Radiant energy – Photocells; circuits and apparatus – Photocell controls its own optical systems
Patent
1978-01-24
1980-04-29
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Photocell controls its own optical systems
354 25, G01J 136
Patent
active
042007860
ABSTRACT:
An apparatus for electrooptically focusing the objective in a single lens reflex camera provided with a focusing screen and a split image wedge rangefinder, where focus detectors are used in which an image segment is scanned in an image plane. The focusing window of the focusing screen provided with a split image wedge rangefinder (5) is followed by a pentaprism (8) having a first plane reflecting surface which is partly reflecting. The scanning grating (14) and the photoelectric detector system (17,18) are mounted in the direction of the light beam behind this plane surface of the pentaprism and along the optical axis deflected by one of the wedges (5a) and an optics (11) is present along the optical axis to image the plane of one of the wedges (5a) into that plane where the scanning takes place.
REFERENCES:
patent: 3953728 (1976-04-01), Leitz et al.
patent: 3953729 (1976-04-01), Hosoe et al.
patent: 4047022 (1977-09-01), Holle
patent: 4083056 (1978-04-01), Nakamura et al.
Ernst Leitz Wetzlar GmbH
Nelms David C.
Wells Gilbert L.
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