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:
Dec. 28, 1982
Filed:
Oct. 14, 1980
Applicant:
Inventor:
Piet G Barten, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315382 ; 313414 ;
Abstract
A focusing electron lens having a controllable astigmatism. An auxiliary electrode affects the non-rotationally symmetrical field defined by two tubular electrodes to vary the convergence in one main direction while maintaining it constant in the other main direction. In an in-line electron gun system in a color television display tube, such a lens corrects for the effect of parastigmatic, self-converging deflection coil systems on the focusing of the electron beams.