Patent ID: 8216870

Claim:
A method of manufacturing a mechanical quantity sensor, comprising: providing a semiconductor substrate, the semiconductor substrate comprising: a first layer made of an impurity-containing silicon; a second layer made of an insulating material; and a third layer made of an impurity-containing silicon; forming a first structure by etching the first layer of the semiconductor substrate, the first structure comprises: a fixed portion with an opening, a block upper layer portion disposed in the opening and having conductivity, a displaceable portion disposed in the opening and displaceable relative to the fixed portion, and a connection portion connecting the fixed portion and the displaceable portion; stacking, on the first structure, a first base by joining the first base to the fixed portion via anodic bonding at a temperature of 300 Celsius degree or higher, wherein: the first base comprises a glass material, and the first base has a first driving electrode which: applies stack-direction vibration to the displaceable portion, is disposed on a surface facing the displaceable portion, and is made of a conductive material containing Al and Nd; forming a second structure by etching the third layer, the second structure comprising: a weight portion which is joined to the displaceable portion, a pedestal which surrounds the weight portion and is joined to the fixed portion, and a block lower layer portion surrounded by the pedestal and having conductivity; and stacking, on the second structure, a second base by joining the second base to the pedestal via anodic bonding at a temperature of 300 Celsius degree or higher, wherein: the second base comprises a glass material, and the second base has a second driving electrode which: applies stack-direction vibration to the displaceable portion, is disposed on a surface facing the weight portion, and is made of the conducive material.