Tension mask frame assembly for color cathode ray tube

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, whereby a vertical pitch of the plurality of real bridges decreases in a stepwise relation in a direction from a center portion of the tension mask to 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.

A tension mask frame assembly for a color cathode ray tube, comprising:

• a tension mask including a plurality of strips for forming a plurality of slots isolated from each other on a plate at intervals of a predetermined distance;
• 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 plurality of dummy bridges, each dummy bridge extending from a strip of the plurality of strips on at least one side of a corresponding slot of the plurality of slots in a direction toward a strip of the plurality of strips on an opposite side of the corresponding slot and being formed adjacent to the corresponding slot that is defined by a corresponding one of the plurality of real bridges and corresponding adjacent ones of the plurality of strips;
• and
• a frame for supporting edges of the tension mask, the tension mask being partitioned into a plurality of regions in a direction from a center portion of the tension mask to a peripheral portion of the tension mask, whereby a vertical pitch of corresponding ones of the plurality of real bridges of the tension mask decreases in a stepwise relation in a direction from the center portion of the tension mask to the peripheral portion of the tension mask, with each decrease in the stepwise relation corresponding to a corresponding region of the plurality of regions;
• 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.

A tension mask 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, whereby 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 to 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.

A tension mask 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, whereby a vertical pitch of the plurality of real bridges decreases in a stepwise relation in a direction from a center portion of the tension mask to 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.

A tension mask assembly for a color cathode ray tube, comprising:

• a tension mask including a plurality of strips for forming a plurality of slots isolated from each other on a plate at intervals of a predetermined distance;
• 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;
• and
• a plurality of dummy bridges, each dummy bridge extending from a strip of the plurality of strips on at least one side of a corresponding slot of the plurality of slots in a direction toward a strip of the plurality of strips on an opposite side of the corresponding slot, and being formed adjacent to the corresponding slot that is defined by a corresponding one of the plurality of real bridges and corresponding adjacent ones of the plurality of strips, the tension mask being partitioned into a plurality of regions in a direction from a center portion of the tension mask to a peripheral portion of the tension mask, whereby a vertical pitch of corresponding ones of the plurality of real bridges of the tension mask decreases in a stepwise relation in a direction from the center portion of the tension mask to the peripheral portion of the tension mask, with each decrease in the stepwise relation corresponding to a corresponding region of the plurality of regions;
• 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.