| 摘要 |
PURPOSE:To execute easily a long distance transmission by using an output as an optical signal, by providing two light emitting elements and one photodetector, and driving the second light emitting element by synchronizing with an output of a transmitter for driving the first light emitting element by a prescribed pulse, and also in accordance with a photodetecting signal of the photodetector. CONSTITUTION:A reference signal P0 of a reference transmitter 8 of 1-100kHz oscillation frequency and <=40% duty ratio is applied to a driving circuit 9 of a light emitting element 2, and also supplied to a driving circuit 15 of a light emitting element 3 through a gate 11. Also, a signal of a photodetector 4, and the signal P0 are supplied to a gate 10 through an amplifier 12 and a switch 6, respectively, and its output S2 is supplied to contacts C, A of a switch 7 as signals S6, S3 passing through a monostable multivibrator 16 and a signal confirming circuit 13. Subsequently, when the switch 6 is turned on, and the switch 7 is set to the contact A side, the element 2 emits light by the signal P0, also the signal P0 passes through from the gate 11 by a signal of the circuit 13 by a signal photodetected by the element 4, and the element 3 emits light. |
