| 摘要 |
<p>PURPOSE: To know the exhausting of battery in advance without using a power source driving a card main body by providing the solar battery driving a voltage detection means and a display means. CONSTITUTION: In a card main body C', each of a solar battery (solar panel) e and a display device d composed of plural LED lamps d1 to d4 and d1 to d3 is provided. Each reception part in a card C, a CPU and a phase modulation part are driven by receiving the power supply from the battery. When the storage capacity of this battery is reduced, the card C can not be driven. Therefore, the battery is constituted so that the state of the battery may be understood when the solar battery e provided on the card main body C' is exposed to solar ray. Namely, when the solar battery e is irradiated with solar ray in the card C, a voltage detection circuit is driven and the voltage of the battery is detected. The driving circuit inputs the detection value, and turns on a and displays the LED d1 to d3 of the display device d corresponding to the inputted detection value.</p> |
