SIM Card Connector Bifurcated Spring Design for Buckling Prevention
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Solution Overview
Problem
Existing connectors for SIM cards face challenges in miniaturization due to the need for increased contact length, which can lead to buckling issues when cards or adapters are inserted or removed, especially when the initial contact position is shifted or when using card adapters without SIM cards.
Innovation Solution
A connector design featuring a holding member with a contact that includes a fixed portion, a first spring portion, and a second spring portion, where the first spring portion is resiliently deformed by card or adapter insertion, and the second spring portion has a free end and contact point to prevent buckling, ensuring sufficient moving distance and contact pressure without damaging the circuit board.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the contact length is increased to secure sufficient moving distance of the contact point, then the contact pressure can be increased, but the connector cannot be miniaturized
Solution Approach 1:
The contact is divided into two separate spring portions: a first spring portion that provides resilient deformation and a second spring portion that provides contact pressure. This segmentation allows each portion to be optimized independently, enabling sufficient contact pressure with a shorter overall contact length, thus facilitating connector miniaturization.
Solution Approach 2:
The invention changes the structural parameters of the contact by introducing a bifurcated spring design with specific geometric configurations (press portion angle α between 45-135 degrees, support portion angle β between 45-135 degrees). These parameter optimizations enable adequate contact pressure while reducing the required contact length, allowing connector miniaturization.
2Reliability
If the initial position of the contact point is shifted above its original position to increase moving distance, then contact pressure can be increased, but the contact may be buckled during card insertion
Solution Approach 1:
By separating the contact into two distinct spring portions with different functional roles, the invention prevents buckling. The first spring portion handles the pressing action during insertion while the second spring portion maintains contact pressure, eliminating the instability that would occur with a single shifted contact point.
Solution Approach 2:
Different portions of the contact are given different structural qualities: the first spring portion has a press portion configured to resist buckling during insertion, while the second spring portion is optimized for maintaining contact pressure. This local differentiation of structural properties solves both the contact pressure and stability requirements.
3Stability of the object's composition
If the contact is designed to prevent buckling during card adapter insertion, then the contact stability is improved, but the moving distance of the contact point is reduced
Solution Approach 1:
The bifurcated spring design separates the functions of buckling prevention and contact pressure maintenance. The first spring portion's press portion prevents buckling during adapter insertion, while the second spring portion extends to provide adequate contact moving distance and pressure, resolving the contradiction between stability and movement range.
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 effectively prevents buckling during both insertion and removal of SIM cards and adapters, maintaining sufficient contact pressure and preventing damage to the circuit board, while allowing for a more compact design.
Implementation Method 1
the first spring portion is resiliently deformed by a movement of the inserting object (card or card adapter)
Implementation Method 2
When the inserting object is moved in the moving direction, the second spring portion is moved downward together with a movement of the movable starting point
Data Source
AI summary
The connector comprises a holding member and a contact which is held by the holding member. The contact has a fixed portion, a first spring portion and a second spring portion. The fixed portion is held by and fixed on the holding member. The first spring portion extends from the fixed portion. The first spring portion includes two pressed portions, a movable starting point and a movable end portion which is movable. When an inserting object is moved along a moving direction which is a forward direction or a rearward direction, the pressed portions are pressed by a press portion to be moved downward perpendicular to the moving direction. The inserting object is a card or a card adapter. The inserting object has the press portion. The second spring portion is provided with a free end and a contact point. When the inserting object is moved in the moving direction, the second spring portion is moved downward together with a movement of the movable starting point so that the inserting object is prevented from being brought into contact with the free end of the second spring portion.