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. 27, 1984
Filed:
Jul. 01, 1981
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313414 ; 313443 ;
Abstract
An electromagnetic focusing cathode-ray tube in which plural pairs of magnetic material members are arranged within the tube along the tube axis, the magnetic material members in each pair are disposed to oppose each other in the direction of the tube axis with a gap defined therebetween, and the plural magnetic material member pairs and one or more permanent magnet disposed internally or externally of the tube are combined such that magnetic focusing fields having their senses or directions opposite to each other in the direction of the tube axis are formed at the respective gaps associated with the adjacent magnetic material pairs.