| 摘要 |
PURPOSE:To reduce power consumption by revising the inclination of a waveform at two overscanning areas being the start and the end of the scanning of a tooth-shaped deflection waveform. CONSTITUTION:A switching element Q3 is driven by a pulse P3 only for a skip scanning period at the start of beam scanning. In this case, a variable resistor VR1 is connected in parallel with a resistor R3 at the emitter side of a transistor(TR) Q1. On the other hand, a switching element Q4 is driven by a pulse P4 only for a skip scanning period at the end of beam scanning. In this case, a variable resistor VR2 is connected in parallel with the resistor R3. Thus, the inclination of a beam deflection waveform Vo at each of two skip periods being the start and the end of the beam scanning is individually revised by varying the resistance of the variable resistors VR1, VR2. Thus, the entire mesa film is subjected to skip scanning neither too much nor too little, the level of a beam deflection waveform is suppressed to be a required minimum level and the power consumption is reduced. |
