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. |