Vehicle Headlamp Screen Layout for Front Signaling Integration
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Solution Overview
Problem
Existing vehicle headlamps with lighting functions placed behind signaling functions are complex to implement and prone to faults, and the use of a transparent screen between the light source and outer lens can disturb the perception of lighting functions and allow external light radiation to interfere.
Innovation Solution
A headlamp design featuring a transparent screen between the lighting module and outer lens, with optical modules on the internal face to scatter light and a light-absorbing element to reduce external interference, allowing the signaling function to be positioned in front of the lighting function without disturbing it, and using a tinted outer lens to minimize external reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a transparent screen is placed between the lighting module and outer lens to create a signaling function, then the signaling function is improved, but the perception of the lighting function is disturbed
Solution Approach 1:
The screen is designed with spatially varying optical properties: the upper portion has higher optical density to block light from reaching the lighting module, while the lower portion has lower optical density to allow light transmission. This local differentiation enables the screen to simultaneously serve as a signaling element and a non-interfering optical component for the lighting function.
Solution Approach 2:
The solution transitions from a two-dimensional planar screen to a three-dimensional structured screen with varying optical density through its thickness. The screen's optical properties change along the light propagation direction, creating different optical zones that perform different functions - blocking in the upper region and transmitting in the lower region.
2Adaptability or versatility
If a transparent screen is used between the lighting module and outer lens, then the signaling function is achieved, but external light radiation interferes with the lighting function
Solution Approach 1:
The screen exhibits local quality variation where the upper portion has high optical density to block external light radiation from reaching the lighting module, while the lower portion maintains low optical density to allow necessary light transmission. This spatial differentiation resolves the contradiction between blocking external interference and maintaining lighting function.
Solution Approach 2:
The screen converts the potentially harmful effect of light blocking into a beneficial function by selectively blocking external light radiation in the upper region while maintaining light transmission in the lower region. The same screen structure that blocks light is used to create the signaling function, turning a limitation into a dual-purpose feature.
3Ease of manufacture
If the screen runs parallel to or conforms to the shape of the outer lens, then the manufacturing is simplified, but the main light source remains visible to observers
Solution Approach 1:
The screen is positioned at a specific angle relative to the optical axis rather than parallel to the outer lens, creating a tilted configuration. This angular positioning, combined with local optical density variation, blocks the line of sight to the main light source while maintaining manufacturing feasibility through standard screen mounting techniques.
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 design effectively separates and optimizes the signaling and lighting functions, reducing external light interference and maintaining the aesthetic appearance while ensuring the lighting function is not disturbed, allowing for a more compact and efficient headlamp design.
Implementation Method 1
an internal face of the screen, which face is situated facing said at least one lighting module, is equipped with a plurality of optical modules that scatter the light emitted by the at least one light source toward the outer lens
Implementation Method 2
the screen makes, with the optical axis of said at least one lighting module, a second angle such that part of the cone of light from the beam of light, which part is situated beneath the optical axis when the headlamp is in a position of use, is reflected by the screen toward said lighting module above same
Implementation Method 3
the headlamp may comprise, inside the housing, a light-absorbing element placed in a part of the housing that is situated above the optical axis in the position of use of the headlamp, notably above the cone of light, this absorbing element extending over a sufficient surface area to receive that part of the cone of light from the beam of light which part is emitted by said at least one lighting module and reflected by the screen
Data Source
AI summary
A vehicle headlamp includes a housing closed by a transparent outer lens and, inside the housing, a lighting module that emits a light beam in the direction of an optical axis defining a cone of light and a transparent screen that is positioned between the lighting module and the outer lens and receives, in its thickness, a light beam emitted by a light source. An internal face of the screen is provided with optical modules that reflect the light emitted by the light source in the direction of the outer lens. The outer lens forms a first angle of 60 to 100° with the optical axis of the lighting module and the screen forms a second angle such that a part of the cone of light of the light beam that is situated beneath the optical axis is reflected by the screen above the lighting module.