SIM Card Connector Movable Starting Point Design
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Solution Overview
Problem
Existing card connectors face challenges in miniaturization and achieving sufficient contact pressure, especially when the contact point is close to the card insertion opening, as seen in connectors for micro SIM or nano SIM cards.
Innovation Solution
A connector design featuring a holding member with a rear and front support portion, where the contact has a base portion and a spring portion with a movable starting point that allows for up-down movement, enabling the contact point to maintain pressure even with a short spring, thus reducing the overall height and eliminating the need for substrate processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the contact point is positioned close to the card insertion opening to achieve miniaturization, then the connector size is reduced, but the contact pressure becomes insufficient
Solution Approach 1:
The patent introduces a movable starting point that moves in the up-down direction (perpendicular to the front-rear direction), adding a vertical dimension to the spring mechanism. This allows the spring portion to generate sufficient contact pressure through vertical movement while keeping the contact point close to the insertion opening in the front-rear direction, thus resolving the contradiction between miniaturization and contact pressure
Solution Approach 2:
The patent changes the spring constant parameter by using a short spring with a large spring constant, which compensates for the reduced spring length. The movable starting point mechanism allows this stiff spring to still achieve adequate contact pressure through the vertical movement component, enabling miniaturization without sacrificing contact force
2Force
If a long spring with small spring constant is used to achieve sufficient contact pressure, then the contact pressure is adequate, but the connector height increases
Solution Approach 1:
Instead of increasing spring length in the front-rear direction (which would increase connector height), the patent utilizes the up-down direction for the movable starting point's movement. This dimensional shift allows the spring to generate adequate contact pressure through vertical displacement while maintaining a compact overall height of the connector
Solution Approach 2:
The patent changes the spring constant parameter to a large value, allowing the use of a short spring that can generate sufficient contact pressure without requiring excessive length. The movable starting point mechanism ensures that this short spring with high spring constant can still achieve the required contact force through its vertical movement capability
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 design achieves miniaturization while securing sufficient contact pressure and lowering the height of the contact, allowing for efficient connection to nano SIM cards without requiring substrate processing, and can be adapted for various SIM card formats.
Implementation Method 1
The spring portion is provided with a contact point which is to be in contact with the terminal of the card. The movable starting point is movable in an up-down direction perpendicular to the front-rear direction.
Data Source
AI summary
A connector is connectable with a card which is inserted from an insertion opening. The card has a terminal. The connector comprises a holding member and a contact. The holding member has a rear support portion and a front support portion. The contact is held by the holding member. The contact has a base portion and a spring portion. The base portion has a rear supported portion, a front supported portion and a movable starting point. The rear supported portion is supported by the rear support portion. The front supported portion is supported by the front support portion. The movable starting point is positioned between the rear supported portion and the front supported portion. The spring portion extends frontward from the movable starting point in a front-rear direction. The spring portion is provided with a contact point which is to be in contact with the terminal of the card.