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:
Dec. 08, 1998
Filed:
Aug. 22, 1997
Hitachi, Ltd., Tokyo, JP;
Abstract
A color cathode ray tube has an evacuated envelope including a panel portion having a phosphor screen and a neck portion, and an in-line electron gun including a main lens and an electrostatic quadrupole lens and housed in the neck portion. The focus electrode of the main lens has a single opening at its one end for the three electron beams. The single opening has a diameter larger than a horizontal direction than that in a vertical direction. A distance from the main lens to the phosphor screen is not larger than 300 mm, an outer diameter T of the neck portion satisfies the following inequality: 23.2 mm.ltoreq.T.ltoreq.25.9 mm, and a value D of twice a distance from the side electron beams to a vertical edge of the single opening satisfies the following inequality: 50 mm.ltoreq.D.ltoreq.6.5 mm.