Patent ID: 6724137
Filing Date: 2004-04-20
Classification: H01J

Abstract:
A tension mask frame assembly for a color cathode ray tube, comprising:a tension mask formed on a plate, the tension mask including a plurality of strips and including a plurality of slots to separate, by a predetermined distance, corresponding adjacent ones of the plurality of strips; a plurality of real bridges for respectively partitioning corresponding slots of the plurality of slots at a predetermined pitch interval by connecting adjacent ones of the plurality of strips; a frame for supporting the tension mask, wherein a vertical pitch of the plurality of real bridges in a center portion of the tension mask is greater than a vertical pitch of the plurality of real bridges in a peripheral portion of the tension mask; and a plurality of dummy bridges, each dummy bridge being formed adjacent to a corresponding slot partitioned by a corresponding one of the plurality of real bridges; wherein a value M is obtained by dividing a vertical pitch of corresponding ones of the plurality of real bridges by a vertical pitch of corresponding ones of the plurality of dummy bridges, and wherein the value M decreases in a stepwise relation in a direction from the center portion of the tension mask to the peripheral portion of the tension mask.