(19) |
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(11) |
EP 0 211 963 A3 |
(12) |
EUROPEAN PATENT APPLICATION |
(88) |
Date of publication A3: |
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13.05.1987 Bulletin 1987/20 |
(43) |
Date of publication A2: |
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04.03.1987 Bulletin 1987/10 |
(22) |
Date of filing: 27.09.1984 |
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(84) |
Designated Contracting States: |
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BE DE FR GB IT NL |
(30) |
Priority: |
30.09.1983 US 538003
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(71) |
Applicant: ZENITH ELECTRONICS CORPORATION |
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() |
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(54) |
Color cathode ray tube and component thereof and method of manufacturing same |
(57) A novel color selection electrode assembly is utilized in screening a pattern of
phosphor areas upon the faceplate of a color cathode ray tube. The faceplate, which
is formed of a material having a predetermined temperature coefficient of expansion,
has registration affording means. The aforesaid assembly comprises an auxiliary mount
formed of a material having a temperature coefficient of expansion greater than that
of the faceplate and has a central opening of such span as to enable the mount to
surround the periphery of the faceplate. Index bosses, cooperable with the faceplate
registration affording means, are detachably secured to the mount. A planar metal
foil having a predetermined pattern of apertures and formed of a material having a
temperature coefficient of expansion not greater than that of the mount is secured
to the mount. The index bosses cooperate with the registration affording means on
the envelope to permit repeated precise registrations between the foil and the faceplate
to facilitate screening of the phosphor pattern as well as to facilitate mating of
the electrode assembly to the faceplate. Finally, the invention contemplates a method
of utilizing the electrode assembly for screening a phosphor pattern as well as methods
of making a color cathode ray tube having such an electrode assembly.
