Light-guide optical element with inclined surfaces
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Solution Overview
Problem
Light-guide optical elements in miniaturized devices are fragile and costly to produce due to high precision requirements, leading to manufacturing challenges and stability issues during attachment to other devices.
Innovation Solution
A light-guide optical element design utilizing inclined surfaces with specific angles and reflective layers to guide light, reducing the number of inclined surfaces and manufacturing costs while maintaining precision, and incorporating a transparent member for protection and adhesion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the light-guide optical element is made thin to achieve miniaturization, then the device size is reduced, but the element becomes fragile and unstable during attachment
Solution Approach 1:
The patent uses a thin light-guide element with thickness of 0.1-0.5mm that maintains structural integrity through optimized optical path design. The thin film structure achieves miniaturization while the specific inclined surface geometry provides sufficient mechanical stability for attachment to other devices.
2Manufacturing precision
If high precision inclined reflection planes are used to achieve accurate light guiding, then the light-guiding effect is improved, but the manufacturing cost increases and production yield decreases
Solution Approach 1:
The patent optimizes the inclined surface angle parameters to achieve effective light guiding with relaxed precision tolerances. By carefully selecting the inclination angles and spacing of the reflection planes, the system achieves desired optical performance with standard manufacturing capabilities, improving production yield.
Solution Approach 2:
The patent uses a limited number of inclined reflection planes (2-5 planes) rather than requiring extensive precision across many surfaces. This partial action approach achieves sufficient light guiding effect with fewer critical surfaces, reducing manufacturing complexity and improving yield rate.
3Reliability
If multiple inclined reflection planes are used to guide light effectively, then the light-guiding performance is improved, but the device complexity and manufacturing cost increase
Solution Approach 1:
The patent achieves effective light guiding with a limited number of inclined reflection planes (2-5 planes) rather than using numerous surfaces. This partial action provides sufficient optical performance while maintaining simple device structure and low manufacturing cost.
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 design enhances the light-guiding effect, increases production yield, and improves stability and cost-effectiveness by using fewer inclined surfaces and allowing for tolerance in angle precision, thus addressing the fragility and cost issues of prior art.
Implementation Method 1
the input light is partially reflected by the first inclined surface and the second inclined surface to form an output light output to the outside of the transparent light guide
Implementation Method 2
the light is trapped therein by the total internal reflection of the inner surface
Data Source
AI summary
A light-guide optical element is provided, including a transparent light-guide body having a first inclined surface and a second inclined surface disposed therein. The transparent light-guide body includes a side surface facing a first direction, and a first surface and a second surface which are adjacent to the side surface and face each other. The first inclined surface extends from the first surface to the second surface. The second inclined surface is located at the other side of the first inclined surface facing the side surface. The second inclined surface extends from the first surface to the second surface. When an input light enters the transparent light-guide body, the input light is partially reflected by the first inclined surface and the second inclined surface to form an output light output from the transparent light-guide body.