An improved sprocket profile for engaging a roller or bush chain smoothly and preventing radial impact with the root of the tooth during engagement. In one embodiment, an information processing apparatus may include a search unit that conducts a search that corresponds to each of one or a plurality of search conditions set in a search folder, and searches for at least one folder element of the search folder. The identity data request includes the first and second identifiers, a protected rendition of the PIN, and an encryption key or other data from which an encryption key is derivable. An insulated gate is disposed on the top surface of the epitaxial layer, overlapping a first portion of the body region.