Patent ID: 6720721
Filing Date: 2004-04-13
Classification: H01J

Abstract:
A color cathode ray tube comprisingan evacuated envelope including a generally rectangular shallow dish-like panel portion having a peripheral skirt portion, a tubular neck portion, and a funnel portion for connecting said panel portion and said neck portion, an electron gun housed within said neck portion, a phosphor screen formed on an inner surface of said panel portion, a shadow mask structure closely spaced from said phosphor screen within said panel portion, said shadow mask structure comprising a generally rectangular peripheral support frame, a generally rectangular shadow mask having an apertured portion formed with a multiplicity of electron-transmissive apertures and a peripheral skirt portion, said shadow mask being attached at said peripheral skirt portion thereof to said support frame, and suspension springs attached to corners of said support frame corresponding to said corners of said panel portion, and a plurality of studs embedded in an inner wall of said skirt portion at corners of said panel portion for supporting said shadow mask structure, wherein each of said suspension springs comprises a base member fixed to a corresponding one of said corners of said support frame, and a spring member fixed at a panel-portion side end thereof to said base member; and said spring member includes a resilient sloped portion extending in a direction of a longitudinal axis of said color cathode ray tube from said panel-portion side end of said spring member, and bent toward said skirt portion of said panel portion from the direction of the longitudinal axis of said color cathode ray tube, an engagement portion formed with an engagement hole engaged with a corresponding one of said plurality of studs, and a generally step-like portion provided between said resilient sloped portion and said engagement portion for protruding said engagement portion toward said corresponding one of said plurality of studs such that a center of said engagement hole in a condition thereof engaged with said corresponding one of said plurality of studs is displaced toward said inner wall of said peripheral skirt portion of said panel portion from an intersection of a longitudinal axis of said corresponding one of said plurality of studs with an imaginary plane projected from said resilient sloped portion.