A high-performance lens system includes lens elements of small diameters for projecting enlarged images from light valves ) for forming images by changing reflecting directions of light. It is characterized in that a gas rectification member for rectifying and guiding a gas generated from an inflator up to the vicinity of a part of the airbag, inflating in the initial stage of the expansion thereof, is provided substantially at the central part of the airbag. The screen data identifies the video assets in the video mosaic page. The sacrifice layer etching is conducted in multiple steps. Further, print image data correlated to user identification information corresponding to user confirmation information which is acquired from the destination portable terminal and identifies the originating and destination portable terminals of the wireless communication session carried out between these portable terminals is extracted while referring to the print job database.