| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a control method for normally optimal continuous flow of current in a filament coping with a change in contact resistance until fitting with plate springs after replacement of a filament and a severance of filament in a non-scanning type electron beam emitter with many plate springs suspended on two parallel feeder bars and many parallel filaments connected to the plate springs in a row. <P>SOLUTION: A target current value of filament is determined. When the filament voltage is constant or decreasing, the current value is kept constant, and when the current value decreases, the current value is controlled to have the current value for keeping the voltage constant as a target current value. <P>COPYRIGHT: (C)2004,JPO |
