Patent ID: 6531813
Filing Date: 2003-03-11
Classification: H01J

Abstract:
A color cathode ray tube comprising at leastan evacuated envelope comprising a panel portion having a phosphor screen formed on an inner surface thereof, a neck portion, and a funnel portion connecting said panel portion and said neck portion, a shadow mask spaced from said phosphor screen and suspended within said panel portion, an in-line type electron gun housed in said neck portion comprising three cathodes, a first grid electrode spaced from said three cathodes and a plurality of electrodes spaced between said first grid electrode and said shadow mask for generating and directing three electron beams toward said phosphor screen, and a deflection yoke mounted in the vicinity of the junction between said neck portion and said funnel portion, said three cathodes being supported within three eyelets, respectively, and each of said three eyelets comprising a large-diameter upper portion facing said first grid electrode, a small-diameter lower portion for supporting said three cathodes and a funnel portion for connecting said large-diameter upper portion and said small-diameter lower portion, and being disposed within and bonded to a tubular cathode support at said large-diameter upper portion thereof by a bonding glass contained within said tubular cathode support, wherein said bonding glass provides a protrusion beyond an upper open end of said tubular cathode support, said protrusion being provided with a depressed step around a top edge thereof.