Patent ID: 6892578

Claim:
An acceleration sensor comprising: an acceleration sensor chip having a mass portion located in a center of the acceleration sensor chip, a thick frame surrounding the mass portion and being at a distance from the mass portion and having a plurality of recesses on an upper surface of the thick frame, each of the recesses having a bottom surface under the upper surface of the thick frame, a plurality of elastic support arms bridging an upper surface of the mass portion and the upper surface of the thick frame, and strain gauges formed on upper surfaces of the elastic support arms; and an upper regulation plate mounted with a predetermined gap between the upper surface of the mass portion and a lower surface of the upper regulation plate to cover the acceleration sensor chip and fixed on the upper surface of the thick frame by an adhesive paste disposed in the plurality of the recesses on the upper surface of the thick frame, wherein the paste is adhesive mixed with hard plastic balls of diameters larger than the predetermined gap between the upper surface of the mass portion and the lower surface of the upper regulation plate.