Multiple focus X-ray generator

Details Multiple focus X-ray generator Multiple focus X-ray generator

1979-11-08

1982-02-09

Anderson, Bruce C.

Radiant energy

With charged particle beam deflection or focussing

With target means

250413, 313 56, H05G 100

Patent

active

043151540

ABSTRACT:
An X-ray generator has at least a first and a second cathode filament for emitting electrons, one end of the first filament being connected to one end of the second filament, the connection point forming a terminal. Still two further terminals are located at the ends of the serial connection of the two filaments. Two of the three terminals are connected via a diode in each connection line to the first pole of a d-c source, while the third terminal is coupled to the second pole of the d-c source. Both diodes are oppositely poled. The polarity of the d-c voltage supplied by the d-c source can be changed, for example, by a remote reversing switch. The polarity of the d-c source determines which and how many filaments are energized to provide focal spots of different size. Since two supply lines are sufficient in a high-voltage cable for feeding the first and second filaments, a third line in the cable can be used for the supply of a third heating filament. This third filament may be coupled to one of the three terminals. Thus a triple focus x-ray generator which requires only three supply lines can be obtained. Also quadruple and higher focus X-ray generators may be obtained.

REFERENCES:
patent: 3110810 (1963-11-01), Fransen
patent: 3389253 (1968-06-01), Kok
patent: 3591821 (1971-07-01), Seki et al.
patent: 3649861 (1972-03-01), Atlee et al.
patent: 3946261 (1976-03-01), Holland et al.

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