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:
Sep. 09, 1980
Filed:
Feb. 12, 1974
Applicant:
Inventors:
Eiichi Yamazaki, Ichihara, JP;
Hiromi Kanai, Mobara, JP;
Masao Taniguchi, Mobara, JP;
Shigemi Hirasawa, Mobara, JP;
Assignee:
Hitachi, Ltd., , JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
313466 ;
Abstract
A phosphor screen for a post-focusing type color picture tube comprising a faceplate, a phosphor layer on the faceplate, a metal back layer on the phosphor layer and a secondary electron emission suppressing layer on the metal backed phosphor screen, in which the thickness of the metal back layer and the density of the secondary electron emission suppressing layer take particular values for effective suppression of emission of secondary electrons from the phosphor screen.