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. 27, 1986
Filed:
Mar. 21, 1984
Applicant:
Inventor:
Masamichi Kimura, Ibaraki, JP;
Assignee:
Matsushita Electronics Corporation, Kadoma, JP;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ; H01J / ;
U.S. Cl.
CPC ...
315 16 ; 313449 ;
Abstract
An electron gun has five grids (G.sub.1, G.sub.2, G.sub.3, G.sub.4, G.sub.5), and an additional grid (G.sub.2s) is disposed between the second grid and the third grid (G.sub.3) and is impressed with a potential lower than that of the second grid (G.sub.2), and a trimming electrode (G.sub.5a) with a trimming aperture 14 is provided in the fifth grid (G.sub.5), and by trimming the outer shell part of the electron beam having crossed the electron gun axis twice a very small beam spot is produced.