Patent ID: 7554340

Claim:
A capacitive sensor that has a fixed electrode and a movable electrode formed on a semiconductor layer, in which a detecting unit is structured that a portion of the fixed electrode and a portion of the movable electrode are opposed to each other keeping a gap therebetween, and that detects a predetermined physical quantity by detecting capacitance that varies according to a size of the gap, comprising an error compensating unit that, in an arrangement that another portion of the fixed electrode and another portion of the movable electrode are opposed to each other keeping another gap in a direction of a shift of the detecting unit, reduces a detection error of the capacitance due to a shift of the electrodes from each other in the detecting unit, by a change of capacitance according to a variation of the other gap caused by the shift, wherein the error compensating unit is arranged as another detecting unit, and each detecting unit outputs signals independently from the other.