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. 04, 2006
Filed:
Apr. 03, 2002
Applicants:
Yasufumi Wada, Takatsuki, JP;
Toshihiro Daimon, Katano, JP;
Inventors:
Yasufumi Wada, Takatsuki, JP;
Toshihiro Daimon, Katano, JP;
Assignee:
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J 29/50 (2006.01); H01J 29/74 (2006.01); H01J 29/70 (2006.01);
U.S. Cl.
CPC ...
Abstract
A color picture tube in which an electron gun emits three electron beams arranged in line, in which the diameter of the spot () at the center of the screen in the in-line direction is smaller than that in the direction perpendicular to the in-line direction when the spot is in a just-focused state. Therefore the shape of the spot () at the periphery of the screen is generally a true circle. As a result, the resolution at the periphery of the phosphor screen is improved, and the more is suppressed.