ULTRASOUND DEVICE, IMPEDANCE MATCHING LAYER, AND ELECTROSTATIC DRIVE DEVICE

An ultrasonic device is provided for transmitting ultrasonic waves. The ultrasonic device comprises an electrostatic drive device and an impedance matching layer. The electrostatic drive device includes a first electrode and a second electrode. The first electrode is a drive membrane and is disposed...

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Bibliographische Detailangaben
Hauptverfasser:	KAMIGAKI, Takaaki, SHINODA, Hiroyuki, NINOMIYA, Yuki
Format:	Patent
Sprache:	eng
Schlagworte:	ANALOGOUS ARRANGEMENTS USING OTHER WAVES DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION ORRERADIATION OF RADIO WAVES MEASURING PHYSICS RADIO DIRECTION-FINDING RADIO NAVIGATION TESTING
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Beschreibung
Zusammenfassung:	An ultrasonic device is provided for transmitting ultrasonic waves. The ultrasonic device comprises an electrostatic drive device and an impedance matching layer. The electrostatic drive device includes a first electrode and a second electrode. The first electrode is a drive membrane and is disposed with tension applied at a position facing the second electrode. The second electrode has a through hole. At least one of the first electrode and the second electrode is a laminated membrane in which a plurality of materials with different conductivities are laminated. The impedance matching layer includes a matching membrane and gas. The matching membrane has a resonance loss equal to or less than transmitted acoustic power, and is disposed with tension applied at a position facing the first electrode. The gas is sealed between the matching membrane and the first electrode.