Electrical generator or motor structure – Non-dynamoelectric – Piezoelectric elements and devices
Patent
1992-07-31
1994-09-27
Dougherty, Thomas M.
Electrical generator or motor structure
Non-dynamoelectric
Piezoelectric elements and devices
310313B, 310334, 310358, H01L 4104, H01L 41193
Patent
active
053509617
ABSTRACT:
Devices are disclosed for controlling high frequency signals such as optic or electric signals by the generation of acoustic waves. The devices use certain bulk or surface-modified crystalline substrates which have a surface with a receiving area and an input interdigital transducer deposited on the signal receiving area of the substrate surface which is suitable for connection to a source of signal and for inverse piezoelectrically generating acoustic waves in the crystalline substrate. The crystal substrates are of a material having a piezoelectric-elastic dielectric matrix capable of the generation of acoustic waves and for bulk substrates, are of MTiOXO.sub.4 (where M is K, Rb, Tl, and/or NH.sub.4 and X is P and/or As) having mm2 symmetry. The receiving area of the surface-modified crystal substrates has alternating sections of crystalline material which are aligned and have a ferroelectric domain structure opposite to that of adjacent sections, and the IDT for said substrates is in contact with said alternating sections.
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Dougherty Thomas M.
E. I. Du Pont de Nemours and Company
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