Electric lamp and discharge devices: systems – With cathode or cathode heater supply circuit – Pulsating or a.c. supply to the cathode or heater circuit
Patent
1977-09-13
1979-08-14
Chatmon, Jr., Saxfield
Electric lamp and discharge devices: systems
With cathode or cathode heater supply circuit
Pulsating or a.c. supply to the cathode or heater circuit
315 3951, 315 85, 315 94, 219 1055B, 219 1055D, 331 86, H05B 3900, H05B 4114
Patent
active
041646851
ABSTRACT:
A magnetron device emits through the filament terminals electromagnetic waves of a broad frequency band which act as noises to other electronic devices. The magnetron device comprises a filament or heater circuit for supplying heater voltage to the filament to emit thermal electrons from the cathode and an anode circuit for applying a required voltage across the filament and anode. The filament circuit is connected to one secondary winding of a power supply transformer and the anode circuit to the other secondary winding thereof. Connected to the anode power supply line is a filter device comprising a capacitor and a choking element having a sufficient inductance to reduce a relatively low frequency of the broad frequency band. This filter device is intended to reduce or suppress a large amount of the noise transmitted to the anode circuit out of a magnetron through filament terminals. Also connected to each of the two power supply lines of the filament circuit is a filter device comprising a capacitor and a choking element having an inductance. The filter device is intended to reduce or suppress the noise leaking from the anode circuit connecting the anode power supply line to the filament circuit. The three filter devices are received in a shield box connected to ground. The terminal portions of the three power supply lines project outside of the shield box.
REFERENCES:
patent: 3727098 (1973-04-01), Crapuchettes
patent: 3789263 (1974-01-01), Fritz et al.
patent: 3840774 (1974-10-01), Iwata
patent: 3846667 (1974-11-01), Hisada et al.
patent: 3873883 (1975-03-01), Siever et al.
patent: 3916247 (1975-10-01), Koinuma et al.
patent: 3922612 (1975-11-01), Tashiro
Chatmon, Jr. Saxfield
Tokyo Shibaura Electric Co. Ltd.
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