Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1995-10-18
1997-11-18
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315 8, 315 85, 348820, G09G 104, H01J 2906, H04N 565
Patent
active
056891571
ABSTRACT:
A cathode-ray tube display unit provided with a high voltage transformer for supplying high voltage to an anode of a cathode-ray tube, a deflection yoke having a horizontal deflection coil and a vertical deflection coil, and an interior conductive coating formed on the inside of a glass vessel of the cathode-ray tube, in which there is provided an electrode in the conductive coating form formed on an external wall face of a glass vessel at a funnel portion being electrically separated from an exterior graphite coating formed on an external surface of the cathode-ray tube and connected to ground, and a circuit for applying reverse pulse voltage V.sub.1 that satisfies (V.sub.0 .times.C.sub.0)>(V.sub.1 .times.C.sub.1) to the electrode in the conductive coating form is included. Where, it is assumed that flyback pulse voltage supplied to the deflection yoke means is V.sub.0, reverse pulse voltage having a polarity reverse to that of voltage generated in the interior conductive coating is V.sub.1, electrostatic capacity between the horizontal deflection coil and the interior conductive coating is C.sub.0, and electrostatic capacity between the electrode in the conductive coating form and the interior conductive coating is C.sub.1.
REFERENCES:
patent: 5151635 (1992-09-01), Cappels
patent: 5198729 (1993-03-01), Powell
patent: 5218270 (1993-06-01), Haapakoski
patent: 5231332 (1993-07-01), Beaumont et al.
patent: 5449975 (1995-09-01), Madsen
9.1 Cancellation of ELF/VLF Electric Fields from CRt Displays, R.D. Cappels, Apple Computer, Inc., Santa Clara, CA., SID 92 Digest, pp. 137-140.
Jitsukata Hiroshi
Kawakami Katsuyuki
Sakurai Soichi
Satoh Yoshio
Yoshioka Hiroshi
Hitachi , Ltd.
Issing Gregory C.
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