PCB Protection Tape With Non-Uniform Adhesive Thickness
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Solution Overview
Problem
In display devices, the risk of conductive wirings on printed circuit boards (PCBs) contacting other electronic devices or frames during manufacturing or use can lead to unexpected electrical connections or short circuits, which existing solutions fail to adequately prevent.
Innovation Solution
A protection tape for PCBs is designed with an insulating base plate, a conductive layer, and an adhesive layer having varying thicknesses, where the adhesive layer includes a main part and a subsidiary part with different thicknesses and moduli, preventing air bubbles and ensuring secure attachment while minimizing the risk of adhesive layer movement outside the PCB area during attachment.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If a uniform thickness adhesive layer is used, then the attachment process is simple, but air bubbles are trapped and adhesive moves outside the PCB area
Solution Approach 1:
The adhesive layer is designed with non-uniform thickness, featuring a first thickness in a first area and a second thickness (greater than the first) in a second area. This local variation allows the adhesive to fill air gaps more effectively in certain regions while maintaining controlled bonding in others, preventing both air bubble entrapment and adhesive overflow.
2Reliability
If the adhesive layer is made thicker to prevent air bubbles, then air bubble entrapment is reduced, but adhesive moves outside the PCB area during attachment
Solution Approach 1:
By configuring different thicknesses in different areas, the patent achieves sufficient adhesive volume in the second area to prevent air bubbles, while the first area maintains a thinner profile that prevents overflow. This spatial differentiation resolves the contradiction between preventing air bubbles and avoiding adhesive migration.
3Device complexity
If a single-layer adhesive structure is used, then the structure is simple, but it cannot simultaneously prevent air bubbles and control adhesive movement
Solution Approach 1:
The adhesive layer is segmented into at least two distinct areas with different thickness characteristics. This segmentation allows each area to perform its specific function (one for air bubble prevention, another for controlled bonding) within a single integrated adhesive layer structure, achieving dual functionality without requiring multiple separate components.
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 protection tape effectively prevents defects by covering conductive wirings, reducing the risk of short circuits and ensuring secure attachment, while its conductive layer acts as a shield against electromagnetic interference.
Implementation Method 1
an adhesive layer over the conductive layer, the adhesive layer including a main part having a first thickness and a subsidiary part having a second thickness less than the first thickness
Implementation Method 2
the conductive layer acts as a shield against electromagnetic interference
Data Source
AI summary
A protection tape for a printed circuit board (PCB) includes an insulating base plate, a conductive layer over the insulating base plate, and an adhesive layer over the conductive layer, the adhesive layer including a main part having a first thickness and a subsidiary part having a second thickness less than the first thickness, the main part corresponding to at least a center portion of the insulating base plate and the subsidiary part being arranged at an outside of the main part.