| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an X-ray tube electron source which is relatively expensive and extended in life. <P>SOLUTION: An X-ray tube includes an emitter wire (18) enclosed in a suppressor (14, 16). An extraction grid includes a number of parallel wires (20) extending perpendicular to the emitter wire, and a focusing grid includes a number of wires (22) parallel to the grid wires (20) and spaced apart at equal spacing to the grid wires (20). The grid wires are connected by means of switches to a positive extracting potential or a negative inhibiting potential, and the switches are controlled so that at any one time a pair of adjacent grid wires (22) are connected together to form an extracting pair, which produces an electron beam. The position of the beam is moved by switching different pairs of grid wires to the extracting potential. <P>COPYRIGHT: (C)2012,JPO&INPIT |
