In one embodiment, an apparatus comprises a network interface system having at least one input port configured for receiving frames and a logic system comprising at least one logic device. The air current rectifying mechanism is positioned with a surface that is substantially parallel to an end surface of the rotary polygon mirror. These spacer structures facilitate enlargement of panels by increasing the supporting strength while maintaining a high aspect ratio. In addition, a user may set paste preferences to determine which of the source information, if any, in the second field is incorporated into a citation to the source of the information when the information is pasted into another document. With this liquid crystal cell substrate, a liquid crystal cell excellent in the long-term stability of display quality can be fabricated.