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. 19, 1988
Filed:
Dec. 24, 1985
Hidetoshi Yamazaki, Fukaya, JP;
Masatsugu Inoue, Fukaya, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
In a color picture tube in which an electron beam produced by an electron gun passes through apertures in a shadow mask structure and excites a phosphor screen, the shadow mask structure comprises a shadow mask having an electron beam penetration area and a frame portion supporting this shadow mask. The shadow mask is formed of a metal of a lower coefficient of thermal expansion than the frame portion. The shadow mask has its periphery bent to form a skirt portion and the skirt portion is fixed by welding to the frame inner wall. The skirt portion is subject to an inward compressive stress from the frame portion, and by means of this stress deformation during the manufacturing process and during operation is prevented.