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. 25, 2001
Filed:
Jan. 27, 1999
Go Uchida, Mobara, JP;
Shoji Shirai, Mobara, JP;
Shinichi Kato, Mobara, JP;
Masafumi Nagaoka, Sakura, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A color cathode ray tube includes a phosphor screen, an electron beam generating section for generating three in-line electron beams, a focus electrode and an anode. The focus electrode includes a first focus and second focus sub-electrodes on this order from the cathode structure. The first focus sub-electrode has plural vertical parallel plate-like electrodes arranged to sandwich respective beam apertures in an end thereof facing the second focus sub-electrode in a direction of a beam arrangement, and the second focus sub-electrode has plural horizontal parallel plate-like electrodes arranged to sandwich beam apertures in an end thereof facing the first focus sub-electrode in a direction perpendicular to the beam arrangement, one of the first and second focus sub-electrodes is adapted to be supplied with a voltage varying in synchronism with beam deflection. The vertical parallel plate-like electrodes extend into a space defined by the horizontal parallel plate-like electrodes, and a vertical spacing V between the horizontal parallel plate-like electrodes and a gap L between the horizontal parallel plate-like electrodes and the edges of the vertical parallel plate-like electrodes satisfy 0.38≦L/(V/2)≦0.58.