Electric/acoustic transducers and acoustic/electric transducers

Details Electric/acoustic transducers and acoustic/electric transducers Electric/acoustic transducers and acoustic/electric transducers

1990-03-22

1992-01-28

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310313B, 333155, H01L 4108

Patent

active

050846469

ABSTRACT:
The invention concerns electric/acoustic input transducers and acoustic/electric output transducers, in particular for a surface wave device, of the type comprising on a large face of a planar piezoelectric substrate: (i) two conductive input zones or output zones separated by a substrate band over which there extend respective parallel fingers which are interlaced according to a pattern chosen to form a row of fingers along this band, the general direction of the band being inclined to the direction of the fingers; and (ii) electric input means for applying high frequency signals between the zones so as to form sources of surface acoustic waves on the substrate or output means for extracting the signals detected by the device.
At least one of the two conductive input or output zones is subdivided into electrically separated sub-zones, while the electric input means comprise a distributor capable of separately energizing the conductive input zones and while the electric output means comprise a coupler capable of combining the electric signals coming from said output sub-zones.

REFERENCES:
patent: 3919669 (1975-11-01), Hartmann
patent: 3965444 (1976-06-01), Willingham et al.
patent: 4499393 (1985-02-01), Stokes et al.
patent: 4697115 (1987-09-01), Mitsutsuka
patent: 4947073 (1990-08-01), Stokes et al.

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