Kelvin Contact Assembly With Insulated Blade Segmentation
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Solution Overview
Problem
The manufacturing process for microcircuits often results in defective devices due to subtle failures, and existing test equipment faces challenges in making accurate, low-resistance, and non-destructive electrical connections, leading to wear and contamination issues that affect testing accuracy and increase costs.
Innovation Solution
A contact assembly using an elastomeric component with an insulation layer between force and sense blades, configured to accommodate various shapes and sizes, which is robust, low-cost, and easy to clean, minimizing wear and contamination by avoiding convoluted conductive spring technologies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional conductive spring contacts are used to make electrical connections with microcircuit terminals, then electrical connection is achieved, but wear and contamination occur leading to poor connections and false defect indications
Solution Approach 1:
The patent employs inexpensive, replaceable contact assemblies with simple blade contacts instead of expensive, complex spring contacts. These disposable-like contacts are designed to be replaced when worn, preventing contamination spread and maintaining testing reliability without requiring complex maintenance of permanent contacts
Solution Approach 2:
The contact assembly is segmented into separate force contacts and sense contacts with insulation between them. This segmentation prevents conductive debris from causing short circuits between force and sense lines, eliminating a major source of false defect indications while maintaining reliable electrical connections
2Productivity
If test equipment contacts are used extensively to test many devices, then productivity increases, but contact wear increases leading to contamination and false defect indications
Solution Approach 1:
The contact assemblies are designed to be inexpensive and easily replaceable, allowing high-volume testing without concern for long-term contact durability. Contacts can be swapped out when worn, enabling continuous high-productivity operation while maintaining connection accuracy
Solution Approach 2:
Worn contact assemblies are discarded and replaced with fresh ones rather than attempting to refurbish or clean them. This simple approach maintains testing reliability in high-volume production environments where contact wear is inevitable, and the cost of replacement is minimal compared to the value of accurate testing
3Reliability
If complex conductive spring contact structures are used, then electrical connection is achieved, but device complexity increases and maintenance becomes more difficult
Solution Approach 1:
Instead of complex, expensive spring contacts that require precise manufacturing and maintenance, the patent uses simple, inexpensive blade contacts that are easy to manufacture and replace. The simplicity of the design reduces device complexity while maintaining adequate connection stability for testing applications
Solution Approach 2:
Rather than using complex spring mechanisms to maintain contact pressure, the patent inverts the approach by using simple rigid blades with insulation between them. The force and sense contacts are electrically isolated from each other, achieving reliable connections through geometric arrangement and insulation rather than elastic compliance
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 solution provides reliable, accurate, and cost-effective electrical connections for microcircuit testing, reducing defects and maintenance costs by using a simple, configurable, and durable contact assembly that minimizes wear and contamination.
Implementation Method 1
an electrical insulation layer disposed between the second force blade and the second sense blade
Implementation Method 2
The elastomer is configured to be retained by the first force blade, the second force blade, the first sense blade, and the second sense blade
Data Source
AI summary
A contact assembly for a Kelvin testing system for testing integrated circuit devices is disclosed. The contact assembly includes at least one grouping of blades including a first force blade, a second force blade, a first sense blade, and a second sense blade; an electrical insulation layer disposed between the first force blade and the first sense blade and between the second force blade and the second sense blade; and an elongated elastomer. The elastomer is configured to be retained by the first force blade, the second force blade, the first sense blade, and the second sense blade. Each of the first force blade, the second force blade, the first sense blade, and the second sense blade includes a recess having an opening and sized to receive and retain at least a portion of the elastomer.