X-ray image tube

Details X-ray image tube X-ray image tube

1985-04-03

1986-09-09

Levy, Stewart J.

Electric lamp and discharge devices

Cathode ray tube

Image pickup tube

250213VT, 313530, H01J 3514

Patent

active

046111441

ABSTRACT:
An X-ray image tube has a vacuum envelope, a photocathode arranged at an input side in the vacuum envelope and having a curved surface open to an output side thereof, and a phosphor screen arranged at an output side in the vacuum envelope and having a surface on which electrons emitted from the photocathode are electrooptically focused. The photocathode consists of a central surface region with a diameter which is 1/2 to 4/5 of the diameter of the photocathode and a peripheral surface region. The central surface region has a profile such that an increment of the meridional curvature radius from the center to a peripheral portion thereof is larger than a constant derived from a linearity between the increment and a distance from the axis of the photocathode. The peripheral surface region has a profile such that an increment of the meridional curvature radius from an inner peripheral portion to an outer peripheral portion is smaller than the constant derived from a linearity between the increment and the distance from the axis of the photocathode.

REFERENCES:
patent: 3697795 (1972-10-01), Braun et al.
patent: 3784830 (1974-01-01), Schwierz et al.

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