Patent ID: 6744193
Filing Date: 2004-06-01
Classification: H01J

Abstract:
In a cathode ray tube including a panel having a fluorescent surface coated onto the internal surface and a funnel comprising of a body portion connected to the panel, a yoke portion at which a deflection yoke is installed and a neck portion at which an electron gun is installed, a funnel structure for a cathode ray tube satisfies the equations0.33&lE;Rhmaj/Rmaj&lE;0.51 andRhmaj=Hmaj/Umaj, Rmaj=amaj/bmaj wherein a length of a major axis evaluation line as an imaginary line connecting the major axis outer end of a sealing surface, at which a panel meets a funnel, with the major axis outer end of a TOR (top of round), at which a body portion meets a yoke portion, is defined as bmaj; a length from a point on the major axis evaluation line, which has a maximum vertical line length to the outer surface of the funnel, to the major axis outer end of the sealing surface is defined as amaj; a maximum length of the vertical line is defined as Hmaj; and Â½ of a major axis length of an effective surface of the panel is defined as Umaj.