Optical element driving mechanism

Patent metadata

Field	Value
Publication number	US-11555981-B2
Application number	US-202016900608-A
Country	US
Kind code	B2
Filing date	Jun 12, 2020
Priority date	Jun 14, 2019
Publication date	Jan 17, 2023
Grant date	Jan 17, 2023

Abstract

An optical element driving mechanism is provided and includes a fixed assembly, a movable assembly, a driving assembly and a stopping assembly. The fixed assembly has a main axis. The movable assembly is configured to connect an optical element, and the movable assembly is movable relative to the fixed assembly. The driving assembly is configured to drive the movable assembly to move relative to the fixed assembly. The stopping assembly is configured to limit the movement of the movable assembly relative to the fixed assembly within a range of motion.

First claim

What is claimed is:

1. An optical element driving mechanism, comprising:
a fixed assembly, having a main axis;
a movable assembly, configured to be connected to an optical element, wherein the movable assembly is movable relative to the fixed assembly;
a driving assembly, configured to drive the movable assembly to move relative to the fixed assembly; and
a stopping assembly, configured to limit the movement of the movable assembly relative to the fixed assembly within a range of motion;
wherein the fixed assembly includes a first side and a second side;
wherein the stopping assembly includes a first stopping element and a second stopping element;
wherein when viewed along the main axis, the first stopping element is located on the second side, and the second stopping element is located on the second side;
wherein a shortest distance between the first stopping element and the second stopping element is not zero in the main axis;
wherein when viewed along the main axis, the first stopping element overlaps at least a part of the second stopping element;
wherein a shortest distance between the first stopping element and a casing of the fixed assembly is different from a shortest distance between the second stopping element and the casing.

2. The optical element driving mechanism as claimed in claim 1 , wherein when viewed along the main axis, the fixed assembly includes:
the first side, extending in a first direction;
the second side, extending in a second direction;
a third side, wherein the first side and the third side are respectively located on two sides of the movable assembly; and
a fourth side, wherein the second side and the fourth side are respectively located on two sides of the movable assembly.

3. The optical element driving mechanism as claimed in claim 2 , wherein the driving assembly includes a driving coil, and a winding axis of the driving coil is parallel to the main axis;
wherein the driving coil includes:
a first segment, parallel to the first side;
a second segment, not parallel to the first side and the second side;
a third segment, not parallel to the first side and the second side; and
a fourth segment, wherein the second segment is connected to the third segment via the fourth segment, wherein the fourth segment is parallel to the second side;
wherein the driving assembly further includes a magnetic element corresponding to the first segment;
wherein the magnetic element has a long strip-shaped structure and extends in the first direction;
wherein the driving assembly does not have a magnetic element corresponding to the second segment and the third segment;
wherein the driving assembly does not have a magnetic element corresponding to the fourth segment.

4. The optical element driving mechanism as claimed in claim 3 , wherein the movable assembly includes:
an electrical connection portion, wherein a leading wire of the driving coil is disposed on the electrical connection portion.

5. The optical element driving mechanism as claimed in claim 4 , wherein the movable assembly further includes a fixed surface and a receiving portion, wherein the fixed surface faces the driving coil;
wherein the fixed surface is directly in contact with the driving coil;
wherein the receiving portion is located on the fixed surface and is configured to receive at least a part of the leading wire;
wherein the receiving portion corresponds to the electrical connection portion;
wherein the optical element driving mechanism further includes a first adhesive element disposed in the receiving portion;
wherein the first adhesive element directly contacts the movable assembly and the leading wire;
wherein the first adhesive element directly contacts the driving coil;
wherein the first adhesive element directly contacts the second segment;
wherein the receiving portion includes a concave structure or an opening structure;
wherein the movable assembly further includes a support surface which is not parallel to the fixed surface;
wherein the support surface directly contacts the driving coil;
wherein the support surface directly contacts the second segment;
wherein the movable assembly further includes a guiding structure which is disposed on the support surface;
wherein at least a part of the first adhesive element is located in the guiding structure;
wherein the guiding structure is adjacent to the receiving portion;
wherein the guiding structure includes a concave structure or an opening structure;
wherein the movable assembly further includes a skirt portion, and a portion of the fixed surface is located at the skirt portion;
wherein the skirt portion extends in a direction that is not parallel to the winding axis;
wherein the skirt portion has a tapered structure, tapered in a direction which is not parallel to the winding axis.

