Patent ID: 6577049
Filing Date: 2003-06-10
Classification: H01J

Abstract:
A frame for a color CRT, comprising:a frame having a square shape configured to support a shadow mask; and a plurality of stepped beads having at least two steps formed on corner portions of the frame in order to prevent distortion of the shadow mask, wherein the stepped beads satisfy the equation of 0.1&agr;1&lE;&agr;2&lE; when the overall length of the stepped bead formed on a long side of the frame is &agr;1, the length of the lower step of the stepped bead formed on the long side is &agr;2, the overall height of the stepped bead formed on a short side of the frame is &dgr;1, the height of the lower step of the stepped bead formed on the short side is &dgr;2, and a radius of curvature of the corner portions of the frame is R.