A membrane structure comprising a silicon film having a grain structure including grains defining pores therebetween. By displacing the seat, the adjusting gearing permits the linear displacing of the seat part and the swivelling of the seat backrest about a fixed locking point at the vehicle body. The disk includes a plurality of axially extending spacer elements around the disk to engage the undersurface of the base wall and space the disk from the base wall of the shell, and angularly spaced fingers extending from the disk through the central opening of the base wall to retain the disk within the shell. Further, the magnetizing coil is disposed so that the bundles of wires mutually come into close contact along the circumference of the heat generating roller to cover the upper half of the heat generating roller. In cases where the appropriate response is handled by a separate thread, such as a manipulation thread that can be used for touch manipulations such as panning and pinch zooming, manipulation can occur without blocking on the main thread.