Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1997-01-29
1998-02-10
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, 310313D, 364821, H03H 9175
Patent
active
057172749
ABSTRACT:
A surface acoustic wave device includes a piezoelectric substrate, a wave guide path provided on the piezoelectric substrate and an interdigital transducer for exciting a surface acoustic wave. The interdigital transducer is provided with plural portions of mutually different pitches of the electrode finger, respectively corresponding to different frequencies. The portions are parallelly arranged along a direction perpendicular to the propagation direction of the surface acoustic wave. The surface acoustic wave generated by the interdigital transducer is entered in concentrated manner into the wave guide path.
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Egara Koichi
Eguchi Tadashi
Hachisu Takahiro
Koyama Akihiro
Mochizuki Norihiro
Canon Kabushiki Kaisha
Dougherty Thomas M.
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