An apparatus and method for dispersing a volatile composition, which comprises dispersing the composition into an air stream and generating an ion wind, thereby causing the molecules of the composition to become electrically charged. The buried barrier layer preferably includes a single or dual p-n junction, or a bubble layer for blocking or eliminating the slow photon-generated carriers in the region where the drift field is low. The sliding-movement restricting member includes an abutting portion and is made of an elastic material. The drive mechanism so configured simplifies the operation of mounting or removing a universal joint onto an output shaft of a vehicle. The processor may be configured according to any one or more different types of bezels.