Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1991-06-20
1992-09-29
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 8, 315 85, G09G 104, H01J 2906, H01J 152
Patent
active
051516357
ABSTRACT:
An electric field cancellation system and method for reducing electric fields are presented, especially suited for use in reducing the magnitude of electric field emissions from a CRT display. Signals from the electric field sources of the display are used to generate counter signals of equal magnitude and opposite polarity to the source signals. These counter signals are coupled to a plurality of transmitters which effectively establish a counter electric field, or fields, of opposite polarity to the source fields. The net effect is substantial reduction in the electric field emissions from the display, and a resultant electric field of substantially reduced magnitude encountered by a display operator.
REFERENCES:
patent: 3963975 (1976-06-01), Gauper, Jr. et al.
patent: 4677344 (1987-06-01), Toshiyasu et al.
patent: 4767969 (1988-08-01), Green
patent: 4853588 (1989-08-01), Ohtsu et al.
patent: 5101139 (1992-03-01), Lechter
IBM Tech. Disc. Bulletin, "Cancellation of Leaked Magnetic Flux" vol. 30, No. 12, May 1988 pp. 9-10.
Apple Computer Inc.
Issing Gregory C.
Madsen Stuart J.
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