US-12619068-B2 - Optical element driving mechanism

US12619068B2US 12619068 B2US12619068 B2US 12619068B2US-12619068-B2

Abstract

An optical element driving mechanism is provided in the present disclosure. The optical element driving mechanism includes a fixed portion, a movable portion, a driving assembly and a first connecting assembly. The movable portion is connected to an optical element. The movable portion moves relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion. The movable portion is movably connected to the fixed portion via the first connecting assembly.

Inventors

Yi-Ho Chen
Chao-Chang Hu
MAO-KUO HSU
Shu-Shan Chen
Chih-Wei Weng
Kai-Jing FU
Sung-Mao Tsai

Assignees

ACTUTEK CORPORATION

Dates

Publication Date: 20260505
Application Date: 20210305

Claims (18)

1 . An optical element driving mechanism, comprising: a fixed portion; a movable portion, connected to an optical element, moving relative to the fixed portion; a driving assembly, driving the movable portion to move relative to the fixed portion; and a first connecting assembly, wherein the movable portion is movably connected to the fixed portion via the first connecting assembly; wherein the movable portion comprises: a frame; a holder, connected to the optical element, moving relative to the frame; and a second connecting assembly, wherein the holder is movably connected to the frame via the second connecting assembly; wherein the first connecting assembly has a strip structure extending along a first direction; wherein the second connecting assembly has a strip structure extending along a second direction; wherein the first connecting assembly has a structure that is wide at both ends and narrow in the middle in the first direction; wherein the second connecting assembly has a structure that is wide at both ends and narrow in the middle in the second direction; wherein the frame comprises a side portion and a protruding portion; wherein the side portion is connected to the protruding portion; wherein the protruding portion is connected to the second connecting assembly; wherein the side portion overlaps the second connecting assembly and the side portion does not overlap the protruding portion when viewed along the first direction; wherein the side portion has a first surface that faces away from the holder, and the first surface is parallel to the first direction; wherein the protruding portion has a second surface that faces the holder and is directly connected to the second connecting assembly, and the second connecting assembly extends from the second surface along the second direction; wherein the protruding portion protrudes from the first surface away from the holder; and wherein the side portion extends in the first direction.
2 . The optical element driving mechanism as claimed in claim 1 , wherein the movable portion has a first resonant frequency relative to the fixed portion, and the holder has a second resonant frequency relative to the frame, wherein the first resonant frequency and the second resonant frequency are different.
3 . The optical element driving mechanism as claimed in claim 2 , wherein the first direction is not parallel to the second direction, and the largest dimension of the first connecting assembly in the first direction is different from the largest dimension of the second connecting assembly in the second direction.
4 . The optical element driving mechanism as claimed in claim 3 , wherein the first direction is perpendicular to the second direction, and the largest dimension of the first connecting assembly in the first direction is greater than the largest dimension of the second connecting assembly in the second direction.
5 . The optical element driving mechanism as claimed in claim 3 , further comprising a control assembly, wherein the control assembly outputs a first driving signal and a second driving signal, wherein the driving assembly comprises: a first driving element, comprising: a first magnetic unit with a polygonal strip structure, extending along the first direction; and a first coil receiving the first driving signal and the second driving signal; wherein the first coil receives the first driving signal, so that the driving assembly drives the movable portion to move relative to the fixed portion in a first dimension, and wherein the first coil receives the second driving signal, so that the driving assembly drives the holder to move relative to the frame in a second dimension; wherein the first dimension is different from the second dimension.
6 . The optical element driving mechanism as claimed in claim 5 , wherein a movement in the first dimension is a rotation about a first rotation axis, and a movement in the second dimension is a rotation about a second rotation axis.
7 . The optical element driving mechanism as claimed in claim 6 , wherein the first rotation axis is parallel to the first direction, and the second rotation axis is parallel to the second direction.
8 . The optical element driving mechanism as claimed in claim 6 , wherein the first driving signal comprises: a first signal, received by the first coil, driving the movable portion to perform a first rotation about the first rotation axis relative to the fixed portion; and a second signal, received by the first coil, driving the movable portion to perform a second rotation about the first rotation axis relative to the fixed portion; wherein the absolute value of the angular velocity of the first rotation is different from the absolute value of the angular velocity of the second rotation.
9 . The optical element driving mechanism as claimed in claim 8 , wherein the absolute value of the angular velocity of the first rotation is less than the absolute value of the angular velocity of the second rotation.
10 . The optical element driving mechanism as claimed in claim 5 , wherein the frequency of the second driving signal is equal to the second resonant frequency.
11 . The optical element driving mechanism as claimed in claim 5 , further comprising a main axis perpendicular to a first axis through the first connecting element in the first direction and a second axis through the second connecting element in the second direction, wherein when viewed along the main axis, a first connecting line is formed between the first magnetic unit or the first coil and the main axis, wherein the first connecting line is not parallel to the first direction or the second direction.
12 . The optical element driving mechanism as claimed in claim 5 , wherein the first coil receives the first driving signal and the second driving signal at the same time, so that the driving assembly drives the movable portion to move in the first dimension relative to the fixed portion and the holder to move in the second dimension relative to the frame at the same time.
13 . The optical element driving mechanism as claimed in claim 5 , wherein the driving assembly further comprises: a second driving element, comprising: a second magnetic unit with a polygonal strip structure, extending along the first direction; and a second coil receiving the first driving signal and the second driving signal.
14 . The optical element driving mechanism as claimed in claim 1 , further comprising an emission element emitting a light ray to the optical element connected to the holder; wherein the light ray is affected by the movement of the optical element and changes a travelling direction when the holder is driven by the driving assembly to move relative to the frame.
15 . The optical element driving mechanism as claimed in claim 14 , wherein the optical element comprises a reflecting mirror.
16 . The optical element driving mechanism as claimed in claim 1 , further comprising a first damping element limiting the movement of the movable portion relative to the fixed portion, wherein the first damping element is in direct contact with the first connecting assembly.
17 . The optical element driving mechanism as claimed in claim 16 , further comprising a second damping element limiting the movement of the holder relative to the frame, wherein the second damping element is in direct contact with the second connecting assembly.
18 . An optical system, comprising: a plurality of optical element driving mechanisms as claimed in one of the preceding claims , wherein the optical element driving mechanisms are arranged along a third direction, wherein each of the optical element driving mechanisms outputs a piece of information; and a calculating unit, integrating multiple pieces of information output by the optical element driving mechanisms into an integrated information, wherein the scope of the integrated information is greater than the scope of any one of the information.

