30.09.1983 US 538001 18.01.1984 US 572088 18.01.1984 US 572089
(71)
Applicant: ZENITH ELECTRONICS CORPORATION
()
(72)
Inventors:
Palac, Kazimir ()
Strauss, Paul ()
Rowe, William A. ()
(54)
Color cathode ray tube and component thereof and method of manufacturing same
(57) O A tensed color selection electrode assembly is utilized in screening a pattern
of phosphor areas upon the target surface of the faceplate of a color cathode ray
tube and is thereafter incorporated as a component of the tube. The faceplate is formed
of a material having a predetermined temperature coefficient of expansion and has
registration affording means thereon. The initial assembly includes a severable mount
formed of a material having a temperature coefficient of expansion greater than that
of the faceplate and has a central opening of a predetermined expanse. 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. First and second frames, each having an overall span less than the mount
opening and each having a central aperture dimensioned to enclose the target surface,
are formed of a material having a temperature coefficient of expansion approximating
that of the faceplate. Each frame further includes a pair of spaced apart sealing
lands with one sealing land of each frame disposed in a confronting relation. Devitrifying
frit disposed between the confronting sealing lands bond the frames and a peripheral
portion of the foil in sandwich fashion to maintain the foil in tension. Indexing
means associated with the other sealing land of the first frame co-operate with the
registration affording means on the faceplate 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.