Light Source Device Uniform Illumination via Absorption Member
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Solution Overview
Problem
Existing illumination devices face non-uniform luminance issues when LEDs with different optical properties are used without modifying the lens unit, leading to high luminance near the optical axis and significant differences in luminance between the axis and peripheral areas, resulting in non-uniform illumination.
Innovation Solution
A light source device comprising a substrate, a light source, an optical element, and a light absorption member, where the optical element controls light distribution and the light absorption member is strategically positioned to absorb light, reducing luminance near the optical axis and maintaining even illumination across the area.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If LEDs with different optical properties are used without modifying the lens unit, then the device can accommodate different LED types, but the luminance becomes non-uniform with high luminance near the optical axis
Solution Approach 1:
The patent applies local quality by positioning a light absorption member at a specific location (between the substrate and the optical element, or at the periphery of the optical element) to selectively absorb light only in the high-luminance region near the optical axis. This local intervention adjusts the light distribution without affecting other areas, achieving uniform luminance while maintaining compatibility with different LED types.
Solution Approach 2:
The light absorption member acts as an intermediary element that mediates between the LED light source and the optical element. It selectively absorbs excess light in specific regions, thereby controlling the overall light distribution and achieving uniform luminance without requiring modification of the optical element itself.
2Illumination intensity
If the lens unit is designed for specific LED optical properties, then optimal light distribution is achieved, but the device cannot accommodate LEDs with different optical properties
Solution Approach 1:
The patent achieves universality by making the light absorption member a configurable component that can be adjusted or removed based on the LED type used. The absorption member's position, size, and material properties can be modified to accommodate different LED optical characteristics, allowing the same basic structure to work with various LED types while maintaining optimal light distribution.
Solution Approach 2:
The patent applies parameter changes by adjusting the optical properties (absorption coefficient, position, size) of the light absorption member to match different LED types. By changing these parameters, the system can accommodate LEDs with different emission angles and luminance characteristics without requiring redesign of the entire optical system.
3Area of stationary object
If the lens unit expands light from LEDs, then the illumination area increases, but luminance becomes non-uniform between the optical axis and peripheral areas
Solution Approach 1:
The patent applies local quality by placing the light absorption member specifically in regions where excess light needs to be reduced (near the optical axis or at the periphery of the optical element). This localized absorption corrects the non-uniform luminance distribution caused by light expansion, ensuring uniform illumination across the entire area without compromising the expanded illumination coverage.
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 suppresses non-uniform luminance by adjusting light distribution and absorption, ensuring consistent illumination even when LEDs with varying optical properties are used, without the need for modifying optical elements.
Implementation Method 1
a light absorption member that absorbs light
Implementation Method 2
the optical element transmits the light emitted by the light source so that the transmitted light exits the optical element through the light-exiting face
Data Source
AI summary
A light source device includes: a substrate; a light source on the substrate, the light source emitting light in a direction away from the substrate; an optical element covering the light source on an opposite side of the light source from the substrate to control distribution of the light emitted by the light source; and a light absorption member that absorbs light, wherein the optical element has a bottom face on a substrate side thereof and a light-exiting face on an opposite side of the bottom face from the substrate, the optical element transmits the light emitted by the light source so that the transmitted light exits the optical element through the light-exiting face, and the light absorption member is disposed between the substrate and the bottom face.