6. The optical element driving mechanism as claimed in claim 5 , wherein the fixed assembly includes a base, the base includes a bottom plate and a base side wall, and the base side wall protrudes from an edge of the bottom plate;
wherein when viewed along the main axis, the base side wall is located on the second side;
wherein when viewed along the main axis, the electrical connection portion is located on the second side;
wherein when viewed in the first direction, the base side wall overlaps at least a portion of the third segment;
wherein when viewed in the first direction, the base side wall overlaps at least a portion of the second segment;
wherein when viewed in the first direction, the base side wall overlaps at least a portion of the fourth segment;
when the movable assembly moves to a limit position and when viewed in the second direction, the base side wall overlaps at least a part of the electrical connection portion;
wherein when viewed in the first direction, the base side wall does not overlap the electrical connection portion;
wherein when viewed in the first direction, the base side wall overlaps at least a portion of the second stopping element.

7. The optical element driving mechanism as claimed in claim 6 , wherein when viewed along the main axis, a casing side wall of the casing is located on the second side and corresponds to the base side wall;
wherein when viewed in the first direction, the first stopping element overlaps at least a part of the casing side wall.

8. The optical element driving mechanism as claimed in claim 7 , wherein the fixed assembly further includes an adhesive strengthening structure which is disposed on the base side wall or the casing side wall;
wherein the adhesive strengthening structure includes a trench;
wherein the adhesive strengthening structure includes a plurality of trenches;
wherein these trenches are parallel to each other.

9. The optical element driving mechanism as claimed in claim 8 , wherein the stopping assembly includes the first stopping element, the second stopping element, the casing side wall and the base side wall;
wherein a shortest distance between the first stopping element and the casing side wall is substantially equal a shortest distance between the second stopping element and the base side wall.

10. The optical element driving mechanism as claimed in claim 9 , wherein the optical element driving mechanism further includes a first elastic member and a second elastic member, and the movable assembly is movably connected to the fixed assembly via the first elastic member and the second elastic member;
wherein the first elastic member includes:
a first fixed part, configured to be fixed to the fixed assembly;
a first movable part, configured to be fixed to the movable assembly; and
a first elastic portion, wherein the first movable p

Assignees

• Tdk Taiwan Corp

Inventors

• Hu Chao-Chang
• Ho Liang-Ting
• Hsu Chen-Er
• Chan Yi-Liang
• Tseng Fu-Lai
• Wu Fu-Yuan
• Kuo Chen-Chi
• Wang Ying-Jen
• Hsia Wei-Han
• Tseng Yi-Hsin
• Lin Wen-Chang
• Liao Chun-Chia
• Liu Shou-Jen
• Chang Chao-Chun
• Lin Yi-Chieh
• Hsu Shang-Yu
• Liao yu-huai
• Hung Shih-Wei
• Lin Sin-Hong
• Lin Kun-Shih
• Lin Yu-Cheng
• Huang Wen-Yen
• Shen Wei-Jhe
• Wu Chih-Shiang
• SONG Sin-Jhong
• Chiu Che-Hsiang
• Lin Sheng-Chang

Classifications

• H04N23/57

  Mechanical or electrical details of cameras or camera modules specially adapted for being embedded in other devices · CPC title

• H01F5/04

  Arrangements of electric connections to coils, e.g. leads · CPC title

• H04N23/687

  by shifting the lens or sensor position · CPC title

• G02B7/09 Primary

  adapted for automatic focusing or varying magnification · CPC title

• G03B13/36

  Autofocus systems · CPC title