Crt x-ray generator with beam velocity modulation for equalizing radiation

Claim 1

A HIGH POWER X-RAY TUBE COMPRISING, IN COMBINATION: (A) AN ANODE HAVING A SURFACE AREA; (B) A CATHODE FOR PRODUCING AND ELECTRON BEAM OF SMALL CROSS SECTION DIRECTED TOWARD SAID SURFACE AREA OF SAID ANODE, SAID SURFACE AREA BEING SUBSTANTIALLY GREATER THAN THE CROSS SECTION OF SAID ELECTRON BEAM; (C) DISTRIBUTED POTENTIAL TYPE ACCELERATING MEANS ARRANGED BETWEEN SAID CATHODE AND SAID ANODE FOR ACCELERATING THE BEAM TOWARD THE LATTER; (D) DEFLECTING MEANS ARRANGED BETWEEN SAID ACCELERATING MEANS AND SAID ANODE AND CAPABLE OF DEFLECTING THE BEAM IN TWO DIMENSIONS FOR CAUSING THE BEAM TO TRACE A TWO-DIMENSIONAL PATH ON SAID SURFACE AREA OF SAID ANODE TO COVER A LARGE FOCAL AREA WHICH ITSELF IS SUBSTANTIALLY GREATER THAN THE CROSS SECTION OF SAID ELECTRON BEAM; AND (E) MEANS FOR VARYING THE SCANNING SPEED OF SAID DEFLECTING MEANS TO OBTAIN A LOCAL HOMOGENEOUS RADIATION FIELD AHEAD OF SAID ANODE.