Patent ID: 9625487
Date: 2017-04-18
CPC Classifications: B81C,G01P

Claim:
1. A method for preparing a capacitive acceleration sensor with a bending elastic beam, at least including: 1) performing etching at two surfaces of a SOI silicon substrate with a double device layer based on an anisotropic etching method, causing the two surfaces to be concave respectively; 2) forming a plurality of anti-overloading bumps at recesses on the two surfaces based on photolithography and the anisotropic etching method, respectively; 3) further forming damping grooves at the two surfaces of the structure on which the anti-overloading bumps have been formed based on photolithography and the anisotropic etching method, respectively; 4) performing etching on the two surfaces of the structure on which the damping grooves have been formed, respectively, based on photolithography and dry etching, and etching self-stops at a buried oxide layer, whereby on the two surfaces is formed a structure where the frame and the seismic mass are connected to the bending elastic beam, respectively, and the anti-overloading bumps and the damping grooves are caused to be positioned on the corresponding seismic mass, and the bending elastic beams of the two surfaces are staggered distributed and are not overlapped with each other in space; 5) releasing the bending elastic beam and the seismic mass based on photolithography, dry etching and the anisotropic etching method; 6) simultaneously bonding the first electrode structural layer, the structure comprising the released bending elastic beam and the seismic mass, and the second electrode structural layer based on a bonding process; 7) forming electrode lead via-holes at the first electrode structural layer and the second electrode structural layer of the bonded structure based on infrared aligning; and 8) preparing an electrode on the structure on which the via-holes have been formed.