Vertical deflection polarity switching circuit for CRT projector

Details Vertical deflection polarity switching circuit for CRT projector Vertical deflection polarity switching circuit for CRT projector

1997-03-14

1998-08-04

Blum, Theodore M.

Electric lamp and discharge devices: systems

Cathode ray tube circuits

Cathode-ray deflections circuits

315403, 348747, H01J 2970, H01J 2972

Patent

active

057898740

ABSTRACT:
Such vertical deflection polarity switching circuit for CRT projector can be provided that enables external, one-shot operational switching of the vertical deflection polarity. To switch a CRT projector from a hanging type to a floor type, the switching circuit receives a vertical deflection polarity switching signal from an external device, so that an input sawtooth waveform polarity switching circuit will switch the polarity of a V. SAW signal. At the same time as the polarity of the input sawtooth waveform is switched, power-supply switching circuits switch the driving power-supply voltage of a vertical deflection-use output amplifier. Thus, the polarity of voltage waveforms applied to a vertical deflection yoke is inverted. Also, the polarity of vertical deflection and that of vertical-system data of correction waveforms for use in each of output circuits for horizontal deflection convergence focus are switched. Thus, it is possible to switch the vertical deflection polarity without turning off the power supply of an arrangement set nor opening its top cover.

REFERENCES:
patent: 4085425 (1978-04-01), Hamill
patent: 4857998 (1989-08-01), Tsujihara et al.

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