Patent ID: 6879092

Claim:
A structure of a slot feature for a shadow mask of a CRT in which, on an assumption that a width at a point of ½ in a vertical direction in a feature of slots for a shadow mask is ‘Sw’, horizontal distances from a virtual vertical straight line passing an apex of a concave portion of a slot at a marginal portion to a protrusion portion formed at both upper and lower sides on the basis of the width Sw line are ‘M’ and ‘N’, and angles having one side inclined in a direction of the protrusion portion from the virtual straight line forming a second side of the angles and passing an apex of an angular protrusion portion formed at an opposite side of the concave portion are ‘P’ and ‘Q’, there are at least one or more mask slots satisfying the following formula: M>0, N>0, P>0°, Q>0°; and wherein one side of the slot is in the form of straight lines intersecting at an angle and the opposite side is in the form of a curved line.