Patent ID: 7119552
Filing Date: 2006-10-10
Classification: G01L,G06F

Abstract:
1. A capacitance type sensor comprising: a substrate that provides an XY plane of an XYZ three-dimensional coordinate system; a detective member being opposed to the substrate; a conductive member disposed between the substrate and the detective member so as to be Z-axially displaceable in accordance with Z-axial displacement of the detective member; a capacitance element electrode formed on the substrate to cooperate with the conductive member to form a first capacitance element; and a reference electrode formed on the substrate to cooperate with the conductive member to form a second capacitance element, and kept at a ground potential or another fixed potential, wherein the first and second capacitance elements are connected in series in relation to a signal input to the capacitance element electrode, and displacement of the detective member can be detected on the basis of detection of a change in the capacitance value of the first capacitance element caused by a change in the interval between the conductive member and the capacitance element electrode; and wherein the capacitance type sensor comprises two capacitance element electrodes in a pair, and after each of analog signals corresponding to signals respectively input to a circuit including one of the capacitance element electrodes and a circuit including the other of the capacitance element electrodes, has passed the respective signal processing circuit having hysteretic characteristics and the analog signals are input to a logic element, an output signal is output from the logic element.