Patent ID: 6707243
Filing Date: 2004-03-16
Classification: H01J

Abstract:
A color cathode ray tube comprising:an 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 peripheral skirt portion of 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 frame, a generally rectangular shadow mask attached to said peripheral frame and having an apertured portion formed with a multiplicity of electron-transmissive apertures, and suspension springs attached to corners of said peripheral frame corresponding to corners of said panel portion; and a plurality of studs embedded in an inner wall of said skirt portion at said corners of said panel portion for supporting said shadow mask structure; wherein each of said suspension springs comprises: a base member including an electron-gun-side end portion attached to said peripheral frame, a sloped portion extending from said electron-gun-side end portion toward said inner wall of said skirt portion of said panel portion, and a first joint portion extending in a direction of a longitudinal axis of said color cathode ray tube from said sloped portion; and a spring member including a second joint portion fixed to said first joint portion of said base member, a resilient sloped portion extending at a tilt angle &thgr; from said second joint portion of said spring member toward said inner wall of said skirt portion of said panel portion, and a stud-engaging portion extending from said resilient sloped portion, bent from a plane of said resilient sloped portion toward said peripheral frame, and formed with an engagement hole to be engaged with a corresponding one of said plurality of studs, and a length L of said resilient sloped portion satisfies the following inequality: 20 mm&lE;L&lE;an axial length of said frame, and said tilt angle &thgr; satisfies the following inequality: 0Â°&lE;&thgr;&lE;10Â°, where said tilt angle &thgr; is an angle measured in a state where said engagement hole is engaged with said corresponding one of said plurality of studs.