Multi-Lens Position Control for Disturbance-Resistant Zoom Tracking
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Solution Overview
Problem
Existing lens control methods fail to effectively account for disturbances such as jitter and velocity variations due to individual lens differences and environmental changes, leading to deteriorated zoom tracking performance and noise generation.
Innovation Solution
A control device that includes a first target position generation unit to set a target position for a first driving member based on its target speed, a first control unit to control the first driving member's position, a second target position generation unit to set a target position for a second driving member based on the first driving member's actual or target position, and a second control unit to control the second driving member's position, thereby reducing velocity disturbances and improving zoom tracking accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If lens position and speed are controlled based on focal length information, then zoom tracking can be achieved, but velocity disturbance due to jitter and individual lens differences cannot be compensated, deteriorating zoom tracking performance
Solution Approach 1:
The patent implements feedback control by measuring the actual position of each lens and comparing it with the target position. The position deviation is fed back to the control unit, which adjusts the drive signals to compensate for disturbances. This closed-loop feedback mechanism enables real-time correction of velocity disturbances caused by jitter and individual lens differences, thereby improving zoom tracking accuracy while maintaining reliability.
2Extent of automation
If multiple lenses are controlled to move based on reference lens movement locus, then multi-group zoom control is achieved, but disturbances from reference lens and other lenses are superimposed, generating noise and deteriorating performance
Solution Approach 1:
The patent divides the control of each lens into independent control units, where each lens has its own position detection and control unit. This segmentation allows individual compensation for disturbances affecting each lens, preventing the superposition of disturbances from the reference lens and other lenses. By controlling lenses independently rather than as a coupled system, noise and disturbance are reduced while maintaining automated multi-group zoom control.
Data Source
AI summary
A control device includes: a first target position generation unit configured to generate a first target position serving as a movement target of the first driving member on the basis of a target speed of a first driving member; a first control unit configured to control a position of the first driving member so that the first driving member follows the first target position; a second target position generation unit configured to generate a second target position serving as a movement target of a second driving member in accordance with an actual position of the first driving member or the first target position; and a second control unit configured to control a position of the second driving member so that the second driving member follows the second target position.