Patent ID: 7224112

Claim:
A color cathode-ray tube, comprising a frame, and a shadow mask stretched on the frame in such a manner that tension is applied to the shadow mask in a vertical direction, wherein the shadow mask includes a plurality of arrays of apertures in the vertical direction, the arrays of apertures include a first aperture, a second aperture, a third aperture, and bridges between the apertures, assuming that a horizontal line passing through a center in the vertical direction of each of the bridges is a horizontal center line, and vertical spacings between the horizontal center lines of pairs of the bridges that respectively sandwich the first aperture, the second aperture, and the third aperture in the vertical direction are P Ba , P Bb , and P Bc in this order, relationships: P Bb =N 1 ×P Ba and P Bc =N 2 ×P Ba (N 1 , N 2 are natural numbers, 1<N 1 <N 2 ) are satisfied, and vertical spacings between the horizontal center lines with respect to all the bridges included in arbitrary pairs of the arrays of apertures adjacent in a horizontal direction are substantially constant.