A data processing system comprises a memory for temporarily storing data, a storage for storing data and a controller for storing the data into the memory by a predetermined unit at a time and storing the data stored in the memory into the storage by the predetermined unit at a time. Alternatively or in addition, the separate member may provide a mounting for a tension bar to increase the lifting capacity. Two groups of electrode bars are preferably used which are interlocked with one another in an alternating comb-like manner, which, are separate from one another, and are interconnected at the ends thereof in an electrically conductive manner, and which are anchored on the substrate. The bowed sheets do not sag against the printer, which aids in sheet registration. The polarizer film has a transmission axis inclined toward either the first polarization direction or the second polarization direction. Furthermore, it allows waveguides to be formed of a glassy material having a similar refractive index and core dimensions to that of a fibre A high refractive index contrast within the photonic crystal region is used while totally eliminating the need for mode conversion to launch light in and out of the waveguide .