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:
May. 20, 2003
Filed:
Nov. 14, 2001
Matsushita Electric Industrial Co., Ltd., Kadoma, JP;
Abstract
A cathode ray tube includes a pair of plate members ( ) facing each other, a pair of supporters ( ) adhered to the respective plate members ( ) to support the plate members ( ), and a shadow mask ( ) adhered to the respective plate members ( ) while being applied with tensile force. The supporters ( ) have crank-shaped steps ( ) formed to protrude toward the shadow mask ( ). Thereby, an internal moment of a shadow mask structure can be decreased, and thus, displacement of the shadow mask ( ) in the axial direction is suppressed even when the shadow mask ( ) is expanded by heat generated by impact of electron beams, and q-value deviation is suppressed as well. Moreover, since the crank-shaped steps ( ) are helpful in blocking a transverse clearance with a ferrous material, the magnetic properties can be improved.