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. 31, 1988
Filed:
Dec. 08, 1986
Leendert J Noordermeer, Eindhoven, NL;
U.S. Philips Corporation, New York, NY (US);
Abstract
Coma correction means is provided in a color display tube including an evacuated envelope (1) containing an electron gun system (5) of the 'in-line' type to generate three electron beams (6, 7, 8) situated with their axes in one plane. The electron beams converge on a display screen (10) provided on a wall of the envelope and are deflected over the display screen in two mutually perpendicular directions by means of a first and a second deflection field. The first deflection field is parallel to the plane. The electron gun system includes at its end field shapers (34, 35) for causing the frames described on the display screen by the electron beams to substantially coincide the field shapers include substantially annular elements (34) of a material having a high magnetic permeability around the two outermost beams. Two elongate flat strips (35) of a material having a high magnetic permeability are provided symmetrically with respect to the axis (37) of the central beam and the plane through the beam axes. Each strip has a longitudinal axis (L) substantially perpendicular to the plane, intersecets the plane extends with its a width axis (B) in the direction of the display screen (10), and has a recess (38) adjacent the central beam aperture (32).
Data source: USPTO (United States Patent and Trademark Office) public patent records. Weekly synchronization. How IDiyas builds this profile