SIM Card Connector Pressing Tabs for Signal Stability
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Solution Overview
Problem
Conventional SIM card connectors require high manufacturing costs due to the need for resilient terminals for stable signal transmission, which degrade over time, leading to signal transmission failures.
Innovation Solution
An electrical connector design featuring an insulative housing with a base and extension, terminals with resilient contacting portions, and a metal shell with pressing tabs that securely hold the SIM card in place, preventing movement and signal loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If resilient terminals are used to ensure stable signal transmission, then signal transmission reliability is improved, but manufacturing cost increases
Solution Approach 1:
The pressing structure is divided into multiple pressing tabs distributed across the metal shell, each independently pressing against the SIM card. This segmentation allows the use of simpler, less expensive terminal structures while maintaining stable contact through distributed pressing forces.
Solution Approach 2:
The pressing force is applied from a different dimension - the pressing tabs extend from the metal shell's outer surface inward toward the SIM card, creating a top-down pressing mechanism rather than relying solely on resilient terminals from the sides. This dimensional change enables stable contact with simpler terminal structures.
2Reliability
If resilient terminals are used to maintain stable signal transmission, then signal transmission stability is improved, but the terminals degrade over time leading to signal failure
Solution Approach 1:
The pressing tabs provide a pre-applied pressing force that cushions and distributes the contact pressure between the SIM card and terminals. This beforehand cushioning prevents excessive localized stress on the terminals, reducing fatigue and extending their service life while maintaining stable signal transmission.
Solution Approach 2:
The metal shell with integrated pressing tabs acts as a flexible pressing structure that can adapt to the SIM card's position while providing consistent contact force. This flexible pressing mechanism distributes stress more evenly compared to rigid resilient terminals, reducing wear and extending operational life.
3Reliability
If the SIM card tightly abuts the terminals, then electrical connection is achieved, but the terminals lose resilience over time causing signal transmission failure
Solution Approach 1:
The pressing tabs are pre-configured to apply pressing force as soon as the SIM card is inserted, establishing and maintaining proper contact pressure before any wear or resilience loss occurs. This preliminary action ensures stable electrical connection from the start and maintains it throughout the terminal's service life.
Solution Approach 2:
The pressing tabs provide continuous cushioning force that compensates for gradual terminal deformation or resilience loss over time. This beforehand cushioning ensures that even as terminals age, the SIM card remains firmly pressed against the contact points, maintaining reliable electrical connection.
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 connector ensures stable signal transmission by securely holding the SIM card with reduced manufacturing costs and minimizing signal failures due to the combination of resilient terminals and pressing tabs.
Implementation Method 1
The top plate has a plurality of pressing tabs formed on and protruding from the top plate towards the top of the insulative housing to tightly abut against a card that is inserted into the card space
Implementation Method 2
the terminals abut resiliently against and electrically connect to the SIM card
Data Source
AI summary
An electrical connector has an insulative housing, a plurality of terminals and a metal shell. The insulative housing has a base and an extension. The terminals are mounted in the base. The metal shell covers the insulative housing to define a card space between the insulative housing and the metal shell and has a top plate and two lateral plates. The top plate has a plurality of pressing tabs formed on and protruding from the top plate towards the top of the insulative housing to tightly abut against a card that is inserted into the card space. The pressing tabs prevent the card from moving or falling out of the card space.