coil motors, namely, the coil and the magnet are biased, and the asymmetric arrangement of the coil and the magnet can lead to uneven distribution of a magnetic field in an action plane, so that the driving force generated by the coil on the magnet is asymmetric, further, the motor motion control precision is reduced, the power consumption is increased, and the coil and the magnet can possibly generate relative deflection. Disclosure of Invention Based on this, it is necessary to provide a driving unit, a driving device, an imaging module and a driving unit manufacturing method capable of making the driving force symmetrical by compensating the magnetic field intensity of the coil, aiming at the problems that the driving force is asymmetric under the bias condition of the coil and the magnet in the current motor, so that the motor motion precision is reduced and the coil and the magnet may deflect relatively. The application firstly provides a driving unit which is used for driving an optical element and comprises a substrate, a coil, a magnet and a magnetic piece, wherein the coil is fixed on the substrate, the coil and the magnet are arranged at intervals along a first direction, the center of the magnet is positioned at a second offset side of the center of the coil, and the coil can drive the magnet to move relative to the coil after being electrified; The magnetic piece is fixed on the coil and/or the substrate, and the center of the magnetic piece is positioned on the first offset side of the center of the coil so as to enhance the driving force between the part of the coil positioned on the first offset side and the magnet; the first offset side and the second offset side are opposite sides of the coil center along a third direction, and the third direction is perpendicular to the first direction. In one embodiment, the magnetic member comprises a permanent magnet material and/or a soft magnetic material. In one embodiment, the magnetic member is a magnetic glue layer, and the magnetic glue layer includes a glue layer matrix and magnetic fillers distributed inside the glue layer matrix. In one embodiment, the surface of the substrate along the first direction is provided with a convex part and/or a concave part located in the accommodating cavity, the convex part is located on the second offset side of the coil center, and the concave part is located on the first offset side of the coil center. In one embodiment, the magnetic member is located entirely on the first offset side of the coil center. In one embodiment, the coil is annular, so that an accommodating cavity is formed between the inner wall of the coil and the substrate, and the size of the magnetic piece along the third direction accounts for 10% -40% of the size of the accommodating cavity along the third direction. In one embodiment, a portion of the magnetic member is located on the second offset side of the coil center. In one embodiment, the coil is annular, so that an accommodating cavity is formed between the inner wall of the coil and the substrate, and the dimension of the magnetic piece along the third direction accounts for 60% -90% of the dimension of the accommodating cavity along the third direction. In one embodiment, the magnetic member is in contact with an inner wall of the receiving chamber. In one embodiment, the magnet has two or more magnetic poles facing the coil, the direction of the magnetic poles facing the coil is parallel to a second direction, and the direction of movement of the magnet relative to the coil is parallel to the second direction, wherein the second direction is perpendicular to the first direction and the third direction. In one embodiment, the magnetic members are symmetrically disposed along both sides of the third direction. In one embodiment, the magnetic member decreases in cross-sectional a