Image dissector with field mesh near photocathode

Claim 1

AN IMAGE DISSECTOR TUBE COMPRISING: AN ENVELOPE; A PHOTOEMISSIVE CATHODE LAYER ON THE INNER SURFACE OF ONE END OF SAID ENVELOPE, SAID LAYER EMITTING ELECTRONS IN RESPONSE TO AN APPLIED OPTICAL IMAGE TO FORM A CORRESPONDING ELECTRON IMAGE; A LONGITUDINAL TUBULAR ANODE HAVING AN OPEN END ADJACENT SAID CATHODE SURFACE; A MESH SCREEN ACCELERATING ELECTRODE DISPOSED AT SAID OPEN END AND POSITIONED IN CLOSE PROXIMITY AND PARALLEL TO SAID CATHODE SURFACE; MEANS APPLYING AN ELECTRON ACCELERATING FIELD POTENTIAL TO SAID SCREEN AND ANODE WITH RESPECT TO SAID CATHODE; MEANS PROVIDING A SCANNING APERTURE AT THE OPPOSITE END OF SAID ANODE; FIRST ELECTROMAGNETIC MEANS SURROUNDING SAID TUBE AND ANODE FOR FOCUSING SAID ELECTRON IMAGE IN THE PLANE OF SAID APERTURE; SECOND ELECTROMAGNETIC MEANS SURROUNDING SAID TUBE AND ANODE FOR DEFLECTING SAID ELECTRON IMAGE ACROSS SAID APERTURE, SAID APERTURE PERMITTING PASSAGE OF ELECTRONS THERETHROUGH IN ACCORDANCE WITH SUCCESSIVELY SCANNED ELEMENTAL AREAS OF SAID ELECTRON IMAGE; ELECTRON MULTIPLIER MEANS POSITIONED ADJACENT SAID APERTURE TO PROVIDE AN AMPLIFIED SIGNAL IN ACCORDANCE WITH SAID SCANNED IMAGE; AND MEANS FOR DERIVING AN OUTPUT SIGNAL FROM SAID MULTIPLIER MEANS.