Light Source Device Using Optical Filter for Halogen Spectral Match
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Solution Overview
Problem
The spectral characteristics of white LEDs differ significantly from those of halogen lamps, causing chromatic aberration issues when used as light sources in devices that require precise measurements, such as lens performance evaluation.
Innovation Solution
A light source device comprising a white LED with an emission peak in the blue range and an optical filter that partially reduces blue light emission, matching the spectral characteristics of halogen lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a white LED is used as a light source to reduce costs and power consumption, then energy efficiency is improved, but spectral characteristics differ from halogen lamps causing chromatic aberration
Solution Approach 1:
An optical filter is introduced as an intermediary component between the white LED and the optical system. This filter selectively transmits blue light while blocking other wavelengths, transforming the LED's broad spectrum output into a blue-range-dominant spectrum that mimics halogen lamp characteristics for measurement purposes
Solution Approach 2:
The spectral parameters of the light source are changed by using an optical filter with specific transmission characteristics. The filter is designed to transmit light in the 435-465nm range with high transmittance while blocking other wavelengths, thereby adjusting the output spectrum to match required measurement conditions
2Use of energy by moving object
If a white LED with blue emission peak is used, then power consumption is reduced, but blue light aberration increases due to excessive blue light content
Solution Approach 1:
An optical filter serves as a mediator to control the blue light content. The filter transmits blue light in the 435-465nm range while blocking excessive blue light and other wavelengths, achieving a balance between energy efficiency and optical performance
Solution Approach 2:
The optical filter applies selective quality control to different wavelength ranges. It provides high transmittance (≥50%) for blue light in the 435-465nm range while blocking other wavelengths, creating a localized spectral quality that matches measurement requirements without excessive blue light content
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 reduces power consumption and costs while achieving spectral characteristics similar to halogen lamps, minimizing aberrations in optical performance.
Implementation Method 1
an optical filter that partially reduces the quantity of light in the blue range in the white light emitted from the white LED
Implementation Method 2
a white LED that emits white light having an emission peak in a blue range
Data Source
AI summary
Disclosed is a light source device that has lower costs and lower power consumption compared to a halogen lamp, and has the same spectral characteristics as the halogen lamp. The light source device includes a white LED that emits White light having an emission peak in a blue range and an optical filter that partially reduces the quantity of light in the blue range in the white light emitted from the white LED such that the spectral characteristics of the white light emitted from the white LED are close to those of light emitted from a halogen lamp.