| 摘要 |
PURPOSE:To prevent generation of a contact failure, etc., to an external device, and to raise the reliability by radiating a light beam from the outside to an optical modulating circuit of the inside of an information card, and reading out information contained in the information card. CONSTITUTION:An information card 20 is inserted into an external device 10. A power transmitting circuit 11 of the external device 10 side converts the power source use power to a transmission medium X1 and supplies it to the information card 20 side, and an electric signal/transmission signal converting circuit 12 converts an input signal Si to a transmission signal S2 and transmits it to the information card 20 side. An optical modulating circuit 27 modulates a light beam from a light source 13 of the external device 10, and its reflected light is demodulated by a demodulating circuit 14, by which information in the information card 20 is read out. |
