Sutro LLP Cushman Darby & Cushman Intellectual Property Group of Pillsbury Madison &
Color cathode-ray tube having a shadow mask with improved arrays of apertures
 A color-cathode ray tube having a shadow mask with improved aperture arrays. The aperture arrays are spaced at appropriate intervals and are curved to suppress local doming of the effective part of the shadow mask and to prevent electron-beam mislanding from occurring on a phosphor screen. The distance between any two adjacent apertures is expressed as: PH(N)=A+BN.sup.2 +CN.sup.4, where PH(N) is the distance between the (N-1)th and Nth arrays and A, B, and C are fourth-degree functions of a Y-coordinate. The apertures along a long side of the effective part of the shadow mask in a section extending for one-fourth of a width of the effective part of the shadow mask from a short side of the effective part of the shadow mask are inclined in an opposite direction to the apertures within the section and located one-third of a height of the effective part of the shadow mask from the long side. 
Kabushiki Kaisha Toshiba
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inventional additional additional inventional
Masatsugu Kumio Shinji Ichiro Takashi Norio
Inoue Fukuda Ohama Saotome Murai Shimizu