Endoscope Light Source Matching Xenon Spectrum
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Solution Overview
Problem
Endoscope systems using semiconductor light sources struggle to reproduce the broadband continuous-spectrum light of xenon lamps, making it difficult to compare images captured under multicolor spectrum light with those captured under continuous-spectrum light, as the light quantity distribution across different wavelengths is challenging to match.
Innovation Solution
A light source device with multiple independently controlled LEDs that combine violet, blue, green, and red light to create a multicolor spectrum, with a controller ensuring the light quantity integral in specific wavelength bands matches that of continuous-spectrum light, using a verifier to adjust and maintain the light quantities for accurate reproduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple semiconductor light sources emitting different colors are used to create multicolor spectrum light, then the light source can be controlled independently to adjust the spectrum, but the light quantity distribution across different wavelengths is difficult to match with continuous-spectrum light
Solution Approach 1:
The patent divides the spectrum into multiple wavelength bands (first wavelength band and second wavelength band) and independently controls the light quantity of semiconductor light sources in each band. This segmentation allows precise adjustment of light quantity distribution across different wavelengths, enabling matching with continuous-spectrum light characteristics while maintaining the versatility of independent control of multiple light sources.
2Measurement precision
If the light quantity of semiconductor light sources is adjusted to match continuous-spectrum light, then image comparability is improved, but the control complexity increases
Solution Approach 1:
The patent changes the control parameters of semiconductor light sources by adjusting their light quantities in specific wavelength bands. The controller modifies the light quantity of light sources in the first wavelength band and the second wavelength band to match the spectral characteristics of continuous-spectrum light, thereby achieving image comparability through parameter adjustment rather than complex system redesign.
3Duration of action of stationary object
If multicolor spectrum light is used instead of continuous-spectrum light, then the light source has longer lifespan and can be controlled independently, but the images captured look different and are difficult to compare
Solution Approach 1:
The patent applies local quality by adjusting the light quantity distribution of multicolor spectrum light in specific wavelength bands to match the spectral characteristics of continuous-spectrum light. By controlling the light quantity of semiconductor light sources locally in the first and second wavelength bands, the patent maintains the long lifespan and independent control advantages of semiconductor light sources while achieving image comparability through localized spectral matching.
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
Enables observation of objects under multicolor spectrum light in a manner comparable to continuous-spectrum light, allowing for effective comparison of images and maintaining image quality by stabilizing light distribution across wavelength bands.
Implementation Method 1
a light source unit having four light emitting diodes (LEDs) of different colors: a violet LED (20a), a blue LED (20b), a green LED (20c), and a red LED (20d)
Implementation Method 2
semiconductor light sources (e.g. an LED (light emitting diode) or the like) has been replacing the broadband light source
Data Source
AI summary
A light source device for an endoscope comprises a light source unit and a light source controller. The light source unit has LEDs independently emitting light of respective different colors, and emits first multicolor spectrum light having a first multicolor spectrum, into which the light from the LEDs is combined. The light source controller makes a light quantity integral of the first multicolor spectrum light in a first wavelength band equal to a light quantity integral of continuous-spectrum light in the first wavelength band and makes a light quantity integral of the first multicolor spectrum light in a second wavelength band equal to a light quantity integral of the continuous-spectrum light in the second wavelength band. The continuous-spectrum light includes at least a part of a wavelength band of light emitted from a white light source. The second wavelength band is different from the first wavelength band.