Laser-Welded Metal Sensor Housing for EMI Shielding
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Solution Overview
Problem
Current methods for producing sensors lack efficiency and reliability, particularly in terms of secure connections and stability, and often rely on adhesives or polymer materials that can cause reliability issues and inadequate shielding against electromagnetic interference.
Innovation Solution
A method involving a metallic housing and cover with an integral connection using laser welding, where the cover is welded to the housing over specified welding regions, providing a robust and stable sensor with improved thermal properties and shielding, and allowing for efficient production and customization.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If adhesive or polymer materials are used to connect the cover to the housing, then the production process is simpler, but the connection reliability and stability deteriorate
Solution Approach 1:
The patent replaces adhesive bonding (chemical/mechanical system) with laser welding (thermal system). The laser welding process creates a metallurgical bond between the cover and housing, providing superior connection reliability while maintaining production efficiency through automated processing.
Solution Approach 2:
The patent changes the connection method from low-strength adhesive bonding to high-strength laser welding by altering the joining parameters (temperature, energy input, process time). This parameter change transforms the connection reliability from inadequate to excellent while keeping the production process streamlined.
2Ease of manufacture
If adhesive or polymer materials are used for the cover, then the manufacturing process is simpler, but the shielding against electromagnetic interference deteriorates
Solution Approach 1:
The patent employs a metallic cover material that inherently provides electromagnetic shielding properties. The metal cover acts as a Faraday cage, blocking electromagnetic interference from reaching the sensor module, while the material can still be efficiently processed using standard manufacturing techniques.
3Ease of manufacture
If a non-metallic cover is used, then the production process is simpler, but the stability and robustness deteriorate
Solution Approach 1:
The patent changes the material parameter from polymer to metal, which fundamentally alters the mechanical properties including stability, robustness, and thermal characteristics. The metallic cover provides enhanced structural stability while remaining compatible with efficient laser welding processes.
4Ease of manufacture
If polymer materials are used for the cover, then the production process is simpler, but thermal properties and heat transfer control deteriorate
Solution Approach 1:
The patent uses metallic materials for the cover that provide superior thermal management properties. The metal cover can be designed with specific thermal conductivity characteristics to control heat transfer to the sensor module, and the material is fully compatible with laser welding processes for secure attachment.
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
This approach results in a robust, stable, and efficiently produced sensor with enhanced reliability, simplified alignment, and improved shielding against electromagnetic interference, while minimizing the use of adhesives and reducing heat transfer to the sensor module.
Implementation Method 1
the integral connection comprises laser welding by means of a welding laser
Implementation Method 2
A wavelength of the laser light emitted by means of the welding laser is, for example, in the infrared range
Data Source
AI summary
A method for producing a sensor. The method includes: arranging a sensor module in a metallic housing, wherein the housing comprises a housing opening; fixing a metallic cover to or in the housing opening in order to close the housing opening by means of the cover; wherein the fixing comprises an integral connecting of the cover to the housing. A sensor is also described.