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:
Nov. 10, 1981
Filed:
Feb. 11, 1980
Richard W Midland, Inverness, IL (US);
Zenith Radio Corporation, Glenview, IL (US);
Abstract
This disclosure depicts means for providing greater spot size uniformity across the screen of cathode ray picture tubes. A beam-current-control signal is derived from the horizontal scansion circuit means in which the amplitude of the signal varies monotonically as a function of the distance of the beam spot from the minor axis of the faceplate. Means for receiving the beam-current-control signal for modulating the luminance signal are provided. The beam-current-control signal has such characteristics that the modulation causes a predetermined gradational reduction in beam current at least from the minor axis to the minor sides of the faceplate to inhibit beam spot enlargement in faceplate side zones and thus provide greater spot size uniformity across the screen.