Motor Vehicle Lighting Mask Layout for Reflection and EMI Shielding
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Solution Overview
Problem
Automotive vehicle optical systems using ultra-pixelated LED light sources face issues with light reflections, electromagnetic interference, heat dissipation, and protection from solar rays, which affect image sharpness and operation.
Innovation Solution
A luminous device with a mask between the light emitting zone and optical device to filter reflections, a protective housing design to prevent light reflections, and a mask made of a heat-dissipating material to manage heat and electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a protective housing surrounds the light ray emitting zone, then the light source is protected, but light reflections occur on the protective housing surface that degrade image sharpness
Solution Approach 1:
A mask is introduced as an intermediary element between the protective housing and the optical device. The mask absorbs or blocks reflected light rays before they reach the optical device, thereby eliminating the harmful reflections while preserving the protective housing's shielding function. This intermediary structure resolves the contradiction by adding a component that specifically addresses the reflection problem without removing the protective housing.
2Device complexity
If electronic components are situated near the light source, then the device structure is compact, but electromagnetic fields from these components disturb the light source operation
Solution Approach 1:
The mask serves a dual function: it blocks reflected light from reaching the optical device, and simultaneously acts as an electromagnetic shield protecting the light source from electromagnetic fields generated by nearby electronic components. By converting the mask into a multi-functional element with electromagnetic shielding properties, the harmful electromagnetic interference is converted into a managed condition, allowing compact design while maintaining operational stability.
3Reliability
If the light source is enclosed in a protective housing, then the light source is protected, but heat dissipation from the light ray emitting zone becomes difficult
Solution Approach 1:
The protective housing is designed with segmented or openings that allow thermal pathways while maintaining protective enclosure. The mask is positioned and configured to block light reflections while permitting heat to escape from the light ray emitting zone. This segmentation approach divides the protective housing into functional zones: one providing protection and another enabling thermal management, thereby resolving the contradiction between protection and heat dissipation.
4Ease of operation
If the optical system is exposed to the environment, then solar rays can enter the system, but this exposes components to destructive solar radiation
Solution Approach 1:
The mask acts as an intermediary barrier that selectively filters solar radiation before it reaches the optical components. It blocks harmful ultraviolet and infrared rays while allowing visible light necessary for optical operation to pass through. This intermediary filtering layer protects components from solar damage while maintaining the optical system's accessibility and functionality.
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 device effectively filters light reflections, dissipates heat, and protects against electromagnetic interference and solar rays, ensuring reliable operation and image quality.
Implementation Method 1
the sharpness of the images projected by the light source may be adversely affected by phenomena of reflection of the rays coming from the light ray emitting zone on elements situated in the optical system and close to the light ray emitting zone
Implementation Method 2
the light source produces heat that it is necessary to evacuate in order not to the damage the electronic components situated in the light source or near the light source
Implementation Method 3
the operation of the light source may be disturbed by external electromagnetic fields generated by electronic components situated near the light source
Data Source
AI summary
A luminous device including an optical device and a first printed circuit board on which is fastened a light source including a light ray emitting zone and a protective housing surrounding the light ray emitting zone. A first height of the protective housing, relative to a flat surface of the first printed circuit board, being greater than a second height of the light ray emitting zone. The luminous device also includes a mask arranged between the optical device and the light ray emitting zone so as to prevent rays coming from the light ray emitting zone from being reflected on the protective housing and reaching the optical device, the mask bearing directly against the first printed circuit board and/or directly against the light source.