Light Source Device Color Balance Control
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Solution Overview
Problem
Conventional light source devices for endoscopic observation struggle to maintain accurate color balance among red, green, and blue lights, leading to inconsistencies in light amount ratios, which can result in unintended white light emission with different light amount ratios than intended.
Innovation Solution
The device incorporates a processor that adjusts the light emission of red, green, and blue LEDs by using sensor characteristic information and correction variables to ensure accurate light mixing and emission, allowing for simultaneous adjustment of light amounts to achieve the desired color balance, even when optical spectra overlap.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple LEDs with overlapping optical spectra are used to generate white light, then the versatility and color rendering capability are improved, but the manufacturing precision and color balance consistency deteriorate due to difficulty in controlling light amount ratios
Solution Approach 1:
The patent implements feedback control by measuring the actual light output from each LED and adjusting the drive currents to achieve the desired light amount ratios. The system continuously monitors and corrects deviations in color balance, ensuring consistent white light output despite variations in LED characteristics and overlapping spectra.
Solution Approach 2:
The patent changes the operating parameters (drive currents) of each LED to optimize the light amount ratios. By dynamically adjusting the current supplied to each LED based on its spectral characteristics and overlap with other LEDs, the system achieves precise color balance control while maintaining versatility in white light generation.
2Device complexity
If conventional light amount ratio adjustment methods are used, then the device complexity is reduced, but the measurement precision and color balance accuracy deteriorate
Solution Approach 1:
The patent replaces mechanical adjustment mechanisms with electronic control and computational methods. Instead of using physical filters or mechanical attenuators, the system uses processor-controlled current adjustment combined with spectral measurement and calculation to achieve precise light amount ratio control, thereby maintaining simplicity while improving accuracy.
3Illumination intensity
If LEDs with overlapping optical spectra are used, then the illumination quality is improved, but the light amount ratio control becomes more difficult leading to unintended white light emission
Solution Approach 1:
The patent introduces an intermediary processing layer that includes spectral measurement and computational adjustment. This intermediary system mediates between the overlapping LED spectra and the desired white light output by calculating and applying the appropriate drive currents, thereby simplifying control while maintaining high illumination quality.
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 solution enables precise adjustment of light amounts to maintain the intended color balance among red, green, and blue lights, ensuring consistent and accurate white light emission for endoscopic observation, thereby improving the color balance and reducing issues related to overlapping optical spectra.
Implementation Method 1
a first light emitting element configured to generate first light having intensity in a first wavelength band
Implementation Method 2
a second light emitting element configured to generate second light having intensity in a second wavelength band
Data Source
AI summary
A light source device includes: a first light emitting element configured to generate first light having intensity in a first wavelength band and having a first optical spectrum; a second light emitting element configured to generate second light having intensity in a second wavelength band adjoining to the first wavelength band and having a second optical spectrum overlapping with a part of the first optical spectrum; and a processor configured to, at a time of causing the first light emitting element and the second light emitting element to simultaneously perform light emission, cause the first light to be generated with a light amount adjusted according to a first mixed light amount which is a light amount of the second light mixed in the first wavelength band.