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. 25, 2005
Filed:
Aug. 24, 2001
Nobuyuki Suzuki, Oohara, JP;
Kotaro Aoki, Mobara, JP;
Kouichi Saitou, Chonan, JP;
Shoji Shirai, Mobara, JP;
Nobuyuki Suzuki, Oohara, JP;
Kotaro Aoki, Mobara, JP;
Kouichi Saitou, Chonan, JP;
Shoji Shirai, Mobara, JP;
Hitachi Ltd., Tokyo, JP;
Hitachi Electronic Devices, Co., Ltd., Chiba-ken, JP;
Abstract
The present invention aims at maintaining the high focusing performance with a low deflection power in a projection tube which is used as a projection type TV receiver or a projector and is operated at a high voltage and with a single-electron-beam high current. A neck outer diameter of a portion on which a deflection yoke is mounted is made smaller than a neck outer diameter of a portion which accommodates an electron gun. A final electrode of the electron gun has a diameter thereof gradually decreased toward a phosphor screen. The maximum anode voltage of the projection tube is set to equal to or more than 25 KV and the maximum beam current is set to equal to or more than 4 mA.