Linear/resonant CRT beam deflection circuit

Details Linear/resonant CRT beam deflection circuit Linear/resonant CRT beam deflection circuit

1984-05-08

1986-05-20

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315387, 315408, H01J 2970

Patent

active

045904081

ABSTRACT:
In a dual mode CRT deflection circuit, a capacitor for effecting rapid retrace of the CRT beam by means of resonant nonlinear operation is selectively shunted such that beam deflection may be linearly controlled. A bidirectional switch preferably comprising a field effect transistor (FET) is connected in parallel with the capacitor which in turn is connected in series with the deflection coil of the CRT with the series combination being driven by an amplifier in response to beam positioning signals. When the bidirectional switch is activated to shunt the capacitor, the deflection control circuit operates in a linear mode; and when the switch is deactivated, the deflection coil of the CRT interacts with the capacitor for resonant nonlinear operation. A comparator circuit is connected to the output of the amplifier and coupled to the bidirectional switch through an optical coupler to activate and deactivate the switch in response to conditions within the deflection control circuit. Two capacitors and associated FET shunting circuits are provided for bidirectional resonant nonlinear operation, with the deflection coil being connected in series between the two capacitors.

REFERENCES:
patent: 3628083 (1971-12-01), Holmes et al.
patent: 3816792 (1974-06-01), Spencer, Jr.
patent: 4100464 (1978-07-01), Ovenden
patent: 4297621 (1981-10-01), Spilsbury
patent: 4404499 (1983-09-01), Ryan
patent: 4491835 (1985-01-01), Aron

Affiliated with

Also associated with

Rating

Linear/resonant CRT beam deflection circuit does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Linear/resonant CRT beam deflection circuit, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Linear/resonant CRT beam deflection circuit will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2110653