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:
Jan. 29, 2002
Filed:
Apr. 13, 2000
Nobuhiko Hosotani, Mobara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A color cathode ray tube having an evacuated envelope including a panel portion, a neck portion and a funnel portion for connecting the panel portion and the neck portion. The panel portion includes a faceplate, a plural-color phosphor screen formed on an inner surface of the faceplate and having a multiplicity of phosphor dots of a plurality of colors. A shadow mask has a multiplicity of apertures therein and spaced from the phosphor screen and a plural-beam in-line type electron gun is housed in the neck portion. The plural-color phosphor screen is configured such that a first horizontal phosphor dot pitch Ph on a horizontal center line of a useful area of the phosphor screen at a first predetermined distance from a center of the useful area of the phosphor screen toward sides of the useful area is less than or equal to 101% of a second horizontal phosphor dot pitch Ph at the center of the useful area, wherein the first predetermined distance is two-thirds of a distance from the center of the useful area to the sides of the useful area. A third horizontal phosphor dot pitch Ph at corners of the useful area is larger than the second horizontal phosphor dot pitch Ph at the center of the useful area and a first vertical phosphor dot pitch Pv at the corners of the useful area is smaller than a second vertical phosphor dot pitch Pv at the center of the useful area.