Light Distribution Member for Motor Vehicle Signaling
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Solution Overview
Problem
Current lighting and signaling devices for motor vehicles face challenges in achieving a balance between optical efficiency and regulatory requirements for wide emergent light distribution, especially when the optical element's light emergence surface is larger than 60 mm and only has one light incidence surface, making it difficult to meet both lighting and signaling functions effectively.
Innovation Solution
A light distribution member with a main body part featuring a light incidence surface, a light emergence surface, and reflective side surfaces with strategically placed reflective structures that direct light at different angles to achieve the desired light distribution, allowing for a single light incidence surface to meet regulatory requirements for both position lamps and turn signal lamps.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If multiple light incidence surfaces are provided to achieve wide emergent light range and improve optical efficiency, then the illumination range and optical efficiency are improved, but the number of light sources must be increased resulting in increased costs
Solution Approach 1:
The single light incidence surface is segmented into multiple functional zones: a first light incidence region that allows light to pass through directly, and a second light incidence region with reflective structures that reflect light at different angles. This segmentation enables multiple light paths from a single light source, achieving wide illumination range without requiring multiple light sources.
Solution Approach 2:
The single light incidence surface performs multiple functions: it serves as both a direct transmission path for forward light and a reflective path for angled light through the second region. This multi-functionality allows one light source to achieve the effects previously requiring multiple light sources, reducing costs while maintaining wide illumination range.
2Area of stationary object
If the optical element's light emergence surface is made larger to meet regulatory requirements for position lamp and turn signal lamp, then the visibility and regulatory compliance are improved, but it becomes difficult to balance optical efficiency and emergent light distribution with only one light incidence surface
Solution Approach 1:
Different regions of the light incidence surface are assigned different optical properties: the first light incidence region has high transmission quality for direct forward light, while the second light incidence region has high reflectivity for angled light. This local differentiation enables the large light emergence surface to meet regulatory requirements while maintaining balanced light distribution through the reflective structures.
3Manufacturing precision
If reflective structures are added to direct light at different angles to meet regulatory emergence angle requirements, then the light distribution control and regulatory compliance are improved, but the device complexity increases
Solution Approach 1:
The reflective structures are merged with the light incidence surface to form an integrated optical element. Instead of adding separate reflective components, the reflective regions are incorporated directly into the incidence surface design, achieving precise light distribution control while minimizing device complexity through 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
This solution enables effective light distribution that meets regulatory requirements for emergence angles, such as 25 degrees and 80 degrees, while maintaining optical efficiency and reducing costs by allowing a single light incidence surface to be used, thereby enhancing driving safety and simplifying installation.
Implementation Method 1
at least one of the first side surface and the second side surface is provided with at least one first reflective structure configured to reflect the light reaching it, and to direct the reflected light as a second light beam toward the light emergence surface
Data Source
AI summary
Provided are a light distribution member, a lighting or signaling device having the same, and a motor vehicle. A main body part of the light distribution member defines: a light incidence surface, through which light from a light source enters the main body part; a light emergence surface, a portion of the light entering the main body part being allowed to reach the light emergence surface directly in such a way that the portion of the light acts as a first light beam that is at least substantially parallel; and a first side surface and a second side surface, which are reflective faces and arranged on either side of an axis (O-O′), wherein at least one of the first side surface and the second side surface is provided with at least one first reflective structure configured to reflect the light reaching it, and to direct the reflected light as a second light beam toward the light emergence surface, and wherein an angle of the first light beam relative to the axis (O-O′) is different from an angle of the second light beam relative to the axis (O-O′).