Range finding device for cameras

Details Range finding device for cameras Range finding device for cameras

1988-04-18

1991-12-03

Perkey, W. B.

354412, 354413, 3541271, G03B 300, G03B 1318

Patent

active

050703528

ABSTRACT:
A range finding device used on an automatic focusing camera comprises a plurality of light receiving photoelectric elements for receiving light reflected from subjects at different distances in the field each of which provides a subject distance signal. A subject brightness detecting device provides brightness information as to the subject, and a distance information providing device provides distance information based on the distance signals. A data table carries data as to a plurality of lens positions predetermined according to combinations of various subject distances and subject brightness. Based on combinations of information as to the subject brightness and subject distance, any of a plurality of lens positions is selected. To the selected lens position the taking lens of the camera is adjusted so as to include the subject within the depth of field of the taking lens.

REFERENCES:
patent: 4336987 (1982-06-01), Shenk
patent: 4812872 (1989-03-01), Desormeaux
patent: 4827303 (1989-05-01), Tsuboi

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