Patent ID: 6307310
Filing Date: 2001-10-23
Classification: H01J

Abstract:
A color cathode ray tube comprising a glass valve with a panel portion and a funnel portion as well as a neck portion being integrated together, a phosphor film formed on the inner surface of said panel portion, an electron gun disposed at said neck portion for generation of an electron beam toward said phosphor film, a perforated molded mask disposed adjacent to said phosphor film and having a plurality of holes for allowing an electron beam to reach an individual predetermined position on said phosphor film, a support frame extended so as to surround outer peripheral edges of said perforated molded mask, and an internal magnetic shield having a side wall extending from said support frame along the funnel inner surface, wherein said molded mask has a substantially rectangular shape with long sides and short sides and with rounded corners, said short sides or long sides of said molded mask being inwardly curved with respect to the tube axis, and said support frame having a substantially rectangular shape with long sides and short sides, said long side or said short side of said support frame being outwardly curved with respect to the tube axis, and a dowel being provided at a central portion of said long sides or said short side of said support frame without a dowel being provided at a central portion of said long sides or said short sides of said molded mask.