Projection tube with X-ray shielding means on target

Details Projection tube with X-ray shielding means on target Projection tube with X-ray shielding means on target

1978-12-11

1980-11-04

Demeo, Palmer C.

Electric lamp and discharge devices

Cathode ray tube

Screen

313479, H01J 2906, H01J 2928

Patent

active

042322472

ABSTRACT:
A projection tube projects in front a visible light image produced by irradiating a target having a fluorescent screen formed on one surface thereof with an electron beam emitted from an electron gun. The projection tube includes an X-ray shield disposed to cover the surface of the target excluding the fluorescent screen, whereby the X-ray generated by irradiating the fluorescent screen on the target with the electron beam are shielded to prevent the transmission of the X-rays to the front of the projection tube, and also the X-ray shield has the effect of dissipating the heat from the target and simplifying the target positioning operation in the manufacture of projection tubes.

REFERENCES:
patent: 2291406 (1942-07-01), Paehr
patent: 2453003 (1948-11-01), Edwards
patent: 2960615 (1960-11-01), Harries
patent: 3543073 (1970-11-01), Sheldon
patent: 3610994 (1971-10-01), Sheldon

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