Patent ID: 7098583

Claim:
A slot tension-type shadow mask for a cathode-ray tube (CRT) having a screen, comprising a slot comprising a pseudo-bridge, wherein the pseudo-bridge separates first and second openings of the slot, the openings being arranged in the direction of the tension being applied (which is referred to as the Y-axis direction) such that the first opening is positioned closer to the center of the CRT screen than the second opening, wherein the pseudo-bridge consists of a pair of protuberances that are separated by a lacuna between the two protuberances to connect the first and second openings of the slot, wherein the protuberances extend in the direction substantially perpendicular to the Y-axis direction (which is referred to as the X-axis direction), wherein each protuberance extending in the X-axis direction touches the CRT screen and having at least three portions: a first etched portion at the edge of the first opening but not touching the CRT screen; a second etched portion at the edge of the second opening but not touching the CRT screen; and a third etched portion at the edge of the lacuna but not touching the CRT screen, and wherein the first, second, and third etched portions of each protuberance are shaped in the Z-axis direction (which is substantially perpendicular to Y-axis and X-axis directions) to a predetermined depth so as not to touch the CRT screen, and the shape of the protuberance edge formed in the Z-axis direction to a predetermined depth is referred to as a deviation, and wherein the distance of the first etched portion along the Y-axis direction is longer than the distance of the second etched portion along the Y-axis direction.