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. 14, 1992
Filed:
Mar. 12, 1990
Applicant:
Inventor:
Takashi Kinami, Mobara, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Hitachi Device Engineering Co., Ltd., Chiba, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313412 ; 313414 ; 420 43 ; 4205841 ;
Abstract
An electron gun for a color cathode-ray tube has cathodes for producing electron beams and a control electrode unit, a focusing electrode unit and an accelerating unit successively arranged in a direction of the axis of the electron gun. One or more of the above-mentioned electrode units is made of an alloy containing 38-50 Wt % of Ni, 16-20 wt % of Cr and the balance of Fe. This alloy may have a thermal expansion coefficient not higher than about 15.times.10.sup.-6 /.degree.C. and or a relative permeability not higher than about 1.5.