Focus Lens Position Registration Across Lens Changes
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Solution Overview
Problem
Existing focus control systems fail to maintain or cancel focus lens position registrations accurately during lens replacement and power cycling, leading to incorrect focus position guides that do not follow user intention.
Innovation Solution
An image capturing apparatus with a recording unit, acquisition unit, and control unit to record, identify, and display focus lens positions, allowing for manual focus control assistance by registering and displaying focus lens positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If the lens barrel is detached and reattached after power cycling, then the focus lens position is automatically restored to the previous setting, but this causes incorrect focus position guides to be displayed that do not follow the user's intention
Solution Approach 1:
The patent extracts the focus position data storage function from the camera body and places it in the lens barrel's non-volatile memory. This allows the lens barrel to independently maintain its focus position settings even when detached from the camera body, solving the problem of incorrect focus position restoration after lens replacement and power cycling.
Solution Approach 2:
The patent implements a feedback mechanism where the camera body reads the focus position data from the lens barrel's non-volatile memory upon reattachment, and the focus position guide display is updated to reflect the actual current focus position. This feedback loop ensures that the displayed focus position guide accurately follows the user's intended focus position even after lens replacement.
2Stability of the object's composition
If preset position data is stored in non-volatile memory of the lens barrel, then the focus position can be maintained during lens replacement, but the system cannot adapt to different shooting situations requiring cancellation of registrations
Solution Approach 1:
The patent introduces dynamic control over the stored focus position data by enabling the camera body to determine whether to read and apply the preset position data from the lens barrel's non-volatile memory. The control unit can flexibly decide to use the registered focus position or cancel the registration based on the current shooting situation, making the system adaptable to different operational requirements while maintaining stability through non-volatile storage.
Data Source
AI summary
An image capturing apparatus comprises: an operation member used to move a position of focus lens included in an attached optical system; a recording unit that records the position of the focus lens as an index value in a memory in association with information of the attached optical system including the focus lens in response to a registration instruction; an acquisition unit that acquires information for identifying the attached optical system; a readout unit that, if there is an index value recorded in association with the information of the attached optical system corresponding to the information acquired by the acquisition unit, reads out the index value from the memory; and a control unit that controls a display device to display the read index value and a current position of the focus lens.