Optical image stabilization camera module

Patent metadata

Field	Value
Publication number	US-12323706-B2
Application number	US-202118037005-A
Country	US
Kind code	B2
Filing date	Oct 29, 2021
Priority date	Nov 19, 2020
Publication date	Jun 3, 2025
Grant date	Jun 3, 2025

Abstract

The present application relates to an optical image stabilization camera module, comprising: a lens; a photosensitive assembly having a photosensitive chip; a first driving part adapted to drive the lens to translate in x-axis and y-axis directions; and a second driving part comprising a second basic portion and a second movable portion, the second driving part having four side surfaces, wherein each side surface is provided with two interlaced SMA wires, and both ends of each SMA line are connected to a fixed end of the second basic portion and a fixed end of the second movable portion, respectively; each of the fixed ends is located at a corner area of the second basic portion or the second movable portion. The photosensitive assembly is fixed to the second movable portion, and the second movable portion is adapted to drive, under the drive of the SMA lines, the photosensitive chip to move in an xoy plane; and the lens and the photosensitive chip are configured to be simultaneously driven and move in opposite directions. According to the present application, the image stabilization stroke and the image stabilization response speed of the camera module can be improved at the cost of a small volume.

First claim

What is claimed is:

1. An optical image stabilization camera module, comprising:
a lens;
a photosensitive assembly having a photosensitive chip;
a first driving part adapted to mount the lens and drive the lens to translate in the directions of an x-axis and a y-axis; and
a second driving part comprising a second basic portion and a second movable portion, wherein the second basic portion and the second movable portion are movably connected by means of an elastic connecting portion, and the second driving part has four side surfaces; each side surface is provided with two interlaced shape memory alloy (SMA) wires, and two ends of each SMA wire are connected to a fixed end of the second basic portion and a fixed end of the second movable portion, respectively; and
each of the fixed ends is located in a corner area of the second basic portion or the second movable portion;
wherein the photosensitive assembly is fixed on the second movable portion, and the second movable portion is adapted to drive, under the drive of the SMA wires, the photosensitive chip to move in an xoy plane; and
wherein the lens and the photosensitive chip are configured to be simultaneously driven and move in opposite directions; and
wherein the x-axis and the y-axis are coordinate axes perpendicular to an optical axis of the camera module, the x-axis and the y-axis are perpendicular to each other, and the xoy plane is a plane formed by the x-axis and the y-axis.

2. The optical image stabilization camera module according to claim 1 , wherein the second driving part has four corner areas, each corner area is provided with two fixed ends, and the two ends of each SMA wire are fixed and electrically connected to the fixed ends of two adjacent corner areas, respectively.

3. The optical image stabilization camera module according to claim 2 , wherein in any one of the corner areas, the two fixed ends are arranged along a direction of the optical axis.

4. The optical image stabilization camera module according to claim 3 , wherein the four corner areas comprise a first corner, a second corner, a third corner and a fourth corner, wherein the first corner and the third corner are located on a first diagonal line of the second driving part, and the second corner and the fourth corner are located on a second diagonal line of the second driving part;
the second movable portion extends outward at the first corner and the third corner respectively to form a first extension portion and a third extension portion;
the two fixed ends of the first corner of the second driving part are provided on the first extension portion, and the two fixed ends of the third corner of the second driving part are provided on the third extension portion;
the two fixed ends of the second corner of the second driving part are provided at a second corner of the second basic portion, and the two fixed ends of the fourth corner of the second driving part are provided at a fourth corner of the second basic portion;
for each side surface of the second driving part, the two interlaced SMA wires provided on the side surface are fixed and electrically connected to the four fixed ends located in the two corner areas of the side surface;
wherein a translational component of the photosensitive chip in a direction of the first diagonal line or in a direction of the second diagonal line is generated by driving two pairs of interlaced SMA wires on two intersecting side surfaces of the second driving part to shrink; and the translational component in the direction of the first diagonal line is combined with the translational component in the direction of the second diagonal line, so that a movement direction of the photosensitive chip in the xoy plane is opposite to a movement direction of the lens.

