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:
May. 04, 1993
Filed:
Dec. 30, 1991
Applicant:
Inventor:
Wayne D Grocki, Libertyville, IL (US);
Assignee:
Zenith Electronics Corporation, Glenview, IL (US);
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H01J / ;
U.S. Cl.
CPC ...
315 85 ; 361146 ;
Abstract
A stray magnetic field cancelling device for a cathode ray tube comprises an elongated member of adjustable length composed of at least two magnetizable metal plates in slidable relationship enveloped by an electromagnetic coil. The device is physically isolated from the yoke a distance effective to exert minimum effect on the yoke deflection fields. Also, the device is oriented transversely to the centerline of the cathode ray tube so as to generate a cancelling magnetic field in opposed relationship with, and transverse to, the stray magnetic field. A simple mechanical adjustment provides for adapting the device to CRTs of varying sizes.