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. 22, 1988
Filed:
Jan. 06, 1987
Kirk Oliver, Forest Park, IL (US);
Zenith Electronics Corporation, Glenview, IL (US);
Abstract
A side pincushion correction circuit develops a vertical rate parabolic signal by multiplication of the vertical ramp by itself. A transistor current source is connected to a gain control terminal of a multiplier and is controlled by the operating voltage developed for the horizontal deflection system. A tilt potentiometer supplies a variable amplitude and polarity voltage to the multiplier. A potentiometer is coupled to the output of the multiplier. The tilted, variable amplitude parabolic signal is coupled to an error amplifier that is differentially supplied with a sinewave signal developed by integrating the parabolic signal. The error amplifier controls the voltage regulator that supplies operating voltage to the horizontal deflection system.