Vehicle Tail Light Reflector Charge Dissipation Path
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Solution Overview
Problem
Vehicle lighting devices are prone to electrostatic discharge during installation, which can lead to the destruction of electrical components due to high current pulses flowing through printed circuit boards, particularly when metallic components become charged.
Innovation Solution
A charge dissipation path is integrated to direct electrostatic discharge to a ground connection, ensuring that electrical components like transistors and diodes are protected by bypassing conductive surfaces and maintaining their functionality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Illumination intensity
If the lighting device is equipped with metallic components (reflector with metallic coating) for optical functions, then the light guidance and reflection performance is improved, but electrostatic discharge occurs during installation which can destroy electrical components on the printed circuit board
Solution Approach 1:
The patent introduces a charge dissipation path as an intermediary element between the electrostatically charged reflector and the electrical components on the printed circuit board. This path provides a controlled route for electrostatic discharge, preventing direct current pulses from damaging sensitive electronics while maintaining the reflector's optical functionality
Solution Approach 2:
The patent converts the harmful electrostatic charge accumulation on the reflector into a beneficial controlled discharge mechanism. By providing a dedicated charge dissipation path, the harmful ESD energy is redirected through a safe route that protects electrical components while still allowing the reflector to fulfill its optical purpose
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 prevents damage to electrical components by safely dissipating electrostatic charges, ensuring the lighting device functions correctly and improving electromagnetic compatibility.
Implementation Method 1
electrostatic discharge (ESD) can occur via a printed circuit board due to the charged lighting device, with relatively high current pulses flowing along the printed circuit board
Implementation Method 2
a charge dissipation path is provided as the charge dissipation means, which is in direct contact with the reflector at a first end and directly with a ground connection of the carrier or a central plug device of the lighting device at a second end
Data Source
Figure 1~3
Figure 4
AI summary
The invention relates to an illuminating device for vehicles, in particular a tail light, with a housing containing at least one light source, a support accommodating the light source, and a reflector, and with a diffusion lens for covering an opening of the housing, characterized in that the reflector, which is provided with an electrically conductive coating, is assigned charge dissipation means in such a manner that, when electrostatic charging of the reflector occurs, a dissipation current flows to a connection to earth of the illuminating device.