Radiant energy – Photocells; circuits and apparatus – Optical or pre-photocell system
Patent
1976-06-01
1978-07-25
Nelms, David C.
Radiant energy
Photocells; circuits and apparatus
Optical or pre-photocell system
350162R, G02B 514
Patent
active
041031539
ABSTRACT:
The present invention relates to a device for measuring light incident on an image forming optical system, making use of a plural number of the diffraction element. The plural number of the diffraction elements are respectively provided in the optical path of the image forming optical system. Further the plural number of the diffraction elements respectively present a certain predetermined area. The plural number of the diffraction elements, seen along the direction of the optical axis of the image forming optical system, are substantially only partially overlapped with respect to each other. The light beam incident on a diffraction element is divided into a non diffracted light beam and a diffracted light beam. Thus diffracted light beam is directed toward the light detecting means so as to be measured while the non diffracted light beam advances along the above mentioned optical axis. Consequently at the part at which the diffraction elements overlap each other, the non diffracted light beam led out of the preceeding diffraction element again enters the following diffraction element. This light beam is again divided into a non diffracted light beam and a diffracted light beam by means of the following diffraction element. The diffracted light beam is measured by a light detecting means in the same way as in the above mentioned case, while the non diffracted light beam advances along the above mentioned optical axis. Thus the light beam which passes through the overlapping parts is measured a plural number of times.
REFERENCES:
patent: 3501238 (1970-03-01), Stetson et al.
patent: 3549239 (1970-12-01), Brienza et al.
patent: 3584948 (1971-06-01), Herriett
patent: 3698795 (1972-10-01), Flint
patent: 3800298 (1974-03-01), Ogura et al.
patent: 3936138 (1976-02-01), Noguchi
Ito Tadashi
Koyama Aiichiro
Matsumoto Kazuya
Matsumura Susumu
Okuno Youichi
Canon Kabushiki Kaisha
Nelms David C.
Sunderdick Vincent J.
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