Automotive Air Vent Light Guide Uniform Illuminance
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Solution Overview
Problem
Existing light emitting devices for automobile air vents suffer from non-uniform illuminance due to the alignment of the irradiation hole, diffusion plate, and light guide, resulting in uneven light distribution and a degraded appearance of the vehicle interior, which lowers marketability.
Innovation Solution
A light emitting device with a shielding protrusion and refraction protrusion is integrated into the air vent housing, allowing the light guide to extend with a locking protrusion and inflow portion to control light intensity and refract it uniformly through the irradiation hole, ensuring consistent illuminance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the irradiation hole, diffusion plate, and light guide are formed in the same length, then the structure is simple and easy to manufacture, but the light distribution becomes non-uniform with bright spots and dark areas
Solution Approach 1:
The light guide is segmented into different length portions: a first length portion that extends to the rear surface of the diffusion plate and a second length portion that extends beyond it. This segmentation allows different regions of the light guide to serve different functions - the first portion for light guidance and the second portion for additional light diffusion - thereby achieving uniform light distribution while maintaining manufacturing simplicity
Solution Approach 2:
Different portions of the light guide are given different lengths to create local quality variations. The first length portion has a specific length matching the diffusion plate thickness, while the second length portion extends beyond it. This local variation in geometry enables the system to simultaneously achieve simple manufacturing and uniform light distribution by optimizing light paths in different regions
2Illumination intensity
If the light guide extends beyond the diffusion plate, then light distribution uniformity is improved, but the device complexity increases
Solution Approach 1:
The light guide is designed as a single integrated component that combines both the first length portion (extending to the rear surface of the diffusion plate) and the second length portion (extending beyond it). This merging approach achieves uniform light distribution through the extended structure while avoiding the need for separate components, thereby limiting the increase in device complexity
Solution Approach 2:
The extended second length portion of the light guide serves multiple functions: it provides additional light guidance paths, acts as an additional light diffusion medium, and maintains structural continuity with the first length portion. This multi-functionality achieves improved light distribution uniformity without proportionally increasing device complexity
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 solution achieves uniform light distribution across the air vent housing, enhancing the vehicle's interior appearance and marketability by maintaining consistent illuminance as intended by the designer.
Implementation Method 1
a refraction protrusion (213) protruding outward is formed in the extension portion (210) such that the light emitted from the LED (100) may be irradiated at the same illuminance through the irradiation hole (410) while being refracted by the refraction protrusion (213)
Implementation Method 2
a diffusion plate (300) for widely diffusing the light guided by the light guide (200)
Data Source
AI summary
The present invention comprises: an LED; a light guide; a diffusion plate; and an air vent housing, wherein at least one shielding protrusion having a receiving portion is formed to protrude from the rear of the air vent housing having the irradiation hole formed therethrough into which the diffusion plate is inserted to be fixed, wherein a bent extension portion is formed to extend from one side of the light guide such that a locking protrusion inserted into the receiving portion formed in the shielding protrusion protrudes from the front thereof and an inflow portion, through which the light generated from the LED is introduced, protrudes from the rear thereof.