| 摘要 |
A terminal device having an infrared optical communication circuit (9) with improved efficiency in use of the infrared optical communication circuit (9) and the terminal device itself. In a pocket telephone T as a terminal device, an infrared optical communication circuit (9) includes a light emitting section (10) for emitting infrared rays and a photo detector section (12) for detecting the infrared rays. A controller (2) compares the infrared rays emitted from the light emitting section (10) with the infrared rays which are reflected by a reflecting plate (101) and are detected by the photo detector section (12) and detects the information of infrared ray interruption on the basis of the comparison result. The information of the infrared ray interruption can be transmitted from a radio transmitter-receiver circuit (1) to another terminal device, is output as voices from an audio transmitter-receiver (3), is displayed on a display (6), or is stored in a memory circuit (8), resulting in enabling to detect a movement of a person or substance and improving efficiency in use of the terminal device. <IMAGE> |
