Vehicle Lamp Optical Path Change Portion Fills Dark Zones
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Solution Overview
Problem
Conventional vehicle lamps experience unnatural feelings for drivers during high-beam irradiation due to dark portions between low-beam and high-beam light distribution patterns, inefficient light utilization, and reduced product life due to high-temperature exposure of high-beam light sources.
Innovation Solution
A vehicle lamp configuration with a projector lens, first and second light sources, a shade, and an optical path change portion to minimize dark portions and enhance light utilization, including a separate optical member for improved light reflection and a substrate with specific wiring patterns to manage heat.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If a shade is disposed behind the projector lens to form a cutoff line of the low-beam light distribution pattern, then the low-beam light distribution pattern is formed, but a dark portion occurs between the low-beam light distribution pattern and the additional high-beam light distribution pattern
Solution Approach 1:
An optical path change portion is introduced as an intermediary element between the second light source and the projector lens. This optical path change portion refracts and redirects light from the second light source to fill the dark portion between the low-beam and additional high-beam light distribution patterns, eliminating the harmful effect while preserving the intended light distribution patterns.
2Illumination intensity
If the arrangement location of the high-beam light source is determined in a limited design space to avoid the path of light for forming the low-beam light distribution pattern, then the low-beam light distribution pattern is formed, but the utilization efficiency of light emitted from the high-beam light source is lowered
Solution Approach 1:
The optical path change portion serves as a mediator that allows the second light source to be positioned in an optimized location for high-beam light distribution while efficiently transmitting light to the projector lens. This intermediary element enables better light utilization efficiency without compromising the low-beam light distribution pattern.
3Illumination intensity
If the high-beam light source is exposed to high temperature equal to or higher than the product conditions for a long time during operation, then the additional high-beam light distribution pattern is formed, but the performance of the light source is degraded and the product life of the vehicle lamp decreases
Solution Approach 1:
The lamp system is segmented into separate light sources for low-beam and high-beam functions, each with dedicated optical paths. The optical path change portion is specifically designed to handle high-beam light separately, allowing for optimized thermal management and reduced heat exposure for the second light source, thereby extending product life.
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 reduces unnatural feelings for drivers, improves light utilization efficiency, and extends the product life of vehicle lamps by minimizing dark portions and effectively managing heat exposure.
Implementation Method 1
an optical path change portion configured to change an optical path of a part of light emitted from the second light source so as to travel toward a portion between the low-beam light distribution pattern and the additional high-beam light distribution pattern
Data Source
AI summary
A vehicle lamp configured to selectively perform a low-beam irradiation and a high-beam irradiation includes a projector lens, a light emitting element disposed behind the projector lens and configured to emit light for forming a low-beam light distribution pattern, a light emitting element disposed behind the projector lens and configured to emit light for forming an additional high-beam light distribution pattern, a upward reflecting surface (shade) disposed behind the projector lens and configured to form a cutoff line of the low-beam light distribution pattern, and an optical path change portion configured to change an optical path of a part of light emitted from the light emitting element so as to travel toward a portion between the low-beam light distribution pattern and the additional high-beam light distribution pattern.