Patent ID: 6919673

Claim:
A color cathode ray tube comprising: an envelope including a panel with a phosphor screen formed on an inner surface of the panel; an electron gun arranged in the envelope, for emitting electron beams toward the phosphor screen; a shadow mask which is provided facing the phosphor screen and has a number of apertures for selecting the electron beams, the apertures including a plurality of aperture columns arranged substantially in parallel to one another with intervals; and dielectric layers provided on a surface of the shadow mask on a side facing the electron gun and formed in stripes extending substantially in parallel with the aperture columns, the dielectric layers being positioned on both sides of each of the apertures to be charged by irradiation of the electron beams and to form an electron lens for acting the electron beams, the dielectric layers having an average surface roughness of 0.2 μm or less, a dielectric constant of 3 or more, and a volume resistivity of 1.0E+12 to 1.0E+15 Ω·cm.