Ultrasonic sandwich transducer with an astigmatic sonic lobe

Details Ultrasonic sandwich transducer with an astigmatic sonic lobe Ultrasonic sandwich transducer with an astigmatic sonic lobe

1990-10-29

1992-09-01

Budd, Mark O.

Electrical generator or motor structure

Non-dynamoelectric

Piezoelectric elements and devices

310334, 310335, 310345, H01L 4108

Patent

active

051441861

ABSTRACT:
In an ultrasonic sandwich transducer having an astigmatic sonic lobe, a small rectangular piezoceramic plate is operated on the fourth planar vibrational mode. To prevent the creation of secondary lobes that lead to spurious signals, damping elements are applied to the longitudinal ends of the ultrasonic sandwich transducer. These types of ultrasonic sandwich transducers find application, in ultrasonic proximity switches.

REFERENCES:
patent: 3359537 (1967-12-01), Geil et al.
patent: 3928777 (1975-12-01), Massa
patent: 3949348 (1976-04-01), Dorr
patent: 4190783 (1980-02-01), Massa
patent: 4316115 (1982-02-01), Wilson et al.
patent: 4409510 (1983-10-01), Assenza et al.
patent: 4571520 (1986-02-01), Saito et al.
Navy Technical Disclosure Bulletin, vol. 4, No. 4, Apr. 1979, pp. 25-28; Arlington, US; C. H. Jones et al.: "Sidelobe Suppressors".

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