Resistive, adhesive-primer coating for a display apparatus and m

Details Resistive, adhesive-primer coating for a display apparatus and m Resistive, adhesive-primer coating for a display apparatus and m

1992-03-18

1994-04-05

Yusko, Donald J.

Electric lamp and discharge devices

Cathode ray tube

Envelope

313313, 220 21R, H01J 2900

Patent

active

053008561

ABSTRACT:
A display apparatus comprises a CRT having an evacuated envelope including a faceplate with a luminescent screen on the interior surface thereof. An electron gun is disposed within a neck of the envelope for generating and directing at least one electron beam toward the screen. A funnel connects the neck of the envelope with the faceplate. A deflection yoke is disposed around the envelope at the junction of the neck and the funnel. The yoke is attached to the envelope with an adhesive. The envelope further includes a first conductive coating on the interior surface of the funnel, a second conductive coating on at least a portion of the exterior surface of the envelope, and a third coating on the exterior surface of the envelope underlying the yoke and connected to the second conductive coating. The third coating provides a resistive, adhesive-primer coating that acts as a barrier between the yoke adhesive and the envelope and has a composition consisting essentially of a polychloroprene latex, a conductive filler material selected from the group consisting of carbon black and graphite, and water.

REFERENCES:
patent: 3383000 (1968-05-01), Powell et al.
patent: 3621318 (1971-11-01), Lewinson
patent: 3746904 (1973-07-01), Torre
patent: 4217521 (1980-08-01), Dietch et al.
patent: 4564786 (1986-01-01), Baum et al.
patent: 4988915 (1991-01-01), Zegers
RCA Technical Note 1290, mailed Jan. 21, 1982.

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