Light Guiding Member Deflection Portions for Uniform Illumination
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Solution Overview
Problem
Existing light guiding members in illumination devices suffer from non-uniform light intensity distribution due to uneven structures and held portions, leading to diffuse reflection and reduced light use efficiency.
Innovation Solution
A light guiding member with a plurality of deflection portions arrayed in a specific direction, where the density or depth of these portions differs between regions corresponding to held portions and adjacent regions, effectively reducing stray light and achieving uniform light distribution while maintaining light use efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the uneven structure is painted black to reduce diffuse reflection and stray light, then light uniformity is improved, but light use efficiency deteriorates due to light absorption
Solution Approach 1:
The patent applies local quality by creating deflection portions with different densities or depths in different regions of the light guiding member. Specifically, the first region corresponding to the held portion has a different deflection portion density or depth compared to the second region, allowing localized control of light distribution to compensate for held portion effects without requiring black painting throughout the entire structure.
Solution Approach 2:
The patent changes the physical parameters (density or depth) of deflection portions in different regions to achieve uniform light distribution. By adjusting these geometric parameters rather than changing the surface color to black, the patent maintains light use efficiency while achieving the desired uniformity in light intensity distribution.
2Ease of operation
If a held portion is formed on the side surface to enable mounting, then ease of operation is improved, but light uniformity deteriorates due to stray light and diffuse reflection
Solution Approach 1:
The patent addresses the light uniformity issue caused by the held portion by applying different deflection portion characteristics to different regions. The first region corresponding to the held portion has different deflection portion density or depth compared to adjacent regions, allowing the held portion to be accommodated while maintaining overall light uniformity through localized structural adjustment.
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 achieves substantially uniform light intensity distribution along the illuminated surface, reducing local increases in light amount caused by held portions and maintaining high light use efficiency.
Implementation Method 1
a light guiding surface opposed to the exit surface, and being configured to guide light entering the incident surface to the exit surface
Implementation Method 2
a plurality of deflection portions arrayed in the first direction on the light guiding surface
Data Source
AI summary
Provided is the light guiding member including an incident surface, an exit surface extending in a first direction, a light guiding surface opposed to the exit surface, and being configured to guide light entering the incident surface to the exit surface, a side surface connecting the exit surface and the light guiding surface, and a held portion formed on the side surface. The light guiding surface includes a plurality of deflection portions arrayed in the first direction. At least one of a density or a depth of each of the plurality of deflection portions differs between a first region on the light guiding surface, which corresponds to a region at which the held portion is present in the first direction, and a second region on the light guiding surface adjacent to each of both sides of the first region in the first direction.