| 摘要 |
PURPOSE:To allow a restart when a discharge lamp is again connected and dispense with a troublesome action by initiating the control content when one discharge lamp is made the non-connection state while multiple hot cathode type discharge lamps are lighted in parallel. CONSTITUTION:When one discharge lamp 2 is removed while discharge lamps 2 and 3 are lighted, the signal from (f) is made high, the output of an OR circuit 601 of a load detecting device 6 is made high, the output of a reversing circuit 602 is made low, an oscillation frequency control unit 406 is controlled, a control device 4 is initiated, and this state is maintained. When a normal discharge lamp is fitted as the discharge lamp 2, outputs of detecting devices 51 and 52 are both made low, the output of the OR circuit 601 is made low, the output of the reversing circuit 602 is made high, and the control device again repeats sequences at the time of starting. No troubles and uncomfortableness are given until dim lighting is started. |
