| 摘要 |
<p>PURPOSE:To assure the accurate flashing with out mistake due to other preson's flashlight, by using a transmitter that delivers the flashlight signal of a specific waveform comrising plural waves plus a desired number of receivers that receive the flashlight signals and convert them into plural pulses. CONSTITUTION:When a synchro contact 4 is closed, a thyristor 71 is turned on by the 1st pulse P1 which is delivered from a timer circuit 3. Thus the 1st flashlight tube 61 has flashing. Then the 2nd flashlight tube 62 has flashing by the 2nd pulse P2 delivered from the circuit 3. As a result, a flashlight signal F1 is delivered from a transmitter 1. The flashing of the tube 62 is discontinued at a moment when the signal F1 is reflected by a subject and reaches the proper value of exposure. The signal F1 delivered from the transmitter 1 is received at a phtoelectric element 21 of a receiver 19 and starts the flashing of a flashlight tube 26 for increment of flashlight lamps via an AND circuit 201, etc. On the other hand, the signal of the element 21 discontinues the flashing of the tube 26 via an operational amplifier 22, etc. In such way, the assured flashing is possible with no erroneous flashing.</p> |
