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:
May. 14, 2002
Filed:
Apr. 26, 2001
Noriharu Matsudate, Sanbu-gun, JP;
Yasushi Sawatari, Mobara, JP;
Atsuo Nakagawa, Mobara, JP;
Hidehiro Koumura, Goshogawara, JP;
Hitachi, Ltd., Tokyo, JP;
Abstract
A color cathode ray tube includes a magnetic shield housed in a funnel portion thereof and a deflection device mounted in a vicinity of a transition region between a plurality of electron beams on a phosphor screen. The magnetic shield is configured so as to satisfy the inequality Dcor<Dave, where Dave=(Dverm+Dhorm+Dcor)/3. Magnetic shield-core distances are measured in a section plane containing a longitudinal axis of the cathode ray tube and inclined at a section plane angle &thgr; with respect to a horizontal scanning direction of the plurality of electron beams. Dverm and Dhorm are magnetic shield-core distances measured at section plane angles 0° and 90°, respectively, and Dcor is a magnetic shield-core distance measured in a section plane intersecting a corner of a generally rectangular end of the magnetic shield facing toward an electron gun.