Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1980-01-03
1981-10-27
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
250204, G01J 120
Patent
active
042975719
ABSTRACT:
In a focus detecting device having a first and second photoelectric element arrays each including a plurality of photo-electric elements disposed so as to mutually correspond in position and optical means for forming a first image and a second image of an object on the first and second arrays, respectively, there is provided first means for calculating the differences between electrical outputs related to the outputs of the mutually corresponding ones of the photoelectric elements of the first and second arrays and adding together the quantities based on said differences, second means for calculating the difference between each electrical output related to the output of each of the photoelectric elements and each electrical output related to the output of the photoelectric element spaced apart from each photoelectric element with a predetermined number of photoelectric elements interposed therebetween in the direction of arrangement of the elements of the arrays and adding together the quantities based on said differences, and third means for detecting the focused condition of the objective lens on the basis of the outputs of said first means and said second means.
REFERENCES:
patent: 3875401 (1975-04-01), Stauffer
patent: 4083056 (1978-04-01), Nakamura et al.
patent: 4250376 (1981-02-01), Joseph et al.
Hoshino Kunihisa
Ogasawara Akira
Shirasu Hiroshi
Utagawa Ken
Nelms David C.
Nippon Kogaku K.K.
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