Method and arrangement for preventing cathode damage when switch

Details Method and arrangement for preventing cathode damage when switch Method and arrangement for preventing cathode damage when switch

1984-09-05

1986-12-09

Moore, David K.

Electric lamp and discharge devices: systems

With cathode or cathode heater supply circuit

Delayed application of the discharge potential

313336, 313152, 315107, 315 74, 315119, H05B 3900, H01J 1932

Patent

active

046282262

ABSTRACT:
The invention is directed to a method of preventing cathode damage when switching on an electron gun having a field emission cathode assembly including a cathode, a first electrode and a ground electrode. During normal operation of the electron gun, an extraction voltage is applied across the cathode and the first electrode and an accelerating voltage is applied across the cathode and the ground electrode. A direct galvanic connection is established between the cathode and the first electrode prior to normal operation of the electron gun. During a burn-in period, only the accelerating voltage is applied. This accelerating voltage may include an overvoltage of up to twenty percent. Then the galvanic connection between the cathode and the first electrode is interrupted and the extraction voltage is applied. An arrangement for carrying out the invention is also disclosed.

REFERENCES:
patent: 3397337 (1968-08-01), Denholm
patent: 3693607 (1972-09-01), Pasbrig
patent: 3878424 (1975-04-01), Suganuma
patent: 3921022 (1975-11-01), Levine
patent: 3921078 (1975-11-01), Aihara et al.
patent: 3936756 (1976-02-01), Someya et al.
patent: 4019077 (1977-04-01), Sakitani
patent: 4206385 (1980-06-01), Wisbey
patent: 4379250 (1983-04-01), Hosoki et al.
patent: 4427886 (1984-01-01), Martin et al.

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