Lens Array Proportional to Light Source Intensity for Uniform Illumination
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Solution Overview
Problem
Conventional lighting devices, such as fluorescent lamps, cause eye fatigue due to flickering and non-uniform luminance, while LED lamps face issues with luminance and color uniformity when light sources emit different quantities of light, leading to potential yield reduction.
Innovation Solution
A lighting device design featuring a housing with a light-emitting module and a lens array unit where the size and separation of lenses are proportional to the light sources, adjusting to maintain uniform luminance and color, and an optical sheet for diffusing light, ensuring consistent illumination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If light sources emit different quantities of light, then the lighting device can cover a wider range of illumination needs, but luminance uniformity deteriorates
Solution Approach 1:
The patent applies local quality by making each lens have a different size according to the light output of its corresponding light source. Lenses closer to the center are larger while those at the edges are smaller, creating a non-uniform lens array that compensates for the non-uniform light distribution from the LED strip, thereby achieving uniform luminance across the illumination surface.
2Illumination intensity
If lens sizes are made proportional to light source quantities, then luminance uniformity improves, but device complexity increases
Solution Approach 1:
The patent implements parameter changes by systematically varying the lens size parameter across the lens array. Instead of using uniform lenses, the lens diameter is changed as a function of position (larger at center, smaller at edges), creating a gradient structure that simplifies the overall system by eliminating the need for complex optical elements or multiple light source types.
3Illumination intensity
If separation distances between light sources are varied, then luminance distribution improves, but manufacturing precision requirements increase
Solution Approach 1:
The patent applies asymmetry by using an asymmetric lens arrangement where lenses are positioned and sized differently based on their location in the array. The separation distances between lenses are not uniform, with larger gaps at the edges and smaller gaps at the center, creating an asymmetric structure that compensates for the natural light distribution pattern from linear LED arrangements.
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
Improves luminance and color uniformity, preventing yield reduction by optimizing lens sizes and separation distances based on light source intensity, enhancing user experience and device performance.
Implementation Method 1
an optical sheet for diffusing light, ensuring consistent illumination
Data Source
AI summary
An embodiment comprises: a housing comprising a lower plate and a side plate; a substrate arranged on the lower plate; a light-emitting module comprising light sources arranged on the substrate and spaced from each other; and a lens array unit comprising lenses arranged so as to correspond to the light sources. The light sources have different magnitudes of quantity of light, and the sizes of the lenses are proportional to the magnitudes of quantity of light of the corresponding light sources.