| 摘要 |
PURPOSE:To control accurately the drive of a hot cathode and to reduce greatly the power consumption, by connecting an end of a series circuit including a linear cathode and a diode at the middle point of each of push circuits forming two sets of transistor rows. CONSTITUTION:The vertical driving pulses are applied to the bases of transistors TR45a-45o and TR46a-46o, and the TR45a-45o and TR46a and 46o are cut off while the pulse is kept at a low level with conduction of TR44a-44o respectively. In this case, heat cathodes 2a-2o have positive potential, and no electron beam is produced. While the TR45a-45o and TR46a-46o conduct while the vertical driving pulse is kept at a high level; and the TR44a-44o are cut off since the collectors of TR46a-46o are set at a low level respectively. Thus a minus power supply -B2 is applied to linear cathodes 2a-2o via the TR45a- 45o, and diodes 43a-43o are cut off. In this case, the cathodes 2a-2o are set at a low potential during a pulse period. Then electron beams are generated with a uniform distribution. |
