Patent ID: 6597092
Filing Date: 2003-07-22
Classification: H01J

Abstract:
A shadow mask color cathode ray tube comprising:a panel provided with a shadow mask in its inside; a neck which contains an electron gun for emitting a plurality of electron beams; and a funnel which connects the panel and the neck, the shadow mask having a perforated portion which passes electron beams therethrough, the perforated portion having a plurality of electron beam passing holes each formed of an upper hole provided on a panel side and a lower hole provided on an electron-gun side which are connected to each other, each upper hole located in a central portion of the perforated portion having an aperture diameter smaller than a pitch of adjacent electron beam passing holes, a pitch of electron beam passing holes located in a peripheral portion of the perforated portion being equal to or larger than the pitch of the electron beam passing holes in the central portion, each upper hole located in the peripheral portion of the perforated portion being formed to have an elliptical shape having a longer axis extending in a radial direction of the shadow mask, a shorter axis of the elliptical shape being smaller than a diameter of the upper hole of each of the electron beam passing holes located in the central portion of the shadow mask.