IMAGE PICK-UP ELECTRON TUBE WITH MOLDED SIGNAL INPUT PLATE AND FABRICATION METHOD THEREOF

摘要

The disclosure concerns television cameras having an image pick-up electron tube. The signal input plate of the tube according to the invention is made by molding and a connection pin is embedded in the glass during the molding operation itself. When the internal and external faces of the input plate are then polished, the end of the pin on the internal side of the pin is levelled down at the same time. All that remains to be done then is to deposit a transparent conductive layer and a photoconductive target on this perfectly plane face. Furthermore, the unpolished edges of the input plate and, more particularly, its lateral edges are covered with a light-absorbing black layer which is produced not by the deposition of a black paint but by chemical reduction of the metal oxides contained in the glass. This blackening is preferably obtained during the molding operation itself, by placing the mold in a hydrogen-reducing atmosphere.