5. The optical image stabilization camera module according to claim 4 , wherein rotation of the photosensitive chip in an Rz direction is generated by driving two pairs of interlaced SMA wires on two opposite side surfaces of the second driving part to shrink, wherein the Rz direction is a direction of rotation around a z-axis, and the z-axis is a coordinate axis parallel to the optical axis;
a rotation component of the photosensitive chip in an Rx or Ry direction is generated by driving a single SMA wire on a single side surface of the second driving part to shrink; wherein the Rx direction is a direction of rotation around the x-axis, and the Ry direction is a direction of rotation around the y-axis;
translation of the photosensitive chip in a direction of a z-axis is generated by driving a first group of SMA wires and a second group of SMA wires of the second driving part to shrink; and a translation direction of the photosensitive chip in the z-axis direction is opposite to a translation direction of the lens in the z-axis direction, wherein the z-axis is a coordinate axis parallel to the optical axis;
wherein the first group of SMA wires are two SMA wires with a first common fixed end, and the two SMA wires are located on two intersecting side surfaces of the second driving part, respectively; the second group of SMA wires are the other two SMA wires with a second common fixed end, and the other two SMA wires are located on the other two intersecting sides of the second driving part; and each of the first common fixed end and the second common fixed end is one of eight fixed ends of the second driving part, and the first common fixed end and the second common fixed end are located at the same height.

6. The optical image stabilization camera module according to claim 2 , wherein the four fixed ends of any two adjacent corner areas are all located in a plane parallel to the xoy plane.

7. The optical image stabilization camera module according to claim 2 , wherein the two fixed ends of each corner area comprise a type-A fixed end and a type-B fixed end, wherein the type-A fixed end and the type-B fixed end are at different heights;
the type-A fixed ends located in two diagonal corner areas are at the same height, and the type-B fixed ends located in two diagonal corner areas are also at the same height; each side surface of the second driving part is provided with two SMA wires, wherein the two ends of each SMA wire are connected to one of the type-A fixed ends and one of the type-B fixed ends located in adjacent corner areas, respectively, so that the two SMA wires are interlaced with each other;
the four type-A fixed ends of the four corner areas are at the same height; and the four type-B fixed ends of the four corner areas are at the same height;
the type-A fixed end and the type-B fixed end located in the same corner area are stacked, and the two are separated by an insulating material.

8. The optical image stabilization camera module according to claim 7 , wherein the four corner areas comprise a first corner, a second corner, a third corner and a fourth corner, wherein the first corner and the third corner are located on one diagonal line of the second driving part, and the second corner and the fourth corner are located on the other diagonal line of the second driving part; the second movable portion extends outward at the first corner and the third corner respectively to form a first extension portion and a third extension portion; and the first extension portion is provided with a first A fixed end and a first B fixed end at different heights, and the third extension portion is provided with a third A fixed end and a third B fixed end at different heights;
a second A fixed end and a second B fixed end at different heights are provided at a position of the second corner of the second basic portion; and a fourth A fixed end and a fourth B fixed end at different heights are provided at a position of the fourth corner of the

Assignees

• Ningbo Sunny Opotech Co Ltd

Inventors

• Yuan Dongli
• Wu Hu
• Wei Hangang
• Li Jianhong
• Liu Jia
• Zhang Qiong
• Huang Jianbin

Classifications

• G03B2205/0076

  using shape memory alloys · CPC title

• G03B2205/0007

  Movement of one or more optical elements for control of motion blur · CPC title

• G03B5/00

  Adjustment of optical system relative to image or object surface other than for focusing · CPC title

• G02B27/646

  compensating for small deviations, e.g. due to vibration or shake (movement of one or more optical elements for control of motion blur in cameras, projectors or printers G03B2205/0007; image stabilisation in cameras peculiar to the presence or use of an electronic image sensor H04N23/68) · CPC title

• H04N23/51

  Housings · CPC title