Single-Layer OIS Actuator for Compact Three-Axis Rotation
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Solution Overview
Problem
Existing camera systems face challenges in achieving three-axis rotation for optical image stabilization (OIS) without increasing the overall size due to layered structures, and there is a need for a single-layer mechanism that can detect three-dimensional rotational positions accurately.
Innovation Solution
A three-axis rotation actuator with a single-layer structure that uses magnets for both driving and position detection, combined with a sliding mechanism and suction elements, allows for three-axis rotation without relying on layered components, and incorporates a controller for precise orientation compensation using gyrosensor data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a layered structure is used to achieve three-axis rotation for OIS, then the rotation functionality is improved, but the device size increases
Solution Approach 1:
The patent combines multiple functions into a single layer: the camera module serves as both the object to be rotated and the position detection mechanism, eliminating the need for separate detection layers. The drive holder with spherical portion integrates the rotation mechanism and position detection in one structure, achieving three-axis rotation without increasing device volume through layered construction.
2Quantity of substance
If magnets are used for both driving and position detection, then the quantity of parts is reduced, but the manufacturing precision requirement increases
Solution Approach 1:
The magnets mounted on the camera module serve dual purposes: they generate magnetic force for driving rotation through interaction with driving coils, and simultaneously serve as position detection targets for detection sensors. This multi-functional design reduces the total number of parts while requiring precise positioning of the magnets to ensure both driving and detection functions operate correctly.
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
The actuator achieves compact size and high-precision OIS by simultaneously calculating three-axis angular velocities, reducing the number of parts and preventing crosstalk, ensuring stable image capture despite camera movement.
Implementation Method 1
one or more suction magnets or one or more suction yokes are attached to the bottom part; a base having a receiving surface with a shape corresponding to the generally spherical portion of the bottom part of the drive holder, wherein the receiving surface has one or more suction yokes for attracting the suction magnets or one or more suction magnets for attracting the suction yokes
Implementation Method 2
at least three driving coils fixed with respect to the base, respectively paired with the magnets for driving and position detection provided on the at least three sides of the camera module, for driving the camera module for three-axis rotation
Implementation Method 3
detection sensors fixed with respect to the base, respectively arranged at locations facing the magnets for driving and position detection provided on the at least three sides of the camera module, for detecting positions of the respective magnets for driving and position detection
Data Source
AI summary
An actuator includes: a camera module having magnets provided on at least three sides of the four sides of the camera module; a drive holder has a bottom part, and one or more suction magnets or suction yokes are attached to the bottom part; a base having a receiving surface which has one or more suction yokes or suction magnets, and wherein the receiving surface and the bottom part of the drive holder form a sliding mechanism configured to constrain movement of the camera module; at least three driving coils fixed with respect to the base, respectively paired with the magnets for driving and position detection provided on the at least three sides of the camera module; and detection sensors fixed with respect to the base, respectively arranged at locations facing the magnets for driving and position detection provided on the at least three sides of the camera module.