Browse Prior Art Database

CRT Having Face Plate With Directly Applied Optical Coating

IP.com Disclosure Number: IPCOM000049387D
Original Publication Date: 1982-Apr-01
Included in the Prior Art Database: 2005-Feb-09
Document File: 2 page(s) / 19K

Publishing Venue

IBM

Related People

Bradley, ME: AUTHOR [+3]

Abstract

The usual method of providing a vacuum-deposited, multilayer anti-reflection coating on a cathode ray tube (CRT) is to have the glass manufacturer make the CRT funnel and face plate, flame seal them together to form a bulb, and send it to a CRT manufacturer for processing into a usable CRT. The glass vendor must also make a glass panel and shape it to the CRT face plate. This glass panel acts as a substrate on which the multilayer anti-reflective coating is vacuum-deposited. This coated panel is then sent to the CRT manufacturer, where it is epoxy-bonded to the face plate of the CRT.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 60% of the total text.

Page 1 of 2

CRT Having Face Plate With Directly Applied Optical Coating

The usual method of providing a vacuum-deposited, multilayer anti-reflection coating on a cathode ray tube (CRT) is to have the glass manufacturer make the CRT funnel and face plate, flame seal them together to form a bulb, and send it to a CRT manufacturer for processing into a usable CRT. The glass vendor must also make a glass panel and shape it to the CRT face plate. This glass panel acts as a substrate on which the multilayer anti-reflective coating is vacuum- deposited. This coated panel is then sent to the CRT manufacturer, where it is epoxy-bonded to the face plate of the CRT.

An approach to simplifying the process is to apply the coating directly to the face plate of a CRT, eliminating the panel. The completed bulb would be sent from the glass vendor to the coating vendor and then to the CRT manufacturer for processing.

This procedure, although suitable for very low quantity applications, might not be adequate for high volumes. The limiting factor is that the depth of the bulb restricts the quantity that can be processed in the usual coating chambers. Another factor is the bulkiness and cost of shipping large bulbs back and forth between the three vendors.

A change in the process flow during construction of the assembly will allow the coating 14 to be applied directly to the CRT face plate 10 instead of a separate glass panel.

The glass vendor, prior to flame sealing the face plate 10 to the fun...