Patent ID: 6763719
Filing Date: 2004-07-20
Classification: G01P

Abstract:
An acceleration sensor, comprising:a mass portion provided in a center of the acceleration sensor and having a top surface; a thick frame surrounding the mass portion with a predetermined distance from the mass portion and having a top surface; a plurality of elastic support arms each extending from an edge of the top surface of the mass portion, bridging the top surface edge of the mass portion and an inside edge of the top surface of the thick frame and hanging the mass portion inside of the thick frame; two first strain gauges disposed on a top surface of each of the elastic support arms with a distance from each other along an elastic support arm extending, and extending in the direction of the elastic support arm extending; and two second strain gauges disposed on the top surface of the elastic support arms having the two first strain gauges and with a distance different from the first strain gauge distance between the two second strain gauges along the elastic support arms, and extending in the direction of the elastic support arm extending, the two first strain gauges detecting an acceleration in the direction of the elastic support arm extending and the two second strain gauges detecting an acceleration in the direction perpendicular to the top surface of the mass portion.