Automatic focusing system for a photographic camera

Details Automatic focusing system for a photographic camera Automatic focusing system for a photographic camera

1985-09-24

1987-01-27

Perkey, William B.

G03B 300

Patent

active

046391100

ABSTRACT:
The application describes an automatic focusing system for photographic cameras. The system functions by means of an infrared light source and an infrared detector. The infrared radiation is focused as a function of object distance in such a manner on the detector that this detector is divided into two detector segments each of which supplies a partial current of which the ratio depends directly on the object distance. The detector is followed by an electronic computing circuit which sets the objective as a function of a preselection implemented by a switch to one of the following modes of operation:

REFERENCES:
patent: 4362372 (1982-12-01), Kiesel
patent: 4470681 (1984-09-01), Johnson
patent: 4571048 (1986-02-01), Sugawara

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