A solid-state imaging device in which the potential of a signal line, which is obtained before a pixel has an operating period, is fixed to an intermediate potential between a first power-supply potential and a second power-supply potential. A fork support is fixed relative to the mast and has a first side and a second side. The lateral side of the main pole of a magnetic head for perpendicular recording may have an inverted tapered shape obtained by forming a groove as a track portion to an inorganic insulating layer and then forming a magnetic layer and then flattening the upper surface. The rational map z is the trapdoor one-way function. Receiving elements for fastening devices are provided at the opening of the component, which fastening devices reach through bearing sleeves fastened to the end of the air conduit.