Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1983-03-07
1987-04-21
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354407, G01J 120
Patent
active
046599177
ABSTRACT:
Disclosed is an optical system for detecting the state of focus in which the exit pupil of an image-forming optical system is optically divided into a plurality of exit pupils by an optical member having a beam splitting element, the image-forming light beams from the divided exit pupils are used to form a plurality of image intensity distributions regarding an object image, sensor series each having a plurality of sensors and putting out signals corresponding to the image intensity distributions are disposed at positions whereat the plurality of image intensity distributions are formed, and the output signals from the sensor series are used to detect the relative position of the image intensity distributions to thereby discriminate the state of focus of the image-forming optical system.
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Matsumura Susumu
Otaka Keiji
Suzuki Kenji
Suzuki Takashi
Canon Kabushiki Kaisha
Nelms David C.
Oen William L.
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