Patent ID: 7299695

Claim:
An acceleration sensor comprising: a weight; a vibrator for supporting the weight at the center of gravity thereof, wherein the vibrator has such a cut angle that the piezoelectric constant in the longitudinal direction of the weight is zero and the piezoelectric constant in the thickness direction of the weight is also zero and for detecting an in-plane acceleration, the vibrator being positioned in a center of the weight in a longitudinal direction of the weight such that a center of rotation being located at a position further out than the vibrator in the longitudinal direction; a first circuit that adds up outputs generated from two regions formed by dividing a surface of the vibrator into two in the longitudinal direction of the weight and provides output detection signals corresponding to translational acceleration; and a second circuit that outputs the difference between the outputs and provides output detection signals correspond to angular acceleration, and wherein the weight having a size greater than that of the vibrator in the longitudinal direction, and wherein a sense signal based on the in-plane angular acceleration being output across detection electrodes provided on the vibrator.