Vehicular Camera Shield Layout for EMI and Ground Stability
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Solution Overview
Problem
Existing vehicular cameras face challenges in reducing noise interference and stabilizing ground potential due to electromagnetic interference, which affects their performance and reliability.
Innovation Solution
A vehicular camera design featuring a metal shield with a recessed portion and specific component placement on the circuit board, along with a resin member for heat dissipation, to minimize electromagnetic interference and stabilize ground potential.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the distance between the shield and circuit board is reduced to improve noise resistance, then electromagnetic interference is reduced, but components on the circuit board may contact the shield
Solution Approach 1:
The shield surface is divided into different regions with different heights (first bottom surface portion and second bottom surface portion in recessed portion). This local variation in height allows different areas of the shield to serve different functions: the lower first bottom surface portion provides strong electromagnetic shielding close to the circuit board, while the recessed second bottom surface portion prevents contact with taller components, thus resolving the contradiction between noise resistance and component contact prevention.
2Stability of the object's composition
If the shield is placed close to the circuit board ground to stabilize ground potential, then ground stability is improved, but resonance may occur between the shield and ground
Solution Approach 1:
The shield employs a non-uniform height structure with first and second bottom surface portions at different heights. This local quality variation allows the shield to maintain close proximity to the circuit board ground for stabilizing ground potential in certain areas, while the recessed portions create sufficient spacing in other areas to prevent resonance, thus resolving the contradiction between ground stability and resonance prevention.
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 design reduces electromagnetic interference, enhances noise resistance, and stabilizes the ground potential, improving the camera's performance and reliability.
Implementation Method 1
noise resistance can be improved since radio waves are less likely to fly in
Implementation Method 2
a resin housing to which the lens barrel portion is fixed, the housing accommodating at least the circuit board
Data Source
AI summary
A vehicular camera includes a circuit board accommodated in a housing and a metal shield. The circuit board includes a first component disposed on a second surface and having a first height and a second component disposed on the second surface and having a second height smaller than the first height. The first component is disposed in a position opposite to a second bottom surface portion of a recessed portion of a first bottom surface portion of the shield, and the second component is disposed in a position opposite to a portion other than the recessed portion of the first bottom surface portion of the shield.