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:
Oct. 06, 1981
Filed:
Dec. 19, 1979
Trung Le, Austin, TX (US);
International Business Machines Corporation, Armonk, NY (US);
Abstract
An electromagnetic deflection yoke for a cathode ray tube (CRT) stroke display system is operated above its resonant frequency to allow faster writing speeds and the use of a single pair of XY deflection yokes for both position and write deflection. Operation above resonant frequency is accomplished by the inclusion of a second-order feedback network tuned to the frequency characteristics of the deflection yoke and associated shunt capacitance. Differing from prior art systems, the current applied as a feedback signal to an input of the yoke driver amplifier in a closed loop system is directly proportional to actual, instantaneous inductive component of the yoke current and to this component only.