Electric lamp and discharge devices: systems – Cathode ray tube circuits – Cathode-ray deflections circuits
Patent
1978-03-30
1979-10-02
Hubler, Malcolm F.
Electric lamp and discharge devices: systems
Cathode ray tube circuits
Cathode-ray deflections circuits
H01J 2970
Patent
active
041699890
ABSTRACT:
A circuit arrangement for providing a saw-tooth current, with trace and retrace (flyback) intervals, in a deflection coil, in which the amplitude of said current is affected by modulation signal, the arrangement comprising in addition to the said deflection coil, a first retrace capacitor and a first trace capacitor which, together with the deflection coil, form a first oscillating circuit during the retrace interval, a second inductance coil, a second retrace capacitor and a second trace capacitor which form a second oscillating circuit during the retrace interval, a controllable switch connected to a power supply source through a third inductance coil and having a control electrode, connected to a periodic signal source for making the controllable switch conductive during a second part of the trace interval, and a first diode and a second diode, connected in parallel with the first and second retrace capacitors, respectively, the polarity of the diodes being such that they are made conductive by current flowing in the deflection coil and in the second inductance coil, respectively, during the first part of the trace interval, the first retrace capacitor being connected to the controllable switch through a third diode and the second retrace capacitor being connected to the controllable switch through a fourth diode, the third diode being connected with polarity such that it is made conductive by the current flowing in the deflection coil during the second part of the trace interval and the fourth diode being connected with polarity such that it is made conductive by the current flowing in the second inductance coil during the second part of the trace interval.
REFERENCES:
patent: 3767960 (1973-10-01), Ahrens
patent: 3912972 (1975-10-01), Otten et al.
patent: 3950674 (1976-04-01), Joosten et al.
Hubler Malcolm F.
Indesit Industria Elettrodomestitici Italiana S.p.A.
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