Light Guide Exit Structure for Moire-Suppressed Optical Members
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Solution Overview
Problem
Existing optical members used as blind spot auxiliary devices suffer from the occurrence of moire due to the relationship between the reflected light pattern at the exit section and the structural pattern of the exit section.
Innovation Solution
The optical member incorporates a light guide with a step-shaped reflective surface and prism parts alternately arranged in the exit section, which divides and reflects incident light in a manner that significantly differs from the pattern interval of the prism parts and flat parts, thereby reducing moire occurrence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a regular reflective surface and prism structure are used in the exit section, then the optical member can reflect and emit light effectively, but moire patterns occur due to the relationship between the reflected light pattern and the structural pattern
Solution Approach 1:
The patent applies local quality by creating two distinct regions in the exit section: a first region with step-shaped reflective surfaces that have multiple flat surfaces at different heights, and a second region with standard prism parts. This local differentiation allows the first region to disrupt the periodic pattern causing moire while the second region maintains effective light emission, thus resolving the contradiction between reliability and moire suppression.
Solution Approach 2:
The exit section is segmented into multiple regions with different structures. The first region contains step-shaped reflective surfaces with flat surfaces at different heights, while the second region contains standard prism parts. This segmentation allows different functional zones to address different aspects of the problem: one zone suppresses moire patterns while another maintains light emission effectiveness.
2Object-affected harmful factors
If the exit section structure is modified to suppress moire, then moire patterns are reduced, but the light emission efficiency may be affected
Solution Approach 1:
The patent merges two different structural approaches in the exit section: step-shaped reflective surfaces for moire suppression and standard prism parts for efficient light emission. By combining these two structures in adjacent regions, the invention achieves both moire suppression and maintained light emission efficiency, resolving the contradiction between reducing harmful factors and preventing energy loss.
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
This configuration effectively suppresses the occurrence of moire in the optical member, ensuring improved visibility of the blind spot area by maintaining the visibility of the scene viewed at the exit section.
Implementation Method 1
a first region having a step-shaped reflective surface and a prism part alternately arranged adjacent to each other. The step-shaped reflective surface has a plurality of flat surfaces located at different heights through a step portion
Implementation Method 2
The exit section has a first region adjacent to the entrance surface and a second region adjacent to the first region. The first region has a step-shaped reflective surface and a prism part alternately arranged adjacent to each other
Data Source
AI summary
An optical member includes a light guide made of a light-transmitting material. The light guide has an entrance surface, an exit section that outputs a part of light incident from the entrance surface to outside, a smooth surface opposite to the exit section, and a terminal surface located opposite to the entrance surface to connect the exit section and the smooth surface. The exit section has a first region adjacent to the entrance surface and a second region adjacent to the first region. The first region has a step-shaped reflective surface and a prism part alternately arranged adjacent to each other. The step-shaped reflective surface has plural flat surfaces located at different heights through a step portion.