| 摘要 |
PROBLEM TO BE SOLVED: To receive infrared rays transmitted from the infrared communication equipment of a communication opposite party without receiving the influence of an obstacle by selecting a light receiving element receiving no influence of an obstacle interrupting infrared rays existing in a space between with the infrared communication equipment of the communication opposite party during data transmission. SOLUTION: The light receiving element receiving no influence of an obstacle interrupting infrared rays existing in a space between with the infrared communication equipment of the communication opposite party is selected during data transmission. Relating to this infrared communication equipment 26, a comparing circuit 7 measures the intensity of the infrared rays obtained by reflecting the infrared rays transmitted from a light emitting element 3 of the equipment 26 by an obstacle interrupting the infrared rays existing in the space between with the infrared communication equipment of the communication opposite party to reach the light receiving elements A1 and B2 of its own station again. A transmission and reception control circuit 10 judges the influence of the interruption of the infrares by the obstacle. A switch 24 selects a light receiving element (A1 or B2) receiving no influence of interruption and a receiving amplifier (A4 or B5) to connect with a demodulation circuit 8. |
