Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1994-08-03
1996-10-29
Issing, Gregory C.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315403, 348626, G09G 104, H04N 521
Patent
active
055699855
ABSTRACT:
Scanning beam velocity modulation or SVM may be employed to produce subjective enhancement of picture sharpness. However, impulsive SVM deflection current may produce unwanted crosstalk into other circuitry thus a circuit configuration is disclosed where SVM currents are confined. An apparatus for electron beam deflection comprises a cathode ray tube having a scanning electron beam. A coil for supplementary electron beam deflection is mounted on the cathode ray tube. An amplifier is coupled between a supply of power and a return circuit and has an input coupled to a signal representing a video signal edge transition. The amplifier has an output which is coupled to the coil for generating a pulse current therein for electron beam deflection responsive to the signal. The amplifier and the coil are configured for circulation of the pulse current mainly within the coil and amplifier output without substantial pulse current flowing in the power supply and return circuit.
REFERENCES:
patent: 4185301 (1980-01-01), Mitsuda et al.
patent: 5093728 (1992-03-01), Altmanshofer
Copy EPO search report dated Sep. 14 1995, 3 pages.
Best of The Expander vol. 2, pp. 74-79,. Mitsubishi America 1988, Scan Velocity Modulation-Making it Crisp Around the Edges.
Copy Schematic DWG. Toshiba TV Receiver Model CF3254J, Scan Modulator U701, Circa 1993.
Copy Schematic DWG. Toshiba TV Receiver Model 30 ID1, SVM Drive Amplifier PW 6906-2, Pub. Gijutsu Oct. 1988 p. 301.
Copy Schematic DWG. National TV Receiver Model TH29X1, SVM Drive Amplifier TNP10121FZ, Pub. Dempa Shimbun 1990 p. 387.
Davenport Francis A.
Issing Gregory C.
Laks Joseph J.
Thomson Consumer Electronics Inc.
Tripoli Joseph S.
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