Devices are formed on a semiconductor wafer in an interdigitated relationship and are released by deep reactive ion etching. A passenger identification code identifies a passenger, a trip starting location, and both a carrier and a final destination. On the other hand, the rotational speed is increased when the read or write margin becomes greater than or equal to a second predetermined value or, when the frequency of generation of the servo abnormality of the tracking servo andor the focus servo is less than or equal to a second predetermined frequency. The first matrix-region has a high resistivity, and the electrically-conductive region is positioned operatively adjacent the second matrix-region. By adjusting the received visible light reflected from the diffusion unit, the frame demonstration medium generates a virtual image corresponding to the real image.