Probe Card Fixation via Hot-Melt Composite Layer
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Solution Overview
Problem
Conventional probe cards for testing flat-plate-shaped devices, such as integrated circuits, face instability due to looseness between the probes and the substrate, leading to a relative positional change among probe tips, which prevents high-density arrangement.
Innovation Solution
A method for manufacturing a probe card involves creating probes with a metal layer of higher wettability and covering them with a hot-melt material to secure the probes to a substrate, ensuring a stable positional relationship among probe tips through a conductive jointing material layer that solidifies within the substrate's through holes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If probes are simply inserted into through holes and thrust on connecting portions, then the manufacturing process is simple, but the probes become unstable and relative positions change
Solution Approach 1:
The patent applies composite materials by combining a metal layer with higher wettability and a hot-melt material to create a composite fixing structure. The metal layer is formed on the attaching portion of the probe, and the hot-melt material is applied over the metal layer to secure the probe to the substrate, creating a composite material system that achieves both ease of manufacture and reliable positioning
Solution Approach 2:
The patent utilizes parameter changes by controlling the wettability of the metal layer and the melting/solidification behavior of the hot-melt material. The metal layer is designed to have higher wettability than the attaching portion, and the hot-melt material is applied in a molten state then solidified to fix the probe, leveraging phase change and surface energy parameters to achieve stable fixation
2Ease of operation
If probes are loosely fitted in through holes, then assembly is easy, but high-density arrangement cannot be achieved due to position changes
Solution Approach 1:
The patent employs parameter changes by utilizing the wettability parameter of the metal layer and the phase change parameter of the hot-melt material. The metal layer's higher wettability ensures proper adhesion, while the hot-melt material transitions from liquid to solid state to lock the probe in precise position, achieving both easy assembly and high positioning precision
Solution Approach 2:
The patent introduces an intermediary substance (the hot-melt material) between the probe's attaching portion and the substrate. This intermediary material facilitates easy assembly by allowing the probe to be inserted and then provides precise positioning through controlled solidification, acting as a mediator that resolves the contradiction between ease of assembly and positioning precision
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 method allows for easy and firm fixation of probes, maintaining a stable relative positional relationship among probe tips, enabling a high-density arrangement and secure connection to a wiring board.
Implementation Method 1
a third step of melting the hot-melt material of each attaching portion and thereafter solidifying the hot-melt material in a state where the hot-melt material contacts the part of the metal layer and a part of a wall surface of the through hole to fix each probe to the probe substrate
Implementation Method 2
forming at a part of the circumferential surface a metal layer having higher wettability than that of the attaching portion
Data Source
AI summary
A method for manufacturing a probe card prepares a plurality of probes, each having a metal layer on an attaching portion, and hot-melt material covering the metal layer. Each probe is attached to a probe substrate by inserting its attaching portion into a different through hole of the probe substrate so that at least a part of the metal layer is located in the through hole. The hot-melt material of each attaching portion is melted and thereafter solidified such that the hot-melt material contacts the metal layer and a part of a wall surface of the through hole, to fix each probe to the probe substrate.