Patent ID: 9476906
Filing Date: 2016-10-25
CPC Classification: B32B,G01P

Claim Text:
1. A method for preparing a capacitive acceleration sensor with an “H”-shaped beam, wherein said method for preparing the capacitive acceleration sensor of the “H”-shaped beam at least including: 1) performing etching at two surfaces of an SOI silicon substrate having 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 where 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 where the damping grooves have been formed based on photolithography and dry etching, and etching self-stops at a buried oxide layer, respectively, whereby on the two surfaces is formed a structure where the frame and the seismic mass are connected to the “H”-shaped elastic beam, respectively, and the anti-overloading bumps and the damping grooves are caused to be located on the corresponding seismic mass, the “H”-shaped elastic beam and the bulk silicon layer of the oxygen containing silicon substrate satisfy the requirements therebetween: a and c are width of the “H”-shaped elastic beam, respectively, b is a gap between the two beams, d is a connection width of the joint between the beams and the seismic mass, and his the thickness of the bulk silicon layer; 5) releasing the “H”-shaped 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 “H”-shaped 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; 8) preparing electrodes on the structure on which via holes have been formed.