Shield Contact Portion Design for Electromagnetic Interference
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Solution Overview
Problem
Conventional electronic devices with plate-spring-like connecting portions on shields for electromagnetic tolerance suffer from reduced shield effectiveness due to slits that allow communication between the inside and outside of the shield, compromising the blocking of electromagnetic waves.
Innovation Solution
The design includes a first shield with a contact portion on one surface of the circuit board and an elastically deformable connecting portion that extends in the thickness direction, with a second shield on the opposing surface, eliminating slits in the connecting portions to enhance electromagnetic wave shielding.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If plate-spring-like connecting portions with slits are used to connect shields, then connection stability between shields is improved, but shield effect against electromagnetic waves is reduced due to communication through slits
Solution Approach 1:
The connecting portion is divided into multiple segments (first connecting portion and second connecting portion) that are spatially separated. The first connecting portion extends in the thickness direction for electrical connection, while the second connecting portion extends in the lateral direction for mechanical support, preventing the formation of continuous slits that would compromise shielding effectiveness.
Solution Approach 2:
The connection structure transitions from a two-dimensional planar connection to a three-dimensional structure by extending the first connecting portion in the thickness direction (vertical dimension) and the second connecting portion in the lateral direction (horizontal dimension), allowing stable connection without requiring slits in a single plane.
2Object-affected harmful factors
If shields cover both front and back surfaces of the circuit board, then electromagnetic tolerance is improved, but device complexity increases
Solution Approach 1:
The first and second connecting portions are integrated into a single unified connecting structure that performs both vertical connection (first connecting portion) and lateral positioning (second connecting portion), simplifying the overall shield assembly while maintaining electromagnetic tolerance on both surfaces of the circuit board.
Solution Approach 2:
The connecting structure serves multiple functions simultaneously: the first connecting portion provides electrical connection between shields, the second connecting portion provides mechanical support and positioning, and together they enable stable dual-surface shielding without requiring separate components for each function.
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 configuration improves the shield effect against electromagnetic waves by maintaining contact stability and reducing the risk of external interference, while allowing for a more compact and robust electronic device structure.
Implementation Method 1
a connecting portion extending from the contact portion of the first shield and being elastically deformable so that its end portion moves in a thickness direction of the circuit board
Data Source
AI summary
An electronic device includes an upper shield arranged on a front side of a circuit board, and a lower shield arranged on a back side thereof. The lower shield includes a contact portion at an edge thereof. The contact portion is in contact with a lower surface of the circuit board. A plate spring portion is formed in the contact portion. An end portion of the plate spring portion abuts on the upper shield.