| 摘要 |
PURPOSE:To transmit an encoded optical pulse signal as keeping its high quality state by providing an optical pulse signal generating device with a transmission correcting means, which detects light attenuation quantity in a spatial transmission path, and regulates the output of the optical pulse signal generating device. CONSTITUTION:The terminal tm of the light receiving element 117 of a light receiving part 113 is connected to the bases of driving transistors (TRs) 123, 124 through resistors. Accordingly, in a state that the transmitting condition of the transmission path 118 changes and an infrared ray passing through the transmission path 118 attenuates, a voltage signal given to the bases of the driving TRs 123, 124 from the terminal tm of the light receiving element 117 is small, and the driving TRs 123, 124 are in an interrupted state. Therefore, because the resistor 120 and the resistors 125, 126 connected to contacts 121-A, 122-A in series respectively are connected in parallel with each other and a resistance value decreases, a large current is supplied to the TR 43 of the optical pulse signal generating device 9, and the light emitting quantity of a light emission diode 47 is increased. |
