Element Transfer Sheet With Directional Stress for Uniform Spacing
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Solution Overview
Problem
Existing element transfer sheets struggle to maintain a sufficient interval between elements when expanded, leading to potential issues in transferring and handling semiconductor chips and other components.
Innovation Solution
The element transfer sheet incorporates a base material with specific tensile stress properties, where the tensile stress in the first direction is 12 MPa or more and the second direction is 9 MPa or more, combined with a pressure-sensitive adhesion layer featuring unevenness, to facilitate uniform expansion and increased element spacing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Length of stationary object
If the sheet is expanded to increase element spacing, then the interval between elements increases, but the uniformity of expansion and element spacing deteriorates
Solution Approach 1:
The patent applies parameter changes by precisely controlling the tensile stress values in different directions (first direction: 12-25 MPa, second direction: 9-20 MPa) to achieve uniform expansion. By adjusting these stress parameters within specific ranges, the sheet expands uniformly while maintaining consistent element spacing, resolving the contradiction between increasing interval and maintaining uniformity.
Solution Approach 2:
The patent uses a composite structure consisting of a base material and a pressure-sensitive adhesion layer with unevenness. This composite material design allows the base material to provide controlled tensile stress for uniform expansion while the adhesion layer maintains element attachment, enabling both increased spacing and uniformity simultaneously.
2Manufacturing precision
If the tensile stress in the first direction is increased to 12 MPa or more, then the expansion control improves, but the material strength requirement increases
Solution Approach 1:
The patent resolves this contradiction by specifying precise parameter ranges for tensile stress (first direction: 12-25 MPa, second direction: 9-20 MPa) and base material thickness (50-200 μm). These controlled parameters enable sufficient expansion control while managing material strength requirements through optimized design values within the specified ranges.
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 configuration allows for efficient and uniform expansion of the sheet, resulting in larger and more consistent intervals between elements, enhancing the transfer process and reducing positional deviation during handling.
Implementation Method 1
a pressure sensitive adhesion layer having unevenness on a surface
Implementation Method 2
a tensile stress in a first direction of the base material at 100% elongation is larger than a tensile stress in a second direction orthogonal to the first direction
Data Source
AI summary
An element transfer sheet is provided. The element transfer sheet includes a base material and a pressure sensitive adhesion layer having unevenness on the surface. A tensile stress in the first direction of the base material at 100% elongation is larger than a tensile stress in the second direction orthogonal to the first direction. The tensile stress in the first direction is 12 MPa or more, and the tensile stress in the second direction is 9 MPa or more.