Patent ID: 6716253
Filing Date: 2004-04-06
Classification: B81B,G01L,G01P

Abstract:
A force detector comprising:a stable member fixed to a detector casing; a central member locating adjacent to said stable member with a space; an intermediate member locating around said central member and connected to said central member; a peripheral member locating around said intermediate member and fixing said intermediate member to said stable member; a first fixed electrode and a second fixed electrode operatively on said stable member; and a first displacement electrode and a second displacement electrode operatively on said central member; wherein said intermediate member has flexibility to resiliently support said central member so that said central member moves when force is applied; wherein said first fixed electrode is opposite to said first displacement electrode to constitute a first capacitance element and said second fixed electrode is opposite to said second displacement electrode to constitute a second capacitance element; and wherein a first force component which makes an electrode distance of said first capacitance element smaller than an electrode distance of said second capacitance element and a second force component which makes said electrode distance of said second capacitance element smaller than said electrode distance of said first capacitance element are detected by a difference between electrostatic capacitance values of said first and second capacitance elements.