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. 06, 1990
Filed:
Dec. 18, 1989
Kirk D Oliver, Forest Park, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
Circuits are disclosed for increasing the differential pin-cushion distortion on one of the sides of an image on an CRT and simultaneously decreasing the pin-cushion on the other side of the image. In one embodiment of the invention, the circuit comprises a waveform generator for adjustable producing a repetitive control voltage which is the combination of at least one of a ramping voltage, a parabolic voltage, and a sinusoidal voltage and which has a period generally equal to the vertical rate; and a variable clipper to control the output of an automatic phase controller in the horizontal sweep circuit by modulating the slope of the feedback signal sent to the controller as a function of the repetitive control voltage from the waveform generator.