Shunt Mode FSR vs. Thru Mode FSR

About FSR

Force Sensitive Resistor (FSR) also known as Force Sensing Resistor, is an electronic sensing element that outputs resistance values when force or pressure is applied. The greater pressure, the lower resistance outputs. Its construction is made of flexible polymer sheets (PET) and screen-printed conductive materials. It is ultra-thin, flexible, and more importantly, it is customizable. Asides from dimension and sensor configuration, internal specification is also tunable in accordance with project need. 

 There are two types of FSR – Shunt Mode FSR and Thru Mode FSR. Both type’s functionality is identical, but with different construction method and pressure. 

Shunt mode FSR

Shunt Mode Force Sensitive Resistor is for wide pressure range sensing. The resistance varies when great pressure is applied. It is constructed with two layers of PET film. The first layer is printed with conductive silver in the shape of interdigitated claws and the second layer is printed with resistive formulated carbon. Shunt mode FSRs generate resistance when one layer contact another. 

Example of sensor applications:

Electronic music instruments

Integrated Force Sensitive Resistor in relation with sound to imitate music keys and pads.

Inventory control

Integrated Force Sensitive Resistor for real-time inventory monitoring and displacement

Occupancy detection

Integrated Force Sensitive Resistor on sit or floor to detect pressure from occupancy

Thru mode FSR

Thru Mode Force Sensitive Resistor is for light pressure precise sensing.  It is constructed with two layers of PET film. Both layers are printed with conductive silver first then resistive carbon on top of it. Comparing to Shunt mode FSR with interdigitated silver claws, Thru FSR printed both materials that covers the whole sensing area. Thru mode FSRs generate resistance when one layer contact another. 

Example of sensor applications:

Electronics stylus

Integrated Force Sensitive Resistor to facilitate relations between user writing pressure and keystroke output

Robotic Arm

Integrated Force Sensitive Resistor to monitor and control the pressure point of robotic arm

Integrated Force Sensitive Resistor to protect against robotic arm impact

Machine 

Integrated Force Sensitive Resistor to monitor moving part counts and assist with maintenance

Conclusion

Smart and IOT devices are thriving in the world we live in today, and integrated sensors play an important role in these devices.  According to market status, the sensor industry will grow at the rate of 10% CAGR from 2021 to 2028.  The needs for small, flexible, lightweight, and cost-effective sensor integrated solution are more apparent than ever.  We believe that Force Sensitive Resistor (FSR), which focuses on pressure sensing can meet these needs.  Its applications are limitless and across industries that include IOT, medical, automation, logistics, industrial, and much more.  

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分流模式 FSR 與直通模式 FSR關於FSR 力敏電阻器（FSR）也稱為力敏電阻器，是一種在施加力或壓力時輸出電阻值的電子傳感元件。壓力越大，輸出阻力越低。其結構由柔性聚合物片材 (PET) 和絲網印刷導電材料製成。它超薄、靈活，更重要的是，它是可定制的。除了尺寸和傳感器配置外，內部規格也可根據項目需要進行調整。 FSR 有兩種類型——分流模式 FSR 和直通模式 FSR。兩種類型的功能相同，但施工方法和壓力不同。 分流模式 FSR 分流模式力敏電阻器用於寬壓力範圍感測。當施加很大的壓力時，阻力會發生變化。它由兩層 PET 薄膜構成。第一層印有呈叉指狀的導電銀，第二層印有電阻配方的碳。當一層接觸另一層時，並聯模式 FSR 會產生電阻。 傳感器應用示例： 電子樂器 與聲音相關的集成力敏電阻器以模仿音樂鍵和打擊墊。 庫存控制 用於實時庫存監控和位移的集成力敏電阻器 佔用檢測 坐在或地板上的集成力敏電阻可檢測佔用壓力 直通模式 FSR 直通模式力敏電阻器用於輕壓精確傳感。它由兩層 PET 薄膜構成。兩層都先用導電銀印刷，然後再在上面印刷電阻碳。與採用叉指式銀爪的分流模式 FSR 相比，Thru FSR 打印覆蓋整個傳感區域的兩種材料。當一層接觸另一層時，直通模式 FSR 會產生電阻。 傳感器應用示例： 電子筆 集成力敏電阻器，以促進用戶書寫壓力和擊鍵輸出之間的關係 機械臂集成力敏電阻監測和控制機械臂的壓力點集成力敏電阻器可防止機械臂撞擊 機器 集成力敏電阻器可監控運動部件數量並協助維護 結論 智能和物聯網設備在我們今天生活的世界中蓬勃發展，集成傳感器在這些設備中發揮著重要作用。根據市場現狀，傳感器行業在2021年至2028年間將以10%的複合年增長率增長。對小型、靈活、輕便、高性價比的傳感器集成解決方案的需求比以往任何時候都更加明顯。我們相信專注於壓力傳感的力敏電阻（FSR）可以滿足這些需求。它的應用是無限的，跨行業，包括物聯網、醫療、自動化、物流、工業等等。