Diffusive Projection Lens for Uniform Automotive Lamp Cut-Offs
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Solution Overview
Problem
Conventional vehicle lamps require complex optical elements to achieve uniform lighting and sharp cut-offs, which increases weight and complicates production, and cannot incorporate diffusive materials without degrading performance.
Innovation Solution
An optical system using a single diffusive projection lens and shaping reflector to perform primary and secondary lighting functions without complex optical elements, incorporating a diffusive material to sharpen the cut-off and add sign light, while maintaining primary lighting performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If complex optical elements are added to the projection lens to achieve uniform lighting and sharp cut-offs, then lighting performance is improved, but device complexity and manufacturing difficulty increase
Solution Approach 1:
The patent changes the material parameter of the projection lens by using diffusive material instead of conventional clear optical material. This parameter change enables the lens to achieve uniform lighting distribution and sharp cut-offs through light diffusion properties, eliminating the need for complex optical elements while maintaining or improving lighting performance.
Solution Approach 2:
The patent employs composite material structure by combining diffusive material with optical material in the projection lens. This composite approach allows the lens to simultaneously achieve light diffusion for uniformity and optical clarity for beam shaping, resolving the contradiction between lighting performance and device complexity.
2Illumination intensity
If diffusive materials are added to the projection lens to improve lighting uniformity, then lighting function is enhanced, but lens thickness and weight increase
Solution Approach 1:
The patent utilizes the light diffusion parameter of the material to achieve uniform lighting. By selecting diffusive material with appropriate optical properties, the lens can achieve the desired lighting uniformity without requiring increased thickness, thereby avoiding additional weight while maintaining the enhanced lighting function.
3Illumination intensity
If diffusive materials are added to the projection lens to achieve uniform lighting, then lighting uniformity is improved, but production complexity increases
Solution Approach 1:
The patent changes the material parameter to diffusive material, which inherently provides uniform lighting distribution. This simplifies the manufacturing process compared to conventional approaches that require precise assembly of multiple optical elements, as the diffusive material achieves the lighting uniformity effect through its material properties alone, reducing production 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 system achieves uniform lighting and sharp cut-offs with improved beam pattern uniformity and added sign light, without degrading primary lighting functions, using a thin diffusive projection lens and shaping reflector.
Implementation Method 1
a second optical element that is configured to project a light beam transmitted from the one or more first optical elements... at least a portion of the second optical element is made of a diffusive material... perform a second lighting function by scattering the light rays received from the number of secondary light sources
Implementation Method 2
one or more first optical elements that reflect light rays emitted from a number of first light sources... the one or more first optical elements are shaping reflectors
Data Source
Figure 1
Figure 2~3A
Figure 3B~3C
AI summary
Automotive optical system (100) including first optical elements (110) that reflect light from first light sources (140a) that are configured to perform a first lighting function and a second optical element (120); the second optical element (120) projects a light beam from the first optical elements (110) that perform the first lighting function and where a portion of the second optical element (120) is made of a diffusive material. Furthermore, the optical system (100) includes secondary light sources (140b) where the second optical element (120) receives light rays from the secondary light sources (140b) and performs a second lighting function by scattering light rays received from the secondary light sources (140b).