Patent ID: 7847359
Filing Date: 2010-12-07
Classification: B81B,H04R

Abstract:
1. A MEMS device comprising: a semiconductor substrate; a first insulating film formed between the semiconductor substrate and a first electrode; a vibrating film formed on the first insulating film and having the first electrode; a fixed film formed above the vibrating film with an air gap being interposed between the vibrating film and the fixed film, the fixed film having a second electrode; and a second insulating film provided between the semiconductor substrate and a portion of the fixed film, the second insulating film having an opening that exposes a part of the first electrode, wherein: the semiconductor substrate has a region containing N-type majority carriers, the semiconductor substrate contacts the first insulating film, the region containing N-type majority carriers is provided in at least a portion of the semiconductor substrate where the semiconductor substrate contacts the first insulating film, a concentration of N-type majority carriers in the portion of the semiconductor substrate where the semiconductor substrate contacts the first insulating film is higher than a concentration of N-type majority carriers in other portions of the semiconductor substrate, and the portion of the semiconductor substrate which is in contact with the first insulating film is located in a region directly under the opening.