Is a
Patent attributes
Patent Jurisdiction
Patent Number
Patent Inventor Names
Katsuhiro Wakabayashi0
Hideo Adachi0
Date of Patent
August 9, 2011
0Patent Application Number
124225040
Date Filed
April 13, 2009
0Patent Primary Examiner
Patent abstract
This invention includes a first electrode which is fixed on a base, a vibration film which is disposed to oppose the first electrode with an air and vacuum portion between the vibration film and the first electrode, a second electrode which is supported by the vibration film and is connected to a predetermined potential, a ferroelectric which is electrically connected to the first electrode, and a driving portion that applies, to the first electrode, a driving signal which is a monopulse voltage signal and whose polarity is reversed every time the driving signal is outputted.
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