Patent ID: 7111514

Claim:
An acceleration sensor comprising: an acceleration sensor element having a mass portion located in the center of the acceleration sensor element, a thick frame being at a distance from the mass portion and having a plurality of terminals on an 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, strain gauges formed on upper surfaces of the elastic support arms and lead wires connecting between the strain gauges and/or between the strain gauges and the terminals; the upper surface of the mass portion composed of: connection portions connecting the mass portion with each of the elastic support arms, wired areas having part of the lead wires on the wired areas and non-wired areas; and an upper regulation plate mounted with a first gap between the wired areas of the mass portion and a bottom surface of the upper regulation plate to cover the acceleration sensor element and fixed on the upper surface of the thick frame with adhesive put on the upper surface of the thick frame, wherein the upper regulation plate has a second gap between upper surfaces of the non-wired areas of the mass portion and the bottom surface of the upper regulation plate, the second gap separating the upper surfaces of the non-wired areas of the mass portion and the bottom surface of the upper regulation plate, where the separating is at a distance between the upper surfaces of the non-wired areas of the mass portion and the bottom surface of the upper regulation plate which is greater than the sum of (i) a length of the first gap plus (ii) a thickness of the lead wires plus (iii) 0.1 μm.