Vehicle Camera Housing Grounding for EMC Tolerance Compensation
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing vehicle cameras struggle to achieve reliable electromagnetic compatibility (EMC) due to undesired electromagnetic radiation from components like imaging chips and power supplies.
Innovation Solution
A camera design for motor vehicles that includes a housing configured to shield electromagnetic radiation, a circuit board, and an interface device with a coaxial plug and a connecting device that electrically connects the outer conductor of the coaxial plug to the housing, ensuring effective grounding and shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the housing is used to shield electromagnetic radiation, then electromagnetic compatibility is improved, but reliable electrical connection and compensation for manufacturing inaccuracies becomes difficult
Solution Approach 1:
An electrically conductive connecting device is introduced as an intermediary element between the housing and the outer conductor. This connecting device serves dual purposes: it provides reliable electrical connection for electromagnetic shielding while simultaneously compensating for manufacturing inaccuracies through its elastic deformability, thus resolving the contradiction between shielding effectiveness and manufacturing tolerance compensation.
Solution Approach 2:
The connecting device is designed with elastic deformability, allowing it to change its physical parameters (shape, position) to compensate for manufacturing variations. This parameter change capability enables the system to maintain both effective electromagnetic shielding and accommodation of manufacturing inaccuracies without requiring perfect precision.
2Object-generated harmful factors
If the housing is electrically connected to the outer conductor, then electromagnetic radiation shielding is improved, but manufacturing inaccuracies affect the connection reliability
Solution Approach 1:
The connecting device is made from elastic, electrically conductive material that can deform to accommodate manufacturing variations. This flexible yet conductive property allows the housing to be reliably connected to the outer conductor for effective electromagnetic shielding, while the elasticity compensates for dimensional tolerances in manufacturing.
3Object-affected harmful factors
If a coaxial plug is used for interface device, then electromagnetic interference is reduced, but concentric alignment with housing opening is difficult to achieve
Solution Approach 1:
The elastic connecting device acts as a mediator between the coaxial plug and the housing opening. It allows the coaxial plug to be electrically connected to the housing while compensating for non-concentric alignment through its deformability, thus maintaining low electromagnetic interference without requiring perfect concentric alignment.
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 enhances electromagnetic compatibility by effectively shielding electromagnetic radiation, compensating for manufacturing inaccuracies, and ensuring reliable electrical connections, thereby improving the camera's ability to operate without interfering with other technical appliances.
Implementation Method 1
a housing (5) configured to shield electromagnetic radiation at least in certain areas
Implementation Method 2
the camera has a connecting device (17) for electrically connecting the outer conductor (14) to the housing (5)
Implementation Method 3
the interface device (11) includes a coaxial plug (12) with an inner conductor (13) and an outer conductor (14)
Data Source
AI summary
The invention relates to a camera (2) for a motor vehicle (1), including a housing (5) configured to shield electromagnetic radiation at least in certain areas, including a circuit board (16) disposed in the housing (5), and including an interface device (11) for connecting the camera (2) to the motor vehicle (1), wherein the interface device (11) is electrically connected to the circuit board (16), wherein the interface device (11) includes a coaxial plug (12) with an inner conductor (13) and an outer conductor (14) and the camera (2) has a connecting device (17) for electrically connecting the outer conductor (14) with the housing (5), wherein the connecting device (17) comprises at least one separate and electrically conductive rubber piece (18), which is arranged between the outer conductor (14) and the housing (5) and contacts the outer conductor (14) and the housing (5).