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. 09, 2001
Filed:
Aug. 18, 1998
Makoto Natori, Kanagawa, JP;
Yasunobu Amano, Tokyo, JP;
Sony Corporation, Tokyo, JP;
Abstract
In an inline 3-beam system color cathode-ray tube, an inline 3-beam system color cathode-ray tube electron gun is able to uniformise shapes of beam spots of three electron beams on the right and left end portion of a fluorescent screen as much as possible. In an electron gun (,) in which focusing electrodes (,), (,) are divided by four to provide at least a first focusing electrode (,A), a second focusing electrode (,B), a third focusing electrode (,C), a fourth focusing electrode (,) and a quadrupole lens action formed by the third focusing electrode (,C) and the fourth focusing electrode (,) is controlled by a quadrupole lens formed by the first focusing electrode (,A), the second focusing electrode (,B) and the third focusing electrode (,C), in the first focusing electrode (,A), the second focusing electrode (,B) and the third focusing electrode (,C), openings corresponding to right and left electron beams R, B have different aspect ratios in adjacent focusing electrodes of the first focusing electrode (,A), the second focusing electrode (,B) and the third focusing electrode (,C), and the aspect ratio of the openings is set in such a manner that a major diameter/minor diameter is greater than 1.05.