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. 02, 2007
Filed:
Apr. 29, 2004
Applicants:
Tetsuo Asano, Mobara, JP;
Kenji Kato, Mobara, JP;
Inventors:
Tetsuo Asano, Mobara, JP;
Kenji Kato, Mobara, JP;
Assignee:
Hitachi Displays, Ltd., Chiba-Ken, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 29/89 (2006.01); H01J 29/86 (2006.01);
U.S. Cl.
CPC ...
Abstract
In a projection cathode ray tube device in which a projection cathode ray tube and a projection lens assembly are coupled and held by a coupler, superior focus characteristics and high resolution are realized by eliminating the deviation between the center of the phosphor screen of the cathode ray tube and the center of the lens assembly. In the cathode ray tube, each of the outside and inside surfaces of a faceplate is formed as a spherical convex surface which is curved toward an electron gun.