FPCB Terminal Layout for Angled ZIF Connector Insertion
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Solution Overview
Problem
Flexible printed circuit boards (FPCBs) connected to zero insertion force (ZIF) connectors can experience short circuits when not fully connected or connected at an angle due to the zigzag arrangement of terminals.
Innovation Solution
The FPCB features two distinct areas with differently spaced terminals, where the first area has terminals with one end aligned at the same position and spaced apart by a first length, and the second area has terminals spaced apart by a second length, with the first length being greater than the second length.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If terminals are arranged in a zigzag form to accommodate connector misalignment, then adaptability to connection errors is improved, but the risk of short circuits increases due to contact points touching non-corresponding terminals
Solution Approach 1:
The connector contact points are divided into two distinct groups: a first group with contact points spaced at a first interval, and a second group with contact points spaced at a second interval that is different from the first interval. This segmentation allows each group to independently accommodate misalignment in different directions, preventing short circuits while maintaining adaptability to connection errors
Solution Approach 2:
The contact points in the first group are arranged with a first interval between adjacent points, while contact points in the second group are arranged with a second interval that differs from the first interval. This asymmetric arrangement ensures that misalignment in one direction does not cause contact points to touch non-corresponding terminals, thereby preventing short circuits while maintaining adaptability to connection errors
2Device complexity
If terminals are arranged in a straight line for simple structure, then device complexity is reduced, but reliability decreases when the FPCB is not completely connected or connected at an angle
Solution Approach 1:
The terminal arrangement is segmented into two groups with different spacing intervals. The first group has contact points spaced at a first interval, while the second group has contact points spaced at a second interval. This segmentation maintains structural simplicity while preventing short circuits during partial or angled connections
Solution Approach 2:
The spacing interval between contact points is changed between the two groups. The first group uses a first interval while the second group uses a second interval that differs from the first. This parameter change ensures that misalignment does not cause non-corresponding terminal contact, improving reliability without significantly increasing complexity
Data Source
AI summary
According to various embodiments of the disclosure, an electronic device may include: a printed circuit board; a connector disposed on one surface of the printed circuit board and including a first contact portion and a second contact portion spaced apart from the first contact portion; and a flexible printed circuit board at least a part of which is connected to the connector. The flexible printed circuit board may include: two first areas formed on one surface of the flexible printed circuit board and each having a length in a width direction from one side or the other side of the one surface; and a second area formed between the first areas. Each of the first area and the second area may include a plurality of first terminals in contact with the first contact portion and disposed at intervals in the width direction of the flexible printed circuit board; and a plurality of second terminals in contact with the second contact portion and spaced apart from the plurality of first terminals in a longitudinal direction of the flexible printed circuit board. In the first area, one end of the plurality of first terminals may be formed at a same position in the longitudinal direction of the flexible printed circuit board, and the plurality of second terminals are spaced apart from the plurality of first terminals by a first length, respectively. In the second area, at least some of the plurality of first terminals may be spaced apart from at least some of the plurality of second terminals by a second length, respectively. The first length may be greater than the second length.