Cathode-ray tube having a shrinkfit implosion protection band wi

Details Cathode-ray tube having a shrinkfit implosion protection band wi Cathode-ray tube having a shrinkfit implosion protection band wi

1991-07-31

1993-06-01

Coles, Sr., Edward L.

Facsimile and static presentation processing

Facsimile

Recording apparatus

358245, 220 21A, H04N 565, H01J 2987

Patent

active

052165132

ABSTRACT:
A cathode-ray tube comprises an evacuated envelope having a faceplate panel with a mold-match line. A luminescent screen is disposed on an inner surface of the panel. The envelope further includes a funnel and a neck portion. The funnel is joined to the panel. An electron gun, for generating and directing at least one electron beam toward the screen, is located in the neck portion. A shrinkfit implosion protection band is fitted on the periphery of the panel to apply a compressive force thereto as a result of the tension of the band. The band includes a double thickness of material, a section of which extends forward of the mold-match line. The band is improved over prior bands by adjusting the effective sectional area of the double thickness portion to a value appropriate to provide deformation compensation to the faceplate panel, thereby maintaining register of the electron beam on the screen.

REFERENCES:
patent: 3708369 (1973-01-01), Bongenaar et al.
patent: 4121257 (1978-10-01), Krishnamurthy
patent: 4701802 (1987-10-01), Omae et al.
patent: 5064394 (1991-11-01), Swank
U.S. patent application, Ser. No. 677,178 filed on Mar. 29, 1991.

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