Test Socket Segmented Probe Design for Tin Accumulation
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Solution Overview
Problem
Conventional test sockets, particularly those using pogo pins, face issues with increased contact resistance due to tin accumulation, high maintenance costs, and the need for frequent replacement of entire pins, which affects testing accuracy and reliability.
Innovation Solution
A test socket design featuring a spring probe with a lower plunger and an upper plunger that form multiple contact points, allowing for stable electrical connection and easy replacement of only the contact probe, reducing maintenance costs and ensuring stable signal transmission.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If a pogo pin with spring is used for repeated testing, then the test socket can maintain elastic contact force, but tin accumulation on the pin increases contact resistance and reduces testing reliability
Solution Approach 1:
The test socket is divided into three separate functional components: a contact probe (upper probe) that contacts the test device terminal, a spring probe providing elastic force, and a lower plunger contacting the tester pad. This segmentation allows the contact probe to be replaced independently when contaminated, while the expensive spring mechanism and lower plunger are reused, resolving the contradiction between maintaining contact force and ensuring testing reliability.
2Reliability
If the upper pin is damaged during repeated testing, then the entire pin must be replaced, but this increases replacement cost and maintenance complexity
Solution Approach 1:
The contact probe is designed as a separate replaceable component distinct from the spring probe and lower plunger. When the contact probe becomes damaged or contaminated, only this specific component needs to be replaced, not the entire assembly. This reduces maintenance costs and simplifies repair procedures while maintaining contact reliability.
Solution Approach 2:
The design allows the contact probe to be discarded and replaced independently, while the more expensive spring mechanism and lower plunger are recovered and reused. This selective replacement strategy reduces overall maintenance costs while ensuring continuous operational reliability.
3Reliability
If ultrasonic cleaning is applied to restore pogo pin reliability, then contact resistance is reduced, but testing time and cost increase
Solution Approach 1:
The harmful tin accumulation and contamination are extracted from the system by removing and replacing only the contact probe, which is designed to be easily replaceable. This eliminates the need for time-consuming ultrasonic cleaning processes while maintaining contact reliability, as the contaminated component is simply swapped out for a fresh one.
4Ease of manufacture
If a conventional embedded socket pin structure is used, then manufacturing is straightforward, but the entire pin must be replaced when damaged, increasing maintenance complexity
Solution Approach 1:
The socket structure is segmented into modular components (contact probe, spring probe, lower plunger) that can be manufactured separately and assembled. This modular approach maintains manufacturing simplicity while enabling independent replacement of the contact probe, reducing overall device complexity for maintenance purposes.
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 maintains stable electrical connections with low resistance and allows for cost-effective maintenance by replacing only the contact probe, enhancing testing accuracy and reducing operational costs.
Implementation Method 1
a spring probe made of a cylindrical spring for applying elasticity to the lower plunger and the upper plunger
Data Source
AI summary
A test socket including: a testing probe including a lower plunger in contact with a pad; an upper plunger coupled to the lower plunger; a spring probe made of a cylindrical spring for applying elasticity to the lower plunger and the upper plunger; and a contact probe with an upper side contacting a terminal of a test device and a lower side contacting the upper plunger; a socket housing that provides housing holes and accommodates the contact probe and the spring probe so that an upper side of the contact probe protrudes at each housing hole; and a cover that provides cover holes and is fastened to the socket housing so that a lower side of the lower plunger protrudes at each cover hole, wherein the upper plunger provides a sliding groove, the lower plunger provides a pair of sliding protrusions inserted into the sliding groove.