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. 18, 2000
Filed:
Mar. 30, 1998
Masao Hayashi, Shiga, JP;
Kazuya Fushimoto, Kyoto, JP;
Matsushita Electronics Corporation, Osaka, JP;
Abstract
A body of a shadow mask having a skirt portion around the body, wherein cut parts are formed in the skirt portion in the vicinity of corner portions and center portions of the short sides and the length of the skirt portion in the corner portions is longer than the length of the skirt portion in the center portions of the short sides. This enables residual distortion generated during welding with a mask frame and a thermal expansion generated later to be absorbed at the skirt portion, thus restraining the deformation generated by heating a curved surface of the shadow mask. As a result, it is possible to realize cost reduction and to improve productivity in manufacturing a color picture tube without deteriorating the color purity in the color picture tube by preventing the thermal deformation of the curved surface of a shadow mask during manufacturing processes of the color picture tube without a dummy baking process.