Optical Member with Diffusion Portion for TIR Lens Luminance
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Solution Overview
Problem
Existing light source devices using total internal reflection (TIR) lenses suffer from luminance unevenness due to the refracting and reflecting portions, which results in three distinct luminance distributions and visual recognition of luminance unevenness.
Innovation Solution
An optical member with a refracting portion in the central portion and reflecting portions on both sides, along with a diffusion portion in regions corresponding to emitted light fluxes from these portions, is used to reduce luminance unevenness by diffusing light at the boundaries between different light fluxes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If a TIR lens with refracting portion and reflecting portion is used to condense light with large angles, then light utilization efficiency is improved, but luminance distribution becomes uneven with three distinct regions
Solution Approach 1:
The optical element is divided into distinct functional regions: a refracting portion in the central area and reflecting portions on both sides. This segmentation allows each region to handle specific light paths, with the refracting portion managing central light flux and reflecting portions handling peripheral light flux, thereby achieving uniform luminance distribution while maintaining high light utilization efficiency
Solution Approach 2:
Different portions of the optical element are assigned different optical functions based on their location. The central refracting portion and side reflecting portions have different shapes and orientations optimized for their specific roles in controlling light flux from different regions of the light emitting element, achieving localized optimization of light distribution
2Speed
If refracting portion and reflecting portion are used to control light flux, then light directionality is improved, but luminance unevenness increases at boundaries between light flux regions
Solution Approach 1:
The refracting portion and reflecting portions are combined in a single optical element structure. The refracting portion is disposed in a central area while reflecting portions are disposed on both sides, creating an integrated optical system that simultaneously controls light flux directionality and eliminates luminance unevenness at boundaries through coordinated action of all portions
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 optical member effectively reduces luminance unevenness by diffusing light at the boundaries between different light fluxes, resulting in a uniform luminance distribution and improved utilization efficiency of light flux.
Implementation Method 1
an optical element in which a refracting portion disposed in a central portion and a reflecting portion disposed on both sides of the refracting portion extend in a predetermined direction
Implementation Method 2
a reflecting portion disposed on both sides of the refracting portion
Implementation Method 3
a diffusion portion provided in at least one of a region corresponding to an emitted light flux from the refracting portion of the optical element and a region corresponding to an emitted light flux from the reflecting portion
Data Source
AI summary
An optical member includes an optical element and a diffusion portion. In the optical element, a refracting portion disposed in a central portion and a reflecting portion disposed on both sides of the refracting portion extend in a predetermined direction. The diffusion portion is provided in at least one of a region corresponding to an emitted light flux from the refracting portion of the optical element and a region corresponding to an emitted light flux from the reflecting portion.