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:
Apr. 28, 1998
Filed:
Apr. 19, 1996
Willibrordus AJ.A. Van Der Poel, Eindhoven, NL;
Antonius WF. Van De Heijden, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Color cathode ray tube (1) device having an electron gun (6) of the in-line type for generating three electron beams (7,8,9), a display screen (10) and deflection coils (11) for scanning the electron beams over the display screen. The electron gun includes a main lens part for focusing the electron beams on the display screen, the main lens part comprising main lens electrodes (26, 27) having apertures for passing of the electron beams, at least one of said main lens electrodes comprising two sub-electrodes (26a, 26b) adjacent to each other, each of the sub-electrodes having a central (311, 321) and two outer apertures (312, 322, 313, 323), whereby in operation between the adjacent sub-electrodes an astigmatic quadrupole field is generated. For the central apertures of the sub-electrodes it holds: