Probe Card Edge Sensor Variable Resistor Wear Compensation
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Solution Overview
Problem
The resistance value of the edge sensor in a probe card increases over time due to wear and deterioration of contact parts and elastic forces, leading to incorrect determination of needle contact with a wafer, necessitating frequent replacement and increased costs.
Innovation Solution
Incorporating a variable resistor between the first and second needles in the edge sensor, allowing the resistance value to be adjusted to maintain accurate contact determination, thereby prolonging the life of the probe card.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the probe card is used repeatedly for measuring semiconductor devices, then measurement productivity is improved, but the resistance value of the edge sensor increases due to wear and deterioration, leading to measurement precision degradation
Solution Approach 1:
The patent applies parameter changes by introducing a variable resistor that allows adjustment of the reference resistance value. As the edge sensor's resistance changes over time due to wear, the variable resistor enables dynamic adjustment of the reference resistance to maintain accurate contact determination, thus preserving measurement precision while continuing repeated measurements.
Solution Approach 2:
The patent implements dynamics by making the reference resistance adjustable rather than fixed. The variable resistor allows the reference resistance to adapt to changing conditions (wear of contact parts), enabling the system to maintain measurement accuracy throughout the probe card's operational life without requiring replacement.
2Device complexity
If the probe card is used for extended periods, then device complexity is reduced by avoiding replacement, but the resistance value increases beyond the threshold, causing reliability degradation
Solution Approach 1:
The variable resistor provides dynamic adjustment capability, allowing the reference resistance to be modified as the edge sensor deteriorates. This maintains reliable contact determination over extended periods without replacing the probe card, thus preserving reliability while avoiding the complexity of replacement procedures.
Solution Approach 2:
By changing the reference resistance parameter through the variable resistor, the system compensates for the increasing resistance of the edge sensor over time. This ensures that the comparison between edge sensor resistance and reference resistance remains valid, maintaining determination reliability throughout extended usage.
3Measurement precision
If the resistance value of the edge sensor becomes greater than the threshold, then measurement precision is maintained, but the probe card must be replaced, increasing loss of time and cost
Solution Approach 1:
The variable resistor enables dynamic adjustment of the reference resistance value, allowing the system to maintain measurement precision throughout the probe card's life. This eliminates the need for replacement due to resistance threshold exceeded, thereby reducing replacement work time and associated costs.
4Duration of action of stationary object
If the resistance value of the edge sensor increases over time, then durability is improved by extending probe card life, but measurement precision deteriorates when resistance exceeds threshold
Solution Approach 1:
The variable resistor allows continuous adjustment of the reference resistance parameter to match the aging edge sensor's characteristics. This enables the probe card to maintain measurement precision throughout its extended operational life, preventing the deterioration that would otherwise occur when resistance exceeds the fixed threshold.
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 variable resistor ensures accurate determination of needle contact with the wafer, extending the life of the probe card and reducing replacement costs by maintaining reliable measurements over time.
Implementation Method 1
the resistance value of the edge sensor in the short-circuit state becomes greater as measurements of semiconductor devices are repeated or as time elapses
Data Source
AI summary
A probe card has an edge sensor. The edge sensor has a first needle and a second needle. The first needle and the second needle are in contact with each other when the first needle and a wafer are not in contact with each other, and the first needle and the second needle are not in contact with each other when the first needle and the wafer are in contact with each other. The probe card has a resistor connected between the first needle and the second needle.