Browse Prior Art Database

Dark Trace Cathode Ray Screen Free of Flaking

IP.com Disclosure Number: IPCOM000094653D
Original Publication Date: 1965-Apr-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 60K

Publishing Venue

IBM

Related People

Maissel, LI: AUTHOR

Abstract

A compact, encapsulated screen for dark trace cathode ray tubes is formed by cathode sputtering.

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Dark Trace Cathode Ray Screen Free of Flaking

A compact, encapsulated screen for dark trace cathode ray tubes is formed by cathode sputtering.

The sputtering is performed within vacuum chamber 10 which includes mica substrate 2 mounted on anode 4. In parallel-spaced relation is disposed cathode 6 upon which is positioned target T, a dielectric sheet. Shield 8 is disposed about cathode 6. Pressure is reduced within chamber 10 by vacuum pump 12. Conduit 14 is for the injection of inert gas.

Sputtering is commenced by injecting inert gas to a pressure of about 0. 01 torr and applying a potential between anode 4 and cathode 6 from a high- frequency excitation source. The argon atoms are ionized and ions are propelled toward dielectric T, where, upon impact, particles are released. These sputtered particles are accelerated, by action of the fields present, toward substrate 2 where condensation takes place to form a layer.

Screen 30, made by sputtering, includes mica substrate portion 2 over which is superimposed a glass layer 16. Over glass layer 16 is disposed layer 18. This is a dispersion of alkali halide crystals, such as potassium chloride, in a glass matrix, which is the photochromatic source for the screen. Encapsulating glass layer 20 completes the screen. Each layer 16, 18 and 20 is separately deposited by the cathode sputtering as described. Potassium chloride crystals are intimately mixed with glass powder and thereafter pressed to form layer 18.

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