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:
Sep. 10, 2002
Filed:
Dec. 29, 1999
Hitachi, Ltd., Tokyo, JP;
Abstract
A color picture tube has a panel which is substantially flat on its outer surface, while an inner surface of the panel is curved, and a shadow mask having a curved plane with a curvature that is greater than that of the curved plane on the inner panel surface. The panel is made of glass, such as a tint material, a ring-like magnet assembly (PCM) for convergence adjustment is provided outside of the neck, a first electromagnetic quadrupole coil is further attached to a portion outside of the neck for causing an electron beam spacing to change or vary in accordance with the deflection angle, and a second electromagnetic quadrupole coil is attached to a deflection yoke. The distance between adjacent ones of three cathodes of an electron gun is determined to be greater than or equal to 6.0 millimeters (mm).