Memory Card ESD Protection Path Design
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Solution Overview
Problem
Conventional memory cards face insufficient electrostatic discharge (ESD) protection as their casings fail to adequately shield internal devices from ESD damage, especially as devices become smaller, and existing solutions do not effectively prevent ESD currents from entering signal paths.
Innovation Solution
A memory card design featuring an ESD protection path with a metal layer or ring-shaped area that extends to the edge of the circuit board, ensuring electrostatic charges are collected and transmitted out, while signal paths remain non-exposed at the edge to prevent damage, using a manufacturing method that includes defining cutting lines and removing plating lines to facilitate plating operations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the memory card is reduced in size according to current trends, then the portability and compactness are improved, but the ESD protective capacity provided by the casing becomes insufficient
Solution Approach 1:
The circuit board is segmented into functional zones with signal paths confined to internal areas and ESD protection paths extended to edges, creating distinct functional segments that address both compactness and ESD protection needs
Solution Approach 2:
An ESD protection path acts as an intermediary between external ESD threats and internal signal paths, providing a dedicated route for ESD current that prevents direct interaction with sensitive signal lines
2Ease of manufacture
If plating lines are extended outside cutting lines to facilitate plating operation, then the manufacturing processability is improved, but the signal paths become exposed at the edge and vulnerable to ESD damage
Solution Approach 1:
Different regions of the circuit board are assigned different functions: signal paths are confined to protected internal regions while ESD protection paths are specifically extended to edge regions, creating local quality differences that address both manufacturing and protection needs
Solution Approach 2:
The ESD protection path is extracted and separated from signal paths, allowing it to be independently extended to board edges while signal paths remain confined to protected areas, thus eliminating ESD vulnerability without compromising manufacturing
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 ESD protection path effectively transmits ESD currents away from internal devices, preventing damage and enhancing the memory card's ESD protective capacity by ensuring signal paths are not exposed at the edge of the circuit board.
Implementation Method 1
The ESD protection path for transmitting ESD current is disposed on the circuit board
Implementation Method 2
a metal layer 210 or a ring-shaped area 220, which is a part of the ESD protection path 230
Data Source
AI summary
A memory card with electrostatic discharge (ESD) protection and a manufacturing method thereof are provided. The memory card includes a circuit board, a set of contacts, at least one chip and an ESD protection path. The signal paths of the board is not exposed at the edge of the circuit board. The ESD protection path for transmitting ESD current is disposed on the circuit board. Furthermore, a part of the ESD protection path extends to the edge of the circuit board.