Videocolor

Antonino Maria Ronzani

Gaetano Caronna

An improved color picture tube (,) has a shadow mask (,) mounted therein in spaced relation to a viewing screen (,) thereof. The mask has a rectangular periphery with two long sides and two short sides. A major axis (X) passes through the center of the mask and parallels the long sides thereof, and a minor axis (Y) passes through the center of the mask and parallels the short sides thereof. The mask has an aperture array (,) that includes slit-shaped apertures (,) aligned in columns (,) that essentially parallel the minor axis and end at a border of the aperture array. The improvement comprises the column-to-column spacing (a,) parallel to the major axis including a pseudo-cyclic variation at least in a portion of the mask, wherein a complete cycle within the pseudo-cyclic variation occurs in the column-to-column spacings between no more than nine consecutive columns.

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Rome, Italy

Antonino Maria Ronzani