| 摘要 |
PURPOSE:To attain long service life and to save power consumption by receiving/ detecting a power application identification signal so as to apply automatically the power supply of an optical transmitter thereby sending an optical signal and eliminating the need for the use of any manual mechanical switch operation. CONSTITUTION:A power application optical signal A from an optical transmission circuit 2 in an optical transmitter 1 of an opposite party enters an optical reception circuit 5 by space propagation, is converted into an identification electric signal A' and the result is inputted to a signal identification circuit 6. The circuit 6 identifies whether the inputted signal is a power application signal or not and gives an identification output A'' to a switch (SW) drive circuit 7. An intermittent SW drive circuit 8 uses an SW drive pulse C to turn on an SW 121 and to supply an output D of a battery 9 to circuits 5-7 intermittently as the power output E. When a power application identification signal is detected while the power supply is turned on, an SW drive output B turns on the SW 122 and power is supplied to the circuits 5-7. Moreover, the SW 123 is turned on by the SW drive output B, the power output F F is supplied to the signal output circuit 10 and the optical transmission circuit 11 during that time and an optical signal output G' is sent to the optical reception circuit 3. |
