| 摘要 |
A color selection apparatus for a cathode ray tube includes an iron mask having a longitudinal axis and a short axis and a frame coupled with the mask and tensing the mask in one direction of the longitudinal and short axes. The mask includes a plurality of strips spaced apart from one another at predetermined intervals and a plurality of electron beam through holes formed by a plurality of real bridges arranged between the respective strips at predetermined pitches, wherein a center point of the mask along the longitudinal axis is A, both end points of the mask along the longitudinal axis are B, a length of a longitudinal side of the mask is 2L, point greater than L/4 from the point A in each direction are C, a tension applied to the strip of the point A is smaller than a tension applied to the strips of the points B and a distribution curve of a tension applied to the strips of the mask along the longitudinal direction satisfies the following equation; <paragraph lvl="0"><in-line-formula>|SA-C|<|SC-B|</in-line-formula>wherein SA-C represents a slope of a straight line that links the point A to one of the points C on the tension distribution curve and SC-B represents a slope of a straight line that links the one point C to the corresponding point B on the tension distribution curve.
|
