Camera Unit Shielding for On-Vehicle EMC
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
In camera units, especially on-vehicle cameras, improving Electromagnetic Compatibility (EMC) performance is challenging due to the lengthening of the radiation noise return path when using adhesives instead of screws for fixing the lens unit to the sensor substrate, which complicates positional adjustments and conduction between components.
Innovation Solution
A camera unit design featuring a shield on the sensor substrate with a conductive contact portion to facilitate shorter return paths for radiation noise, using a combination of shields and conductive contact points to connect the lens unit and sensor substrate effectively, thereby enhancing EMC performance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If screws are used to fix the lens unit to the sensor substrate, then conduction between components is achieved in short distance, but positional adjustment becomes difficult due to fixed screw holes
Solution Approach 1:
The fixing mechanism is segmented into two independent functions: positioning (achieved through adhesive bonding that allows adjustment) and conduction (achieved through separate conductive elements such as conductive adhesive, metal sheets, or spring contacts). This segmentation allows the lens unit to be positioned and adjusted freely while maintaining reliable electrical connection for EMC performance.
Solution Approach 2:
A conductive intermediary element is introduced between the lens unit and sensor substrate. This intermediary can be a conductive adhesive layer, a metal sheet, or spring contacts that provide both mechanical support and electrical conduction. The intermediary decouples the positioning function from the conduction function, allowing independent optimization of both.
2Adaptability or versatility
If adhesive is used to fix the lens unit to the sensor substrate, then positional adjustment becomes easy, but conduction between components is achieved in longer distance
Solution Approach 1:
The fixing mechanism is segmented into two independent functions: positioning (achieved through adhesive bonding that allows adjustment) and conduction (achieved through separate conductive elements such as conductive adhesive, metal sheets, or spring contacts). This segmentation allows the lens unit to be positioned and adjusted freely while maintaining reliable electrical connection for EMC performance.
Solution Approach 2:
A conductive intermediary element is introduced between the lens unit and sensor substrate. This intermediary can be a conductive adhesive layer, a metal sheet, or spring contacts that provide both mechanical support and electrical conduction. The intermediary decouples the positioning function from the conduction function, allowing independent optimization of both.
3Reliability
If screw holes are opened in the lens unit and sensor substrate, then conduction is achieved, but manufacturing complexity increases
Solution Approach 1:
The mechanical screw fixation system is replaced with a combination of adhesive bonding (for mechanical support and positioning) and conductive elements (for electrical conduction). This substitution eliminates the need for precision drilling and threading of screw holes, significantly simplifying the manufacturing process while maintaining both structural integrity and electrical connection.
Solution Approach 2:
The conduction path is changed from a mechanical contact through screw holes to an electrical contact through conductive materials applied to surfaces. This parameter change from mechanical to electrical conduction allows for simpler manufacturing processes such as screen printing, spraying, or placing conductive elements without requiring precise hole 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 effectively shortens the radiation noise return path, improving EMC performance by ensuring efficient conduction and allowing for easier positional adjustments between the lens unit and sensor substrate, thus enhancing the camera unit's electromagnetic compatibility.
Implementation Method 1
a contact portion that has conductivity and is provided on the sensor substrate so as to have contact with a portion on a side of a side surface of the sensor substrate of the shield
Data Source
AI summary
The present technology relates to a camera unit and a mobile body capable of improving Electromagnetic Compatibility (EMC) performance. The camera unit includes a shield arranged at least on a side of one side surface of a sensor substrate to which an image sensor is attached and a contact portion that has conductivity and is provided on the sensor substrate so as to have contact with a portion on a side of a side surface of the sensor substrate of the shield. The present technology is applied to, for example, a camera unit or the like mounted on a mobile body such as a vehicle.