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. 12, 1989
Filed:
Feb. 17, 1987
Applicant:
Inventors:
Masanori Maruyama, Tokorozawa, JP;
Kentaro Oku, Kokubunji, JP;
Masakazu Fukushima, Tokyo, JP;
Shinichi Kato, Mobara, JP;
Mitsuhiro Kurashige, Tachikawa, JP;
Assignees:
Hitachi, Ltd., Tokyo, JP;
Nippon Hoso Kyokai, Tokyo, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
313432 ; 313434 ; 313435 ; 313439 ; 313390 ;
Abstract
In an electromagnetic focusing electrostatic type image pick-up tube the electrostatic deflecting electrodes formed on the inner surface of the tube consist of 2 pairs of electrodes. Each of these electrostatic deflecting electrodes has a zig-zag shape from the electron gun towards the target. This zig-zag shape is twisted in the circumferential direction around the axis of the tube and variation rates of this twist amount are different, depending on the position in the axial direction.