Vehicular Headlamp Single Lens Separating Wall
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Solution Overview
Problem
The existing vehicular headlamps with separate fixed and variable light distribution units arranged side by side lead to upsizing issues, and integrating them with a single lens complicates light distribution due to interference between light paths.
Innovation Solution
A vehicular headlamp design that integrates the first and second light distribution portions with a micro electro mechanical system mirror and a single lens, using a separating wall to shield light and prevent interference, allowing for appropriate light distribution while restraining upsizing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the fixed light distribution unit and the variable light distribution unit are arranged side by side, then light distribution can be performed in each unit, but the headlamp size increases
Solution Approach 1:
The patent combines the fixed light distribution unit and variable light distribution unit into a single integrated headlamp assembly, sharing common components including a single lens, holding member, and housing. This merging approach maintains separate light distribution functions while reducing overall headlamp volume by eliminating duplicate structures.
2Volume of moving object
If the fixed light distribution unit and the variable light distribution unit are integrated with a single lens, then headlamp size is reduced, but light paths interfere with each other
Solution Approach 1:
The patent segments the internal space of the single lens into distinct optical paths for the fixed and variable light distribution units. By providing separate light transmission paths within the integrated lens structure, each unit's light can be directed independently without interference, maintaining light distribution accuracy while benefiting from the compact integrated design.
Solution Approach 2:
The patent introduces intermediate optical elements and structural features within the single lens that act as mediators to separate and guide light from the fixed and variable units along distinct paths. These intermediary structures ensure that light from each unit reaches its intended destination without cross-interference, enabling successful integration.
3Ease of manufacture
If a single lens is used for both light distribution units, then manufacturing is simplified, but light from one unit may pass through the wrong portion of the lens
Solution Approach 1:
The patent applies local quality differentiation within the single lens by creating distinct optical zones or regions with different optical properties or geometries tailored to each light distribution unit's requirements. This allows the lens to be manufactured as a single piece while incorporating localized features that ensure light from each unit passes through the appropriate portion, achieving both manufacturing simplicity and precise light path control.
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 effectively prevents light interference between the fixed and variable light distribution units, enabling appropriate light distribution and reducing the headlamp's size, thus addressing the upsizing issue while maintaining effective illumination patterns.
Implementation Method 1
a second light distribution portion including a second light source and an micro electro mechanical system mirror, the second light distribution portion being configured to distribute light toward the vehicle front side with a predetermined light distribution pattern by reflecting, by the micro electro mechanical system mirror, light projected by the second light source
Implementation Method 2
the first lens portion being constituting a vehicle-front-side portion of the first light distribution portion and configured such that the light projected by the first light source is passed through the first lens portion
Implementation Method 3
the second lens portion being constituting a vehicle-front-side portion of the second light distribution portion and configured such that the light reflected by the micro electro mechanical system mirror is passed through the second lens portion
Data Source
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AI summary
A vehicular headlamp includes: a first light distribution portion (16A) including a first light source (22); a second light distribution portion (16B) including a second light source (24) and an micro electro mechanical system mirror (30); a holding member (18) configured to hold the first light source (22), the second light source (24), and the micro electro mechanical system mirror (30); a single lens (32) including a first lens portion (32A) and a second lens portion (32B); and a separating wall (20) formed in the holding member (18) so as to protrude toward the vehicle front side relative to the holding member (18), the separating wall (20) being configured to separate a region between the first lens portion (32A) and the holding member (18) from a region between the second lens portion (32B) and the holding member (18).