Patent ID: 6825599
Filing Date: 2004-11-30
Classification: H01J

Abstract:
A color CRT (Cathode Ray Tube) comprising:a panel having a luminescent screen on an inner surface thereof; a funnel connected to the panel; an electron gun mounted on a neck part of the funnel, the electron gun emitting electron beams toward the luminescent screen; a shadow mask disposed in a fixed interval to the luminescent screen formed on the inner surface of the panel, the shadow mask serving to select colors; and a frame fixing and supporting the shadow mask, wherein the shadow mask includes an effective surface having a plurality of slots and a non-effective surface surrounding the effective surface, wherein the slots includes first slots, said first slots comprising each outermost slot of adjacent vertical columns of slots, and wherein a minimum length of the vertical axis direction of the first slots is greater than 63% of a maximum length of the vertical axis direction of the first slots, all of said first slots having an outer edge portion thereof connected to and extending from an edge of an effective area of the shadow mask.