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:
Mar. 13, 2001
Filed:
Oct. 14, 1997
Applicant:
Inventor:
Masayoshi Misono, Chousei-gun, JP;
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 2/970 ;
U.S. Cl.
CPC ...
H01J 2/970 ;
Abstract
A cathode ray tube includes a phosphor screen, an electron gun having a plurality of electrodes and a deflection device. Magnetic pieces attached to one of the electrodes and disposed in a magnetic deflection field generated by the deflection device are configured such that a magnetic field distribution having a region of a uniform magnetic field with an axial boundary thereof varying with a distance thereof from a tube axis is established to correct deflection defocusing.