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. 21, 1982
Filed:
Mar. 27, 1980
Applicant:
Inventor:
Richard H Hughes, Lancaster, PA (US);
Assignee:
RCA Corporation, New York, NY (US);
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313414 ; 313458 ;
Abstract
A 3-beam in-line electron gun comprises a pair of tub-shaped lens electrodes, each of which has three in-line apertures in its floor with tubular lips extending from the periphery of the apertures into the tubs. The lips of the lower voltage electrode are longer than the corresponding lips of the higher voltage electrode by an amount designed to either balance out the astigmatism of the fringe focus fields within the tubs or perferably to completely reverse the polarity of the overall astigmatism to at least partially compensate for the astigmatism of a self-converging yoke used with the gun.