Vehicle Lamp Light Guide Uniform Emission via Diffusing Agent
Solution Overview
Problem
Existing vehicle lamp light guides struggle with achieving uniform surface emission due to the use of reflective elements like steps, which complicate uniform light distribution and increase manufacturing complexity.
Innovation Solution
A light guide design incorporating a rod-shaped portion and a plate-shaped portion connected by a projecting bonding surface, where the plate-shaped portion contains a light diffusing agent, allowing for more uniform light emission without the need for reflective elements.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If reflective elements like steps are used to emit light from the light guide, then light can be directed toward the front of the lamp, but uniform surface emission from the light guide becomes difficult to achieve
Solution Approach 1:
The invention removes the reflective element (step) from the light guide structure. Instead of using a step to reflect light, the patent employs a simple plate-shaped light guide with light entering through its side surface and emitting through its front surface, eliminating the source of non-uniform emission while maintaining light directionality
Solution Approach 2:
The invention changes the optical parameters of the light guide by controlling the refractive index distribution and light entry conditions. By adjusting the light entry angle and intensity distribution on the side surface, uniform emission from the front surface is achieved without requiring reflective elements
2Illumination intensity
If reflective elements are used in the light guide structure, then light can be emitted from the light guide, but the device complexity increases due to additional optical components
Solution Approach 1:
The reflective element is completely removed from the system. The light guide functions solely as a light transmission and redistribution medium, with light entering through the side surface and exiting through the front surface, eliminating the need for any reflective components
Solution Approach 2:
The plate-shaped light guide performs multiple functions: it guides light from the light source, redistributes the light uniformly across its surface, and directs emission toward the front. This multi-functionality eliminates the need for separate reflective elements
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 design enhances surface emission uniformity, improves light distribution, and simplifies manufacturing by eliminating the need for optical adjustments and reflective elements, resulting in a more reliable and visually effective vehicle lamp.
Implementation Method 1
the plate-shaped portion is formed of a second resin material containing a light diffusing agent
Data Source
AI summary
A light guide for a vehicle lamp includes a rod-shaped portion and a plate-shaped portion. The rod-shaped portion includes a rod-shaped light guide portion and a connecting projection portion projecting from a peripheral surface of the rod-shaped light guide portion and extending along the rod-shaped light guide portion. The plate-shaped portion includes two principal surfaces facing opposite to each other and a plate-shaped portion side surface connecting the two principal surfaces. The light guide is a multi-color molded product in which the rod-shaped portion is formed of a first resin material and the plate-shaped portion is formed of a second resin material containing a light diffusing agent. The rod-shaped light guide portion is connected to the side surface of the plate-shaped portion by the connecting projection portion.