Photoelectric rangefinder

Details Photoelectric rangefinder Photoelectric rangefinder

1978-10-11

1980-06-24

Gellner, Michael L.

350163SF, 354 31, 354 59, 354 60L, G03B 310, G03B 708

Patent

active

042092418

ABSTRACT:
A photoelectric rangefinder for use in a photographic camera for automatically focusing an image of a target object on a predetermined image plane. The system utilizes an electro-optical spatial filter having at least two photoresponsive elements to find the difference in phase between output signals from the respective photoresponsive elements. A signal indicative of the difference in phase between the output signals from the photoresponsive elements is used to move a phototaking objective lens along its optical path to reposition the objective lens in search for a true focus setting. The objective lens is brought into proper focus when the signal indicative of the phase difference assumes a predetermined electric relation with an electric signal indicative of the position of the objective lens along its optical axis.

REFERENCES:
patent: 4071297 (1978-01-01), Leitz et al.
patent: 4090209 (1978-05-01), Kondo
patent: 4110042 (1978-08-01), Leitz
patent: 4155044 (1979-05-01), Schulz

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