Electric lamp and discharge devices – Cathode ray tube – Beam deflecting means
Patent
1988-10-31
1990-07-24
O'Shea, Sandra
Electric lamp and discharge devices
Cathode ray tube
Beam deflecting means
335214, H01J 2970, H01H 500
Patent
active
049437534
ABSTRACT:
Apparatus for reducing net distributed magnetic radiation in front of and all about the outside of a cathode ray tube display device. In such cathode ray apparatus a deflection coil is provided having axially aligned and circumferentially aligned wire segments, relative to the central axis thereof, producing a distributed magnetic field in front of the screen as well as all about the outside of the device which is undesirable. The invention provides a magnetic shunt disposed between the deflection coil and the screen, the shunt comprising a substantially ring-shaped arrangement of magnetically permeable material having its configuration and position relative to the coil optimized to maximize cancellation of the net distributed magnetic field as a selected point in space in front of said screen as well as all about the display device, so as to provide optimized overall magnetic field reduction through the action of the shunt.
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Design of a Ns-Pin Corrected 110.degree. Coty Yokes for CRTs with Very Flat Faceplates, B. B. Dasgupta, SID-12-87, Digest, pp. 332-334.
The Radiating Fields of Magnetic Deflection Systems and Their Compensation, A. A. Sluyterman, 12-1987, SID Proceedings.
International Business Machines - Corporation
O'shea Sandra
Troike Robert L.
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