Method for providing a desired sound field as well as an ultraso

Details Method for providing a desired sound field as well as an ultraso Method for providing a desired sound field as well as an ultraso

1988-12-29

1990-03-27

Echols, P. W.

Metal working

Piezoelectric device making

29594, 310312, H04R 1700

Patent

active

049108387

ABSTRACT:
The present invention provides a substantially gauss-shaped sound field by means of an ultrasonic transducer, the potential on one side of the transducer being varied continuously by means of a thick-film electrode applied in a uniform or varying thickness. The thick-film can be a resistance paste or a conductive paste applicable in different thicknesses onto selected portions of the surface in question. The resistance paste can for instance be trimmed to different resistance values on selected portions of the surface. Such a technique makes it possible to alter the distribution of the potential so as to vary the distribution of the pressure in the sound field in such a manner that for instance a substantially gauss-shaped sound field is obtained.

REFERENCES:
patent: 2956184 (1960-10-01), Pollack
patent: 4452084 (1984-06-01), Taenzer
patent: 4460841 (1984-07-01), Smith et al.
patent: 4518889 (1985-05-01), Thoen
patent: 4639391 (1987-01-01), Kuo
R. A. Burrier et al., Circularly Symmetric Gaussian Field Transducer with Equal Impedance and Equal Voltage Electrode Design, 1983, Ultrasonics Symposium, pp. 570-572.
G. H. Harrison et al., Ultrasonic Transducer Design for Uniform Insonation in Biomedical Ultrasound, 1985 Ultrasonics Symposium, pp. 630-633.

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