Information system using multi-touch function

A driving device used in an information processing system comprising an information processing device and the driving device:

• the information processing device having a capacitive multi-touch display;
• the driving device serving to cause the information processing device to execute a proper action when the driving device is touched with the multi-touch display;
• the driving device having a base made of an electrically insulating body and a conductive pattern portion disposed at one side surface of the base;
• the conductive pattern portion having an electric charge accumulating portion, a conductive connecting portion and a plurality of touching portions;
• each of the touching portions being made of an electrically conductive body having a touching area of a predetermined dimension that comes into a touched or nearly touched state with the multi-touch display;
• the electric charge accumulating portion being disposed at a part separate from the touching portions on the base;
• the electric charge accumulating portion being made of an electrically conductive body having a surface area larger than a total of the touching areas of the touching portions;
• the conductive connecting portion being made of an electrically conductive body electrically connecting the electric charge accumulating portion and each of the touching portions;
• the touching area of each of the touching portions being set at a value not less than a minimum detection area of the multi-touch display;
• the conductive connecting portion being provided on the base so as to be kept from activating a touching area of the multi-touch display by a capacitive coupling between the touching area of the multi-touch display and itself;
• the electric charge accumulating portion having one surface in a thickness direction thereof provided with a predetermined minimum area for activation such that, when the touching portion comes into the touched or nearly touched state with the multi-touch display, a minimum amount of capacitance change is generated for detection of the touching portion by the multi-touch display;
• and
• the minimum area for activation of the electric charge accumulating portion being set at such a value that enables the electric charge accumulating portion to receive and accumulate electric charges from the multi-touch display through the touching portion and the conductive connecting portion in an amount not less than a specific amount required for the minimum amount of capacitance change of the multi-touch display.