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. 30, 1976
Filed:
Nov. 04, 1974
Stanley E Lehnert, Addison, IL (US);
Zenith Radio Corporation, Chicago, IL (US);
Abstract
A television receiver includes circuitry for processing a received signal and displaying video information therein upon the viewing screen of a cathode ray tube. Conventional horizontal and vertical deflection circuitry provide the required scanning signals. A center tapped winding on the receiver's horizontal output transformer is coupled to a pair of oppositely oriented diodes which are coupled to a common load. A vertical trace or scan signal is applied to both diodes, alternately switching them on during the vertical scan interval. The respective portions of vertical scan signal coupled by each diode are serrated in response to the applied horizontal retrace pulses and when combined in the common load form a train of horizontal frequency pulses having first and second portions at opposite polarities and an envelope corresponding to the vertical scan signal. An amplifier, having a collector load tuned to the horizontal scan frequency, is coupled to the common load and produces a 'bow-tie' signal which is applied to the receiver's vertical deflection amplifier for top and bottom pincushion correction.