Endoscope Light Source Diaphragm Control Circuit
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Solution Overview
Problem
Existing light source devices for endoscopes face challenges in maintaining stable luminance due to errors between control voltage widths and opening/closing positions of diaphragm blades, which are prone to individual differences and changes over time, requiring manual adjustments that are time-consuming and prone to errors, and are affected by external factors like vibration during transportation.
Innovation Solution
A light source device with a diaphragm member that includes a diaphragm driving part, an opening/closing control part, and a control range setting part, which detects fixed position information to adjust the drive signal and regulate the control range, allowing for automatic adjustment of diaphragm blade positions and reducing maintenance costs by eliminating the need for manual trimmer adjustments.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If manual trimmer adjustment is used to correct errors between control voltage widths and diaphragm blade positions, then adjustment accuracy can be improved, but production time increases and working efficiency deteriorates
Solution Approach 1:
The patent replaces the manual mechanical trimmer adjustment process with an automatic electronic adjustment system. The control unit automatically detects the actual diaphragm blade positions and adjusts the control voltage widths to match, eliminating the need for manual mechanical trimming while maintaining high adjustment accuracy.
Solution Approach 2:
The system performs self-adjustment by automatically detecting position errors between control voltage widths and actual diaphragm blade positions, then autonomously correcting these errors without requiring external manual intervention. This self-service capability improves both efficiency and consistency.
2Manufacturing precision
If manual trimmer adjustment is performed, then individual errors can be corrected, but adjustment results vary depending on worker differences and physical conditions
Solution Approach 1:
The patent replaces manual mechanical adjustment with an automated electronic control system that objectively detects and corrects position errors. This eliminates human variability and physical condition dependencies, ensuring consistent adjustment results across different operators and time periods.
Solution Approach 2:
The system implements feedback control by detecting the actual diaphragm blade positions, comparing them with the intended control voltage widths, and automatically adjusting to eliminate discrepancies. This closed-loop feedback mechanism ensures reliable and repeatable adjustment results.
3Manufacturing precision
If trimmer adjustment is performed manually, then initial errors can be corrected, but errors tend to return after assembly or transportation vibration
Solution Approach 1:
The patent performs preliminary automatic adjustment detection and correction before final assembly or transportation. The control unit detects position errors and adjusts control voltage widths in advance, preventing error return due to subsequent vibrations or handling.
Solution Approach 2:
The system uses feedback control to detect and correct position discrepancies between control voltage widths and actual diaphragm blade positions. This continuous monitoring and adjustment capability maintains stable alignment even after assembly or transportation events.
4Reliability
If diaphragm units are replaced due to malfunction, then functionality can be restored, but new adjustment of control voltage widths and opening/closing positions is required
Solution Approach 1:
The system performs self-adjustment automatically after diaphragm unit replacement. The control unit detects the new diaphragm blade positions and autonomously adjusts the control voltage widths, eliminating the need for manual re-adjustment and simplifying the replacement process.
Solution Approach 2:
The patent replaces manual re-adjustment procedures with automated electronic detection and adjustment. After diaphragm unit replacement, the system automatically detects position errors and corrects control voltage widths, making replacement simpler and faster.
5Ease of manufacture
If control voltage widths are set in advance based on control voltage widths, then initial setup is simplified, but errors occur at opening/closing positions due to assembly balance errors and friction
Solution Approach 1:
The system uses feedback control to detect the actual diaphragm blade positions and compare them with the intended control voltage widths. This feedback mechanism identifies position errors caused by assembly balance errors or friction and enables automatic correction, maintaining both simplicity and precision.
Solution Approach 2:
The patent replaces manual mechanical trimming with automated electronic adjustment. The control unit detects position discrepancies and automatically adjusts control voltage widths, eliminating the need for manual trimmer work while achieving high position accuracy.
Data Source
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AI summary
A light source device includes a light source 8, a diaphragm blade 21 for adjusting light quantity of illumination light supplied from the light source 8, a diaphragm driving part 25 for driving the diaphragm blade 21 to perform opening/closing operation, and a diaphragm control circuit part 23 for setting diaphragm drive instruction voltage to be supplied to the diaphragm driving part 25 and control an opening/closing amount of the diaphragm blade 21. In the diaphragm control circuit part 23, a fully-opened voltage and a fully-closed voltage at the time the diaphragm blade 21 is fixed at a fully-opened position and a fully-closed position are read, based on the voltages, adjustment data for adjusting the diaphragm drive instruction voltage and the opening/closing positions of the diaphragm blade 21 is set, and based on the adjustment data, a control range of the diaphragm drive instruction voltage is regulated.