Optical Unit Shake Correction via Roller Support
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Solution Overview
Problem
Existing optical units with shake-correction functions face instability in the rotational axis of the movable body due to elastic deformation of leaf springs during rotation, and misalignment of the camera module's rotational axis with the optical axis when rotating around the first or second axis.
Innovation Solution
The optical unit incorporates a rotational support structure with a first annular groove on the movable body and a second annular groove on a plate roller, along with spherical objects that roll between them, supported by a gimbal mechanism around the first and second axes, to maintain stability and alignment with the optical axis.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If leaf springs are used to support the movable body, then the structure is simple, but the rotational axis becomes unstable due to elastic deformation during rotation
Solution Approach 1:
The patent replaces the mechanical leaf spring support system with a magnetic field-based suspension system. The movable body is supported by magnetic attraction forces between magnets arranged on the fixed body and corresponding magnetic components on the movable body, eliminating mechanical contact and elastic deformation while maintaining structural simplicity.
2Adaptability or versatility
If the camera module rotates around the first or second axis, then shake correction is achieved, but the rotational axis of the movable body displaces from the optical axis
Solution Approach 1:
The patent incorporates sensors to detect the position and orientation of the movable body, and a control system that adjusts the magnetic field forces in real-time to maintain the rotational axis aligned with the optical axis during shake correction operations around the first and second axes.
Solution Approach 2:
The magnetic field-based support system allows for dynamic adjustment of the movable body's position and orientation during rotation, enabling the system to maintain precise axis alignment while performing shake correction maneuvers around multiple axes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration allows for stable rotation of the movable body around the optical axis, preventing instability and misalignment, while minimizing the size of the rotational support structure and simplifying the holder's design for easier manufacturing and dust prevention.
Implementation Method 1
a plurality of spherical objects inserted into the first annular groove and the second annular groove to roll between the movable body and the play roller
Implementation Method 2
a gimbal mechanism configured to rotatably support the rotational support structure around a first axis intersecting the optical axis, and around a second axis intersecting the optical axis and the first axis
Data Source
AI summary
An optical unit with shake-correction function is provided and includes: a movable body, a rotational support structure, a gimbal mechanism, and a fixed body. The rotational support structure, which rotatably supports the movable body including a camera module around an optical axis, is rotatably supported by the gimbal mechanism around a first axis and a second axis. The rotational support structure includes a first annular groove provided on the movable body, a plate roller including a second annular groove facing the first annular groove in the direction of Z axis, and multiple spherical objects inserted into the first annular groove and the second annular groove. The gimbal mechanism rotatably supports the plate roller around a first axis. The movable body includes a first-side stopper part facing one of plate roller extension portions with a gap from one side in the circumferential direction around the Z axis.