ICC Socket Spring Contacts for POS Electrostatic Discharge Protection
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Solution Overview
Problem
Point-of-sale (POS) devices are prone to electrostatic discharge (ESD) damage, particularly from metal payment cards, which can lead to permanent device failure due to inadequate electrostatic discharge pathways.
Innovation Solution
The integration of spring members or contact elements made of conductive materials, such as metal, within the ICC socket of POS devices, which form low impedance electrical paths between the payment card edges and the electrical ground, ensuring continuous electrostatic discharge protection even when the card is fully inserted.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a conventional ICC socket without spring members is used, then the device structure is simpler, but the electrostatic discharge protection is inadequate and the device is prone to ESD damage
Solution Approach 1:
The spring members are integrated within the ICC socket structure, with the contact elements nested inside the socket housing. This nested arrangement provides ESD protection functionality without significantly increasing the external dimensions or visual complexity of the socket assembly.
Solution Approach 2:
The spring members act as intermediary elements between the payment card edges and the electrical ground. These spring contact elements provide a dedicated ESD pathway that mediates the discharge process, protecting the POS device while maintaining structural integration within the socket.
2Reliability
If spring members are integrated into the ICC socket, then continuous electrostatic discharge protection is achieved, but the manufacturing process becomes more complex
Solution Approach 1:
The spring members and contact elements are combined into a single integrated ESD protection mechanism within the ICC socket. This merging of components reduces the number of separate parts that need to be manufactured and assembled, simplifying the overall manufacturing process while maintaining continuous ESD protection.
Solution Approach 2:
The spring members serve multiple functions: they provide continuous electrical contact for ESD protection, maintain mechanical pressure on the card edges, and integrate within the existing socket structure. This multi-functionality reduces the need for additional specialized components, easing manufacturing requirements.
3Reliability
If the spring member exerts increasing force against the card edge during insertion, then the impedance of the ESD path is lowered, but the mechanical stress on the spring member increases
Solution Approach 1:
The spring member is designed to dynamically adjust its contact force with the card edge during insertion. As the card is inserted, the spring progressively exerts increasing force to maintain optimal electrical contact and lower impedance, while the elastic properties of the spring naturally manage the stress through controlled deformation.
Solution Approach 2:
The spring member's physical parameters (contact force, compression distance) change dynamically during the card insertion process. This parameter adjustment allows the system to optimize ESD path conductivity at different insertion stages while distributing mechanical stress over the spring's elastic range, preventing excessive stress concentration.
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 provides continuous electrostatic discharge protection by maintaining a low impedance path between the payment card and ground, preventing device damage and ensuring reliable operation.
Implementation Method 1
a spring member comprising a first end electrically coupled to a second end. The first end is electrically coupled to an electrical ground... the second end is positioned for contact with a top edge of the payment card... form a first electrical path for electrostatic discharge between the payment card and the electrical ground
Implementation Method 2
as the payment card is inserted, a spring action causes the second end to exert an increasing force against the edge of the payment card
Data Source
AI summary
A system for prevention of electrostatic discharge from a payment card to a point of sale (POS) device comprising an integrated circuit card (ICC) socket, includes a spring member comprising a first end electrically coupled to a second end. The first end is electrically coupled to an electrical ground, the first end is mechanically coupled to the POS device, and the second end is positioned for contact with a top edge of the payment card. When the payment card is inserted into the ICC socket and the top edge comes into contact with the second end, the first end and the second end form a first electrical path for electrostatic discharge between the payment card and the electrical ground.