| 摘要 |
PROBLEM TO BE SOLVED: To set a position and a direction for optimum communication in advance. SOLUTION: A control part 1 of a 1st communication device sends a level signal S3 and a level signal S4 for controlling a light emission level to switches 5 and 6 respectively to perform ON/OFF control over them. One of the paths of resistors 8 to 10 is selected through the switched 5 and 6 and an input power source 7 for a voltage Vcc supplies the power of an output signal S5 to a light emission part 2, whose light emission level is determined according to the quantity of a current made to flow thereto. A 2nd communication device is also provided with a light emission part 2, a light reception part 3, and a display part 4 for infrared communication, and the quantity of photodetection of the corresponding photodetection level is displayed with the light emission level. Consequently, the directions and positions of both the communication devices are so adjusted as to enable optimum communication, which is started. |
