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什麼是軟性電路板?

軟性電路板(亦稱為軟板或 FPC)是一種可彎曲、折疊與扭轉且不會斷裂的印刷電路板。有別於硬板,軟性電路板專為適應狹窄空間與動態環境而設計,使其成為輕巧型電子裝置的理想選擇。

軟性電路板與硬板的差異

硬板採用 FR4 基材,這使其質地堅硬,較難適應狹窄空間。相比之下,軟性電路板使用聚醯亞胺(Polyimide)基材,讓電路板能彎曲與扭轉且不會受損。導電銅層負責在基材上傳輸訊號,而保護性的覆蓋膜或塗層則確保了耐用度。歸功於此種撓曲性,FPC 不僅節省空間、耐震性更佳,更能實現硬板無法達成的 3D 封裝解決方案。

flexible pcb cross section with components

軟性電路板的結構與特性

軟性電路板的結構採用輕薄且可彎曲的基材(如聚醯亞胺 PI 或 PET),這使其具備優異的機械撓曲性與耐熱性。銅箔經壓合於基材上以形成導電線路,並透過覆蓋膜或防焊層保護電路。視應用需求而定,可在特定區域加入補強板以強化連接器或組裝點的支撐力,且不影響整體的撓曲特性。

軟性電路板兼具機構適應性與電性可靠度。它們可彎曲、折疊或扭轉,以適應體積輕巧或形狀不規則的裝置,並同時維持穩定的電性效能。

關鍵特性包括:
  • 高撓曲性 - 可承受反覆彎折而不受損。
  • 輕量與薄型 - 節省空間並減輕整體裝置重量。
  • 耐用性 - 可抵抗震動、熱應力與動態位移。
  • 設計彈性 - 支援複雜佈局,並減少連接器與線材的使用。

軟性電路板的優勢

節省空間與減輕重量

軟性電路板極為輕薄。在空間受限的系統中,它能降低對笨重線材的需求。歸功於此種撓曲性,讓我們得以設計出體積輕巧的裝置。

嚴苛環境下的耐用性與撓曲性

軟性電路板具備優異的耐彎折性,能提升整體的彎折比率與彎折頻率。歸功於其良好的熱穩定性,FPC 在承受機械應力與震動的應用環境中表現優異。

提升訊號完整性

由於厚度縮減,層間距隨之縮小,接地迴流路徑也變短。這將降低整體串音,並提升高速設計中的訊號完整性。

軟性電路板設計考量

key considerations in flexible pcb design

彎折半徑與層數

  • 最小彎折半徑決定軟性電路板在不產生裂紋或分層的前提下,可彎曲的緊密程度。此參數取決於層數和材料類型兩者。通常而言,越多層會降低撓曲性,因此需要經常彎折的設計應盡量減少層數。

材料選擇

線路佈線與焊墊設計

軟性電路板的常見應用

消費性電子產品

  • 軟性電路板廣泛應用於智慧型手機、穿戴式裝置與筆記型電腦,以節省空間並實現超薄型設計。透過允許零組件在更狹窄的空間內進行連接,FPC 使輕巧、體積精簡的裝置成為可能。

醫療裝置

汽車電子

航太與航空

jlcpcb flexible pcb applications in consumer electronics

JLCPCB 軟性電路板製造能力

功能
製程能力
最小尺寸

無限制。若尺寸 < 20×20mm,建議使用拼板出貨。

最大尺寸

標準規格:234 × 490mm

絕對限制:250 × 600mm 需帶邊緣軌

尺寸公差

±0.1mm/±0.05mm (需額外收費)

覆蓋層顏色

黃色 / 黑色 / 白色 / 透明

表面處理

化學鍍鎳金。厚度:1u" / 2u"

最小的過孔尺寸/直徑

①標準規格:0.15mm/0.35mm

②極限:0.10mm/0.3mm(需額外收費)

最小有銅槽

0.50mm

最小無銅槽

無限制

PTH 孔環

≥ 0.25 mm。絕對限制:0.18mm

最小線寬/線距

① 12µm (1/3oz) 銅箔:3/3mil (絕對限制 2/2mil)

② 18µm (0.5oz) 銅箔:3.5/3.5mil

③ 35µm (1oz) 銅箔:4/4mil

補強板材料

PI(0.1mm, 0.15mm, 0.20mm, 0.225mm, 0.25mm)

FR4(0.1mm, 0.2mm, 0.4mm, 0.6mm, 0.8mm, 1.0mm, 1.2mm, 1.6mm)

不鏽鋼(0.1mm, 0.2mm, 0.3mm)

3M 膠帶(tesa8854, 3M9077, 3M468)

為何 JLCPCB 是首選的軟性電路板製造商?

