Shake Correction Lens Displacement Control
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Solution Overview
Problem
Existing shake correction mechanisms in imaging apparatuses face challenges in effectively addressing both small and large camera shakes, particularly due to limitations in displacement range and aberration correction, which can lead to deteriorated image quality and potential collisions with lens barrel walls.
Innovation Solution
A shake correction device and method that utilizes a filter processing unit to adjust filter characteristics based on displacement state, limiting low-frequency shake correction as the displacement approaches a limit, thereby preventing excessive lens displacement and ensuring effective shake correction across varying shake magnitudes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the correction optical system is largely displaced to correct large camera shake, then shake correction performance for large shake is improved, but the correction optical system may collide with the inside wall of the lens barrel
Solution Approach 1:
The patent applies dynamics by making the displacement range of the correction optical system variable rather than fixed. The control unit dynamically adjusts the displacement range based on the detected shake magnitude: for large shake, a larger displacement range is permitted to correct the shake effectively; for small shake, a limited displacement range is enforced to prevent collision with the lens barrel wall. This dynamic adaptation resolves the contradiction between correction effectiveness and collision prevention.
Solution Approach 2:
The patent changes the parameter of displacement range according to the shake magnitude. When shake is detected to be within a predetermined threshold, the system limits the displacement range to a first range that prevents collision. When shake exceeds the threshold, the system expands the displacement range to a second range that enables effective correction. This parameter change strategy allows the system to optimize performance while avoiding harmful collisions.
2Object-affected harmful factors
If centering force is generated according to lens position to prevent large displacement, then collision with lens barrel wall is prevented, but shake correction performance for large shake deteriorates
Solution Approach 1:
The patent applies local quality by differentiating the control strategy based on the magnitude of camera shake. For small shake (within threshold), centering force is generated to limit displacement and prevent collision. For large shake (exceeding threshold), the system switches to a different control mode that allows larger displacement for effective correction. This localized differentiation of control quality resolves the contradiction between collision prevention and correction performance.
Solution Approach 2:
The control unit dynamically adjusts the generation of centering force based on real-time shake detection. When shake magnitude is within the threshold, centering force is actively generated to constrain the correction optical system. When shake exceeds the threshold, the system dynamically reduces or suspends centering force generation to allow larger displacements. This dynamic control resolves the contradiction by adapting the constraint strength to the operational needs.
3Manufacturing precision
If the displacement range of the correction lens is limited according to focal distance, then aberration is controlled, but shake correction capability for large shake is reduced
Solution Approach 1:
The patent dynamically adjusts the displacement range limit based on the detected shake magnitude rather than using a fixed limit based on focal distance. When shake is small, a limited displacement range is enforced to control aberration. When shake is large, the system temporarily overrides the focal distance-based limitation to allow larger displacement for effective correction. This dynamic override resolves the contradiction between aberration control and correction capability.
Data Source
AI summary
A shake correction device includes a shake detection unit detecting shake so as to generate a shake detection signal, a driving unit displacing a relative positional relationship between a lens unit and an imaging device with respect to an optical axis so as to displace the position on the imaging surface of an optical image formed on an imaging surface of the imaging device, a displacement detection unit detecting a displacement state of the correction lens unit or the imaging device, a filter processing unit performing a filter process of the shake detection signal, and a correction control unit displacing the relative positional relationship between the lens unit and the imaging device according to the filter-processed shake detection signal so as to correct the shake of the optical image on the imaging surface generated by the shake detected by the shake detection unit.