Multi-layer Light Guide with Refractive Index Gradients
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Solution Overview
Problem
Conventional double-layer light guide devices experience energy loss due to changes in critical angles between layers, leading to inefficient light output.
Innovation Solution
A multi-layer light guide apparatus with layers of varying refractive indices, where the first refractive index is smaller than the second, and potentially a third, allowing for optimized critical angles and micro-structured surfaces to minimize light loss and enhance light output.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a double-layer light guide device is used, then light guidance capability is improved, but light loss increases due to critical angle changes between layers
Solution Approach 1:
The patent applies parameter changes by precisely controlling the refractive indices of different layers and their thicknesses to optimize critical angle relationships. By adjusting these parameters, the invention achieves better light output while minimizing light loss at layer interfaces through optimized refraction and reflection angles.
Solution Approach 2:
The invention uses composite materials with different refractive indices arranged in multiple layers. Each layer is made of materials specifically selected to achieve desired optical properties, creating a composite structure that optimizes light guidance while reducing energy loss at interfaces.
2Productivity
If multiple layers with different refractive indices are arranged from greater to smaller, then light output efficiency is improved, but device complexity increases
Solution Approach 1:
The patent applies segmentation by dividing the light guide device into multiple distinct layers, each with specific refractive index ranges and thicknesses. This segmentation allows optimization of light guidance in each layer while maintaining overall system efficiency, with the first layer having refractive index 1.40-1.60, second layer 1.50-1.70, and third layer 1.55-1.75.
Solution Approach 2:
The invention systematically varies key parameters including refractive indices, layer thicknesses (first layer: 0.5-5.0mm, second layer: 0.5-10.0mm, third layer: 0.5-15.0mm), and critical angles to optimize light emission efficiency while managing device complexity through controlled parameter ranges.
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 multi-layer design reduces light loss by up to 20% and increases light emission efficiency, with specific critical angle relationships and micro-structured layers ensuring effective refraction and reflection for improved light output.
Implementation Method 1
When any light enters the micro-structured layer, the light may be guided out from the light guide apparatus after refraction and full reflection
Implementation Method 2
When any light enters the micro-structured layer, the light may be guided out from the light guide apparatus after refraction and full reflection
Data Source
AI summary
Provided is a multi-layer light guide apparatus. Various optical paths are formed as a light source emits light into the apparatus. Main structure of the apparatus includes a body and a micro-structured layer. The body has a first layer with first refractive index (n1) and a second layer with second refractive index (n2). The first layer has a first critical angle (θC1). An interface critical angle (θC12) is formed between the associated first layer and second layer. The light then outputs as the light propagates through the layers. The micro-structured layer is formed on a side of the body. It features:n1<n2;0<|θC12−θC1|≦35°;A third layer with a third index of refraction (n3) is further included. A second interface critical angle (θC23) is formed between the second layer and the third layer. It features:n1<n2<n3;θC23>θC12;0<|θC12−θC1|≦35°.