Patent ID: 7855095

Claim:
A method of fabricating an ultra-small condenser microphone, comprising the steps of: (a) forming a plurality of ultra-small condenser microphones, each of the ultra-small condenser microphones including a semiconductor substrate, and a fixed electrode arranged opposite a vibration electrode via a space and a dielectric film arranged between the fixed and vibration electrodes, the fixed electrode and the vibration electrode being disposed on the semiconductor substrate; (b) after the step (a), sticking a sheet on a first surface of the semiconductor substrate, the first surface being opposite to a second surface on which the vibration electrode is formed; (c) after the step (b), disposing the ultra-small condenser microphone facing a tip of a needle discharge electrode; (d) after the step (c), performing electretization for fixing charges in the dielectric film by irradiating each dielectric film arranged between each fixed electrode and each vibration electrode provided in the plurality of the ultra-small condenser microphones with ions generated from the discharge electrode in a state that a predetermined potential difference is given between the fixed electrode and the vibration electrode in each ultra-small condenser microphones; and (e) after the step (d), separating the semiconductor substrate stuck on the sheet into individual ultra-small condenser microphone pieces.