Focus Controller Temperature Correction via Cooling Fan Speed
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Solution Overview
Problem
Conventional image capturing apparatuses face focus deviation due to temperature changes, particularly when equipped with cooling fans, as the temperature detected by sensors may differ from the actual lens temperature, leading to inadequate focus correction and increased complexity and cost.
Innovation Solution
A control apparatus and method that acquires correction data relating temperature differences to focus movement, using a focus controller to adjust focus based on these differences and the drive state of a temperature changer, such as a cooling fan, to perform accurate focus control, thereby simplifying the configuration and improving focus correction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a temperature sensor is used to detect temperature for focus correction, then focus correction can be performed based on temperature changes, but the detected temperature may differ from the actual lens temperature when the cooling fan rotation speed changes, leading to inaccurate focus correction
Solution Approach 1:
The patent introduces a cooling fan rotation speed detection mechanism as an intermediary element. By detecting the fan's rotation speed and using it to determine temperature correction values, the system indirectly compensates for the temperature measurement error caused by fan operation, rather than directly measuring the lens temperature or relying solely on the temperature sensor reading
Solution Approach 2:
The system implements feedback by detecting the cooling fan's rotation speed and using this information to adjust the temperature correction values. The focus correction amount is dynamically adjusted based on the fan state, creating a closed-loop control system that compensates for temperature measurement errors caused by active cooling
2Reliability
If a reference light source, pinhole, beam splitter, and other components are added to achieve accurate focus correction when lens temperature differs from sensor temperature, then satisfactory focus correction can be achieved, but the device configuration becomes complicated and cost increases
Solution Approach 1:
The patent extracts and utilizes the cooling fan's rotation speed information as a key parameter for focus correction. Instead of adding complex optical components, the system leverages existing operational data from the cooling fan to determine temperature correction values, simplifying the overall device configuration
Solution Approach 2:
The system uses information from the cooling fan's own operation (rotation speed) to correct the focus errors it causes. The cooling fan's operational state directly provides the data needed to compensate for its own thermal effects, eliminating the need for separate, complex measurement and correction systems
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 approach effectively corrects focus deviations caused by temperature changes with a simple configuration, preventing erroneous focus corrections and maintaining image clarity even when the cooling fan's rotation affects temperature detection.
Implementation Method 1
a temperature detector configured to detect a temperature
Implementation Method 2
a cooling fan for radiating heat
Data Source
AI summary
A control apparatus (13) includes a data acquirer (13a) that acquires correction data indicating a relationship between a temperature difference between a temperature detected by a temperature detector (12) and a reference temperature, and a focus movement amount, and a focus controller (13b) that performs focus correction based on the temperature difference and the correction data to perform focus control, and the focus controller (13b) changes the focus correction depending on a drive state of a temperature changer (17) that changes a temperature.