Force sensor, force detection system and force detection program

A force detection system comprising:

• a force sensor equipped with a displacement unit that displaces when a force is applied, at least one first sensor unit that generates a first output by detecting the displacement of said displacement unit as change of capacitance;
• and a second sensor unit that is annexed to said first sensor unit and generates a second output which is independent of said first output and rises steeply from said first output and shifts to a saturated state ahead of said first output by detecting the displacement of said displacement unit of the same direction that said first sensor unit detects as change of capacitance;
• and
• a processing unit that obtains said first output using said second output of said force sensor as a reference information for said first output.

A method for detecting a force comprises the following steps:

• obtaining a first output from a first sensor unit provided in a displacement unit that displaces in response to the application of the force;
• obtaining a second output which is independent of said first output and rises steeply from said first output and shifts to a saturated state ahead of said first output as change of capacitance from a second sensor unit provided in said displacement unit and detecting the displacement of said displacement unit of the same direction that said first sensor unit detects as change of capacitance;
• extracting time information representing a level period that exceeds a specified level from said second output;
• and
• obtaining said first output referencing said time information.