Patent ID: 6766690
Filing Date: 2004-07-27
Classification: G01P

Abstract:
An acceleration sensor comprising:a sensing element; and a supporting member for supporting the sensing element at one end, both ends, or a central portion in a longitudinal direction of the sensing element; wherein the sensing element includes at least four laminated piezoelectric layers, each of the at least four laminated piezoelectric layers including piezoelectric ceramic, the at least four piezoelectric layers include a pair of first layers positioned at a center in a thickness direction of the sensing element and a pair of second layers sandwiching the pair of first layers, electrodes are provided at the center in the thickness direction of the sensing element, between the pair of first layers and the pair of second layers, and on outer surfaces of the pair of second layers, cells formed by the first and second layers located on the same side with respect to the center in the thickness direction are electrically connected in parallel, the pair of first layers have substantially the same thickness and the pair of second layers have substantially the same thickness, and a ratio of the thickness of each first layer to the total thickness of each first and second layer is about 62% to about 76%.