Device for measuring light incident on an image forming optical

Details Device for measuring light incident on an image forming optical Device for measuring light incident on an image forming optical

1978-01-16

1979-12-11

Griffin, Donald A.

354152, G03B 700, G03B 1912

Patent

active

041780841

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 diffraction elements. 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 have 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, the 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 emerging from 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: 3498198 (1970-03-01), Fujii
patent: 3798660 (1974-03-01), Hasegawa et al.
patent: 3810202 (1974-05-01), Uno et al.

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