Browse Prior Art Database

Removing/Replacing Anti Reflective Safety Panels on Cathode Ray Tubes

IP.com Disclosure Number: IPCOM000052210D
Original Publication Date: 1981-May-01
Included in the Prior Art Database: 2005-Feb-11
Document File: 1 page(s) / 12K

Publishing Venue

IBM

Related People

Bradley, ME: AUTHOR [+2]

Abstract

Cathode ray tubes (CRTs) are sometimes provided with an anti-reflective coated glass safety panel permanently bonded to the glass face (screen) of the CRT. If either the CRT or the panel must be replaced, the whole assembly must be scrapped.

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Removing/Replacing Anti Reflective Safety Panels on Cathode Ray Tubes

Cathode ray tubes (CRTs) are sometimes provided with an anti-reflective coated glass safety panel permanently bonded to the glass face (screen) of the CRT. If either the CRT or the panel must be replaced, the whole assembly must be scrapped.

This article describes a method to allow the anti-reflective safety panel to be considered a removable attachment, with optical effectiveness equal to the above-described bonded arrangement.

In accordance with this method, in place of the usual bonding resin, a sheet of partially cured resin, which has the same index of refraction as the glass, is introduced between the anti-reflective panel and the face of the CRT. However, before the sheet is put in place, both sides are covered with a release agent/lubricant, so that although the sheet hardens in general conformity with the facing surfaces of the panel and the CRT, it does not adhere to either. Moreover, the lubricant ensures complete contact, free of air bubbles, etc.

Releasable clamps hold the assembly together, but permit disassembly for replacement of either the CRT or the panel, using a new lubricated resin sheet at their interface. Such clamps can be mounted on the usual implosion band around the CRT and be hooked over the edge of the panel, with or without a bezel therearound.

In one example, Dow Chemical Resin 741 and Hardener 61 were mixed to a suitable consistency and used for the partially cur...