Automatic focusing camera

Details Automatic focusing camera Automatic focusing camera

1981-05-04

1982-12-21

Perkey, William B.

354286, G03B 1322, G03B 1712

Patent

active

043646522

ABSTRACT:
An automatic focusing camera is provided with an ultrasonic distance measuring instrument capable of varying the directivity of an ultrasonic beam to be transmitted depending upon the angle of view of a photographic lens used. A plurality of circuit components one of which is selected so as to determine the oscillation frequency of an oscillator mounted in a camera body depending upon the angle of view of a photographic lens attached to the camera are mounted on the camera body, and a selecting means is mounted on the lens mount of a photographic lens at a position corresponding to the angle of view thereof so that when the photographic lens is attached to the camera body, its selecting means establishes an electrical connection of a predetermined one of said circuit components to said oscillator, whereby the latter oscillates at a predetermined frequency and consequently the ultrasonic beam transmitted has a predetermined directivity corresponding to the angle of view of the photographic lens.

REFERENCES:
patent: 4199246 (1980-04-01), Muggli

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