FLEXIBLE CIRCUIT BOARD BASED FORCE SENSOR

摘要

A flexible circuit board based force sensor is disclosed. A flexible circuit having a first metal pad and a second metal pad, the flexible circuit board is folded so that the first metal pad functioning as a top metal pad and the bottom metal pad functioning as a bottom metal pad. A force sensing material is configured in between the top metal pad and the bottom metal pad to form a force sensor. An electronic drawing system adopts the flexible circuit board based force sensor in an electronic pen for sensing pressures applied against the pen tip of the electronic pen.

主权项

1. An electronic drawing system, comprising:
an electronic pen comprising: a pen tip; a tip base, configured on bottom of the pen tip; a flexible circuit board, having a first metal pad and a second metal pad; the flexible circuit board is bent so that the first metal pad is configured as a top metal pad and the second metal pad is configured as a bottom metal pad facing the top metal pad; wherein the top metal pad is configured below the tip base; a force sensitive material, configured between the top metal pad and the bottom metal pad; when a force is applied against the pen tip, the force sensitive material is compressed, a corresponding force signal is generated; wherein the force signal is positively related to an amount of the force applied against the pen tip; and wherein the force sensitive material is selected from a group consisting of piezoresistive material and piezocapacitive material.