Transmissivity measuring apparatus for a color separation prism

Details Transmissivity measuring apparatus for a color separation prism Transmissivity measuring apparatus for a color separation prism

1992-07-21

1994-05-10

Warden, Robert J.

Optics: measuring and testing

By shade or color

Trichromatic examination

356425, G01N 2125, G01J 346

Patent

active

053112920

ABSTRACT:
An apparatus for measuring color transmissivities of a color separation prism P includes (where the color separation prism P receives a measurement light S on an incident path and emits three color lights Sr, Sg and Sb on three exit paths of different directions): a photomultiplier 21 and an integrating sphere I for measuring an intensity of light entering the integrating sphere I on an entrance path, where the entrance path is set detached from an extension of the incident path; a first movable mirror 9 located in one of four paths including an extension of the incident path and the three exit paths for reflecting the light on each path to the second movable mirror 10; and a second movable mirror 10 placed on the entrance path of the integrating sphere I (with the photomultiplier 21) and oriented in one of four directions for reflecting the light from the first movable mirror 9 to the integrating sphere I. Because the 100%-transmission light and the three color lights transmitted through the color separation prism P undergo the same optical history, absolute transmissivities of the color lights can be measured, and the two-beam method can be used since the integrating sphere I is fixed.

REFERENCES:
patent: 4762412 (1988-08-01), Ohkubo et al.
patent: 5106190 (1992-04-01), Fukuma
patent: 5164788 (1992-11-01), Yoshikawa

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