Endoscope Light Source Color Balance Control
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Solution Overview
Problem
Conventional endoscope light source apparatuses using LEDs face challenges in achieving accurate color balance and photometric accuracy due to varying light emission characteristics and temperature dependencies of LEDs, making it difficult to maintain consistent light amounts detected by optical sensors.
Innovation Solution
A light source apparatus with a first and second light source, each with a detection section to monitor light amounts, and a control section that adjusts light emission based on detection results, using light amount limiting members to ensure equal light amounts are detected by optical sensors, thereby maintaining color balance and improving photometric accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple color LEDs are used to achieve desired color balance, then color balance can be adjusted, but the light amounts detected by optical sensors become inconsistent due to varying LED characteristics and maximum light emission differences
Solution Approach 1:
The patent applies local quality by providing separate light amount limiting members (optical filters) for each color LED, allowing individual adjustment of light amounts incident to each optical sensor. This enables compensation for varying LED characteristics while maintaining overall color balance, resolving the contradiction between color balance adaptability and detection consistency.
Solution Approach 2:
The patent changes the parameter of light amount by introducing controllable light amount limiting members that can adjust the intensity of light from each LED. This parameter adjustment allows the system to compensate for differences in LED maximum light emission and maintain consistent detection levels across all color sensors.
2Measurement precision
If light amount limiting members are introduced to equalize light amounts, then detection consistency improves, but device complexity increases
Solution Approach 1:
The patent segments the optical path by introducing separate light amount limiting members for each color LED channel. This segmentation allows independent control of light amounts for each sensor, improving detection consistency while keeping the added complexity localized to individual channels rather than the entire system.
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 solution ensures that each optical sensor receives light at an appropriate level, allowing for accurate detection and control of light amounts, enhancing the color balance and photometric accuracy of the endoscope's illumination, regardless of LED emission ratios and sensor sensitivity.
Implementation Method 1
a light amount limiting section that limits a light amount of light incident upon the second light amount detection section so that the light amounts detected in the first light amount detection section and the second light amount detection section match a predetermined value within the detection range
Data Source
AI summary
A light source apparatus includes first and second light sources having different maximum light amounts used, a first light amount detection section detecting a light amount of first light of the first light source, a second light amount detection section detecting a light amount of second light of the second light source, a light amount limiting section limiting a light amount of light incident upon the second light amount detection section so that light amounts detected in the first light amount detection section and the second light amount detection section match a predetermined value within a detection range when light with the maximum light amounts used are emitted from the first light source and the second light source, and a control section controlling amounts of light emission of the first light source and the second light source based on detection results of the first and second light amount detection sections.