| 摘要 |
<p>PURPOSE:To diagnose the driving state of the whole of flood-light elements by driving the floodlight element in the succeeding stage based on the signal obtained at the time of driving the floodlight element in the preceding stage. CONSTITUTION:Power is supplied to a floodlight element L1 throught an NPN switching transistor TR 2. The base of a PNP switching TR 4 is connected to the collector of the switching TR 2, and the collector of the switching TR 4 is connected to the input terminal of an F/F circuit 3b in the next stage. Consequently, when the switching TR 2 is turned on, that is when the floodlight element L1 emits light, the switching TR 4 is turned on and the driving signal can be applied to the F/F circuit 3b in the next stage. In this case, it is detected whether on not the output of an F/F circuit 3n in the last stage is outputted at prescribed intervals to diagnose whether or not a floodlight 1 normally functions.</p> |
