The "Chalnicon" - A new camera tube using a CdSe photoconductive layer

A new television camera tube the "Chalnicon" has been developed. The tube is a vidicon-type camera tube using a CdSe photoconductive layer as target material and has many excellent features; extremely high sensitivity, low dark current and good spectral response for visible light. An improved target structure has been employed in order to use the CdSe layer which has insufficient dark resistivity to operate as the target in the conventional structure. In the "Chalnicon", the light-electricity conversion is accomplished by the CdSe layer. Storage of the electric charge signal is accomplished by a second layer. The separation of these functions into two different layers makes it possible to utilize the highly sensitive CdSe layer as the target material of the camera tube.