Some new structure-type targets for the vidicon - Analysis of their operation

Severe physical requirements are imposed on the photoconductive layer used in the conventional vidicon camera tube target. In particular, its resistivity must be of the order of 10¹²ohm-cm for frame storage operation and its thickness must be sufficient to prevent capacitive lag. New vidicon targets of a complex structure permit a relaxation of these requirements on the photoconductor. Two types of targets are discussed. 1) An experimental "lateral-flow" structure in which the photocurrent flows parallel to the target plane instead of transversely as in the standard vidicon. 2) An experimental "bridge-type" structure in which each picture element provides an internal closed circuit so that the charge pattern is established independently of the scanning beam.