Focus detecting apparatus

Details Focus detecting apparatus Focus detecting apparatus

1980-01-15

1982-06-22

Nelms, David C.

Radiant energy

Photocells; circuits and apparatus

Photocell controls its own optical systems

250204, G01J 120

Patent

active

043364500

ABSTRACT:
A focus detecting apparatus comprises first means for forming phase outputs from said first and second photosensor arrays of phases respectively corresponding to the relative positions of said first and second photosensor arrays with respect to the light images thereon; second means for comparing the output corresponding to the amount of light entering said first photosensor array with the output corresponding to the amount of light entering said second photosensor array and forming a correlation output corresponding to said comparison; third means for forming outputs corresponding to the sharpness of light images on said photosensor arrays from the outputs from said arrays; and processing means for generating a synthesized output signal representing the focus state of said objective lens with respect to the object from the aforementioned phase outputs, correlation output and sharpness outputs.

REFERENCES:
patent: 3844658 (1974-10-01), Gela et al.
patent: 3875401 (1975-04-01), Stauffer
patent: 4010479 (1975-06-01), Nobusawa
patent: 4078171 (1978-03-01), Stauffer

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