Vehicle Light Fitting Unit with Reflecting Plane for Uniform Illumination
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Solution Overview
Problem
Conventional vehicle light fitting units experience uneven light emission due to the reflection of light by dots on the rear face of the light guiding body, resulting in brighter areas near the reflecting dots and darker areas elsewhere, leading to non-uniform illumination from the front face.
Innovation Solution
A vehicle light fitting unit design featuring a plurality of light sources with a reflecting plane that diffusely reflects light, and a lens that emits the diffusely reflected light to the front direction, where the pitch between light sources is shorter than the light path length to the lens, eliminating the need for separate light entering lenses and allowing for even light distribution.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If light is reflected by reflecting dots on the rear face of the light guiding body, then light can be directed to the front face, but brightness unevenness occurs between areas near the reflecting dots and other areas
Solution Approach 1:
The patent removes the reflecting dots from the rear face of the light guiding body and replaces them with a reflecting plane positioned separately. This extraction eliminates the source of brightness unevenness while preserving the light redirection function, as the plane reflects light from the bottom surface to the front surface without creating localized bright spots.
Solution Approach 2:
The patent introduces a reflecting plane as an intermediary element between the light sources and the front surface. This plane mediates the light path by reflecting light from the bottom surface upward to the front surface, achieving uniform illumination without requiring direct light source placement or rear-face reflection structures.
2Productivity
If a light guiding body with reflecting dots is used, then light can be emitted from the front face, but the structure becomes more complex and less compact
Solution Approach 1:
The patent extracts the reflection function from the light guiding body itself and places it in a separate reflecting plane. This separation simplifies the overall structure by eliminating the need for complex rear-face dot patterns while maintaining efficient light emission through the simplified plane reflection mechanism.
3Illumination intensity
If reflecting dots are provided on the rear face, then light can be directed to the front, but areas near the reflecting dots become brighter than other areas
Solution Approach 1:
The patent applies local quality by creating a uniform reflecting plane surface that treats all light paths equally, as opposed to the localized reflecting dots that created spatial variation in brightness. The plane's uniform properties ensure consistent light reflection across the entire surface, eliminating localized bright spots while maintaining directional light emission.
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 design achieves even light emission as a plane from the front face, eliminating brightness unevenness and enabling a more compact and cost-effective configuration without the need for thick lenses or reflective dots on the rear face.
Implementation Method 1
a reflecting plane which diffusely reflects light emitted from the plurality of light sources
Implementation Method 2
a lens which emits the light, which is diffusely reflected by the reflecting plane, to a front direction
Data Source
AI summary
Disclosed is a vehicle light fitting unit that can include a plurality of light sources, a reflecting plane which diffusely reflects light emitted from the plurality of light sources, and a lens which emits the light, which is diffusely reflected by the reflecting plane, to a front direction. The plurality of light sources can each be provided so that a pitch between one light source and another light source adjacent to the one light source is shorter than a light path length from the one light source to the lens passing through the reflecting plane.