Sonic autofocus camera having variable sonic beamwidth

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

1984-01-30

1984-12-25

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Signal transducers

179111R, 367105, H04R 1900

Patent

active

044908148

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
patent: 4081626 (1978-03-01), Muggli et al.
patent: 4103309 (1978-07-01), Massa
patent: 4199246 (1980-04-01), Muggli
patent: 4241611 (1980-12-01), Specht et al.
patent: 4242913 (1981-01-01), Mezrich et al.

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