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. 02, 2002
Filed:
Apr. 27, 2000
Masahiro Yokota, Fukaya, JP;
Hiroaki Ibuki, Kumagaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A vacuum envelope for cathode-ray tube comprises a panel having a flat outer surface and a convex curved inner surface, and a substantially rectangular fluorescent screen ( ) with an aspect ratio of M:N is formed in this inner surface. In the inner surface of the panel ( ), the gaps &Dgr;H(r), &Dgr;V(r), and &Dgr;D(r) from the center on the horizontal, vertical and diagonal axes of the fluorescent screen ( ) are determined in a specific relationship. By forming a proper curved surface in the inner surface of a panel ( ) whose outer surface is a flat surface, the strength of the vacuum envelope is maintained, deterioration of visual recognition of flatness is suppressed, and, in the color cathode ray tube, the workability of the shadow mask is further enhanced.