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. 29, 2001
Filed:
May. 07, 1999
Martijn J. Dekker, Eindhoven, NL;
Leendert J. Noordermeer, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A cathode ray tube comprises an electron gun for generating electron beams. External magnetic fields influence the electron beams and reduce the picture quality. An electrode of the gun includes a part of a soft-magnetic material, which extends transversely to the electron beams, and two parts, situated to the left and to the right of the electron beams, which extend along the electron beams. Together these parts form a magnetic circuit. Preferably, these parts are strongly magnetically coupled, for example, because they are interconnected or very closely spaced. Interaction of the magnetic circuit formed by the three parts with an external magnetic field causes a Lorentz force on the electron beams. The resultant deviations in the paths of the electron beams largely compensate for the deviations in the paths of the electron beams caused by the effect of the external magnetic field between the electron gun and the display screen.