Display tube having discrete X-ray absorbing means and methods o

Details Display tube having discrete X-ray absorbing means and methods o Display tube having discrete X-ray absorbing means and methods o

1990-10-30

1992-06-23

O'Shea, Sandra L.

Electric lamp and discharge devices

Cathode ray tube

Envelope

315 85, 445 3, 445 58, H01J 942, H01J 2906

Patent

active

051246147

ABSTRACT:
A method of manufacturing a display tube comprising an envelope having an envelope portion and a display window. The quantity of X-rays released from the envelope portion is determined, after which discrete X-ray absorbing means are provided in those places of the envelope where the quantity of X-rays released exceeds a limiting value. In a display tube manufactured according to such a method and comprising, in particular, a substantially rectangular display screen and a cylindrical neck portion having an electron gun the diagonals of the envelope of which are provided with discrete X-ray absorbing means, the desirable quantity of X-rays is absorbed in a simple and cost-effective manner.

REFERENCES:
patent: 3562518 (1971-02-01), Javorik et al.
patent: 4916358 (1990-04-01), Bunton

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