Video storage tube

Claim 1

IN COMBINATION: A STORAGE FILM IN CONTACT OVER A FIRST SURFACE WITH A CONDUCTIVE BACKPLATE; MEANS FOR FORMING AND PROJECTING A BEAM OF ELECTRONS TOWARD A TARGET SURFACE OF THE FILM; MEANS FOR DEFLECTING THE BEAM AND CAUSING IT TO SCAN PERIODICALLY THE TARGET SURFACE IN A LINE AND FRAME SEQUENCE; THE FILM BEING SUFFICIENTLY INSULATIVE TO PERMIT THE FORMATION OF A VOLTAGE PATTERN OF POTENTIAL DIFFERENCES ALONG THE TARGET SURFACE THEREOF, BUT BEING SUFFICIENTLY CONDUCTIVE TO PERMIT LEAKAGE CURRENTS TO FLOW FROM THE CONDUCTIVE BACKPLATE TO THE TARGET SURFACE; MEANS FOR ESTABLISHING A VOLTAGE PATTERNS ON THE TARGET SURFACE DEFINED BY DIFFERENT FIRST VOLTAGES ON DIFFERENT INCREMENTAL AREAS OF THE TARGET SURFACE, SAID VOLTAGE PATTERN BEING INDICATIVE OF AN INPUT SIGNAL; MEANS FOR DETECTING DIFFERENCES OF SECONDARY EMISSION FROM THE TARGET SURFACE AS THE BEAM SCANS, IT THEREBY RECOVERING A SIGNAL REPRESENTATIVE OF THE STORED VOLTAGE PATTERN AND OF THE INPUT SIGNAL; THE TIME CONSTANTS OF THE STORAGE FILM AND THE ELECTRON BEAM BEING SO RELATED TO THE LINE AND FRAME RATE OF THE ELECTRON BEAM SCAN THAT IN THE INTERIM BETWEEN SUCCESSIVE IMPINGEMENTS OF THE BEAM ON EACH INCREMENTAL TARGET SURFACE AREA SUFFICIENT LEAKAGE CURRENT FLOWS FROM THE FIRST SURFACE OF THE FILM TO THE TARGET SUFACE TO RECHARGE AND REINFORCE THE VOLTAGE OF THE INCREMENTAL AREA SUBSTANTIALLY TO ITS FIRST VOLTAGE; THE MINIMUM SPATIAL WAVELENGTH VOLTAGE DIFFERENCES PATTERN BEING LARGER THAN THE THICKNESS OF THE FILM, WHEREBY THE RESISTANCE BETWEEN VOLTAGE DIFFERENCES ON THE TARGET SURFACE IS LARGER THAN THE RESISTANCE BETWEEN THE FIRST SURFACE AND THE TARGET SURFACE OF THE STORAGE FILM.