| 摘要 |
PURPOSE:To judge whether a device has a fault or not when erroneous operation occurs readily and to acknowledge the operation without hardly increasing power consumption, by emitting visible light in synchronization with the transmission by infrared rays. CONSTITUTION:In a light emitting part, an infrared-ray emitting diode D1, which emits infrared rays, and a visible-light emitting diode D2, which emits visible light, are provided. A transistor Q is connected to the light emitting diodes D1 and D2 in series. The transistor Q is turned ON and OFF by a driving part 3. Thus the flash signals of the light beams from the light emitting diodes D1 and D2 are transmitted. The infrared-ray emitting diode D1 is used for a transducer, which transduces the electric signal of the light emitting signal into the optical signal. The visible-light emitting diode D2 for emitting the light in synchronization with the infrared rays is provided. The visible light is emitted at the same time as the signal transmission with the infrared rays. Therefore, whether the device has a fault or not can be readily judged when the light is emitted by erroneous operation. Since the light emitting diode D2 whose power consumption is less is used, consumption of a battery is less. |
