Movable Lens Unit Control for Stable Angle of View During Focus
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Solution Overview
Problem
Conventional zoom lenses experience unintended changes in optical performance, such as angle of view, due to focus operations without simultaneous zoom adjustments.
Innovation Solution
A lens apparatus with multiple movable lens units, driving units, and a control unit that sets loci and controls the movement of these units based on user-selected optical performance targets to minimize unintended optical changes during focus and zoom operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a focus lens is driven to perform a focus operation, then focus performance is improved, but angle of view changes unintentionally
Solution Approach 1:
The control unit calculates and applies a compensatory zoom operation that counteracts the angle of view change caused by the focus operation. By performing this preliminary counter-action, the system prevents the unintended angle of view change before it affects the final image, thereby maintaining both focus performance and angle of view stability
Solution Approach 2:
The system uses feedback control by continuously monitoring the angle of view change caused by focus lens movement and adjusting the zoom lens position accordingly. The control unit calculates the required compensatory zoom amount based on the actual angle of view deviation, creating a closed-loop control system that maintains angle of view stability while preserving focus performance
2Ease of operation
If both focus lens and zoom lens are driven simultaneously to suppress angle of view change, then angle of view stability is improved, but device complexity increases
Solution Approach 1:
The control unit dynamically adjusts the driving parameters of the zoom lens based on the focus operation characteristics. By calculating the appropriate zoom driving amount as a function of focus lens position and movement amount, the system achieves angle of view stability through parameter optimization rather than complex mechanical structures
Solution Approach 2:
The control unit acts as an intermediary that coordinates between the focus operation and zoom operation. It processes the focus drive information, calculates the necessary compensatory zoom action, and generates the appropriate zoom drive commands, thereby simplifying the overall control architecture while achieving stable angle of view
3Reliability
If multiple lens units are controlled with precise loci to minimize unintended optical changes, then optical performance consistency is improved, but manufacturing precision requirements increase
Solution Approach 1:
The control unit pre-calculates the optimal loci for each lens unit before the actual focusing or zooming operation begins. By determining the precise movement paths in advance based on the desired optical performance targets, the system guides the lens units along predetermined trajectories that minimize unintended optical changes, reducing the burden on manufacturing precision
4Productivity
If lens units are moved along calculated loci based on target optical performance values, then productivity is improved, but device complexity increases
Solution Approach 1:
The control unit serves multiple functions: it manages focus operations, zoom operations, and the calculation of compensatory movements. By integrating these multiple functions into a single control unit that can handle various operation types through a unified control algorithm, the system achieves high productivity without proportionally increasing device complexity
Data Source
AI summary
A lens apparatus, includes: a plurality of lens units movable in an optical axis direction; a plurality of driving units configured to move the plurality of lens units; an acquisition unit that acquires one or more first optical performances selected from a plurality of optical performances by a user; and a control unit configured to control the plurality of driving units, in which the control unit sets a plurality of loci of the plurality of lens units, along which the plurality of lens units are to be moved when driven by the plurality of driving units, based on one or more target values for each of the one or more first optical performances.