X-ray tube with capacitively coupled filament drive

Details X-ray tube with capacitively coupled filament drive X-ray tube with capacitively coupled filament drive

1992-01-06

1993-04-06

Porta, David P.

X-ray or gamma ray systems or devices

Source

Electron tube

378101, 378134, 378136, H01J 3506

Patent

active

052009858

ABSTRACT:
A cathode assembly (B) including cathode filaments (52, 54) remain stationary in the interior of a rotating evacuated envelope (C). The cathode filaments generate a beam of electrons (12) which strike an annular anode surface (10) that rotates with the envelope to generate a beam of x-rays (14). Electrical power from an AC electrical source (62) is conveyed across a circularly cylindrical peripheral side wall (20) of the envelope by pairs of concentric capacitive ring members (64, 70); (66, 72). One of the cathode filaments is selected either with (i) reed switches (82, 84), (ii) by bringing a selected one of the filaments and the capacitor rings into resonance at the frequency of the AC electrical source with a switch (86) and inductance (88a, 88b), or (iii) with a third pair of annular capacitive members (100, 102).

REFERENCES:
patent: 2111412 (1938-03-01), Ungelenk
patent: 3852605 (1974-12-01), Watanabe et al.
patent: 4045672 (1977-08-01), Watanabe
patent: 4199684 (1980-04-01), Leunbach et al.
patent: 4206356 (1980-06-01), Wardley et al.
patent: 4250425 (1981-02-01), Gabbay et al.
patent: 4417171 (1983-11-01), Schmitmann
patent: 4521900 (1985-06-01), Rand
patent: 4769831 (1988-09-01), Broenner
patent: 4788705 (1988-11-01), Anderson
patent: 4869257 (1989-09-01), Molnar et al.
patent: 4878235 (1989-10-01), Anderson
patent: 4914681 (1990-04-01), Klingenbeck et al.

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