Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1976-11-19
1978-06-20
Hubler, Malcolm F.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
315397, H01J 2970
Patent
active
040964167
ABSTRACT:
In a vertical deflection circuit, a deflection winding is coupled to an output terminal of a deflection amplifier. The amplifier generates a trace current in the winding in response to drive signals coupled to an input terminal of the amplifier. A first voltage source provides an operating voltage for the amplifier. A bidirectional retrace switch couples the output terminal to a second voltage source for providing a greater magnitude voltage for generating a retrace current in the winding. The bidirectional switch has a controlled semiconductor which is responsive to the drive signals for controlling a main conductive path of the switch during a portion of the retrace interval. A variable resistance device, such as a thermistor, coupled in the main conductive path of the switch, provides a low resistance during the retrace interval but provides a high resistance in the event the drive signals bias the controlled semiconductor element into the state for conduction through the main conductive path during a substantial portion of the trace interval.
REFERENCES:
patent: 3109122 (1963-10-01), Cornell et al.
patent: 3402319 (1968-09-01), McDonald et al.
patent: 3428854 (1969-02-01), McDonald
patent: 3816792 (1974-06-01), Spencer, Jr.
patent: 3917977 (1975-11-01), Izumisawa
patent: 3978372 (1976-08-01), Iwabuchi
patent: 3979641 (1976-09-01), Arakawa et al.
patent: 3980925 (1976-09-01), Awata et al.
patent: 4023069 (1977-05-01), Peer
Hubler Malcolm F.
Laks Joseph
Rasmussen Paul J.
RCA Corporation
Whitacre Eugene M.
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