Lens Control Apparatus Temperature Correction
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Solution Overview
Problem
Existing lens control systems fail to accurately correct defocusing caused by temperature changes due to the lack of consideration for the varying expansion and contraction of materials and their impact on focus lens position, leading to incomplete correction of positional deviations.
Innovation Solution
A lens control apparatus with a temperature detection unit, calculation units for determining temperature change and correction coefficients, and a lens control unit that adjusts lens driving based on these calculations to achieve precise focus position correction, taking into account the tendency of temperature change and material-specific coefficients.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If temperature correction is performed using only current temperature and zoom ratio, then correction calculation is simple, but defocusing caused by temperature change history cannot be corrected
Solution Approach 1:
The system performs preliminary actions by detecting and storing temperature change history before correction is needed. The temperature detection unit continuously monitors temperature variations, and the storage unit preserves this historical data, enabling the correction unit to apply appropriate corrections based on both current state and thermal history, thereby improving focus accuracy without excessive complexity
Solution Approach 2:
The system implements feedback by using detected temperature changes to dynamically adjust focus lens position. The temperature detection unit provides continuous feedback on thermal conditions, the storage unit retains this feedback information, and the correction unit uses it to continuously refine focus positioning, creating a closed-loop system that improves reliability while maintaining manageable complexity
2Device complexity
If correction is applied without considering temperature change tendency, then correction process is simple, but defocusing due to expansion/contraction direction cannot be corrected
Solution Approach 1:
The system applies dynamics by transitioning from static correction (based only on current temperature) to dynamic correction (based on temperature change tendency). The correction unit determines whether temperature is rising or falling and applies directionally-appropriate corrections, allowing the system to adapt to thermal expansion/contraction patterns and achieve higher focus position precision with moderate increases in correction process complexity
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system effectively corrects defocusing to a focusing state closer to the original state by considering the tendency of temperature change and material-specific expansion/contraction, improving the accuracy of focus position adjustment.
Implementation Method 1
expansion and contraction of certain materials vary depending on whether a temperature has reached certain degrees after a rise or a fall
Data Source
AI summary
In an imaging apparatus, a control unit controls driving of a lens based on a correction amount calculated from a temperature change acquired by a temperature detection unit and a correction coefficient of the lens.