Zoom Tracking Control Cycle for Interchangeable Lens Focus
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Solution Overview
Problem
Existing imaging apparatuses face challenges in maintaining accurate focus tracking during high-speed zoom operations, particularly when recording high-definition moving images, due to delays in zoom tracking control cycles that result in out-of-focus images.
Innovation Solution
The imaging apparatus performs zoom tracking control in a cycle shorter than the synchronizing signal cycle by determining the focus position of the focus lens based on the position of the zoom lens using stored relation information, allowing for precise control of the focus lens driver to maintain an in-focus state.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zoom tracking control is performed in the same cycle as the synchronizing signal cycle, then the control system operates synchronously with the imaging unit, but the focus tracking accuracy deteriorates during high-speed zoom operations due to control delays
Solution Approach 1:
The patent applies dynamics by making the zoom tracking control cycle adaptive rather than fixed. The controller dynamically adjusts the control cycle to be shorter than the synchronizing signal cycle during high-speed zoom operations, allowing the system to respond more quickly to zoom changes while maintaining synchronization during normal operations. This dynamic adjustment resolves the contradiction by enabling both synchronization reliability and focus tracking accuracy under different operating conditions.
Solution Approach 2:
The patent changes the time parameter of the control cycle to resolve the contradiction. By allowing the zoom tracking control cycle to be shorter than the synchronizing signal cycle, the system can perform more frequent focus adjustments during zoom operations without losing synchronization with the imaging unit. This parameter change enables the system to maintain both synchronization reliability and focus tracking accuracy simultaneously.
2Measurement precision
If the zoom tracking control cycle is shortened to improve focus tracking accuracy, then the focus positioning precision improves, but the complexity of the control system increases
Solution Approach 1:
The patent applies preliminary action by pre-storing the relationship information between zoom lens positions and corresponding focus lens positions in a storage unit. This allows the controller to quickly determine the required focus position without complex real-time calculations, thereby improving focus positioning precision while minimizing control system complexity. The preliminary preparation of position relationship data eliminates the need for complex algorithms during actual zoom operations.
3Reliability
If the focus lens is adjusted more frequently during zoom operations, then the in-focus state is maintained more accurately, but the response time requirement increases
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing the relationship between zoom lens positions and corresponding focus lens positions. This allows the controller to immediately determine the correct focus position when a zoom change occurs, eliminating the need for time-consuming real-time calculations. The focus lens can be adjusted more frequently and accurately without increasing response time requirements because the position relationships are already established in advance.
Data Source
AI summary
An imaging apparatus including an exchangeable lens and a camera body. The camera body transmits a synchronizing signal having the same cycle as the cycle of the capturing operation in the imaging unit, to the interchangeable lens. The controller of the exchangeable lens performs a zoom tracking control by determining the focus position of the focus lens from the position of the zoom lens detected by the position detector by referring to the relation information, and controlling the focus lens driver to move the focus lens to the determined focus position, The controller performs the zoom tracking control in a cycle (for example, one-eighth) shorter than a cycle indicated by the synchronizing signal received from the camera body.