White Light LED Illumination System with Spectral Conversion
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Solution Overview
Problem
The use of solid-state lighting elements, such as white light LEDs, in microscopy and medical diagnostics poses challenges due to their differing spectral distribution compared to conventional halogen light sources, leading to inconsistent diagnostic standards and potential errors in pathological examinations.
Innovation Solution
An illumination optical system that combines a white light LED with a wavelength distribution conversion element, such as filters, to adjust the spectral transmittance and resemble the spectral components of daylight, allowing for consistent diagnostic standards with conventional halogen light sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a white light LED is used as the illumination light source, then energy consumption is reduced and lifespan is extended, but the spectral distribution becomes non-uniform and differs from conventional halogen light sources
Solution Approach 1:
A wavelength distribution conversion element is introduced as an intermediary component between the white light LED and the observation target. This element converts the non-uniform spectral distribution of the LED into a uniform spectral distribution that resembles daylight, thereby resolving the contradiction between energy efficiency and spectral uniformity.
Solution Approach 2:
The spectral distribution parameters of the illumination light are changed by passing it through a wavelength distribution conversion element. This element modifies the wavelength composition to achieve a uniform spectral distribution across the visible range, transforming the LED's non-uniform output into a diagnostically acceptable illumination profile.
2Use of energy by stationary object
If a white light LED is used as the illumination light source, then power consumption is reduced, but diagnostic accuracy deteriorates due to different spectral components compared to halogen sources
Solution Approach 1:
The wavelength distribution conversion element serves as a mediator that transforms the LED's spectral output to match the diagnostic requirements. By converting the spectral composition to resemble daylight, it ensures that diagnostic accuracy is maintained while retaining the energy efficiency benefits of LED illumination.
Solution Approach 2:
The spectral parameters of the illumination light are modified to achieve uniformity across wavelengths. This parameter transformation ensures that the illumination provides consistent color rendering and spectral content, thereby maintaining diagnostic reliability while using energy-efficient LED technology.
3Stability of the object's composition
If a wavelength distribution conversion element is added to the illumination optical system, then spectral uniformity is improved, but device complexity increases
Solution Approach 1:
The wavelength distribution conversion function is extracted as a separate, dedicated component rather than being integrated into the LED itself. This modular approach allows for easier replacement and optimization of the conversion element without redesigning the entire illumination system, thereby managing complexity effectively.
Solution Approach 2:
The wavelength distribution conversion element is designed to work with various LED types and configurations, providing a universal solution for achieving uniform spectral distribution. This multi-functionality reduces the need for custom-designed systems for different applications, thereby simplifying overall system complexity.
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 the use of the same diagnostic standards for white light LEDs as for halogen light sources, reducing errors and burdens on diagnosticians by aligning the spectral output with daylight-like illumination, thus ensuring accurate color representation and consistent judgments.
Implementation Method 1
combining a white light LED light source with a wavelength distribution conversion element so as to thereby provide a distribution of spectral components that is similar to that output by a conventional halogen light source when combined with a light balanced daylight filter
Implementation Method 2
a fluorescent element that emits light having wavelengths centered about a longer peak wavelength. The fluorescent element is excited by the light emitted by the LED
Data Source
AI summary
An illumination optical system for use in a microscope or electronic endoscope includes a solid-state lighting element that generates light having a spectral profile with peak intensities at multiple wavelengths such that the light output by said solid-state lighting element is perceived by an observer as being white in color, and a wavelength distribution conversion element having a spectral transmittance profile that includes specified wavelength regions within which the transmittance is nearly constant with increasing wavelength so as to form a step of nearly even intensity, and having specified wavelength regions within which the transmittance changes with increasing wavelength so as to form a transition region. By the combined effect of the solid-state lighting element and the wavelength distribution conversion element, the wavelength distribution of the light generated by the illumination optical system more closely resembles the wavelength distribution of daylight than the light generated by the solid-state lighting element.