Sonic autofocus camera having variable sonic beamwidth

Details Sonic autofocus camera having variable sonic beamwidth Sonic autofocus camera having variable sonic beamwidth

1982-09-30

1984-04-03

Gellner, Michael L.

354401, 354403, G03B 310

Patent

active

044404824

ABSTRACT:
A photographic camera having a plurality of interchangeable, adjustable focus lenses and having a focus control system capable of focusing each such lens over a range of subject distances in response to a rangefinder derived signal is provided with a sonic ranging system that includes an ultrasonic, capacitance-type transducer having a multiple segment backplate whose sonic beam angle is automatically correlated to the field-of-view angle of the image forming lens by selecting a particular combination of backplate segments when or as a particular interchangeable lens is attached to the camera body.

REFERENCES:
patent: 3522764 (1970-08-01), Biber et al.
patent: 4081626 (1978-03-01), Muggli et al.
patent: 4103309 (1978-07-01), Massa
patent: 4199246 (1980-04-01), Muggli
"Condenser Transmitters and Microphones with Solid Dielectric for Airborne Ultrasonics", by W. Kuhl et al., in Acustica, vol. IV, 1954, pp. 519-532.

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