Optical element driving mechanism

Patent metadata

Field	Value
Publication number	US-10914870-B2
Application number	US-201916257506-A
Country	US
Kind code	B2
Filing date	Mar 27, 2019
Priority date	Jan 25, 2018
Publication date	Feb 9, 2021
Grant date	Feb 9, 2021

Abstract

The present invention relates to an optical element driving mechanism, including a base, a holder, a frame and a light intensity adjusting assembly. The holder is movably connected to the base and carries the optical element, wherein the optical element has an opening and an optical axis so that light passes through the opening to the optical element. The frame is connected to the holder and the base. The light intensity adjusting assembly is disposed on the frame. The light intensity adjusting assembly includes a first shutter, a second shutter and a shutter driving member. The second shutter is disposed between the first shutter and the frame. The shutter driving member is disposed between the second shutter and the frame to drive the first shutter and the second shutter.

First claim

What is claimed is:

1. An optical element driving mechanism, comprising:
a base;
a holder, movably connected to the base and carrying an optical element, wherein the optical element has an opening and an optical axis so that light passes through the opening to the optical element;
a frame, connected to the holder and the base, comprising a first shaft and a second shaft;
a light intensity adjusting assembly, disposed on the frame, comprising:
a first shutter;
a second shutter, disposed between the first shutter and the frame; and
a shutter driving member, disposed between the second shutter and the frame to drive the first shutter and the second shutter,
wherein the shutter driving member comprises:
a first magnetic element, wherein the first magnetic element is passed through by the first shaft;
a second magnetic element, wherein the second magnetic element is passed through by the second shaft; and
a magnetic permeable element, disposed between the first magnetic element and the second magnetic element; and
wherein when a current is not supplied to the shutter driving member, the first magnetic element attracts the magnetic permeable element such that the first shutter is located at a first beginning position where the first shutter is not overlapped with the optical element when observing along the optical axis.

2. The optical element driving mechanism as claimed in claim 1 , wherein the shutter driving member drives the first shutter to moving between the first beginning position and a first final position,
when the first shutter is located at the first beginning positon, the first shutter is not overlapped with the optical element when observing along the optical axis;
when the first shutter is located at the first final position, the first shutter is partially overlapped with the optical element with observing along the optical axis.

3. The optical element driving mechanism as claimed in claim 2 , wherein the shutter driving member drives the second shutter to move between a second beginning position and a second final position,
when the second shutter is located at the second beginning position, the second shutter is not overlapped the optical element when observing along the optical axis;
when the second shutter is located at the second final position, the second shutter is partially overlapped with the optical element when observing along the optical axis.

4. The optical element driving mechanism as claimed in claim 3 , wherein the light intensity adjusting assembly further comprises a top cover, located above the first shutter to restrict the first shutter to move between the first beginning position and the first final position, and to restrict the second shutter to move between the second beginning position and the second final position.

5. The optical element driving mechanism as claimed in claim 4 , wherein the light intensity adjusting assembly further comprises a first stop mechanism and a second stop mechanism to restrict the first shutter to move between the first beginning position and the first final position, and to restrict the second shutter to move between the second beginning position and the second final position.

6. The optical element driving mechanism as claimed in claim 5 , wherein when the current is not supplied to the shutter driving member, the second magnetic element attracts the magnetic permeable element such that the second shutter is located at the second beginning position.

7. The optical element driving mechanism as claimed in claim 1 , wherein the magnetic permeable element extends along an extending direction perpendicular to the optical axis, and the center of the magnetic permeable element is not overlapped with the first shaft and the second shaft when observing along the extending direction.

8. The optical element driving mechanism as claimed in claim 1 , wherein the light intensity adjusting assembly further comprises a supporting plate, located between the second shutter and the optical element.

9. The optical element driving mechanism as claimed in claim 1 , further comprising an optical element stop member, disposed on the frame to restrict the range of movement of the holder.

10. The optical element driving mechanism as claimed in claim 1 , wherein the first shutter has a first blocking part and a first extending part, wherein the first blocking part has a diameter greater than a distance between two sides of the first extending part, wherein the two sides has a feature of side cut.

11. The optical element driving mechanism as claimed in claim 1 , wherein the second shutter has a second blocking part and a second extending part, wherein the second blocking part has a diameter greater than a distance between two sides of the second extending part, wherein the two sides has a feature of side cut.

12. An optical element driving mechanism, comprising:
a base;
a holder, movably connected to the base and carrying an optical element, wherein the optical element has an opening and an optical axis so that light passes through the opening to the optical element;
a frame, connected to the holder and the base comprising:
a light intensity adjusting assembly, disposed on the frame, comprising:
a first shutter;
a second shutter, disposed between the first shutter and the frame;
a third shutter, disposed opposite to the first shutter and the second shutter;
a fourth shutter, disposed between the third shutter and the frame; and
a plurality of shutter driving members, disposed between the second shutter and the frame and between the fourth shutter and the frame to drive the first shutter, the second shutter, the third shutter and the fourth shutter,
wherein each of the plurality of shutter driving members comprises:
a first magnetic element, wherein the first magnetic element is passed through by the first shaft;
a second magnetic element, wherein the second magnetic element is passed through by the second shaft; and
a magnetic permeable element, disposed between the first magnetic element and the second magnetic element; and
wherein when a current is not supplied to one of the plurality of shutter driving members, the first magnetic element attracts the magnetic permeable element such that one of the first shutter, the second shutter, the third shutter, and the fourth shutter is located at a beginning position where the shutter is not overlapped with the optical element when observing along the optical axis.

13. The optical element driving mechanism as claimed in claim 12 , wherein the first shutter, the third shutter and the fourth shutter are provided with openings with different size.

14. The optical element driving mechanism as claimed in claim 12 , wherein one of the shutter driving members drives the first shutter to moving between a first beginning position and a first final position,
when the first shutter is located at the first beginning position, the first shutter is not overlapped with the optical element when observing along the optical axis;
when the first shutter is located at the first final position, the first shutter is partially overlapped with the optical element when observing along the optical axis;
wherein one of the shutter driving members drives the second shutter to move between a second beginning position and a second final position,
when the second shutter is located at the second beginning position, the second shutter is not overlapped the optical element when observing along the optical axis;
when the second shutter is located at the second final position, the second shutter is partially overlapped with the optical element when o

Assignees

• Tdk Taiwan Corp

Inventors

• Yu Shiang-Ming
• Tsai Kuen-Wang
• Hu Chao-Chang
• Weng Chih-Wei
• SONG Sin-Jhong

Classifications

• G03B13/32

  Means for focusing · CPC title

• G02B26/004 Primary

  based on a displacement or a deformation of a fluid · CPC title

• G02B7/04

  with mechanism for focusing or varying magnification · CPC title

• H04N23/57

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

• H04N23/45

  for generating image signals from two or more image sensors being of different type or operating in different modes, e.g. with a CMOS sensor for moving images in combination with a charge-coupled device [CCD] for still images · CPC title