Use of Color Filters in a Television Film Camera Chain

The quality of pictures televised by an iconoscope film camera is improved by removing the red and infrared portions of the radiation incident upon the mosaic of the iconoscope. The combination of heat-absorbing glass with either an absorption or a reflection type of color filter can be used in the condenser optical system of a 16-mm projector. Such a combination of filters reduces the heat at the film gate enough to permit the film to be held stationary in the gate without damage to the film. The color filters improve picture sharpness, reduce shading requirements, and increase the signal level. The improvement in sharpness is partly an optical effect. The increase in signal level, despite the reduction of photoactive radiation, is believed to be an electronic effect peculiar to the iconoscope principle.

Print ISSN

0898-042X

Published

1951-09

Content type

Original Research

DOI

10.5594/J11340