IC Socket Plunger Asymmetry Prevents Erroneous Assembly
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Solution Overview
Problem
The existing Kelvin inspection IC sockets require complex machining of the plunger's side surfaces, leading to increased fabrication costs and the risk of erroneous assembly due to the need for multiple machining places.
Innovation Solution
The IC socket design incorporates a plunger with a slider portion and a plunger guide hole that prevents rotation, featuring reduced machining on the side surfaces, ensuring correct assembly by projecting the plunger correctly or preventing it from projecting when inserted incorrectly.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If three places of the rounded bar member are cut out through machining to form side surfaces, then the plunger can be prevented from erroneous assembly, but the fabrication cost increases
Solution Approach 1:
The invention applies asymmetry by forming only one flat side surface on an otherwise rounded plunger body. This single asymmetric feature is sufficient to prevent erroneous assembly (where the plunger could be inserted 180 degrees wrong) while avoiding the need for multiple symmetric machining operations. The asymmetric shape creates a unique fit orientation between the plunger and its guide hole, ensuring correct assembly without increasing fabrication complexity.
2Manufacturing precision
If multiple machining places are created on the plunger, then assembly correctness is ensured, but the fabrication workload increases
Solution Approach 1:
The invention extracts the essential function of preventing erroneous assembly from multiple machining features and implements it through a single extracted feature - one flat side surface. By taking out only the minimum necessary machining (one flat surface) from the rounded bar member, the design achieves assembly correctness while minimizing fabrication workload. This extraction principle eliminates redundant machining operations that would not add functional value.
3Reliability
If the tip-side body portion is offset from the central axis, then erroneous assembly is prevented, but the plunger requires complex shaping
Solution Approach 1:
The invention uses asymmetry in a simplified form - rather than offsetting the entire tip-side body portion from the central axis (which would create complex 3D geometry), it applies asymmetry locally through a single flat side surface on the rounded plunger body. This local asymmetric feature is sufficient to prevent erroneous assembly while maintaining the simplicity of the overall plunger shape and avoiding complex shaping operations.
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 design reduces the fabrication workload and cost by minimizing side surface machining while effectively preventing erroneous assembly, ensuring accurate probe insertion and reducing production expenses.
Implementation Method 1
a plunger 8 assembled to one end side of the tube 7 and biased by a spring member 11 housed in the tube 7 such that a tip contacts the terminal 3 of the electronic component 2
Data Source
AI summary
A plunger of the probe has a slider portion engaged with a plunger guide hole formed in a socket body, which is prevented from rotating, and first and second positioning surfaces having different vertical positions along a central axis of the probe by cutting two places of a rounded bar member in a radial direction. The probe receptacle has a first abutting protrusion on which the first positioning surface is abuttable and a second abutting protrusion on which the second positioning surface is abuttable when the probe is inserted in a correct posture. When the plunger is inserted in an erroneous posture, the first positioning surface abuts on the second abutting protrusion to prevent the plunger from projecting from the plunger guide hole or project the plunger by an amount less than the design dimension.