軟性材料選擇

從超薄的 25µm 基材到抗撕裂的 50µm 基材,再到透明 PET (85% 透光率) 及先進的 4 層板疊構,JLCPCB 可滿足各種設計需求。

值得信賴的精準度

JLCPCB 透過雷射直接成像曝光(LDI exposure)與乾膜製程,可實現 2/2 mil 線寬/線距,且焊墊無偏差。雷射切割則能實現任何形狀的切割,公差可達 ±0.05mm。

可靠品質與耐用性

JLCPCB 採用無膠基材,並提供多種補強板(Stiffener)選項,以確保優異的彎折性能與長期的穩定性。

具備成本效益且快速

我們提供具成本效益的工廠直供價格,結合可靠的 4 至 5 天交期,為您帶來成本、速度與可靠度的最佳平衡。

如何在 3 個簡單步驟內訂購 JLCPCB 軟性電路板

jlcpcb advanced pcb manufacturing and assembly services

軟性電路板常見問題

軟性電路板使用哪些材料?

聚醯亞胺與聚酯薄膜是軟性電路板最常見的基材。可以根據成本和熱穩定性來選擇這兩種材料。

軟性電路板可以彎折多少次?

軟性電路板的最小彎折半徑是多少?

軟性電路板比硬板更昂貴嗎?

何時應選用軟性電路板?

軟性電路板有哪些缺點?

軟性電路板有多少層?

客戶對 JLCPCB 軟性電路板的評價

57****6A
Flex
57****6A July 9, 2026
柔性, 2 layer, Yellow, ENIG, PCB樣板
I recently used JLCPCB for a prototype PCB order and I have to say - I am thoroughly impressed! From start to finish, the experience was smooth, professional, and exceeded my expectations. Ordering Process (5/5): The website is incredibly user-friendly. Uploading my Gerber files was straightforward, and the instant quote feature gave me immediate clarity on pricing. The order tracking system kept me informed at every stage of production. Quality (5/5): The boards arrived perfectly packaged with no damage. The PCB quality is exceptional - clean solder mask, precise drilling, sharp silkscreen, and perfect pad alignment. The 2-layer FR-4 boards met all my specifications exactly as requested. Speed (5/5): I selected standard shipping and still received my boards much faster than anticipated. The manufacturing lead time was exactly as promised, and shipping was efficient. Pricing (5/5): Unbeatable value! The cost was significantly lower than other services I've tried, without any compromise on quality. The transparent pricing with no hidden fees is much appreciated. Customer Service (4.5/5): While I didn't need to contact support (everything went smoothly), their comprehensive documentation and responsive order updates gave me confidence throughout the process. Overall Experience: JLCPCB has become my go-to PCB manufacturer. They've managed to combine professional quality, competitive pricing, and reliable service - a rare trifecta in this industry. Whether you're a hobbyist working on a personal project or a professional needing quick-turn prototypes, I can't recommend JLCPCB enough. Final Verdict: Professional quality at hobbyist-friendly prices with enterprise-level reliability. I'll definitely be using their services for all my future PCB needs!
39****0A
Flex
39****0A June 21, 2026
柔性, 2 layer, White, ENIG, PCB樣板
This is an early prototype for a keyboard wiring harness. The silkscreen and soldermask quality are excellent, gold fingers and stiffener came out exactly to spec, edge cuts perfect. Will continue to use JLC as my supplier of choice.
48****7A
Flex
48****7A June 20, 2026
柔性, 2 layer, Yellow, ENIG, PCB樣板
Another five-star review for JLCPCB, this time on their flexible PCBs. Ordered using KiCad instead of their editor and still turned out perfect. There’s a small learning curve, but their support is excellent. I keep coming back for a reason. Highly recommended.
12*****6A
Flex
12*****6A June 20, 2026
柔性, 2 layer, Yellow, ENIG, PCB樣板
Board quality is above expectations, i was surprised. Flexible design, and does not break. Have not seen any continuity issues and the dimensions of the FPC all check out as well. All in all a great experience, i would recommend it and i will be buying more boards here in the future.

使用 JLCPCB 解決方案,開啟更多無限可能

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