X-ray tube anode focusing by low voltage bias

Details X-ray tube anode focusing by low voltage bias X-ray tube anode focusing by low voltage bias

1989-07-25

1991-04-09

Fields, Carolyn E.

X-ray or gamma ray systems or devices

Source

Electron tube

378101, 378136, H01J 3514

Patent

active

050070746

ABSTRACT:
An x-ray tube is disclosed whose cathode cup is battery biased at a low level, approximately 30 volts DC, to inhibit "wings" on the focal spot of electrons bombarding the anode. The battery for providing bias, floats at the DC electrical potential applied to the cathode, many KV below ground potential. Geometric modifications to the filament/focusing cup arrangement are also included. The geometrical characteristics partially inhibit the dispersion of electrons, inhibiting the formation of "wings" on the x-ray focal spot, particularly at high current levels. At lower current levels, the low DC battery bias enhances the anti-dispersion effects of the geometrical characteristics to inhibit wing formation even at these lower current levels.

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