| 摘要 |
PROBLEM TO BE SOLVED: To provide a radio card system which can display process information on a radio card without using any dedicated large-capacity power source and has more additional value and is more convenient. SOLUTION: On the top surface of the radio card 1, a display part 3 using a liquid crystal display panel and a solar battery 4 which transduces light energy into electric energy are provided. A radio card reader writer 2 has an antenna 5 for radio communication with the radio card 1 and information is communicated through the antenna 5. This radio card 1 has no power source, so the electric power needed for the communication is supplied through the antenna 5. The radio card reader writer 2 is provided with a light source 6 and the solar battery 4 is irradiated with the light from the light source 6 for the communication with the radio card 1, so that the electric power is obtained from the solar battery 4. The electric power generated by the solar battery 4 is used to drive the display part 3. |
