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. 01, 1987
Filed:
Jul. 05, 1984
Jan Gerritsen, Eindhoven, NL;
Otto Mensies, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
A display tube comprising an evacuated envelope having a display window, a conical portion and a neck, and an electron gun in the neck for generating an electron beam which is focused to form a spot on a display screen on the display window, the electron beam being deflected over the display screen in mutually perpendicular directions by pin-cushion-shaped deflection fields produced by a system of deflection coils. Field shapers are provided at the gun end of the tube which comprise two mutually perpendicular pairs of flat plates of ferromagnetic sheet material, the respective pairs of plates being arranged coaxially around the electron beam and respectively extending in the respective deflection directions. The plates are supported so that the gun ends thereof are at substantially the same distance from the electron gun, and cause the edge fields of the deflection fields to be barrel-shaped so as to prevent defocusing of the beam by the pin-cushion deflection fields.