Bellows Contactor Segmentation for Low Contact Resistance

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Solution Overview

Problem

The existing contactors for integrated circuit inspection probes face challenges in ensuring a desired displacement amount while maintaining low contact resistance, as the meandering portion's limited folding times lead to increased electric resistance, limiting the length of the contactor.

Innovation Solution

A contactor design featuring a bellows body with a fixed and movable portion, where the movable portion compresses the bellows body to contact the fixed touch piece, reducing contact resistance through short-circuit occurrence, and incorporating connecting projections and specific contact positions to stabilize operation and enhance reliability.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Length of moving object

If the number of folding times of the meandering portion is increased to ensure desired shrinkage amount, then the displacement amount is improved, but the electric resistance increases making it difficult for current to flow

Engineering Contradiction:
Improvedisplacement amountVSAvoidelectric conductivity
Core Design Contradiction:
Length of moving objectVSReliability

Solution Approach 1:

The meandering portion is divided into multiple separate meandering sections rather than one continuous long path. Each meandering section has its own folding times, allowing the total displacement to be distributed across segments. This segmentation breaks the continuous conductive path into manageable sections, reducing the cumulative electric resistance while achieving the desired total displacement amount.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The patent introduces a multi-dimensional approach by arranging meandering portions in parallel and adding vertical stacking dimensions. Instead of extending the meandering path in a single direction (which increases resistance), the design uses multiple folding times in parallel arrangements and stacked layers, achieving greater displacement through spatial distribution rather than linear extension, thus maintaining lower electric resistance.

Inventive Principle:
Principle #17Another dimension (Dimensionality change)

2Length of moving object

If the contactor is lengthened to ensure desired displacement amount, then the shrinkage amount is improved, but the meandering portion becomes narrow increasing electric resistance

Engineering Contradiction:
Improvecontactor lengthVSAvoidelectric conductivity
Core Design Contradiction:
Length of moving objectVSReliability

Solution Approach 1:

The contactor is segmented into multiple independent meandering sections that can be arranged in parallel. Each section maintains adequate width for good electrical conductivity, while the parallel arrangement of multiple sections achieves the desired total displacement amount without requiring any single section to be excessively narrow or long.

Inventive Principle:
Principle #1Segmentation

Solution Approach 2:

The meandering portions are designed to serve multiple functions simultaneously: they provide mechanical displacement through folding, maintain electrical conductivity through adequate width, and enable parallel arrangement for increased total displacement. This multi-functionality allows the same structural element to achieve both long displacement and low resistance without compromise.

Inventive Principle:
Principle #6Universality (Multi-functionality)

3Area of stationary object

If the meandering portion is made narrow to fit in compact space, then the compactness is improved, but the electric resistance increases making current flow difficult

Engineering Contradiction:
Improvecontactor widthVSAvoidelectric conductivity
Core Design Contradiction:
Area of stationary objectVSReliability

Solution Approach 1:

Instead of making a single narrow meandering portion, the design segments the conductive path into multiple wider meandering sections arranged in parallel. Each section maintains sufficient width for low electrical resistance, while the parallel configuration achieves the desired compact overall width by distributing the current path across multiple channels rather than forcing a single narrow path.

Inventive Principle:
Principle #1Segmentation

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 achieves reduced contact resistance and improved usability by allowing a short-circuit mechanism, enabling efficient current flow and long contactor length, with options for high contact pressure or low operation force depending on contact positioning.

Implementation Method 1

the movable portion is depressed to compress the bellows body and bring the movable portion into contact with the fixed touch piece of the fixed portion

Methodology Applied
Scientific EffectElastic deformation: Elasticity

Data Source

PatentEP2747212B1contactor
Publication Date: 2017.08.09 OMRON CORP
  • EP2747212B1 patent drawingFigure 1(A)~1(C)
  • EP2747212B1 patent drawingFigure 2(A)~2(C)
  • EP2747212B1 patent drawingFigure 3(A)~3(C)

AI summary

Provided is a contactor having desired conductivity while ensuring a predetermined displacement amount. To this end, the contactor has: a bellows body (20); a fixed portion (30) connected to one end (21) of the bellows body (20) and provided with fixed touch pieces (33, 34) extending along the bellows body (20); and a movable portion (40) connected to the other end (22) of the bellows body (20). The movable portion (40) is depressed to compress the bellows body (20) and bring the movable portion (40) into contact with the fixed touch pieces (33, 34) of the fixed portion (30).