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:
Jun. 30, 1987
Filed:
Sep. 12, 1985
Applicant:
Inventors:
Masatsugu Inoue, Fukaya, JP;
Hidetoshi Yamazaki, Fukaya, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313402 ; 313408 ; 313303 ;
Abstract
In a color cathode ray tube with a shadow mask shaped as a nonspherical surface, a structure in which the curved surface shape of the effective area of the shadow mask in which apertures through which electron beams pass to a fluorescent screen are formed is made such that, going along the X axis, minimal values of radius of curvature of lines of intersection of the shadow mask and Y-Z parallel planes parallel to the minor axis Y and a central axis which passes through the mask's center and is normal to the mask exist between the center and the edges of the effective area. This prevents local doming.