Patent ID: 6639345
Filing Date: 2003-10-28
Classification: H01J

Abstract:
A color cathode ray tube comprising:an evacuated envelope including a panel having an approximately rectangular shape formed by long sides and short sides and having an inner surface curved with an equivalent radius of curvature smaller than that of an outer surface as well as a phosphor screen formed on the inner surface, a neck accommodating an electron gun, and a funnel connecting the panel and the neck; and a pressed mask having an apertured region disposed close to the inner surface of the panel and having a curvature curved to become convex toward the phosphor screen and multiple slots formed to be connected by bridges in their long-length directions, wherein letting Rd (mm) be the equivalent radius of curvature of the outer surface of the panel in a diagonal direction thereof in the effective region of the phosphor screen and letting V (inch) be an effective diameter of the phosphor screen in a diagonal direction thereof, Rd&gE;10(42.5V+45.0), â€ƒthe optical transmissivity of the panel being 60% or less, â€ƒthe opening rate per unit area of the slots in the pressed mask being larger at an end of the apertured region in the diagonal direction than the center of the apertured region, and â€ƒwhere B1>B2, letting B1 be the connected-slot space width of each of the bridges in the center of the apertured region of the pressed mask and letting B2 be the connected-slot space width of each of the bridges at the end of the apertured region in the diagonal direction.