The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 05, 2001
Filed:
Mar. 10, 1999
Gaetano Caronna, Colleferro, IT;
Antonino Maria Ronzani, Rome, IT;
Videocolor, S.p.A., Anagni, IT;
Abstract
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.