Conductive Ceramic Probe Contacts for Stable Pad Contact
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Solution Overview
Problem
The contactability of a probe apparatus used for inspecting electrical characteristics is reduced due to metal adherence and abrasion during cleaning, which necessitates frequent maintenance and affects the reliability of electrical connections.
Innovation Solution
A probe apparatus utilizing conductive ceramic materials for contact portions and an elastic portion to maintain stable contact with electrode terminals and pads, minimizing abrasion and maintaining contactability through elastic deformation and biasing mechanisms.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a metal contactor is used to electrically connect electrode terminals and electrode pads, then good electrical conductivity is achieved, but metal adhesion occurs on the contactor surface leading to reduced contactability
Solution Approach 1:
The patent applies composite materials by combining a metal base material with a diamond-like carbon coating. The metal provides electrical conductivity while the diamond-like carbon layer prevents metal adhesion and reduces friction. This composite structure resolves the contradiction between achieving good electrical contact and preventing metal adhesion that reduces contactability.
2Reliability
If cleaning work is performed using a brush or cleaning sheet to remove adhered metal, then contactability is restored, but the contactor is abraded reducing contactability
Solution Approach 1:
The diamond-like carbon coating on the contactor provides extreme wear resistance while maintaining low friction properties. This allows cleaning operations to be performed without significant abrasion to the contactor surface, thereby restoring contactability without damaging the contactor and maintaining its service life.
Solution Approach 2:
The patent changes the surface properties of the contactor by coating it with diamond-like carbon, which has fundamentally different tribological properties compared to bare metal. The coated surface has lower friction coefficient and higher hardness, which changes the interaction with cleaning tools and electrode surfaces, enabling effective cleaning without abrasion.
3Reliability
If repeated cleaning operations are performed to maintain contactability, then contact performance is sustained, but maintenance time and operational downtime increase
Solution Approach 1:
The diamond-like carbon coating dramatically reduces the frequency of required cleaning operations due to its non-stick properties and wear resistance. The coating prevents metal adhesion that would otherwise require frequent cleaning, thereby sustaining contact performance over extended periods and reducing maintenance time and operational downtime.
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 apparatus effectively suppresses the reduction in contactability, ensuring stable electrical connections and reducing maintenance needs, while preventing abrasion and potential short circuits.
Implementation Method 1
An elastic portion is elastically deformed in response to a change in the posture of the probe inside the housing, and biases the probe in a direction that cancels the displacement of the first contact portion
Data Source
AI summary
A probe apparatus includes: a housing; a probe that has a first contact portion and a second contact portion and is supported by the housing, and in which at least either the first contact portion or the second contact portion is made of a conductive ceramic material; and an elastic portion that is arranged inside the housing by abutting on the probe and the housing. A posture of the probe changes inside the housing such that a position of a contact region in the second contact portion in contact with an electrode pad changes in response to a displacement of the first contact portion. The elastic portion is elastically deformed in response to a change in the posture of the probe inside the housing, and biases the probe in a direction that cancels the displacement of the first contact portion.