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Forming a Deformagraphic Layer in a Cathode Ray Tube

IP.com Disclosure Number: IPCOM000090856D
Original Publication Date: 1969-Jul-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Costa, MJ: AUTHOR [+2]

Abstract

This electrostatic storage and display device employs a target electrode in the form of a thin mica screen across the bell of a cathode ray tube, parallel to and behind the face of the tube. The screen carries a layer of deformable material on its surface opposite from the electron gun. When charges are deposited on the gun side of that screen by action of the electron beam, electrostatic forces are set up which deform the material.

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Forming a Deformagraphic Layer in a Cathode Ray Tube

This electrostatic storage and display device employs a target electrode in the form of a thin mica screen across the bell of a cathode ray tube, parallel to and behind the face of the tube. The screen carries a layer of deformable material on its surface opposite from the electron gun. When charges are deposited on the gun side of that screen by action of the electron beam, electrostatic forces are set up which deform the material.

The device includes support ring 10 for thin screen 12, welded between the edge of the bell or funnel 14, and cover member 16. Bell 14 and cover 16 are provided with exhaust ports 18 and 20 through which both main and auxiliary chambers 22 and 24 are evacuated. This evacuation is effected simultaneously so as not to place stresses on screen 12. After bake-out, a monomer such as vinyl chloride, vinyl acetate, styrene, methyl acrylate, isobutylene, butadiene, or the like is admitted in gaseous state via inlet 26 at low pressure. Approximately 10/-5/ torr. The desired deformable layer is then formed in place on the front of screen 12 by addition polymerization.

For limiting deposit of the polymer to the face of screen 12 and for obtaining a thin, uniform deposition of the polymer, selective catalyzation is utilized. In one method, a very thin salt layer 28 is deposited on the face of screen 12 before the tube is closed. This salt acts as a catalyst defining the area of addition polymer...