Zoom Lens Speed Control for Focus Tracking
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Solution Overview
Problem
Existing zoom tracking methods, particularly auto zoom tracking, face challenges in maintaining fast zooming speeds while ensuring consistent focus, as they require adjusting the zooming speed based on the position of the zoom lens to prevent defocusing, which is technically difficult and time-consuming, especially when moving towards higher zoom powers.
Innovation Solution
An apparatus and method that determine optimal zooming speeds for each position of a zoom lens using locus data, including data for infinite and minimum distance objects, to adjust the zooming speed dynamically, ensuring the focus lens moves in sync with the zoom lens within a unit time, thereby maintaining focus without prolonged adjustment times.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If zooming speed is rapidly reduced when zoom lens moves toward higher zoom power, then zoom tracking performance is maintained, but demand for fast zooming speed cannot be satisfied
Solution Approach 1:
The patent applies dynamics by making the zooming speed variable rather than constant. The control unit dynamically adjusts the zooming speed based on the current zoom position, using pre-stored position information and focus lens movement ranges to calculate optimal speeds at different zoom levels, thereby maintaining focus accuracy while improving overall zooming performance
Solution Approach 2:
The patent implements preliminary action by pre-storing the range of focus lens movement at each zoom position before actual zooming occurs. This allows the control unit to calculate and prepare optimal zooming speeds in advance based on known focus lens capabilities, ensuring both speed optimization and focus maintenance without real-time trial and error
2Ease of manufacture
If zooming speed is calculated using test values during development stage, then zoom tracking can be implemented, but long period of time is taken and consistent performance cannot be maintained
Solution Approach 1:
The patent applies copying by using pre-measured and stored focus lens movement range data for each zoom position, which represents the optimal performance characteristics. Instead of repeated physical testing during development, the system copies these predetermined values into storage and uses them for real-time zoom control, significantly reducing development time while maintaining consistent performance
Solution Approach 2:
The patent implements parameter changes by storing and utilizing multiple sets of zooming speed parameters corresponding to different zoom positions. The control unit selects and applies the appropriate parameter set based on the current zoom state, enabling consistent performance across various zoom levels without requiring repeated development testing
Data Source
AI summary
An optimal zooming speed determining device includes: a storage to store a zooming speed at each position of a zoom lens; a tracking implementer to calculate a position of the zoom lens changed in a unit time at a zooming speed at each position of the zoom lens; a moving time calculator to calculate a difference between a position of a focus lens corresponding to a position of the zoom lens before the position of the zoom lens is changed and a position of the focus lens corresponding to the changed position of the zoom lens, and calculate a focus moving time by dividing the difference between positions of the focus lens by a highest moving speed of the focus lens; and a zooming speed determiner to reduce the zooming speed at each position of the zoom lens, if the focus moving time is greater than the unit time.