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. 06, 2003
Filed:
Jul. 21, 2000
Roger Casanova Alig, Princeton, NJ (US);
Dennis John Bechis, Yardly, PA (US);
David Arthur New, Mercerville, NJ (US);
Other;
Abstract
A cathode ray tube and a plural beam electron gun therefor include a main lens that comprises a tubular focus grid G and a conductive coating on the inner surface of the tube neck. The neck coating extends from the region of focus grid G towards the faceplate of the cathode ray tube. Preferably, the exit of the focus grid G is non-planar and is curved or undulated and focus grid G includes an aperture plate intermediate its entrance and exit. The aperture plate preferably has an elliptical center beam opening and connected-semi-elliptical outer-beam openings, to better converge and focus the outer and center electron beams. Also preferably, the focus grid G is centrally located in the tube neck and at least partly surrounded by the conductive neck coating.