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:
Aug. 16, 1988
Filed:
Jun. 26, 1987
Applicant:
Inventor:
Kirk Oliver, Forest Park, IL (US);
Assignee:
Zenith Electronics Corporation, Glenview, IL (US);
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315370 ; 315371 ;
Abstract
A top/bottom pincushion correction circuit includes a multiplier having a gain control input coupled to a differential amplifier, one input of which is a ground potential and the other of which has a voltage dependent upon the B+ voltage supplied to the horizontal deflection system. A voltage divider is connected between the B+ voltage and a zener diode that provide a reference potential. Changes in B+ voltage are indicative of changes in the horizontal raster size and result in a compensating current being supplied to the gain control input of the multiplier which develops a corresponding change in pincushion correction signal amplitude.