公开(公告)号：US20150296607A1

公开(公告)日：2015-10-15

申请号：US14251227

申请日：2014-04-11

Applicant: APPLE INC.

Inventor： Henry H. Yang ,  Matthew E. Last ,  Tongbi T. Jiang

IPC: H05K1/02 ,  H05K1/09 ,  H05K1/03 ,  G01B7/16 ,  H05K1/18

CPC classification number: H05K1/028 ,  G01L1/205 ,  G01L1/2287 ,  G06F3/00 ,  G06K9/00006 ,  H05K1/167 ,  H05K2201/0154 ,  H05K2201/0391 ,  H05K2201/09263 ,  H05K2201/10151

Abstract: An electronic device may be provided with a flexible printed circuit. The flexible printed circuit may have layers of metal and dielectric. Strain gauge resistors may be formed from a strain gauge metal such as constantan. The strain gauge metal may be formed within the flexible printed circuit layers. A strain gauge may include strain gauge circuitry coupled to a strain gauge bridge circuit. Strain gauge resistors for the bridge circuit may be formed from traces that follow parallel meandering paths in the flexible printed circuit layers. A component such as a fingerprint sensor may overlap the strain gauge resistors. Strain gauge resistors may be formed in different overlapping metal layers in the flexible printed circuit layers or may be formed from the same metal layer. Electroplating techniques may be used to form metal traces to which solder balls or wire bonds are coupled.

Abstract translation: 电子设备可以设置有柔性印刷电路。 柔性印刷电路可以具有金属和电介质层。 应变计电阻器可以由诸如康铜的应变计金属形成。 应变计金属可以形成在柔性印刷电路层内。 应变仪可以包括耦合到应变仪桥接电路的应变仪电路。 用于桥接电路的应变计电阻器可以由沿着柔性印刷电路层中的平行弯曲路径的迹线形成。 诸如指纹传感器的组件可能与应变计电阻重叠。 应变计电阻器可以形成在柔性印刷电路层中的不同重叠的金属层中，或者可以由相同的金属层形成。 可以使用电镀技术来形成连接焊球或引线键的金属迹线。