Probe Surface Film Material Selection for Adhesion Control
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Solution Overview
Problem
The existing electrical connection devices using gold (Au) films for both probe surface films and land surfaces on the wiring board experience adhesion issues, leading to peeling of the surface films during probe detachment, which affects measurement accuracy and causes probes to fall out of the probe head, resulting in uneven contact and varying land heights.
Innovation Solution
The use of a surface film material on the probes that is different in composition from the land material, such as noble metals like Pd, Ir, Pt, or Ru, reduces adhesion and maintains contact integrity by employing a base film and strike plated film structure to prevent metal diffusion and oxidation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If gold (Au) films are used for both probe surface films and land surfaces, then electrical resistance is reduced, but adhesion occurs causing surface films to peel off
Solution Approach 1:
The patent applies different material compositions to different locations: the land surface uses one material (e.g., Au) while the probe surface film uses a different material (e.g., Pd, Pt, Ir, or Ru). This local differentiation resolves the contradiction by maintaining low electrical resistance at contact points while preventing adhesion between dissimilar materials.
Solution Approach 2:
The patent employs composite material structures where the probe consists of a core material covered by a surface film with different composition from the land material. This composite approach allows optimization of each layer's properties: the core provides structural integrity while the surface film provides optimal electrical and adhesion characteristics.
2Reliability
If gold (Au) films are used for both probe surface films and land surfaces, then electrical resistance is reduced, but measurement accuracy decreases
Solution Approach 1:
The patent uses different materials optimized for specific functions: the probe surface film material (e.g., Pd, Pt, Ir, Ru) is selected to prevent adhesion and maintain measurement accuracy, while still providing low electrical resistance at the contact interface with the land surface.
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
This solution effectively suppresses adhesion between the probe and land surfaces, maintaining measurement accuracy and preventing probe detachment, thereby ensuring consistent contact and stable measurement performance.
Implementation Method 1
A material of surface film of the proximal end portion of the probe, the proximal end portion contacting the land, is different in composition from a material of the land
Implementation Method 2
employing a base film and strike plated film structure to prevent metal diffusion and oxidation
Implementation Method 3
employing a base film and strike plated film structure to prevent metal diffusion and oxidation
Data Source
AI summary
An electrical connection device includes: a wiring board in which lands are arranged on a main surface; and probes. Each of the probes has a distal end portion that contacts an object to be measured and a proximal end portion that contacts the land. A material of a surface film of the proximal end portion, which contacts the land, is a metal material different in composition from a material of the land that contacts the surface film.