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:
Jul. 19, 2005
Filed:
Aug. 20, 2003
Go Uchida, Mobara, JP;
Kenichi Watanabe, Ootaki, JP;
Shoji Shirai, Mobara, JP;
Kazunari Noguchi, Chiba, JP;
Go Uchida, Mobara, JP;
Kenichi Watanabe, Ootaki, JP;
Shoji Shirai, Mobara, JP;
Kazunari Noguchi, Chiba, JP;
Hitachi, Ltd., Chiba-ken, JP;
Abstract
In an electron gun including a cathode, a control electrode, an acceleration electrode Ga focusing electrode Gand an anode, longitudinally elongated concave SL-V which surround an electron beam aperture G-H and have a long axis in the vertical direction is formed at a focusing electrode Gside of the acceleration electrode Gand an electron beam aperture G-BH formed at the acceleration electrode Gside of the focusing electrode Gis formed in a longitudinally elongated shape having a long axis in the vertical direction. Due to such a constitution of the present invention, non-uniformity of the beam spot shape attributed to a deflection quantity can be reduced whereby the optimum focusing can be realized over the whole area of a screen.