| 摘要 |
PROBLEM TO BE SOLVED: To improve portability and operability, prevent a clock, etc., from entering a radio part through optical transmission, and perform secure data processing. SOLUTION: In a main body block A, a CPU 14 inputs a transmission indication of a switch 19 through a switch switching detection part 19, reads data out of a memory 13, and optically transmits them to a display block B through a P/D data converter 15, an optical transmitting circuit 16, and an LED 17. In the display block, the sent light from the main body block A is outputted to an LCD 25 through a PD 21, an optical receiving circuit 22, an S/P data converter 23, a parallel data correspondence display unit control part 26, and a control signal generating circuit 27, and displayed on the screen of the LCD 25. |
