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Glass Preforms for Gas Panel

IP.com Disclosure Number: IPCOM000081856D
Original Publication Date: 1974-Aug-01
Included in the Prior Art Database: 2005-Feb-28
Document File: 1 page(s) / 11K

Publishing Venue

IBM

Related People

Foster, BJ: AUTHOR [+5]

Abstract

For proper operation of gas display panels, it is essential that the seal between the front and rear panel be hermetic. The hermetic seal is often accomplished by the use of vitreous cylindrical glass preforms which are flowed at the seal temperature to affect the sealing. So that the active members in the display device are protected, it is often necessary to limit the sealing temperature. This limitation on the sealing temperature requires that the glass be a high-lead solder glass and that it contain CuO in its composition. The copper oxide, however, presents leakage paths at the corners where it is welded or subjected to high temperatures. The process described below which includes cleaning of rods of preferred geometry eliminates the problems with precipitation of copper oxide at the corners.

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Glass Preforms for Gas Panel

For proper operation of gas display panels, it is essential that the seal between the front and rear panel be hermetic.

The hermetic seal is often accomplished by the use of vitreous cylindrical glass preforms which are flowed at the seal temperature to affect the sealing. So that the active members in the display device are protected, it is often necessary to limit the sealing temperature. This limitation on the sealing temperature requires that the glass be a high-lead solder glass and that it contain CuO in its composition. The copper oxide, however, presents leakage paths at the corners where it is welded or subjected to high temperatures. The process described below which includes cleaning of rods of preferred geometry eliminates the problems with precipitation of copper oxide at the corners.

It has been found that if the sealing glass be given a rectangular or square cross section, and in certain instances an excess of material at the corners, the need to weld to form preform frames is eliminated. This in turn eliminates the corner precipitation problem. Good wetting and bonding to the underlying glass is obtained by cleaning the glass seal with the following procedure: 30 sec. 1% Perchloric acid 2 min. Rinse in DI water 3 min. 1% ammonia 2 min. Rinse in DI water.

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