Metallized Reflector Housing for Automotive LED EMI Shielding
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Solution Overview
Problem
Conventional metal cages used to mitigate electromagnetic disturbances in LED lighting modules for motor vehicles are expensive and inflexible, limiting design and layout options.
Innovation Solution
A reflector device with metallized internal faces and a metallized contact zone on its external face, which can be easily integrated into various lighting module configurations, functions as both a reflector and a shielding element by connecting to ground, thereby reducing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If a conventional metal cage (Faraday cage) is used to shield electromagnetic disturbances, then electromagnetic interference is reduced, but cost increases and design flexibility is limited
Solution Approach 1:
The patent merges the reflector and electromagnetic shielding functions into a single integrated component. The reflector housing includes internal metallized surfaces for light reflection and external metallized contact zones for electromagnetic shielding, eliminating the need for separate metal cage structures and providing design flexibility.
Solution Approach 2:
The reflector device performs multiple functions simultaneously: it reflects light from LED sources, provides electromagnetic shielding through its metallized contact zones, and serves as a structural housing. This multi-functionality replaces the need for separate shielding components, enhancing design adaptability.
2Object-affected harmful factors
If a conventional metal cage is used for electromagnetic shielding, then electromagnetic disturbances are contained, but manufacturing cost increases
Solution Approach 1:
By combining the reflector and shielding functions into one component, the patent reduces the total number of parts and assembly steps. The metallized contact zones are integrated directly into the reflector housing structure, simplifying manufacturing compared to separate metal cage assemblies.
Solution Approach 2:
The patent uses cost-effective metallized coatings on plastic housing surfaces rather than expensive solid metal cages. The metallized contact zones provide sufficient shielding at lower cost, making the solution more economically viable for automotive lighting applications.
3Object-affected harmful factors
If a metal cage is used to cover the printed circuit board, then electromagnetic waves are blocked, but the design layout of electronic components is constrained
Solution Approach 1:
The shielding function is merged into the reflector housing structure itself, with metallized contact zones positioned on the external face. This eliminates the need for a separate metal cage covering the printed circuit board, allowing greater freedom in component layout and assembly.
Solution Approach 2:
The shielding is provided through discrete metallized contact zones rather than a continuous metal cage. These segmented contact zones can be strategically positioned to shield electromagnetic disturbances from the printed circuit board without constraining the overall component layout or assembly process.
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 solution effectively shields against electromagnetic waves emitted by LED lighting modules, offering a cost-effective and adaptable solution that enhances the design flexibility of motor vehicle lighting systems while maintaining efficient light reflection and direction.
Implementation Method 1
at least part of the internal faces of which is metallized so as to reflect the light received
Implementation Method 2
at least part of the reception means on the external face of the housing is metallized so as to define a contact zone that allows the metallized part to make electrical contact
Data Source
AI summary
The subject of the invention is a reflector device for a lighting module of a motor vehicle. The device includes a housing made of plastic, wherein the internal faces are metallized so as to reflect the light received. The housing on an external face of one of its walls has reception means able to house a support including at least one light source, the wall having an opening which leads toward the inside of the housing and which allows the light emitted by the light source or sources to propagate toward the inside of the housing. According to the provisions of the invention, the external face of the housing may be connected to ground potential so as to act as a shield against the electromagnetic waves emitted by various electronic components.