Metal Housing Projections for PCB EMI Shielding Contact
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Solution Overview
Problem
Existing methods for shielding electromagnetic wave noise in electronic devices using metal-to-metal contact between a circuit board and housing increase manufacturing costs and reduce arrangement efficiency due to the need for numerous leaf springs or screws, leading to increased dead space.
Innovation Solution
A housing with internal walls that provide metal-to-metal contact with the circuit board, utilizing projections to enhance contact and minimize the use of leaf springs and screws, thereby reducing dead space and maintaining effective electromagnetic wave noise shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Object-affected harmful factors
If leaf springs or screws are arranged one by one at the target position to obtain metal-to-metal contact between the circuit board and housing, then electromagnetic wave noise shielding is improved, but the amount of leaf springs or screws used increases so that manufacturing cost increases
Solution Approach 1:
The patent combines the shielding function and fixing function into a single integrated structure. The housing itself is designed with protrusions that directly contact the circuit board, eliminating the need for separate shielding materials and fasteners. This merging of functions reduces the number of components and manufacturing steps while maintaining effective electromagnetic shielding.
Solution Approach 2:
The housing structure serves multiple purposes simultaneously: it provides mechanical support, fixes the circuit board in position, and shields electromagnetic wave noise. The protrusions on the housing internal wall perform both the shielding function and the positioning function, making the housing a multi-functional component that replaces several separate parts.
2Object-affected harmful factors
If leaf springs or screws are arranged one by one at the target position to obtain metal-to-metal contact between the circuit board and housing, then electromagnetic wave noise shielding is improved, but the configuration requires a wide area for arranging these materials, which results in increased dead space on the circuit board
Solution Approach 1:
The patent extracts the shielding function from separate components and integrates it directly into the housing structure. By forming the shielding function within the housing's internal wall protrusions, the design eliminates the need for additional shielding materials that would occupy space on the circuit board, thereby reducing dead space.
Solution Approach 2:
The patent utilizes the vertical dimension by designing protrusions on the housing internal wall that extend toward the circuit board. This three-dimensional approach allows shielding contact to be achieved through the thickness of the housing rather than requiring lateral arrangement of multiple fasteners on the circuit board surface, thus minimizing dead space.
3Object-affected harmful factors
If the dead space on the circuit board increases due to arrangement of leaf springs or screws, then electromagnetic wave noise shielding is maintained, but the arrangement efficiency of electronic components on the circuit board deteriorates
Solution Approach 1:
The patent merges the shielding function with the housing structure itself, eliminating the need for separate shielding components that would occupy valuable circuit board space. This integration ensures that electronic components can be arranged more efficiently without being displaced by additional shielding materials or fasteners.
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 shields electromagnetic noise while minimizing manufacturing costs and maintaining efficient component arrangement by ensuring robust metal-to-metal contact without excessive use of fasteners, thus preventing electromagnetic interference.
Implementation Method 1
shield an electromagnetic wave noise using metal-to-metal contact between a circuit board and a housing
Data Source
AI summary
An electronic apparatus includes: a circuit board on which an electronic component is mounted; and a housing made of metal inside which the circuit board is disposed. The housing has an internal wall on which the circuit board is mounted and surrounding the electronic component, and at least one projection being provided on a surface of the internal wall that faces the circuit board and being in metal-to-metal contact with the circuit board.