Anisotropic Conductive Sheet With Curved Paths to Prevent Terminal Damage

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Solution Overview

Problem

Anisotropic conductive sheets with exposed metal pins can damage semiconductor package terminals during electrical connection due to direct contact, especially when aligning and pressing the package onto the sheet.

Innovation Solution

The anisotropic conductive sheet design features conduction paths extending through the thickness direction with non-linear parts that absorb and disperse the pressing force, preventing direct contact and damage, and includes an insulation layer to fill gaps between conduction paths, reducing the risk of terminal damage during electrical testing.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If metal pins are exposed at the surface of the anisotropic conductive sheet, then electrical connection is achieved, but the terminal of the semiconductor package is easily damaged by direct contact with the metal pin

Engineering Contradiction:

Improveelectrical connection reliabilityVSAvoidterminal damage

Core Design Contradiction:

ReliabilityVSObject-affected harmful factors

Solution Approach 1:

The patent introduces a non-linear portion (intermediary structure) between the metal pin and the terminal that absorbs and disperses pressing force. This non-linear portion acts as a mediator that prevents direct harmful contact between the rigid metal pin and the fragile terminal, while still allowing electrical connection to be established.

Inventive Principle:

Principle #24Intermediary (Mediator)

Solution Approach 2:

The non-linear portion is designed in advance as a cushioning structure that absorbs pressing force before it reaches the terminal. By incorporating this force-absorbing element beforehand in the conduction path, the patent prevents terminal damage from occurring during the electrical connection process.

Inventive Principle:

Principle #11Beforehand cushioning (Prior cushioning)

2Reliability

If a linear conduction path is used, then electrical connection is established, but pressing force concentrates on the terminal causing damage

Engineering Contradiction:

Improveelectrical connectionVSAvoidpressing force concentration

Core Design Contradiction:

ReliabilityVSForce

Solution Approach 1:

The patent applies curvature by introducing a non-linear portion (such as a bent or curved section) in the conduction path instead of a straight linear path. This curved structure increases the path length and distributes the pressing force along the curved trajectory, reducing force concentration at any single point, particularly at the terminal end.

Inventive Principle:

Principle #14Spheroidality (Curvature)

3Ease of manufacture

If the conduction path is shortened, then manufacturing is simplified, but the ability to absorb pressing force is reduced

Engineering Contradiction:

Improveconduction path fabricationVSAvoidpressing force absorption

Core Design Contradiction:

Ease of manufactureVSReliability

Solution Approach 1:

The patent applies local quality by making the conduction path non-uniform: most of the path remains linear for manufacturing simplicity, but a specific localized portion is made non-linear to provide force absorption functionality. This allows the structure to achieve both ease of manufacture and effective force dissipation.

Inventive Principle:

Principle #3Local quality

Data Source

PatentUS11860193B2Anisotropic conductive sheet, anisotropic conductive composite sheet, anisotropic conductive sheet set, electric inspection device and electric inspection method

Publication Date: 2024.01.02 MITSUI CHEMICALS INC

AI summary

This anisotropic conductive sheet includes: a plurality of conductive paths; and an insulation layer which is disposed to fill the space between the plurality of conductive paths and has a first surface and a second surface. Each of the conductive path extends in a thickness direction of the insulation layer and has a first end part on the first surface side and a second end part on the second surface side. When the conductive paths are seen through so that the center of the first end part overlaps the center of the second end part, at least a portion of the conductive paths does not overlap the first end part and the second end part.