Endoscope Light Source Apparatus Color Balance Control
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Solution Overview
Problem
In endoscopic observation, secondary light generated due to reflection can alter the color tone of the desired living organism tissue, leading to inaccurate diagnosis, especially when observing at different distances, as the amount of secondary light varies with the observation distance.
Innovation Solution
A light source apparatus with multiple LEDs (blue, green, red, and amber) controlled by a light source control unit to maintain or adjust color balance based on the observation distance, using specific emission amount controls to minimize the impact of secondary light, ensuring consistent color tone across different views.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the light-emission amount of the green light source is increased to improve illumination intensity, then the color balance of the illumination light changes, but this causes secondary light reflection to alter the color tone of the observed tissue
Solution Approach 1:
The system dynamically changes the emission parameters of multiple light sources (blue, green, red, amber LEDs) based on observation distance. When secondary light reflection is detected or anticipated, the control unit adjusts the intensity ratios of different wavelength light sources to compensate for color tone shifts caused by reflected light, thereby maintaining accurate color representation of the tissue.
Solution Approach 2:
The system uses feedback from the observed light tone to control the light-emission amounts. The control unit monitors the color balance of returned light and adjusts the emission amounts of individual light sources accordingly. This closed-loop control ensures that even when secondary light is present, the overall color balance remains accurate for diagnostic purposes.
2Area of stationary object
If the observation distance is increased to obtain a broader view, then the amount of secondary light increases, but this causes the color tone of the tissue to change
Solution Approach 1:
The system adapts light emission parameters based on observation distance. At greater distances where secondary light reflection is more prominent, the control unit modifies the intensity distribution across different wavelength light sources. Specifically, it adjusts the ratios of blue, green, red, and amber light emission to counteract the color shifts introduced by increased secondary light, maintaining consistent color tone representation across different observation areas.
3Manufacturing precision
If the light-emission amount of individual light sources is adjusted to maintain color balance, then the color accuracy is improved, but this requires complex control mechanisms
Solution Approach 1:
The illumination system is segmented into multiple independent light sources with different spectral characteristics (blue LED, green LED, red LED, amber LED). Each light source can be controlled independently, allowing the system to fine-tune the spectral composition of the illumination light. This segmentation enables precise control over color balance by adjusting individual light source intensities based on the specific observational conditions and secondary light effects.
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 effectively suppresses changes in the color tone of the observed tissue, ensuring high accuracy in diagnosis by adjusting the light emission amounts of LEDs to counteract the effects of secondary light, maintaining accurate color representation regardless of the observation distance.
Implementation Method 1
a first light source configured to generate blue light included in illumination light for irradiating living organism tissue in a subject, a second light source configured to generate green light included in the illumination light, a third light source configured to generate red light included in the illumination light
Data Source
AI summary
In a light source apparatus for endoscope, when a light-emission amount of a second light source is less than or equal to a predetermined light-emission amount, a light source control circuit performs a first light-emission amount control of changing the light-emission amounts of the first to third light sources so as to allow a color balance to be maintained at a predetermined color balance. When the light-emission amount of the second light source is greater than the predetermined light-emission amount, the light source control circuit performs a second light-emission amount control of changing the light-emission amount of the third light source by a method different from the first light-emission amount control while changing the light-emission amounts of the first and second light sources by the same method as the first light-emission amount control so as to allow the color balance to be different from the predetermined color balance.