Tapered IC Socket Contact for Stable Connection
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Solution Overview
Problem
Conventional IC sockets face challenges in maintaining connection stability without increasing sliding resistance, particularly when the length reduction of contact pins is small, due to the design limitations of cylindrical plungers and straight plungers which lead to instability and excessive friction.
Innovation Solution
The design incorporates a first contact member with a cylindrical shape and a second contact member with a tapering internal contact portion that expands, along with a coil spring urging mechanism, allowing for stable contact without increased sliding resistance, even with minimal length reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional cylindrical plungers or straight plungers are used, then the structure is simple, but connection stability deteriorates and sliding resistance increases
Solution Approach 1:
The internal contact portion is designed with a specific tapered shape that expands from the insertion end toward the other end, creating localized geometric properties that enhance connection stability without requiring complex overall structure. This local geometric optimization allows stable contact while maintaining simplicity.
Solution Approach 2:
The contact geometry is changed from cylindrical or straight configurations to a tapered configuration where the internal contact portion expands along its length. This parameter change in shape geometry improves connection stability while the tapered design actually reduces sliding resistance compared to conventional forms.
2Length of moving object
If the length of contact pins is reduced, then the device size is minimized, but connection stability deteriorates and sliding resistance increases
Solution Approach 1:
Even with reduced overall length, the internal contact portion incorporates a tapered geometry that expands from the insertion end, creating optimal local contact characteristics. This local geometric optimization compensates for the reduced length, maintaining connection stability and minimizing sliding resistance in compact designs.
Solution Approach 2:
The tapered configuration of the internal contact portion introduces curved geometric properties that improve contact characteristics. The expanding shape along the length provides progressive engagement that enhances stability in shorter contact pins while reducing friction through the curved contact surface.
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
This configuration enhances connection stability between the IC package and the wiring substrate by ensuring consistent contact without increasing sliding resistance, utilizing simple coil springs and minimizing friction, thus improving the reliability of electrical connections during tests like burn-in tests.
Implementation Method 1
an urging member which urges the first contact member and the second contact member toward a direction to separate the first contact member and the second contact member
Implementation Method 2
the urging member is a coil spring located inside of the external cylinder portion in an extensible manner
Implementation Method 3
the internal contact portion has a taper shape which expands from an end of being inserted into the first contact member toward the other end, and is formed so as to contact with the internal surface of the external cylinder portion
Implementation Method 4
the internal contact portion has a taper shape which expands from an end of being inserted into the first contact member toward the other end
Data Source
AI summary
An electric contact which can improve the connection stability without increasing the sliding resistance even when the amount of reduction in the lengths of the electric contact is little. A preferred embodiment of the present invention comprises a first plunger which has conductivity and has an external cylinder portion; a second plunger which has internal contact portion to be inserted into the external cylinder portion, is interlinked with the first plunger in an extensible manner and has conductivity; and a coil spring which urges the first and second plungers toward a direction to separate them. The internal contact portion has a taper shape which expands towards the lower end from the upper end, and is formed so as to contact with the internal surface of the external cylinder portion and conduct to the external cylinder portion.