Flexible Printed Board Recognition Mark Coverlay Design
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Solution Overview
Problem
Flexible printed boards with copper foil recognition marks face issues of reduced recognition accuracy due to the copper foil being stripped from the base film, especially when bent or subjected to vibrations, and the entire surface coverage with coverlay causing curvature and misinterpretation by cameras.
Innovation Solution
A flexible printed board design featuring a copper foil pattern with a hollow shape and a coverlay with an opening, where the outer circumferential section is covered and the inner section is exposed, preventing stripping while maintaining recognition accuracy through strategic coverlay placement.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the coverlay covers the entire surface of the recognition mark, then the copper foil is prevented from being stripped from the base film, but the recognition accuracy is reduced due to curvature and distortion
Solution Approach 1:
The coverlay is designed with a local opening that exposes only the necessary portion of the recognition mark (the hollow inner section) while covering the outer circumferential section where copper foil stripping is most likely to occur. This localized differentiation allows the coverlay to provide protection exactly where needed without interfering with the camera's ability to accurately read the recognition mark through the exposed hollow section.
2Adaptability or versatility
If the copper foil is exposed to prevent stripping, then the board can be bent and vibrated, but the copper foil may still be stripped under vibration and bending conditions
Solution Approach 1:
The coverlay is applied in advance to the base film, creating a protective layer that cushions and reinforces the copper foil pattern before the board undergoes bending or vibration. This pre-applied coverlay prevents the copper foil from being stripped during subsequent mechanical stress, while the opening in the coverlay maintains recognition accuracy.
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
Prevents copper foil stripping from the base film and maintains high recognition accuracy even when the board is bent or subjected to vibrations, ensuring accurate reading by cameras.
Implementation Method 1
a coverlay having an opening formed therein, wherein the coverlay is bonded to the base film and covers the outer circumferential section of the copper foil pattern
Data Source
AI summary
An objective of the present invention is to prevent a copper foil used as a recognition mark from being stripped from a base film in a flexible printed board while preventing the recognition accuracy for the recognition mark from being reduced. A flexible printed board includes a base film; a copper foil pattern on the base film, wherein the copper foil pattern has a hollow shape with an outer circumferential section and an inner circumferential section and is configured to function as a recognition mark; a coverlay having an opening formed therein, wherein the coverlay is bonded to the base film and covers the outer circumferential section of the copper foil pattern such that an edge of the opening is positioned between the outer circumferential section and the inner circumferential section of the copper foil pattern.