Electrostatic transducer having narrowed directional characteris

Details Electrostatic transducer having narrowed directional characteris Electrostatic transducer having narrowed directional characteris

1976-11-12

1978-03-28

Stellar, George G.

H04R 1900

Patent

active

040816265

ABSTRACT:
A Sell-type transducer for use in an ultrasonic ranging system for a camera has a hollow base containing a floating backplate having a grooved surface in contact with the non-metallic surface of a metallized plastic diaphragm stretched across the base. A spring arrangement urges the floating backplate into engagement with the diaphragm to maintain tension thereon in the event long-term plastic flow occurs in the diaphragm. Improved side lobe suppression is achieved by progressively decreasing the depth of the grooves as the periphery is approached. Further, for repeatability, the crests of the grooves define a convex surface.

REFERENCES:
patent: RE28420 (1975-05-01), Murphy
patent: 2910539 (1959-10-01), Hartsfield
patent: 3118979 (1964-01-01), Sessler et al.
patent: 3430146 (1969-02-01), Chua
patent: 3814864 (1974-06-01), Victoreen
patent: 3816671 (1974-06-01), Fraim et al.
patent: 3958662 (1976-05-01), Brzezinski et al.
AWA Technical Review, Dec. 1973, vol. 15, No. 2, pp. 53-64, "Application of Electreis to Electro-Acoustic Transducers", R. E. Collins.

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