Lens Unit Shake Correction Synchronization via Target-Value Adjustment
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Solution Overview
Problem
Existing interchangeable lens camera systems face challenges in image stabilization due to performance differences between shake detection units in the lens and camera body, leading to inadequate shake correction performance.
Innovation Solution
The implementation of a system that includes a shake detector, a shake correction mechanism, and processors to set a correction ratio and adjust shake correction amounts based on the difference between shake detection results from both units, ensuring effective image stabilization by synchronizing the shake correction operations between the lens and camera body.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If shake correction is performed by simultaneously driving multiple shake correction means, then shake correction performance is improved and larger shake can be handled, but time delay occurs due to communication of shake correction amounts between lens and body
Solution Approach 1:
The shake correction function is segmented into two independent systems: a lens-side shake correction system and a body-side shake correction system. Each system operates autonomously with its own shake detection unit and correction mechanism, eliminating the need for continuous communication of correction amounts between lens and body. This segmentation resolves the time delay issue while maintaining effective shake correction through coordinated operation of both systems.
2Reliability
If shake correction amounts are communicated between interchangeable lens and body, then coordinated shake correction is achieved, but phase delay occurs due to communication time
Solution Approach 1:
The system divides shake correction into independent lens-side and body-side operations, each with its own detection and correction loop. This eliminates communication-dependent phase delay while achieving coordinated correction through parallel operation. The lens-side correction handles high-frequency shake and the body-side correction handles low-frequency shake, with both systems operating independently but complementarily.
3Adaptability or versatility
If separate shake detection units are used in lens and body, then independent shake detection is achieved, but performance differences between detection units cause unequal correction ratios
Solution Approach 1:
The system introduces adjustable correction ratio parameters that allow the controller to dynamically adjust the contribution of each shake correction system based on the performance characteristics of the detection units. When performance differences between lens-side and body-side detection units are detected, the correction ratios are modified to compensate, ensuring that both systems contribute appropriately to overall shake correction despite their different capabilities.
4Stability of the object's composition
If communication cycle is slowed down, then system stability is improved, but shake correction responsiveness deteriorates
Solution Approach 1:
By segmenting the shake correction into independent lens-side and body-side systems, each operating with its own control loop, the system eliminates the need for high-speed communication between lens and body. Each segmented system can operate at a stable, slower communication cycle while maintaining responsive shake correction through its independent detection and correction mechanism.
Data Source
AI summary
A lens unit comprises a shake detector; a shake correction mechanism for correcting image blur; a setting unit for setting a ratio of shake to be corrected by the shake correction mechanism; a control unit for, based on the shake detected by the shake detector and the ratio of shake, calculating a first shake correction amount and control an image shake correction operation by the shake correction mechanism; and a target-value correction unit for correcting the first shake correction amount, based on a difference between a result of detecting shake by the shake detector, and a result of detecting shake by a shake detector provided in the imaging device, wherein the control unit controls the shake correction mechanism based on an image stabilization amount corrected in accordance with the target-value correction unit.