Electro-optical systems

Abstract

This invention relates to an electro-optical system having a red reflecting dichroic mirror arranged to reflect red light to a first photomultiplier through a red-transmitting filter, and to transmit blue and green light to a blue reflecting dichroic mirror arranged to reflect blue light received thereby from the red reflecting dichroic mirror to a second photomultiplier through a series combination of a low pass blue transmitting filter and a high pass blue transmitting filter and to transmit green light. A third photomultiplier being arranged to receive through a green transmitting filter green light received by the blue reflecting dichroic mirror from the red reflecting dichroic mirror. The photomultipliers produce electrical signals representative of the intensity of the light incident on their photocathodes. The electro-optical system includes a cathode ray tube and lens for scanning an image bearing medium with a spot of light over a limited region, and three plano-cylindrical lenses for producing respective distributions of light over the photocathodes of the photomultipliers. This optical arrangement produces substantially the same distribution of light of the said photosensitive area for all positions of the spot of light in the said limited region.

Dependencies are inferred from the claim text.