US-12619127-B2 - Optical element driving mechanism

US12619127B2US 12619127 B2US12619127 B2US 12619127B2US-12619127-B2

Abstract

An optical element driving mechanism is used for accommodating a first optical element and includes a fixed assembly, a movable part and a driving assembly. The movable part is configured to connect a second optical element. The second optical element corresponds to the first optical element. The movable part is movable relative to the fixed assembly. The driving assembly is configured to drive the movable part to move relative to the fixed assembly. The fixed assembly includes a first accommodation space configured to accommodate the first optical element.

Inventors

Chia-Che Wu
Chao-Chang Hu
Yu-Chiao LO

Assignees

ACTUTEK CORPORATION

Dates

Publication Date: 20260505
Application Date: 20231027

Claims (19)

1 . An optical element driving mechanism for accommodating a first optical element, comprising: a fixed assembly: a movable part, configured to be connected to a second optical element, wherein the second optical element corresponds to the first optical element, the movable part is movable relative to the fixed assembly, and the second optical element defines an optical axis; and a driving assembly, configured to drive the movable part to move relative to the fixed assembly; wherein the fixed assembly includes a first accommodation space configured to accommodate the first optical element; the fixed assembly further includes a base and an outer frame; the outer frame is fixedly connected to the base and forms the first accommodation space; the fixed assembly further includes a third opening and a fourth opening; the outer frame has a first outer wall and a second outer wall; the third opening is formed on the first outer wall; the fourth opening is formed on the second outer wall; the first outer wall and the second outer wall are parallel to each other; when viewed along the optical axis, the third opening is larger than the second opening; the base includes a base plate which has a plate-shaped structure: the fixed assembly further includes a first supporting portion disposed on the base plate to accommodate the first optical element; and the first optical element is fixedly connected to the first supporting portion of the fixed assembly.
2 . The optical element driving mechanism as claimed in claim 1 , wherein the movable part includes a second accommodation space configured to accommodate the first optical element; the second accommodation space is located in the first accommodation space; the optical axis passes through the second optical element and the first optical element; and when viewed along the optical axis, the movable part has a long strip-shaped structure.
3 . The optical element driving mechanism as claimed in claim 2 , wherein the movable part further includes a first side wall, a second side wall and a first opening; when viewed along the optical axis, the first side wall is located on one side of the first optical element; when viewed along the optical axis, the second side wall is located on other side of the first optical element; when viewed along the optical axis, the first optical element is located between the first side wall and the second side wall; and the first opening corresponds to the first optical element.
4 . The optical element driving mechanism as claimed in claim 3 , wherein the first side wall has a first surface and a second surface, and the second side wall has a third surface and a fourth surface; the first surface is facing the first optical element; the second surface and the first surface are facing opposite directions; the third surface is facing the first optical element; and the fourth surface and the third surface are facing opposite directions.
5 . The optical element driving mechanism as claimed in claim 4 , wherein the first side wall and the second side wall respectively have a first groove and a second groove; the first groove is recessed from the second surface; the second groove is recessed from the fourth surface; the driving assembly includes a first driving element and a second driving element, which are respectively disposed in the first groove and the second groove; the driving assembly further includes a first coil and a second coil, corresponding to the first driving element and the second driving element respectively; the first driving element and the second driving element are configured to drive the movable part to rotate around a first rotation axis, so that a pushing portion of the second optical element pushes a main body of the second optical element to change the optical properties of second optical element; North-pole and South-pole of the first driving element are arranged along the optical axis; and North-pole and South-pole of the second driving element are arranged along the optical axis.
6 . The optical element driving mechanism as claimed in claim 5 , wherein when viewed along a first axis, at least a portion of the first optical element is exposed from the first opening; the first axis is not parallel to the optical axis; the movable part further includes a top wall and a second opening; the top wall is connected between the first side wall and the second side wall; the movable part further includes a first oblique wall which is connected between the top wall and the first side wall; the movable part further includes a second oblique wall which is connected between the top wall and the second side wall; the first oblique wall and the second oblique wall are not parallel to the optical axis and the first axis; and the top wall corresponds to the second optical element.
7 . The optical element driving mechanism as claimed in claim 6 , wherein when viewed along the first axis, the movable part has a U-shaped structure; when viewed along the first axis, the movable part surrounds a portion of the first optical element; the second opening corresponds to the second optical element and is located on the top wall; the second opening is formed on the top wall; the optical axis passes through the second opening; the first side wall further has a third groove; the second side wall further has a fourth groove; the third groove is recessed from the second surface; and the fourth groove is recessed from the fourth surface.
8 . The optical element driving mechanism as claimed in claim 7 , wherein the driving assembly includes a third driving element and a fourth driving element, which are respectively disposed in the third groove and the fourth groove; the driving assembly further includes a third coil and a fourth coil, corresponding to the third driving element and the fourth driving element respectively; the third driving element and the fourth driving element are configured to drive the movable part to rotate around a second rotation axis, so that the pushing portion pushes the main body to change the optical properties of the second optical element; North-pole and South-pole of the third driving element are arranged along the first axis; North-pole and South-pole of the fourth driving element are arranged along the first axis; the first driving element and the third driving element are arranged along the optical axis; and the second driving element and the fourth driving element are arranged along the optical axis.
