Conductive Probe Card Cleaning Element Wear Detection

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Solution Overview

Problem

The existing probe card cleaning systems require manual and visual inspection for wear detection, leading to inefficiencies and errors in semiconductor chip testing due to labor-intensive replacement processes and potential missed detection of worn cleaning elements, resulting in rejection of good chips.

Innovation Solution

A conductive probe card cleaning element with embedded metallic particles that allows for automated wear detection by measuring changes in conductivity, eliminating the need for manual inspection and ensuring timely replacement.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If manual visual inspection is used to detect cleaning element wear, then the system can identify worn cleaning elements, but labor costs increase and inspection errors may occur leading to rejection of good chips

Engineering Contradiction:

Improvecleaning element wear detection accuracyVSAvoidmanual inspection labor burden

Core Design Contradiction:

ReliabilityVSEase of operation

Solution Approach 1:

The patent replaces the manual visual inspection system with an automated electrical conductivity measurement system. The cleaning element is made conductive through embedded metallic particles, and its wear is detected by measuring changes in electrical conductivity using probe cards and ATE equipment, eliminating the need for manual inspection while maintaining detection accuracy.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The cleaning element itself provides the detection mechanism through its conductive properties. As the cleaning element wears during use, its conductivity changes in a measurable way, allowing the system to self-monitor its own condition without external inspection, thereby reducing labor and improving reliability.

Inventive Principle:

Principle #25Self-service

2Reliability

If cleaning elements are replaced frequently to ensure cleanliness, then chip testing quality is maintained, but productivity decreases due to unnecessary replacements

Engineering Contradiction:

Improvechip testing qualityVSAvoidtesting batch throughput

Core Design Contradiction:

ReliabilityVSProductivity

Solution Approach 1:

The patent implements a feedback mechanism where the conductivity of the cleaning element is continuously monitored during operation. This real-time feedback allows the system to determine the actual wear state of the cleaning element and schedule replacements only when necessary, preventing both premature replacement and delayed replacement, thus optimizing both quality and productivity.

Inventive Principle:

Principle #23Feedback

3Reliability

If labor is allocated to inspect cleaning elements, then worn elements can be replaced, but time is wasted and errors may occur leading to rejection of good chips

Engineering Contradiction:

Improvecleaning element maintenance reliabilityVSAvoidinspection and replacement time

Core Design Contradiction:

ReliabilityVSLoss of time

Solution Approach 1:

The patent replaces the human labor-based inspection system with an automated electrical measurement system. The ATE equipment automatically measures the conductivity of the cleaning element during normal testing operations, eliminating the time required for manual inspection and removing human error from the process, thereby improving both reliability and time efficiency.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

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 system automates the maintenance of probe cards, reducing labor costs and preventing accidental rejection of usable chips by alerting personnel when the cleaning element needs replacement, thus maintaining consistent testing quality.

Implementation Method 1

The cleaning element may be impregnated with metallic particles that raise the conductivity of the cleaning element to a degree which can be measured by the same probe card which tests the wafers or chips in a carrier.

Methodology Applied

Scientific EffectElectrical Conductivity: Conduction (electrical)

Data Source

PatentUS20240402219A1Probe card cleaning element wear detection system

Publication Date: 2024.12.05 SMITH WAYNE COOPER

AI summary

A cleaning element and a method for utilizing the cleaning element within a semiconductor testing procedure may improve the efficiency of testing semiconductor wafers or chips by eliminating the need for personnel to manually and visually inspect cleaning elements when worn out. The cleaning element may be impregnated with conductive particles that lower the conductivity of the cleaning element to a degree which can be measured by the same probe card which tests the wafers. As the cleaning element is worn by usage in cleaning the probe tips, the conductivity will increase. The testing process using the probe card will periodically pause testing procedure, both to be cleaned by the cleaning element, and also to test the conductivity of the cleaning element.