Micro Lens Array Lighting Device for Glare Reduction
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Solution Overview
Problem
Conventional indoor flat lighting devices fail to meet the Unified Glare Rating (UGR) standard of less than 19 due to their inability to effectively reduce light flux emitted at angles between 65 degrees to 90 degrees, leading to eye discomfort and fatigue.
Innovation Solution
A lighting device incorporating a diffusion unit and a condensing unit with a micro lens array, where the micro lenses have a sag determined based on the light emitting area and total light flux, and an adjustable spaced part between the units to minimize light flux at high angles, thereby reducing UGR.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a diffusion plate is used to diffuse light, then hot spot is reduced and light is emitted uniformly, but light at angles between 65-90 degrees still causes eye discomfort and fatigue
Solution Approach 1:
The patent divides the light control function into two separate components: a diffusion plate for uniform light distribution and a micro lens array for angle control. This segmentation allows each component to optimize its specific function without compromising the other, resolving the contradiction between uniform light emission and glare reduction at high angles
Solution Approach 2:
The micro lens array acts as an intermediary element between the diffusion plate and the final light output. It receives the uniformly diffused light and selectively redirects it to eliminate high-angle glare while preserving low-angle illumination, thus mediating between uniform emission and glare reduction requirements
2Object-affected harmful factors
If a reflecting shade or louver is used to reduce light spreading angle, then UGR is reduced, but aesthetic flat lighting is compromised
Solution Approach 1:
The patent replaces mechanical light control structures (reflecting shades, louvers) with an optical system using a micro lens array. This substitution achieves UGR reduction through optical refraction rather than mechanical blocking, preserving the flat lighting appearance while eliminating glare
Solution Approach 2:
The micro lens array changes the angular distribution parameters of the light by refracting it through controlled lens geometries. This parameter transformation achieves glare reduction without the mechanical structures that compromise aesthetic flat lighting, resolving the contradiction between UGR reduction and visual appearance
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 reduces light flux at angles between 65 degrees to 90 degrees, meeting the UGR standard while maintaining high light efficiency and minimizing side leakage and reflections.
Implementation Method 1
a diffusion unit for diffusing and emitting light incident from a light source
Implementation Method 2
a condensing unit located on a light emitting surface of the diffusion part, and including a micro lens array of lenses having sag determined depending on one of a light emitting area of the lighting device and the total light flux of the lighting device
Data Source
AI summary
Disclosed is a light device comprising: a diffusion unit for diffusing and radiating light incident from a light source; and a condensing unit installed on a light radiating surface of the diffusion unit, including a micro lens array of lenses having sag determined depending on one of a light emitting area of the lighting device and total light flux of the lighting device. Thus, the lighting device can reduce a light flux emitted at the angle between 65 deg and 90 deg, thereby meeting UGR conditions.