Focus Controller Correction Data for Temperature Deviation
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Solution Overview
Problem
Existing image capturing apparatuses with cooling fans face challenges in accurately correcting focus position deviations due to temperature changes, as the detected temperature may differ from the actual temperature of the optical system, leading to inadequate focus position correction.
Innovation Solution
A control apparatus and method that acquires correction data on temperature changes and focus movements, allowing the focus controller to adjust the operation mode of the temperature changer, such as the cooling fan, to accurately correct focus position deviations by correlating detected temperatures with actual optical system temperatures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Temperature
If a cooling fan is added to radiate heat from the image capturing apparatus, then the temperature control capability is improved, but the temperature detection accuracy deteriorates because the detected temperature deviates from the actual optical system temperature
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing correction data that indicates the relationship between temperature changes and focus movement amounts before actual operation. When the cooling fan operates, the system retrieves and applies the appropriate correction data based on the fan's operation state, thereby compensating for the temperature detection deviation in advance rather than attempting to detect the actual temperature directly.
Solution Approach 2:
The patent introduces an intermediary element - the correction data - that mediates between the cooling fan's operation and the focus position correction. Instead of directly using the inaccurate temperature detection, the system uses the correction data as an intermediate reference to calculate the appropriate focus adjustment, thereby resolving the contradiction between temperature control and detection accuracy.
2Manufacturing precision
If focus position correction is performed based on detected temperature when cooling fan is rotating, then focus correction is attempted, but the focus position deviates instead because the detected temperature differs from actual optical system temperature
Solution Approach 1:
The system performs preliminary measurement and storage of correction data that captures the relationship between temperature changes and focus movement amounts under various cooling fan operation conditions. This pre-established correction data enables accurate focus correction without relying on real-time temperature detection accuracy during fan operation.
Solution Approach 2:
The patent implements a feedback mechanism where the cooling fan's operation state is monitored and used to select appropriate correction data. The system continuously monitors whether the fan is rotating or stopped, and dynamically applies the corresponding correction data to maintain accurate focus position correction despite temperature detection deviations caused by fan operation.
3Device complexity
If simple focus correction based on detected temperature is applied, then the control process is simple, but the focus position correction is insufficient when cooling fan is operating
Solution Approach 1:
The patent applies preliminary action by pre-measuring and storing correction data under different cooling fan operation conditions. This approach maintains simple real-time control logic while embedding the complexity of multiple operating conditions into the pre-computed correction data, thereby achieving accurate focus correction without complicating the runtime control process.
Solution Approach 2:
The system dynamically adapts to different operating conditions by selecting appropriate correction data based on the cooling fan's state. Rather than using a fixed correction method, the system dynamically switches between different correction data sets corresponding to fan-on and fan-off conditions, thereby maintaining high correction accuracy across varying operational scenarios.
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
This solution effectively corrects focus position deviations caused by temperature changes, even in apparatuses with cooling fans, by dynamically adjusting the cooling fan's operation mode based on pre-measured correction coefficients, ensuring precise focus control.
Implementation Method 1
an image capturing apparatus provided with a cooling fan for radiating the heat generated by the process of the image capturing apparatus
Implementation Method 2
an image sensor configured to photoelectrically convert an optical image formed via an image capturing optical system
Data Source
AI summary
A control apparatus (13) includes a data acquirer (13a) that acquires correction data indicating a relationship between a temperature change amount and a focus movement amount and a focus controller (13b) that changes an operation mode of a temperature changer depending on the correction data.