Probe Tip Reinforcement for Semiconductor Wafer Testing
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Solution Overview
Problem
Conventional electrical test probes for semiconductor integrated circuits face issues with probe tip breakage and durability due to bending forces and fragility, especially when contacting the edges of semiconductor wafers during electrical testing.
Innovation Solution
The electrical test probe design incorporates a probe tip reinforcement portion made of a harder material than the probe main body, which extends along the side surface of the probe tip to absorb bending forces, and a multi-layer structure with a hard metal layer and a flexible metal layer to enhance abrasion resistance and durability.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Strength
If the probe tip portion is made of highly hard metal material to suppress abrasion, then abrasion resistance is improved, but the probe tip portion becomes fragile and susceptible to breakage under bending forces
Solution Approach 1:
The probe tip portion is constructed as a composite structure combining a hard metal material layer (for abrasion resistance) with a flexible metal material layer (for breakage resistance). This multi-layer composite design allows the hard outer layer to resist wear while the flexible underlying layer provides toughness and prevents catastrophic failure under bending forces.
Solution Approach 2:
Different regions of the probe tip portion are assigned different material properties: the outer surface layer uses hard metal material for abrasion resistance, while the inner core or base portion uses flexible metal material for structural integrity and breakage resistance. This local differentiation of material quality optimizes both wear resistance and structural reliability.
2Duration of action of stationary object
If the probe tip portion is made of highly hard metal material to prevent abrasion, then durability against wear is improved, but the fragility causes defect or breakage when load is applied
Solution Approach 1:
The probe tip portion employs a composite material structure where a hard metal layer provides long-term wear resistance for extended durability, while an integrated flexible metal layer or reinforcement structure prevents catastrophic defects and breakage under applied loads, thereby achieving both prolonged service life and high reliability.
Solution Approach 2:
The flexible metal material layer or reinforcement portion is positioned beneath or around the hard metal tip to act as a cushioning layer that absorbs impact and distributes stress before it reaches the brittle hard material, preventing defects and breakage before they occur under load conditions.
3Strength
If the probe tip portion is made of highly hard metal material to suppress abrasion, then wear resistance is improved, but bending forces from wafer edges cause breakage
Solution Approach 1:
The probe tip portion combines a hard metal material layer for wear resistance with a flexible metal material layer or integrated reinforcement structure that provides resistance to bending forces. The flexible component absorbs and distributes bending stresses from wafer edge contact, preventing breakage while the hard outer layer maintains wear resistance.
Solution Approach 2:
The probe tip portion features localized material differentiation where the contact surface or outer layer uses hard metal for wear resistance, while the base portion or embedded reinforcement uses flexible metal to specifically address bending force resistance from wafer edge contact, optimizing both wear and bending resistance in their respective locations.
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 reinforcement portion effectively prevents probe tip breakage and enhances durability by distributing bending forces, while the multi-layer structure provides excellent abrasion resistance and prevents defects, improving the probe's overall performance during electrical testing.
Implementation Method 1
elastic deformation of the arm portions of the probe acts on the probe, which enables the probe tip portion to connect the electrode appropriately and reliably
Data Source
AI summary
An electrical test probe comprises a probe tip portion and a probe main body portion having a pedestal portion on which the probe tip portion is formed to be protruded. The probe main body portion is made of a conductive material that is greater in toughness than the probe tip portion, and the probe tip portion is made of a conductive material that is higher in hardness than the material of the probe main body portion. On the pedestal portion is provided a probe tip reinforcement portion that contacts at least one side surface of the probe tip portion, extends toward a tip of the probe tip portion, and permits the tip of the probe tip portion to be protruded from its extending end in the extending direction. Also, the probe tip portion may be in a multi-layer structure having a first metal material layer that is higher in hardness than the tough metal material forming the probe main body portion and a second metal material layer that is greater in toughness than the first metal material layer.