Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1986-11-21
1988-11-29
Moore, David K.
Electric lamp and discharge devices
Cathode ray tube
Envelope
220 21A, 65152, H01J 2986
Patent
active
047884711
ABSTRACT:
Improved bonding in a cathode ray tube (CRT) between its glass funnel and glass faceplate is achieved by applying a thin base layer of a priming agent to an aft portion of the faceplate adjacent to the periphery thereof as well as to the forward edge of the funnel prior to positioning of the CRT components in contact. An intermediate layer of sealing glass frit is then deposited upon either of the aforementioned layers of the priming agent and adheres to the two priming agent layers without forming a re-entrant geometry. By "priming" the two abutting glass surfaces over an area which extends beyond the area of high loading with the priming agent prior to joining these surfaces, bond integrity is ensured and high stress concentration in the seal is avoided. The sealing glass frit may be comprised of a conventional glass cement paste and is also used as the priming agent in a preferred embodiment. The improved bonding method may also be used to bond a shadow mask support structure to the faceplate's inner surface or other CRT components to each other. Improved CRT components and assemblies made by the disclosed method are also disclosed.
REFERENCES:
patent: Re25791 (1965-07-01), Claypoole
patent: 2735050 (1956-02-01), Armstrong
patent: 2837235 (1958-06-01), Vincent
patent: 2880697 (1959-04-01), Blanding et al.
patent: 2992513 (1961-07-01), Breadner
patent: 3912482 (1975-10-01), La Grouw et al.
patent: 4049872 (1977-09-01), Hang
patent: 4058387 (1977-11-01), Nofziger
patent: 4593225 (1986-06-01), Dietch et al.
Moore David K.
Wieder K.
Zenith Electronics Corporation
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