Vehicular Lamp Light Guide Single Source Distribution
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Solution Overview
Problem
Conventional vehicular lamps require multiple light sources to output light from multiple light guide portions, increasing costs.
Innovation Solution
A vehicular lamp design that uses a light guide body with reflective surfaces to distribute light from a single light source to multiple light guide portions, allowing for simultaneous dot-shaped and line-shaped light emissions without separate light sources, and includes features like lens cuts and concave portions to enhance light output and unity in emission appearance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple light sources are used to output light from multiple light guide portions, then each light guide portion can emit light independently, but the cost increases
Solution Approach 1:
Multiple light guide portions are merged into a single integrated light guide body that receives light from one light source. The light guide body includes multiple light guide portions (first light guide portion, second light guide portion, etc.) that are optically connected to the light source through reflective surfaces, eliminating the need for separate light sources for each light guide portion.
Solution Approach 2:
A light guide body acts as an intermediary between the single light source and multiple light guide portions. The light guide body includes reflective surfaces (first reflective surface, second reflective surface) that distribute light from the single light source to multiple light guide portions, enabling independent light emission from each portion without requiring multiple light sources.
2Reliability
If multiple light sources are used for multiple light guide portions, then light emission is reliable, but the device complexity increases
Solution Approach 1:
Multiple light guide portions are merged into a single integrated light guide body that receives light from one light source. The light guide body includes multiple light guide portions (first light guide portion, second light guide portion, etc.) that are optically connected to the light source through reflective surfaces, eliminating the need for separate light sources for each light guide portion.
Solution Approach 2:
The single light guide body serves multiple functions by including multiple light guide portions that can emit light independently. Each light guide portion can be configured with different optical characteristics (e.g., dot-shaped emission, line-shaped emission) while being driven by a single light source, achieving multi-functionality without increasing the number of light sources.
3Adaptability or versatility
If lens cuts are arranged coarsely for dot-shaped emission and densely for line-shaped emission, then both emission patterns can be achieved, but the manufacturing precision requirements increase
Solution Approach 1:
Different regions of the light guide body have different optical characteristics achieved through different lens cut arrangements. The first light guide portion has coarsely arranged lens cuts for dot-shaped emission, while the second light guide portion has densely arranged lens cuts for line-shaped emission. This local differentiation allows each region to optimize its light emission pattern while maintaining overall system integration.
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 enables efficient light distribution and output from multiple light guide portions using a single light source, reducing costs and achieving a unified light emission appearance.
Implementation Method 1
the light guide body includes a first reflective surface configured to distribute the light that has been emitted from the light source and entered the light incident portion from the light incident surface to the first light guide portion
Implementation Method 2
the light guide body includes a second reflective surface configured to distribute the light to the second light guide portion
Implementation Method 3
the light from each of the light sources is guided through the light guide portion provided corresponding to the light source, and is outputted from the light output surface of the light guide portion
Data Source
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AI summary
A vehicular lamp (10) includes a light guide body (20) and a light source (30) that emits light to be guided through the light guide body (20). The light guide body (20) includes a first light guide portion (21), a second light guide portion (22), a light incident portion (23), a first reflective surface (24), and a second reflective surface (25). The first light guide portion (21) is a long light guide body portion including a front surface (21a) and a back surface (21b) opposite to the front surface (21a) and extending from a proximal end portion (21c) thereof to a distal end portion (21d) thereof. The second light guide portion (22) is a long light guide body portion including a front surface (22a) and a back surface (22b) opposite to the front surface (22a) and extending from a proximal end portion (22c) thereof to a distal end portion (22d) thereof. The first light guide portion (21) and the second light guide portion (22) are disposed side by side. The light incident portion (23) includes a light incident surface (23e) that faces the light source (30). The first reflective surface (24) is disposed between the light incident portion (23) and the proximal end portion (21c) of the first light guide portion (21). The second reflective surface (25) is disposed between the light incident portion (23) and the proximal end portion (22c) of the second light guide portion (22). Of the light having entered the light incident portion (23) through the light incident surface (23e), light internally reflected by the first reflective surface (24) is guided in the first light guide portion (21) from the proximal end portion (21c) to the distal end portion (21d) of the first light guide portion (21) while being repeatedly totally reflected between the front surface (21a) and the back surface (21b) of the first light guide portion (21), and light internally reflected by the second reflective surface (25) is guided in the second light guide portion (22) from the proximal end portion (22c) to the distal end portion (22d) of the second light guide portion (22) while being repeatedly totally reflected between the front surface (22a) and the back surface (22b) of the second light guide portion (22). The back surface (21b) of the first light guide portion (21) includes a plurality of first structures (21e) configured to cause the light which is being guided in the first light guide portion (21) to exit from the front surface (21 a) of the first light guide portion (21), and the back surface (22b) of the second light guide portion (22) includes a plurality of second structures (22e) configured to cause the light which is being guided in the second light guide portion (22) to exit from the front surface (22a) of the second light guide portion (22).