Patent ID: 6251698
Filing Date: 2001-06-26
Classification: B81B,B81C,G01P

Abstract:
Process for micromachining a beam of a microsensor having at least two plates, at least the first of which is in micromachined silicon, comprising the steps of:micromachining the silicon on the first plate to produce a beam having a thickness equal to a desired final thickness, and a width greater than a desired final width, the beam being covered on an upper face of the beam by a mask defining the desired final width;assembling the at least two plates together;oxidizing the upper face and a lower face of the beam in order to cover the upper and lower faces with a thin protective layer;removing the thin protective layer on the upper face, by vertical directional etching, without removing the mask already present;etching the silicon in an area of the upper face exposed by the preceding removing step until an entire part of the beam not protected by the mask is eliminated and the beam having the desired final width is thus formed.