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:
Mar. 09, 1982
Filed:
Jun. 30, 1980
Hsing-Yao Chen, Landisville, PA (US);
RCA Corporation, New York, NY (US);
Abstract
An electron gun comprises an astigmatic beam forming means including a cathode, a control grid, a first screen grid electrode having a horizontally elongated rectangular aperture, and a second screen grid electrode having a circular aperture. In operation, the second screen grid is energized with a DC bias voltage and the control grid and first screen grid is energized with a DC bias superposed with a substantially parabolically shaped dynamic signal synchronized with either or both the horizontal and vertical deflection signals. Thus, the astigmatic optics of the beam forming means varies in strength in phase with the beam scan so as to provide optimum correction for flare distortion of the electron beam.