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:
Jan. 28, 1986
Filed:
Jan. 17, 1983
Applicant:
Inventor:
Aart A van Gorkum, Eindhoven, NL;
Assignee:
U.S. Philips Corporation, New York, NY (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
313449 ; 313414 ; 313458 ; 313293 ;
Abstract
A curved, electrically-conductive foil or gauze member is provided in a second cylindrical accelerating electrode of an electron gun for a cathode ray tube. The curvature of the foil or gauze member initially decreases with distance from the longitudinal axis of the electrode, thereby modifying the shape of the field produced by the electrode and minimizing spherical aberration. The curvature preferably varies according to a zero order Bessel function. Spherical aberration can be made negative by adjusting the relative positions of the member and nearby ends of the second and an adjacent first cylindrical accelerating electrode.