Electric lamp and discharge devices – Cathode ray tube – Envelope
Patent
1989-03-07
1990-12-11
Yusko, Donald J.
Electric lamp and discharge devices
Cathode ray tube
Envelope
313436, 313450, H01J 2946
Patent
active
049773488
ABSTRACT:
A cathode-ray tube (54) includes a bipotential electrode structure (50) that converges the electrons in an electron beam. The bipotential electrode structure includes a cylindrical metallic electrode (56) positioned within a neck portion (66) of an evacuated glass envelope (52) and an electrically resistive coating (58) on an interior surface (60) of the neck portion. The resistive coating has a terminal end (64) positioned adjacent the metallic electrode. An electrically and thermally conductive coating (62) on the interior surface of the neck portion covers the terminal end of the resistive coating and partly overlaps the metallic electrode. The conductive coating functions to prevent electric "punch-through" between the interior and exterior surfaces of the tubular envelope. The conductive coating also allows relatively efficient operation of a beam deflection apparatus.
REFERENCES:
patent: 2545120 (1951-03-01), Swedlund
patent: 3355617 (1967-11-01), Schwartz et al.
patent: 4374344 (1983-02-01), Misono et al.
patent: 4665340 (1987-05-01), Odenthal et al.
patent: 4672276 (1987-06-01), Odenthal et al.
Horabik Michael
Meininger Mark M.
Tektronix Inc.
Winkelman John D.
Yusko Donald J.
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