Many FPCB designer are not familiar with the manufacturer and bring lot of quality issue after mass production. Here I summary some of the design notices for the flex cable (FPCB) manufacturing ability to prevent future quality fail.
1. Relationship between Through Hole, Land, Cover Film, and Cover Coat| Not Recommended | Recommended |
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| The “Cover Film” must over to the soldering pad to prevent it from peeling off while soldering. |  |
| Not Recommended | Recommended |
| No sudden expansion or reduction in pattern width. No sharp angle. | 避免在線路寬度突然變大或縮小，造成不應該的尖角出現。 |
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| Not Recommended | Recommended |
| If the FPC need to be folded then the folding area shall be covered with cover film to prevent trace breaking. | 如果軟板有彎折的需要時，建議Cover Film必須覆蓋過彎折處，以避免線路折斷。 |
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| Avoid folding at below locations to eliminate the possible stress focus a. The change of pattern width. b. Folding parallel to the pattern. | 避免以下的彎折及方法： a.線路寬度改變的地方。 b.平行線路彎折。 |
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| Not Recommended | Recommended |
| Plating leads and disconnection holes should be designed as illustrated in order to avoid short circuits. | 相鄰線路應該盡可能用最大角度展開以避免短路。 |
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| Not Recommended | Recommended |
| Avoid ending edge locate at same location for each layer. | |
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