X-ray tube with ferrite core filament transformer

Details X-ray tube with ferrite core filament transformer X-ray tube with ferrite core filament transformer

1993-06-03

1994-03-01

Porta, David P.

X-ray or gamma ray systems or devices

Source

Electron tube

378134, 378136, H01J 3504

Patent

active

052915387

ABSTRACT:
An evacuated envelope (C) which is connected with an anode (A), has a cathode assembly (B) rotatably mounted inside. Magnets (44, 46) hold the cathode assembly stationary as the anode and envelope rotate. A ferrite core transformer (60) includes a ferrite core primary (66) stationarily mounted exterior to the envelope. A secondary (64) is mounted to the cathode assembly interior to the envelope. The secondary winding includes a ferrite core (70), a portion of which is surrounded by a ceramic, dielectric bobbin (76). The bobbin includes walls or ridges (78) which define a spiral groove (80) therearound in which an uninsulated electric wire (82) is received. The uninsulated electric wire is connected with a cathode filament (52). The primary winding has a ferrite core (90) that has about five times the cross section as the secondary ferrite core to compensate for a low, about 20%, coupling efficiency between the primary and secondary windings. Preferably, the primary winding core tapers (94) adjacent its pole faces to focus magnetic flux toward pole faces (72, 74) of the secondary ferrite core.

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