Lens Unit Zoom Tracking Control via Self-Contained Data Storage
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Solution Overview
Problem
In image pickup apparatuses, performing zoom tracking control is challenging when various lens units are mounted, as it requires storing unique data for each lens unit, which is difficult to manage effectively.
Innovation Solution
A lens unit with a magnification varying lens and a correction lens, along with a storage unit and controller, communicates with the image pickup apparatus to adjust the correction lens's position based on stored information, ensuring accurate zoom tracking control across different lens units.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If zoom tracking control is performed by storing unique data for each lens unit in the camera body, then accurate zoom tracking control can be achieved, but it becomes difficult to manage and store data for various kinds of lens units
Solution Approach 1:
The patent extracts the lens unit-specific data (zoom tracking data indicating position relations between magnification varying lens and correction lens) from the camera body storage and relocates it to the lens unit itself. This allows the camera body to perform zoom tracking control without needing to store and manage unique data for each lens unit, resolving the data management complexity while maintaining control accuracy.
Solution Approach 2:
The lens unit is made self-sufficient by equipping it with its own storage unit that stores zoom tracking data specific to that lens unit. The lens unit independently manages its own operational data, eliminating the need for the camera body to store and manage data for multiple different lens units, thereby simplifying the overall system's data management complexity.
2Manufacturing precision
If the correction lens is controlled to move in accordance with magnification varying lens movement based on stored position relation data, then accurate zoom tracking control is achieved, but the system requires complex communication and coordination between lens unit and camera body
Solution Approach 1:
The patent implements a feedback mechanism where the lens controller receives control information from the camera body's controller that includes instructions for moving the correction lens based on the magnification varying lens position. The lens controller executes this control while referencing the stored position relation data, creating a closed-loop system that achieves accurate correction lens positioning through coordinated feedback between camera body and lens unit.
Data Source
AI summary
A lens unit L100 is removably mounted on an image pickup apparatus generating control information used for a vibration control that vibrates a correction lens L105 and moves a vibration center of the correction lens L105, includes an image pickup optical system including a magnification varying lens L102 and the correction lens L105, a storage unit storing first information indicating a relation between positions of the magnification varying lens L102 and the correction lens L105, and a lens controller performing a predetermined control in which the correction lens L105 moves in accordance with the movement of the magnification varying lens L102, and the lens controller sends information relating to the magnification varying operation to the image pickup apparatus, and overlaps the vibration control of the correction lens L105 based on the control information in accordance with the information relating to the magnification varying operation with the predetermined control.