An amorphous silicon imaging tube using high-velocity beam scanning

An imaging tube using hydrogenated amorphous silicon as the photoconductive target with a blocking-type structure and a high secondary electron emission yield surface is successfully operated using a high-velocity electron-beam scanning mode. The internal electric field in the photoconductor is the opposite of those used in conventional tubes in that the secondary electron current is obtained as a video signal. This imaging tube overcomes a lot of the disadvantages of conventional imagers, especially very small decay lag at both high- and low-illumination levels, a high uniform resolution of more than 700 TV lines, and no burning or blooming.