Browse Prior Art Database

Thin Fiber Optic Face Plate Cathode Ray Tube

IP.com Disclosure Number: IPCOM000076191D
Original Publication Date: 1972-Jan-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

Johnson, RB: AUTHOR [+3]

Abstract

This arrangement provides a vacuum tight cathode-ray tube (CRT) with a plastic fiber-optic face plate (FOFP) sealed with a thin piece of mica, permitting a conventional manufacturing process for phosphor deposit, bake out at approximately 450 degrees C, and a high-vacuum tip off of the tube assembly, including the electron gun.

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Thin Fiber Optic Face Plate Cathode Ray Tube

This arrangement provides a vacuum tight cathode-ray tube (CRT) with a plastic fiber-optic face plate (FOFP) sealed with a thin piece of mica, permitting a conventional manufacturing process for phosphor deposit, bake out at approximately 450 degrees C, and a high-vacuum tip off of the tube assembly, including the electron gun.

The CRT is fabricated by applying frit 12 between the glass envelope 14 of the CRT and a flange 16 made of CARPENTER* #49 alloy. Frit 18 is then applied to both the flange and a mica window 20 containing 150 holes around the periphery, with the frit 18 filling the holes. A KOVAR** spacer 22 is placed over the mica window 20 and retained by the flange 16 to prevent contact with the frit. A mica (or other) cover plate 24 is attached to the flange 16 with frit 26.

This whole assembly is then fired in a furnace, fusing the mica pieces 20, 24 to the flange 16 and the flange 16 to the envelope 14. A "hard" vacuum is pulled through the copper tubulation 28 which is then tipped off.

The tube assembly is now ready for adding a plastic fiber-optic face plate 30 to the thin mica window 20. The FOFP 30 supports the window 20 from implosion when exposed to atmosphere. The plate 30 and the window 20 are joined in a vacuum chamber, having a pass-through compartment and manipulators which can be operated from the outside of the chamber.

The tube assembly, along with epoxy and the plastic fiber-optic block 30, i...