Optical Unit Shake Correction via Open-End Swing Restriction
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Solution Overview
Problem
Optical units with shake correction functions face challenges in restricting the swing range of a movable body when one side of the fixed body is structured as an opened end, leading to potential damage from excessive swinging and a lack of space for a swing restriction mechanism.
Innovation Solution
Incorporating a protruded part on the movable body that extends through the opened end of the fixed body, which abuts with a swing restriction part at the fixed body's opened end to limit the swing range, while maintaining a reduced optical axis direction dimension and allowing efficient assembly without a bottom plate.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of moving object
If a bottom plate is not used to reduce dimension and simplify assembly, then the optical axis direction dimension is reduced and assembly efficiency is improved, but no space is secured for providing a swing restriction member
Solution Approach 1:
The swing restriction part is integrated directly into the structure of the fixed body, merging the restriction function with the housing structure itself rather than being a separate component. This eliminates the need for additional space while maintaining the swing restriction capability.
Solution Approach 2:
Instead of having the swing restriction member protrude inward from the bottom plate, the design inverts the approach by having the protruded part extend outward from the movable body through the opened end, allowing the swing restriction to be achieved at the opening itself without requiring internal space.
2Reliability
If a swing restriction member is provided at a midway position in the optical axis direction, then the swing range can be restricted, but the optical axis direction dimension increases and assembly becomes more complex
Solution Approach 1:
The swing restriction function is moved from a midway position along the optical axis to the terminal opening of the fixed body. This dimensional relocation allows the restriction to occur at the boundary rather than requiring intermediate space, thus reducing the overall optical axis dimension while maintaining reliability.
3Productivity
If the fixed body is provided with an opened end for efficient assembly, then manufacturing efficiency is improved, but the movable body may swing excessively causing damage
Solution Approach 1:
The movable body's own protruded part serves as the swing restriction element by abutting against the swing restriction part of the fixed body. This self-service approach provides swing prevention without requiring separate restriction components, maintaining both assembly efficiency and reliability.
Data Source
AI summary
An optical unit may include a movable body including a holder which holds an optical module on its inner side; a fixed body which swingably supports the movable body through a support mechanism; and a shake correction drive mechanism structured to swing the movable body. An end part on one side in an optical axis direction of the fixed body may be structured to be an opened end. The movable body may include a protruded part which is protruded to the one side in the optical axis direction through the opened end. The fixed body may include a swing restriction part at the opened end which is configured to abut with the protruded part when the movable body is swung to restrict a swing range of the movable body.