FPC / PCB 工程計算機

補強板離彎折區距離計算器

估算 stiffener edge 與 bend tangent 需要保留的 setback 距離。

補強板離彎折區距離計算器怎麼用

補強板邊緣如果太靠近 FPC 彎折區，會形成應力集中，造成銅裂、coverlay 裂紋或彎折壽命下降。這個工具用彎折半徑、彎折區厚度與製程安全距離估算 stiffener setback。

A stiffener edge too close to the bend zone can concentrate stress and reduce flex life. This calculator estimates a practical setback from bend radius, flex thickness and process margin.

Stiffener setback estimate

公式: Recommended setback = bend radius + flex thickness x multiplier + process margin

  • Bend radius: planned inside bend radius.
  • Flex thickness: local flex-zone thickness.
  • Multiplier: user-defined thickness-based safety distance.
  • Process margin: extra space for bonding, routing and assembly tolerance.

公式依據

  • Formula basis: engineering setback rule combining bend radius, flex thickness multiplier and process margin.
  • Engineering note: final setback should be confirmed with the assembly fold path, manufacturer design rules and bend testing.

範例

With 1.5 mm bend radius, 0.15 mm flex thickness, 3x multiplier and 0.5 mm process margin, recommended setback is 2.45 mm.

輸入欄位

  • Flex thickness
  • Bend radius
  • Thickness multiplier
  • Process margin
  • Existing setback

結果輸出

  • Recommended setback
  • Design margin
  • Pass / warning indication

工程注意事項

  • Keep stiffener edge, adhesive edge and copper transitions away from bend tangent where possible.
  • Dynamic bend applications should use larger margins and cycle testing.
  • Connector support may conflict with bend setback, so review assembly geometry early.

驗證檢查

  • Stiffener edge distance
  • Bend reliability
  • Connector support
  • Assembly folding path

相關製程站

  • 線路設計 - Trace width, spacing, bend-zone routing, differential pair spacing
  • 壓合 / 貼合 - Lamination thickness, adhesive squeeze-out, registration, CTE mismatch
  • 可靠度驗證 - Bending test, thermal shock, peel strength, solder float, ionic contamination

相關計算器

FAQ

Is setback measured from the bend center?

Use a consistent definition in your drawing. This calculator treats setback as distance from the bend tangent or practical bend boundary to the stiffener edge.

Can this replace bend testing?

No. It is an early design check. Dynamic and high-reliability applications need validation testing.