Color cathode-ray tube having a shadow mask with improved arrays of apertures

A color cathode-ray tube comprising:

• electron-beam generating means for generating electron beams in in-line fashion;
• a panel having a substantially rectangular effective part which has a curved inner surface;
• a phosphor screen provided on the inner surface of the effective part of said panel, for emitting red, green and blue light rays when excited by the electron beams generated by said electron-beam generating means;
• and
• a shadow mask having a curved, substantially rectangular effective part facing the phosphor screen and having a number of apertures for guiding the electron beams to said phosphor screen,
• wherein said apertures are elongated and arranged, forming a plurality of arrays which extend along a short axis Y of the effective part of the shadow mask and are juxtaposed along a long axis X of the effective part of the shadow mask and the plurality of arrays are curved in different ways, the apertures are inclined at different angles to the short axis Y of said effective part of the shadow mask such that in a first section extending for one-fourth of a width of the effective part of the shadow mask from either of two short sides thereof, the apertures located near either of two long sides of the effective part of the shadow mask are more inclined than those located near the long axis X of the effective part of the shadow mask, and the apertures along either of the two long sides of the effective part of the shadow mask within the first section are inclined in an opposite direction to the apertures within the first section and extending for one-third of a height of the effective part of the shadow mask measured from a respective long side of the two long sides of the effective part of the shadow mask, and for the apertures made in a second section extending for one-third of the height of the effective part of the shadow mask from one of the two long sides thereof, the angle of each of the apertures, measured with respect to a line parallel to the short axis Y, changes from the apertures near the short axis Y of the effective part of the shadow mask to the apertures toward one of the two short sides thereof, the angle of each aperture first increasing gradually to a maximum positive value and then decreasing to one of 0.degree. and a negative value.