9 . The optical element driving mechanism as claimed in claim 8 , wherein the third opening corresponds to the second optical element; the third opening corresponds to the first optical element; the fourth opening corresponds to the first optical element; and the first outer wall and the second outer wall each have a plate-shaped structure.
10 . The optical element driving mechanism as claimed in claim 9 , wherein the base further includes a first setting portion and a second setting portion extending from the base plate along the first axis; when viewed along the optical axis, the first supporting portion is located between the first setting portion and the second setting portion; when viewed along the first axis, the first side wall is located between the first setting portion and the first supporting portion; when viewed along the first axis, the second side wall is located between the second setting portion and the first supporting portion; there is a gap between the first surface and the first supporting portion; there is another gap between the second surface and the first setting portion; there is another gap between the third surface and the first supporting portion; and there is another gap between the fourth surface and the second setting portion.
11 . The optical element driving mechanism as claimed in claim 10 , wherein the optical element driving mechanism further includes a circuit assembly which is fixedly disposed on the base of the fixed assembly; the circuit assembly includes a first circuit portion and a second circuit portion, respectively affixed to the first setting portion and the second setting portion; the circuit assembly further includes a third circuit portion which is connected between the first circuit portion and the second circuit portion; the third circuit portion is fixedly connected to a bottom of the base; and the first coil and the second coil are fixedly disposed on the first circuit portion and the second circuit portion respectively.
12 . The optical element driving mechanism as claimed in claim 11 , wherein the first setting portion and the second setting portion respectively form a first accommodating opening and a second accommodating opening; the first coil and the second coil are respectively located in the first accommodating opening and the second accommodating opening; when the first coil and the second coil respectively act with the first driving element and the second driving element to generate a first electromagnetic driving force and a second electromagnetic driving force, the first driving element and the second driving element are configured to drive the movable part to rotate around the first rotation axis; the first rotation axis is parallel to the first axis; and the first electromagnetic driving force and the second electromagnetic driving force are exerted in opposite directions.
13 . The optical element driving mechanism as claimed in claim 12 , wherein the third coil and the fourth coil are respectively and fixedly disposed on the first circuit portion and the second circuit portion; the third coil and the fourth coil are respectively located in the first accommodating opening and the second accommodating opening; the third driving element and the fourth driving element are configured to drive the movable part to rotate around the second rotation axis when the third coil and the fourth coil respectively act with the third driving element and the fourth driving element to generate a third electromagnetic driving force and a fourth electromagnetic driving force; and the third electromagnetic driving force and the fourth electromagnetic driving force are exerted in the same direction.
14 . The optical element driving mechanism as claimed in claim 13 , wherein the optical element driving mechanism further includes a connecting assembly, so that the movable part is movably connected to the fixed assembly through the connecting assembly; the connecting assembly includes a first elastic member and a second elastic member; the first elastic member and the second elastic member respectively have a first flexible portion and a second flexible portion; the first flexible portion has flexibility; the second flexible portion has flexibility; when viewed along the optical axis, the first flexible portion and the first optical element are arranged along a second axis; the second axis is not parallel to the first axis; and the second rotation axis is parallel to the second axis.
15 . The optical element driving mechanism as claimed in claim 14 , wherein when viewed along the optical axis, a longitudinal axis of the movable part having a long strip-shaped structure is parallel to the second axis; when viewed along the optical axis, the first flexible portion and the second flexible portion are arranged along the second axis; when viewed along the optical axis, a center of the second optical element is located between the first flexible portion and the second flexible portion; when viewed along the optical axis, the first rotation axis is located between the first flexible portion and the second flexible portion; and when viewed along the optical axis, the second rotation axis passes through the first flexible portion and the second flexible portion.
16 . The optical element driving mechanism as claimed in claim 15 , wherein the first elastic member has a first connecting end which is fixedly connected to the fixed assembly; the first connecting end is affixed to a first setting portion; the first elastic member further has a second connecting end which is fixedly connected to the movable part; the first flexible portion is connected between the first connecting end and the second connecting end; the second elastic member has a third connecting end which is fixedly connected to the fixed assembly; the third connecting end is affixed to a second setting portion; the second elastic member further has a fourth connecting end which is fixedly connected to the movable part; the second flexible portion is connected between the third connecting end and the fourth connecting end; when viewed along the optical axis, the first setting portion, the second optical element and the second setting portion are arranged along the second axis; and when viewed along the optical axis, the optical element driving mechanism does not include any flexible portion arranged with the second optical element along the first axis.
