Vehicle Camera Housing Ground Loop for EMI Shielding
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Solution Overview
Problem
Existing vehicle imaging devices suffer from electromagnetic interference due to the presence of electric and magnetic fields generated by the printed circuit boards and conductive loops, leading to undesirable electromagnetic effects.
Innovation Solution
A vehicle imaging device with a closed electrical loop formed by the printed circuit board, a pin with a ground connection, an electrically conductive element, and the housing, where the conductive element is in electrical contact with the housing, forming a Faraday shield to minimize electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If a printed circuit board with conductor loops is used in the imaging device, then data transmission and power supply are enabled, but electromagnetic fields are generated causing interference
Solution Approach 1:
The patent converts the harmful electromagnetic fields generated by the PCB into beneficial effects by creating a Faraday shield using the housing and conductive elements. The shield captures and redirects the electromagnetic energy, transforming the interference problem into a protective mechanism that actually reduces overall electromagnetic emissions while maintaining necessary electrical connections for data and power transmission
2Ease of manufacture
If traditional PCB grounding is used without a closed loop, then manufacturing is simpler, but electromagnetic interference is not reduced
Solution Approach 1:
The patent merges the housing structure with the grounding system by making the housing itself an integral part of the Faraday shield. The conductive elements are integrated into the housing and PCB assembly, creating a unified closed-loop grounding system that provides electromagnetic shielding while maintaining manufacturing simplicity through combined structural and electrical functions
3Object-affected harmful factors
If a closed electrical loop with Faraday shield is implemented, then electromagnetic interference is reduced, but device complexity increases
Solution Approach 1:
The patent achieves multi-functionality by making the housing serve dual purposes: as the structural enclosure and as the Faraday shield. The conductive elements simultaneously provide electrical grounding and electromagnetic shielding. This universal approach reduces overall device complexity by eliminating separate shielding components while maintaining effective electromagnetic interference reduction
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 reduces electromagnetic interference by creating a closed loop that acts as a Faraday shield, improving electromagnetic compatibility and ease of manufacturing and installation.
Implementation Method 1
an electrically conductive element located in electrical connection with the pin comprising a ground connection, the electrically conductive element being in electrical contact with the housing such that a closed electrical loop is formed among the printed circuit board, the pin comprising a ground connection, the electrically conductive element, the housing and the printed circuit board
Data Source
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AI summary
Vehicle imaging device, comprising: • an image sensor (15), • a lens (1), • a printed circuit board (3), • a pin (21.1) comprising a ground connection and in electrical connection with the printed circuit board (3), • a housing (7, 8) comprising an inner cavity (12) enclosing at least the printed circuit board (3), the image sensor (15) and a portion of the pin (21.1) comprising a ground connection, • an electrically conductive element (30) located in electrical connection with the pin (21.1) comprising a ground connection, the electrically conductive element (30) being in electrical contact with the housing (7, 8) such that a closed electrical loop is formed among the printed circuit board (3), the pin (21.1) comprising a ground connection, the electrically conductive element (30), the housing (7, 8) and the printed circuit board (3).