Deflection system
AssigneeMatsushita Electric Industrial Co., Ltd.
InventorsTooru Yasuda, Yoshinori Kitamura, Ryuhei Nakabe
Life of this patent
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Abstract
A deflection system for television cameras or the like. It is provided with a circuit for producing a reference sawtooth wave signal and means for comparing the reference sawtooth wave signal and sawtooth wave current flowing in the deflection coil, whereby the current flowing in the deflection yoke is controlled to give linearity and amplitude desired for the deflection by using a signal obtained from the comparison.
Claims16
A deflection system for generating a deflection current that flows through a deflection coil, comprising:
- detection means, responsive to said deflection current, for generating a detection signal analogous to said deflection current;
- reference signal generating means for generating a reference signal synchronized to the deflection current;
- first circuit means, responsive to both of said detection signal and reference signal, for generating a controlled signal;
- and
- second circuit means for compensating said deflection current in response to said controlled signal.
A deflection system for generating a deflection current by means of the switching action of a switching element connected in a series with a deflection coil, comprising:
- detection means, responsive to said deflection current, for generating a detection signal;
- reference signal generating means for generating a reference signal synchronized to said deflection current;
- comparison circuit means, responsive to said detection signal and said reference signal, for generating a comparison output signal;
- control signal generating means, responsive to said compared output signal, for generating a control signal;
- and
- control circuit means connected in series with said switching element and said deflection coil for controlling said deflection current in accordance with said control signal.
A deflection system for generating a sawtooth wave current that flows through a deflection coil by means of the switching action of a switching element connected in series with a deflection coil, comprising;
- detection means, responsive to the wave-form of said sawtooth wave current, for generating a first output signal;
- first circuit means for generating a reference sawtooth wave voltage synchronized to said sawtooth wave current;
- comparison circuit means, responsive to said first output signal and said reference sawtooth wave voltage, for generating a second output signal;
- second circuit means for generating a compensating signal synchronized to the sawtooth wave current;
- third circuit means, responsive to said second output signal of said comparison circuit means, for controlling the amplitude of said compensating signal to generate a control signal;
- and
- control circuit means for controlling said sawtooth wave current in response to said control signal.
A deflection system for generating a deflection current by means of the switching action of a switching element connected in series with a deflection coil, comprising;
- detection means, responsive to the wave-form of said deflection current for generating a first output signal;
- first circuit means for generating a reference voltage wave analogous to and synchronized to said deflection current;
- second circuit means, responsive to said first output signal and said reference voltage wave, for generating a second output signal;
- third circuit means for generating a compensating signal synchronized to said deflection current;
- fourth circuit means for controlling the amplitude of the compensating signal in response to said second output signal to generate a control signal;
- and
- control circuit means for controlling the amplitude of said deflection current in response to said control signal.
Dependencies are inferred from the claim text.