| 摘要 |
<p>A cathode-ray tube includes a face panel (12) having a substantially rectangular outer surface (12a) and an inner surface on which a phosphor screen (11) is formed. The outer surface of the face panel is defined by using orthogonal coordinates which has as the origin, a center of the outer surface of the face panel, X-axis, and a Y-axis, and by giving a value of z of an arbitrary point (x,y,z) on the outer surface by means of the following polynomial: <MATH> where i and j are integers of zero or more, and n and aij are coefficients. When coefficients for determining a surface shape of the outer surface of the face panel along the X-axis are represented by a10 and a20, and coefficients for determining a surface shape of the outer surface along in the Y-axis are represented by a01 and a02, the coefficients a10, a20, a01, and a02 are set to satisfy the following relationships: a20/a10 < 0.1 x 10<-><6>, a02/a01 < 0.1 x 10<-><6>. <IMAGE></p> |
