Electrostatic reproducing apparatus

Claim 1

AN ELECTROSTATIC REPRODUCER FOR PLAYBACK OF ELECTROSTATIC RECORDS COMPRISING IN COMBINATION: A CATHODE RAY TUBE INCLUDING AN ELECTRON BEAM CURRENT GENERATOR; SCANNING MEANS FOR DEFLECTING SAID ELECTRON BEAM; A BEAN IMPINGING PORTION OF SAID TUBE HAVING A MULTIPLICITY OF CONDUCTIVE ELECTRODES PASSIGN THERETHROUGH MEANS ELECTRICALLY CONNECTED TO SAID CONDUCTIVE ELECTRODES TO EFFECTIVELY MAINTAIN THE D.C. LEVEL AT GROUND POTENTIAL DURING OPERATION; A BACKING ELECTRODE OPPOSITE SAID CONDUCTIVE ELECTRODES ARRANGED TO PASS SAID RECORDS THEREBETWEEN; INSULATING SECONDARY ELECTRON EMITTING MEANS INTERPOSED BETWEEN SAID ELECTRODES AND SAID BEAM WITH SAID INSULATING SECONDARY ELECTRON EMITTING MEANS HAVING A D.C. RATIO OF SECONDARY ELECTRON EMITTING MEANS HAVING A ELECTRON BEAM CURRENT OF ABOUT UNITY AND VARIED AS A RESULT OF THE ELECTROSTATICALLY INDUCED CHARGE ON SAID ELECTRODES BY SAID RECORD IN CONTACT THEREWITH; SECONDARY ELECTRON COLLECTING MEANS WITHIN SAID TUBE; MEANS CONNECTED TO SAID COLLECTING MEANS RESPONSIVE TO THE MAGNITUDE OF SECONDARY ELECTRONS COLLECTED TO GENERATE A SIGNAL PROPORTIONAL THERETO; AND AN ION GENERATOR DISPOSED BETWEEN SAID ELECTRODES AND A RECORD MEDIUM TAKE-UP DEVICE TO EMIT IONS OF BOTH POLARITIES ONTO THE SURFACES OF SAID MEDIUM.