System for synchronizing a scanning electron beam with a rotating body

Claim 1

AN ELECTRICAL CONTROL SYSTEM FOR SYNCHRONIZING THE SCANNING MOVEMENTS OF A HIGH ENERGY BEAM ON THE PERIPHERAL SURFACES OF A ROTATING BODY SO THAT SAID BEAM IMPINGES ON A PARTICULAR POINT OF SAID BODY DURING A PREDETERMINED ARCUATE DISPLACEMENT OF SAID BODY, SAID BODY HAVING REFERENCE MEANS ASSOCIATED THEREWITH FOR PROVIDING REFERENCE MEANS ASSOCIATED THEREWITH FOR OF AT LEAST ONE PRECHOSEN POINT LOCATED ON PERIPHERAL SURFACES OF A SAID BODY, SAID SYSTEM COMPRISING (A) A FIRST SIGNAL GENERATING MEANS FOR PRODUCING SIGNALS IN RESPONSE TO SUCH REFERENCE INFORMATION INDICATING REVOLUTIONS OF A SAID BODY; (B) A SECOND SIGNAL GENERATING MEANS FOR PRODUCING SIGNS IN RESPONSE TO SUCH REFERENCE INFORMATION INDICATING ARCUATE DISPLCEMENT OF SAID ONE POINT DURING EACH REVOLUTION; (C) BEAM SCANNING CONTROL MEANS FOR DETECTING WHEN A PREDETERMINED RELATIONSHIP OCCURS BETWEEN THE OUTPUT OF SAID FIRST SIGNAL GENERATING MEANS AND THE OUTPUT OF SAID SECOND SIGNAL GENERATING MEANS AND FOR PRODUCING AN OUTPUT SIGNAL THEREFROM WHEN A SAID PREDETERMINED RELATIONSHIP OCCURS; (D) MEANS INTERCONNECTING EACH OF SAID FIRST SIGNAL GENERATING MEANS AND SAID SECOND SIGNAL GENERATING MEANS WITH SAID BEAM SCANNING CONTROL MEANS; (E) BEAM GENERATOR CONTROL MEANS RESPONSIVE TO SAID BEAM SCANNING CONTROL MEANS FOR PRODUCING AN ELECTRICAL SIGNAL OUTPUT ADAPTED TO ACTUATE A BEAM SOURCE; (F) BEAM DEFLECTING CONTROL MEANS RESPONSIVE TO SAID BEAM SCANNING CONTROL MEANS FOR MOVING A SAID BEAM THROUGHT A PREDETERMINED SCAN SEQUENCE; AND (G) BEAM PROGRAMMING MEANS RESPONSIVE TO SAID BEAM SCANNING CONTROL MEANS FOR CONTROLLING THE ACTUATING INTERVAL OF SAID BEAM GENERATOR CONTROL MEANS AND FOR ACTUATING SAID BEAM DEFLECTING CONTROL MEANS TO RETURN A SAID BEAM TO A STRTING POSITION.

Claim 3

A METHOD FOR SYNCHORIZING FOR A PREDETERMINED PERIOD OF TIME SCANNING MOVEMENT OF A HIGH ENERGY BEAM WITH A PREDETERMINE POINT ON THE SURFACE OF A ROTATING BODY, WHEREIN THE SOURCE OF SAID HIGH ENERGY BEAM IS MAINTAINED AT A FIXED DISTANCE FROM THE SURFACE OF SAID ROTATING BODY, SAID METHOD COMPRISING THE STEPS OF (A) GENERATING SIGNALS IN RESPONSE TO ROTATIONAL MOVEMENT OF SAID BODY TO INDICATE THE ANGULAR POSITION OF A SAID PREDETERMINED POINT ON THE SURFACE OF A SAID ROTATING BODY; (B) TRANSMITTING SAID SIGNALS TO CONTROL MEANS FOR ESTABLISHING THE OCCURRENCE OF A SAID PREDETERMINED POINT ON SAID BODY REACHING A PREDETERMINED POSITION WITH RESPECT TO SAID FIXED BEAM SOURCE; AND (C) SYNCHRONIZING THE SCANNING RATE OF SAID BEAM WITH THE ANGULAR VELOCITY OF A SAID PREDETERMINED POINT WHILE SIMULTANEOUSLY MAINTAINING THE INTENSITY OF SUCH BEAM AT A PREDETERMINED LEVEL FOR A PREDETERMINED INTERVAL OF TIME.

Claim 4

A METHOD FOR SYNCHORIZING FOR A PREDETERMINED PERIOD OF TIME SCANNING MOVEMENT OF A HIGH ENERGY BEAM WITH A PREDETERMINE POINT ON THE SURFACE OF A ROTATING BODY, WHEREIN THE SOURCE OF SAID HIGH ENERGY BEAM IS MAINTAINED AT A FIXED DISTANCE FROM THE SURFACE OF SAID ROTATING BODY, SAID METHOD COMPRISING THE STEPS OF (A) GENERATING SIGNALS IN RESPONSE TO ROTATIONAL MOVEMENT OF SAID BODY TO INDICATE THE ANGULAR POSITION OF A SAID PREDETERMINED POINT ON THE SURFACE OF A SAID ROTATING BODY; (B) TRANSMITTING SAID SIGNALS TO CONTROL MEANS FOR ESTABLISHING THE OCCURRENCE OF A SAID PREDETERMINED POINT ON SAID BODY REACHING A PREDETERMINED POSITION WITH RESPECT TO SAID FIXED BEAM SOURCE; AND (C) SYNCHRONIZING THE SCANNING RATE OF SAID BEAM WITH THE ANGULAR VELOCITY OF A SAID PREDETERMINED POINT WHILE SIMULTANEOUSLY MAINTAINING THE INTENSITY OF SUCH BEAM AT A PREDETERMINED LEVEL FOR A PREDETERMINED INTERVAL OF TIME.