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:
Apr. 24, 2001
Filed:
Jul. 06, 2000
Applicant:
Inventors:
Assignee:
Hitachi, Ltd., Tokyo, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J 2/907 ;
U.S. Cl.
CPC ...
H01J 2/907 ;
Abstract
In order to prevent doming effect in a shadow mask of a color cathode ray tube caused by thermal expansion of the shadow mask structure produced by heating of the shadow mask due to impingement of the electron beam thereon, the shadow mask is provided with a skirt portion along at least one side thereof. The skirt portion includes a long projection portion where the shadow mask is welded to the frame, an adjacent inclined portion which decreases in length in a direction away from the projection portion. Further, a short portion is disposed therebetween the inclined portion. The inclined portion decreases in length linearly or non-linearly.