Description

CROSS REFERENCE TO RELATED APPLICATIONS This application claims the benefit of U.S. Provisional Application No. 62/986,039 filed Mar. 6, 2020, the entirety of which is incorporated by reference herein. BACKGROUND OF THE INVENTION Field of the Invention The present invention relates to an optical element driving mechanism, and, in particular, to an optical element driving mechanism for spatial sensing. Description of the Related Art As technology has developed, it has become more common to include spatial sensing functions into many types of modern electronic devices, such as smartphones, gaming devices, household appliances, vehicle electric appliances, etc. Traditionally, the spatial sensing device may include a light source generator for emitting a point light source. A two-dimensional light zone is generated by arranging multiple light source generators in a row and move them at the same time. The light zone reflects on an object, then the reflected rays are received by the spatial sensing device for indicating the distance of the object. Alternatively, the point light source is converted into a linear light beam by a first reflecting device, then the light beam is distributed by a second reflecting device in a direction perpendicular to the direction that the light beam extends. After being converted twice, the point light source may be converted into a light zone. However, while electronic devices these days are increasingly miniaturized, the traditional spatial sensing devices mentioned above are not advantageous for configuration inside such a small electronic device. Thus, the present disclosure provides an optical element driving mechanism that may simultaneously achieve both spatial sensing with a larger range and miniaturization. BRIEF SUMMARY OF THE INVENTION An optical element driving mechanism is provided in the present disclosure. The optical element driving mechanism includes a fixed portion, a movable portion, a driving assembly and a first connecting assembly. The movable portion is connected to an optical element. The movable portion moves relative to the fixed portion. The driving assembly drives the movable portion to move relative to the fixed portion. The movable portion is movably connected to the fixed portion via the first connecting assembly. In accordance with some embodiments of the present disclosure, the movable portion includes a frame, a holder, and a second connecting assembly. The holder is connected to the optical element, moving relative to the frame. The holder is movably connected to the frame via the second connecting assembly. In some embodiments, the movable portion has a first resonant frequency relative to the fixed portion, and the holder has a second resonant frequency relative to the frame. The first resonant frequency and the second resonant frequency are different. In accordance with some embodiments of the present disclosure, the first connecting assembly has a strip structure extending along a first direction; the second connecting assembly has a strip structure extending along a second direction. The first direction is not parallel to the second direction, and the largest dimension of the first connecting assembly in the first direction is different from the largest dimension of the second connecting assembly in the second direction. In some embodiments, the first direction is perpendicular to the second direction, and the largest dimension of the first connecting assembly in the first direction is greater than the largest dimension of the second connecting assembly in the second direction. In accordance with some embodiments of the present disclosure, the optical element driving mechanism further includes a control assembly outputting a first driving signal and a second driving signal. The driving assembly includes a first driving element. The first driving element includes a first magnetic unit with a polygonal strip structure and a first coil. The first magnetic unit extends along the first direction. The first coil receives the first driving signal and the second driving signal. The first coil receives the first driving signal, so that the driving assembly drives the movable portion to move relative to the fixed portion in a first dimension. The first coil receives the second driving signal, so that the driving assembly drives the holder to move relative to the frame in a second dimension. The first dimension is different from the second dimension. In some embodiments, a movement in the first dimension is a rotation about a first rotation axis, and a movement in the second dimension is a rotation about a second rotation axis. In some embodiments, the first rotation axis is parallel to the first direction, and the second rotation axis is parallel to the second direction. In accordance with some embodiments of the present disclosure, the first driving signal includes a travelling signal and a return signal. The travelling signal is received by the first