Tapered Spring Contact Pin for IC Test Socket Friction
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Solution Overview
Problem
The challenge of creating test and burn-in sockets for IC devices with desired and repeatable performance characteristics is exacerbated by the small dimensions of spring contact pins, which experience mechanical friction leading to degraded performance and reduced longevity due to thousands of test cycles.
Innovation Solution
A uniquely designed spring contact pin with a tapered depressible probe member that prevents contact with the spring barrel end, ensuring smooth actuation and consistent force transfer, reducing frictional forces and preventing jamming.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If spring contact pins are made extremely small to accommodate high I/O density IC devices, then the I/O capacity increases, but mechanical friction between components increases leading to degraded performance and reduced longevity
Solution Approach 1:
The probe member is given a tapered configuration where the diameter gradually decreases from the base toward the tip. This curved/tapered geometry eliminates sharp corners and abrupt transitions that cause stress concentration and friction, allowing the probe to smoothly compress and retract through the spring barrel without mechanical binding, thereby maintaining reliability despite miniaturization
2Adaptability or versatility
If spring contact pins are made extremely small to accommodate high I/O density IC devices, then the I/O capacity increases, but the pin life cycle decreases due to frictional forces from thousands of test cycles
Solution Approach 1:
The tapered geometry of the probe member creates smooth transitional surfaces that reduce friction during repeated compression and retraction cycles. This curved design prevents mechanical binding and wear at the probe-spring barrel interface, enabling the contact pins to withstand thousands of test cycles without degradation, thus extending the pin life cycle while maintaining high I/O capacity
3Ease of manufacture
If conventional spring contact pins are used, then manufacturing is simpler, but frictional forces cause jammed actuation and inconsistent force transfer
Solution Approach 1:
The tapered probe member design, while slightly more complex than a simple cylindrical probe, can be efficiently manufactured using standard machining or molding processes. The gradual taper eliminates friction-induced jamming and ensures smooth actuation throughout the compression stroke, providing consistent force transfer to the IC device contacts without compromising manufacturing feasibility
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 results in consistent and predictable pin resistance over a longer life cycle, with improved mechanical and high-speed signal performance, maintaining efficient electrical connections throughout the life of the contact pins.
Implementation Method 1
a compression spring inside the spring probe barrel
Implementation Method 2
any slight mechanical friction between the components of the contact pins will have a negative effect on the contact pin's mechanical and electrical performance
Data Source
AI summary
A spring contact pin includes a depressible probe member having a tapered configuration that prevents contact between the projecting end of the probe member and the end of the spring barrel throughout the compression and release cycle of the probe. The tapered configuration of the depressible probe member improves the mechanical performance, reliability, and high-speed signal performance of the contact pin.