Lighting Device Spectrum Matching Method
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Conventional lighting devices using pseudo white LEDs fail to replicate the continuous spectrum of natural light sources like sunlight and moonlight, resulting in different psychological impressions despite being white light, and existing solutions like cherry blossom pink lighting only match chromaticity coordinates without replicating the original reflection spectrum.
Innovation Solution
A method for manufacturing lighting devices by spectroscopically measuring the reflection spectrum of a target object and adjusting the emission spectrum of a light source to approximate the measured spectrum, using LED elements and fluorescent substances to create a broad continuous wavelength composite spectrum that mimics the color of the object.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If pseudo white LED is used to achieve white light, then energy efficiency is improved, but color rendering property deteriorates due to discontinuous spectrum
Solution Approach 1:
The patent divides the continuous spectrum into multiple discrete wavelength bands, each corresponding to a specific fluorescent substance. By segmenting the spectrum into distinct regions (blue, cyan, green, yellow-green, yellow, orange, red) and assigning specific fluorescent materials to each region, the invention reconstructs a continuous-like spectrum using discrete components, thereby improving color rendering while maintaining LED energy efficiency.
Solution Approach 2:
The patent employs a composite approach by combining multiple fluorescent substances (YAG, Lu3Al5O12:Ce, β-SiAlON:Eu, CaAlSiN3:Eu, Sr2Si5N8:Eu, BaMgAl10O17:Eu) with a blue LED excitation source. This composite material system creates a pseudo-continuous spectrum that closely resembles natural sunlight, resolving the contradiction between energy efficiency and color rendering by integrating multiple materials with complementary emission characteristics.
2Ease of manufacture
If chromaticity coordinates are matched to reproduce object color, then ease of manufacture is improved, but spectral accuracy deteriorates
Solution Approach 1:
The patent replaces the conventional chromaticity coordinate matching approach (which is simple but spectrally inaccurate) with a spectroscopic measurement and simulation system. By using computational tools (Excel spreadsheets, spectral simulation software) to calculate and optimize the emission spectra of multiple fluorescent substances, the invention achieves both manufacturing feasibility and high spectral accuracy, effectively substituting simple colorimetric methods with more sophisticated spectral engineering.
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 method enables the creation of lighting devices that emit light approximating the color of objects, such as the moon, sky, and flowers, providing more familiar and effective psychological impressions by closely matching the original reflection spectrum, rather than just chromaticity coordinates.
Implementation Method 1
a blue light-emitting LED, and a first yellow fluorescent substance and a second yellow fluorescent substance and a green fluorescent substance and a red fluorescent substance, which are different kinds of fluorescent substances, are disposed in a housing
Implementation Method 2
a first yellow fluorescent substance and a second yellow fluorescent substance and a green fluorescent substance and a red fluorescent substance, which are different kinds of fluorescent substances, are disposed in a housing
Data Source
AI summary
Provided is a lighting device that emits light of a color that approximates the color of the surface of an object or the like. Disclosed is a method for manufacturing a lighting device, including the steps of: spectroscopically measuring a spectrum that constitutes a color of a measurement target; and adjusting a color of a light source such that an emission spectrum approximates the spectrum that constitutes the color of the measurement target.