Patent ID: 6677702
Filing Date: 2004-01-13
Classification: H01J

Abstract:
A flat type color cathode ray tube comprising:a rectangular panel having an outer surface which is substantially flat and an inner surface which takes a predetermined curvature, the rectangular panel being formed with a skirt part which extends substantially perpendicularly to the inner and outer surfaces; a shadow mask for performing a function of selecting colors of emitted electron beams in the panel; a frame for applying tensioning force to the shadow mask and supporting the shadow mask; a funnel coupled to a rear end of the panel to maintain the inside of the panel under a vacuum pressure; a tubular neck section extending rearward from a rear end of the funnel; an electron gun mounted in the neck section to emit electron beams; and a deflection yoke surrounding a circumferential outer surface of the funnel to deflect electron beams; wherein the panel possesses at a center part thereof a transmittance of 45%Ëœ75%, and the inner surface of the panel possesses an on-diagonal-axis curvature RD which satisfies the following inequality (1): 3.5R&lE;RD&lE;8.0Râ€ƒâ€ƒ(1) where R is a product of 1.767 and a diagonal length of an effective surface along the diagonal axis.