The mask for scanning tube of a television camera and of a television camera comprising such a mask

摘要

Mask intended to be placed on the front of a scanning tube of a television camera to reduce the diffusion of the periphery of the useful image in the useful image. / p & & p & the mask comprises, in addition to a ed ris tho f of a relatively small dimensions, the openings s1 - s4 specially arranged in a manner as to show the edge of the target of the tube; thus, thanks to a pattern of setting (0, a1 - a4, b1 - b4 im), mounted in front of the camera and observed on a screen associated with the camera, it is possible to center the scanning of the tube with respect to the target, by noting on the edge of the target and without this edge appears in the actual ed ris tho. / p & & p & application to the cameras of television.