PCB Grounding Boss Structure for Improved Noise Transmission
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Solution Overview
Problem
Existing electronic devices face challenges in effectively transmitting noise between the ground pattern of the circuit board and the housing due to small contact areas between the contact surfaces of the bosses and the ground pattern, leading to inadequate noise transmission.
Innovation Solution
The electronic device incorporates a housing with columnar bosses that have a recessed contact surface and a protruding surface on the circuit board, allowing for increased contact area between the ground pattern and the housing, enhancing noise transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact area between the boss and the ground pattern is increased to improve noise transmission, then the noise transmission efficiency is improved, but the width of the boss must be increased which increases device size
Solution Approach 1:
The patent transitions from a two-dimensional contact surface to a three-dimensional contact structure by forming a recessed surface that extends in the depth direction. This allows the contact area to be increased without increasing the boss width, as the additional contact area is achieved through vertical dimension rather than horizontal expansion.
Solution Approach 2:
The recessed surface is formed within the existing boss structure, creating a nested configuration where the contact surface is indented into the boss body. This nesting approach increases the contact area with the ground pattern while maintaining the outer dimensions of the boss, effectively solving the space constraint.
2Reliability
If the contact area between the boss and the ground pattern is increased to improve noise transmission, then the noise transmission efficiency is improved, but the structural complexity of the boss increases
Solution Approach 1:
The contact surface is segmented into multiple levels through the recessed structure, creating distinct contact zones at different depths. This segmentation allows for optimized noise transmission across multiple interfaces while maintaining a relatively simple overall boss structure that can be manufactured using standard processes.
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 increases the contact area between the ground pattern and the housing, effectively transmitting noise and improving noise transmission efficiency without increasing the width of the bosses, thereby enhancing the device's noise management capabilities.
Implementation Method 1
The contact surface has a recessed surface that is recessed toward the fastening hole from an outer peripheral surface of the boss. The circuit board has a protruding surface that protrudes such that the ground pattern is in contact with the recessed surface.
Data Source
AI summary
An electronic device includes a housing made of metal, a circuit board on which a circuit pattern is formed, and an electronic component mounted on the circuit board. The housing has a boss that is formed in a columnar shape protruding toward the circuit board and to which the circuit board is fixed by a fastening member made of metal. The boss has a fastening hole into which the fastening member is screwed and a contact surface with which a ground pattern in the circuit pattern is in contact. The contact surface has a recessed surface that is recessed toward the fastening hole. The circuit board has a protruding surface that protrudes such that the ground pattern is in contact with the recessed surface.