Lighting Device With Wavelength-Selective Plate For Natural Light Simulation
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Solution Overview
Problem
Conventional lighting devices fail to replicate a natural lighting environment, particularly in settings with streaming light through windows, as they do not accurately mimic the shadows and color variations of natural light.
Innovation Solution
A lighting device incorporating a light-transmissive plate that absorbs or scatters light in specific wavelength ranges, combined with an image projecting device emitting light in different wavelength ranges, to recreate the ambiance of natural light, including shadows and color temperature variations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If conventional lighting devices use uniform light transmission through a light-transmissive plate, then the device structure is simple, but the lighting environment cannot reproduce natural light characteristics including shadows and color variations
Solution Approach 1:
The light-transmissive plate is designed with spatially varying optical properties, where different regions have different absorption and scattering characteristics. Specifically, the plate contains wavelength-selective regions that absorb or scatter light in the first wavelength range (380-550nm) more than light in the second wavelength range, creating localized optical effects that reproduce natural light characteristics such as shadows and color temperature variations without requiring complex overall system design
Solution Approach 2:
The patent utilizes wavelength-dependent optical parameters of the light-transmissive plate to achieve natural light reproduction. By controlling the absorption and scattering properties across different wavelength ranges, the system transforms uniform light input into non-uniform light output that mimics natural sunlight characteristics, including the bluish sky light and direct sunlight effects
2Manufacturing precision
If the light-transmissive plate absorbs or scatters light in the first wavelength range more than the second wavelength range, then natural light reproduction is improved, but the device complexity increases
Solution Approach 1:
The patent combines multiple optical functions (absorption, scattering, wavelength selection) into a single light-transmissive plate component. This integration eliminates the need for separate optical elements and complex optical paths, achieving natural light reproduction through a unified structure that maintains simplicity while delivering sophisticated optical effects
Solution Approach 2:
The light-transmissive plate is designed to copy the spectral and spatial characteristics of natural sunlight by selectively absorbing or scattering light in specific wavelength ranges. This allows the system to reproduce natural light effects without requiring actual natural light sources or complex optical systems that mimic nature's complexity
3Manufacturing precision
If the lighting device uses wavelength-selective absorption and scattering to reproduce natural light, then lighting quality is improved, but the loss of light energy increases
Solution Approach 1:
The patent converts the potential harm of light energy loss through absorption into a beneficial effect by using selective wavelength absorption to create natural light reproduction. The absorbed light in the first wavelength range (380-550nm) is not wasted but used to create the desired optical effect of reproducing natural sunlight characteristics, transforming energy loss into functional benefit
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 effectively reproduces a lighting environment resembling natural conditions, reducing the need for complex optical systems and allowing for a more realistic simulation of natural light, including blue skies and direct sunlight, while simplifying the device's configuration and reducing size and weight.
Implementation Method 1
The light-transmissive plate absorbs or scatters the light in the first wavelength range more than the light in the second wavelength range
Implementation Method 2
The light-transmissive plate absorbs or scatters the light in the first wavelength range more than the light in the second wavelength range
Data Source
AI summary
A lighting device is provided. The lighting device includes: a light-transmissive plate having an entrance surface; and an image projecting device that irradiates the entrance surface of the light-transmissive plate with image light. The image light passing through the light-transmissive plate is projected on an object. The image light emitted by the image projecting device includes light in a first wavelength range and light in a second wavelength range. Here, the light in the second wavelength range is longer in wavelength than the light in the first wavelength range. The light-transmissive plate absorbs or scatters the light in the first wavelength range more than the light in the second wavelength range.