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:
Nov. 30, 2004
Filed:
Mar. 04, 2003
Naoki Yamauchi, Takatsuki, JP;
Jun Araya, Takatsuki, JP;
Hideo Iguchi, Osaka, JP;
Yoshimi Kumei, Ibaraki, JP;
Masaki Kawasaki, Toyonaka, JP;
Yoko Kannan, Hirakata, JP;
Matsushita Electric Industrial Co., Ltd., Osaka, JP;
Abstract
A color cathode-ray tube includes a shadow mask ( ) stretched and held with tension applied thereto in one direction. The shadow mask is made of an Invar material. A stress generated in the shadow mask by the tension is 32 MPa or more in a range of ±20 mm with respect to a center position of the shadow mask in a direction orthogonal to a direction in which the tension is applied, and is 26 MPa or more outside the range. By stretching the shadow mask under this stress condition, magnetic shield characteristics are enhanced, and mislanding of an electron beam can be reduced. As a result, a satisfactory color image display can be obtained.