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. 08, 1981
Filed:
May. 24, 1979
Allen P Blacker, Hoffman Estates, IL (US);
Arthur J Ingle, Bartlett, IL (US);
Zenith Radio Corporation, Glenview, IL (US);
Abstract
A television cathode ray picture tube has at least one electron gun for generating at least one electron beam for projecting at least one beam spot on the picture imaging screen of the tube. The gun has a plurality of differently electrically charged electrodes having facing sections comprising juxtaposed walls with coaxially aligned openings therethrough for passage of said beam, said walls defining at least one gap in which is established a beam-focusing electrostatic field. The tube is subject to influences which introduce an undesired distortion of the beam spot to the detriment of the quality of the image projected on the screen. The electron gun is characterized by at least one of the electrode walls being mechanically deformed in the perimeter of its opening to cause the field to be azimuthally asymmetrical about the opening. The mechanical deformation is effective to act on the beam in a sense tending to at least partially compensate for the undesired distortion of the beam spot.