17 . The optical element driving mechanism as claimed in claim 16 , wherein the first optical element and the second optical element have different materials; the first optical element and the second optical element have different material states; the second optical element is a liquid lens; the first optical element includes a solid lens; the second optical element includes an optical fixed portion; the optical fixed portion is fixedly connected to the fixed assembly; the optical fixed portion is affixed to the fixed assembly by laser welding; the optical axis passes through the main body; the pushing portion is fixedly connected to the movable part; the pushing portion has a ring-shaped structure; and when viewed along the optical axis, the optical fixed portion overlaps at least a portion of the connecting assembly.
18 . The optical element driving mechanism as claimed in claim 10 , wherein the optical element driving mechanism further includes a circuit assembly which is fixedly disposed on the base of the fixed assembly; the circuit assembly includes a first circuit portion and a second circuit portion, respectively affixed to the first setting portion and the second setting portion; and the first coil and the second coil are fixedly disposed on the first circuit portion and the second circuit portion respectively.
19 . The optical element driving mechanism as claimed in claim 18 , wherein the first setting portion and the second setting portion respectively form a first accommodating opening and a second accommodating opening; the first coil and the second coil are respectively located in the first accommodating opening and the second accommodating opening; when the first coil and the second coil respectively act with the first driving element and the second driving element to generate a first electromagnetic driving force and a second electromagnetic driving force, the first driving element and the second driving element are configured to drive the movable part to move along the optical axis; and the first electromagnetic driving force and the second electromagnetic driving force are exerted in the same directions.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Application No. 63/420,236, filed Oct. 28, 2022, the entirety of which is incorporated by reference herein. BACKGROUND OF THE INVENTION Field of the Disclosure The present disclosure relates to an optical element driving mechanism, and in particular it relates to an optical element driving mechanism with a long focal length and anti-shake function. Description of the Related Art As technology has developed, many of today's electronic devices (such as smartphones) have a camera and video-recording functionality. Using the camera modules disposed in electronic devices, users can operate their electronic devices to capture photographs and record videos. Today's design of electronic devices continues to follow the trend of miniaturization, meaning that the various components of the camera module and its structure must also be continuously reduced in size, so as to achieve miniaturization. In general, the driving mechanism in a camera module has a camera lens holder configured to hold a camera lens, and the driving mechanism can perform the functions of auto focusing and optical image stabilization. However, although existing driving mechanisms can achieve the aforementioned functions of photography and video recording, they still cannot meet all of the users' needs. Therefore, how to design a camera module capable of performing autofocus, optical anti-shake functions and achieving miniaturization at the same time are topics nowadays that need to be discussed and solved. BRIEF SUMMARY OF THE INVENTION Accordingly, one objective of the present disclosure is to provide an optical element driving mechanism to solve the above problems. According to some embodiments of the disclosure, an optical element driving mechanism is provided for accommodating a first optical element and including a fixed assembly, a movable part and a driving assembly. The movable part is configured to connect a second optical element, the second optical element corresponds to the first optical element, and the movable part is movable relative to the fixed assembly. The driving assembly is configured to drive the movable part to move relative to the fixed assembly. The fixed assembly includes a first accommodation space configured to accommodate the first optical element. According to some embodiments, the movable part includes a second accommodation space configured to accommodate the first optical element. The second accommodation space is located in the first accommodation space. The second optical element defines an optical axis. The optical axis passes through the second optical element and the first optical element. When viewed along the optical axis, the movable part has a long strip-shaped structure. According to some embodiments, the movable part further includes a first side wall, a second side wall and a first opening. When viewed along the optical axis, the first side wall is located on one side of the first optical element. When viewed along the optical axis, the second side wall is located on other side of the first optical element. When viewed along the optical axis, the first optical element is located between the first side wall and the second side wall. The first opening corresponds to the first optical element. According to some embodiments, the first side wall has a first surface and a second surface, and the second side wall has a third surface and a fourth surface. The first surface is facing the first optical element. The second surface and the first surface are facing opposite directions. The third surface is facing the first optical element. The fourth surface and the third surface are facing opposite directions. According to some embodiments, the first side wall and the second side wall respectively have a first groove and a second groove. The first groove is recessed from the second surface. The second groove is recessed from the fourth surface. The driving assembly includes a first driving element and a second driving element, which are respectively disposed in the first groove and the second groove. The first driving element and the second driving element are configured to drive the movable part to rotate around a first rotation axis, so that a pushing portion of the second optical element pushes a main body of the second optical element to change the optical properties of second optical element. North-pole and South-pole of the first driving element are arranged along the optical axis. North-pole and South-pole of the second driving element are arranged along the optical axis. According to some embodiments, when viewed along a first axis, at least a portion of the first optical element is exposed from the first opening. The first axis is not parallel to the optical axis. The movable part further includes a top wall and a second opening. The top wall is connected between the first side wall and the second side wall. The