Asymmetrical Probe Assembly for Semiconductor Wafer Testing
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Solution Overview
Problem
Conventional probe assemblies with symmetrical probe arrangements fail to maintain semiconductor wafers with asymmetrical electrode patterns stable during electrical testing, leading to lateral displacement and potential damage due to unbalanced biasing forces.
Innovation Solution
A probe assembly with asymmetrical probe groups, where the number of probes on each side of an imaginary line differs, and the direction of probe deformation is opposite for at least one group, reducing lateral biasing forces and preventing displacement by balancing the elastic deformation forces.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If a symmetrical probe arrangement is used, then the biasing forces are balanced and the semiconductor wafer is stable, but the probe assembly cannot accommodate asymmetrical electrode patterns on semiconductor wafers
Solution Approach 1:
The patent applies asymmetry by arranging probes in an asymmetrical pattern that matches the asymmetrical electrode arrangement on the semiconductor wafer. Specifically, the number of probes on different sides of the wafer is made different (e.g., 3 probes on one side, 2 probes on the other side), allowing the probe assembly to accommodate various electrode patterns while maintaining balance through careful configuration of probe directions.
2Adaptability or versatility
If an asymmetrical probe arrangement is used to match asymmetrical electrode patterns, then the probe assembly becomes adaptable to different electrode configurations, but unbalanced biasing forces cause lateral displacement of the semiconductor wafer
Solution Approach 1:
The patent uses the counterweight principle by introducing probes in opposite directions to counterbalance the biasing forces. Specifically, probes are arranged in both directions (e.g., some probes point left while others point right) so that the elastic deformation forces from probes in opposite directions cancel each other out, creating a balanced force distribution that prevents wafer displacement even with asymmetrical electrode patterns.
3Force
If the number of probes on both sides of the wafer is made equal, then the biasing forces are balanced, but the probe assembly cannot efficiently test wafers with different numbers of electrodes on each side
Solution Approach 1:
The patent applies dynamics by making the probe arrangement flexible and adaptable rather than fixed. The probe assembly can be configured with different numbers of probes on different sides (e.g., 3 and 2) to match the specific electrode pattern being tested, while still maintaining force balance through the directional arrangement of probes. This dynamic configuration allows efficient testing of various asymmetrical electrode patterns without compromising wafer stability.
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 probe assembly effectively stabilizes semiconductor wafers with asymmetrical electrode patterns during electrical testing, preventing lateral displacement and damage, while ensuring accurate contact and efficient testing without the need for re-adjustment.
Implementation Method 1
the tip of each probe is surely pressed against the corresponding electrode by taking advantage of flexural deformation of each inclined arm
Data Source
AI summary
A probe assembly having a plurality of probes, each of which is secured to an anchor portion on a probe base plate, extends in a direction apart from the anchor portion through a fulcrum, has a tip at the front end thereof, and the tip is elastically deformable at its front end side when pressed against a corresponding electrode pad. Two probe groups are constituted: in the first group, the tips are arranged on one side of an imaginary straight line of the probe base plate, while in the second probe group, the tips are arranged on the other side of the imaginary straight line. The numbers of the probes of both probe groups are different, and a part of the probes forming one probe group with more probes are arranged in the opposite direction to that of the other probes of the same probe group.