Patent ID: 7152485

Claim:
An acceleration detector for detecting an acceleration component along a detection axis, said detector comprising: a fixed body and a displacement body, said displacement body being resiliently supported by said fixed body so that said displacement body is displaced with respect to said fixed body in a direction of said detection axis when acceleration is applied, a first capacitance element including a first fixed electrode fixed to said fixed body and a first displacement electrode fixed to said displacement body, a second capacitance element including a second fixed electrode fixed to said fixed body and a second displacement electrode fixed to said displacement body, and an output unit for outputting information indicating an acceleration component along said detection axis, wherein an electrode distance of said first capacitance element is decreased and an electrode distance of said second capacitance element is increased when said displacement body is displaced in a positive direction along said detection axis and the electrode distance of said first capacitance element is increased and the electrode distance of said second capacitance element is decreased when said displacement body is displaced in a negative direction along said detection axis, wherein said output unit outputs an acceleration component along said detection axis based on a difference between a capacitance value of said first capacitance element and a capacitance value of said second capacitance element, and wherein said fixed body and said displacement body are made of silicon.