An embedded epitaxial semiconductor portion having a different composition than matrix of the semiconductor substrate is formed with a lattice mismatch and epitaxial alignment with the matrix of the semiconductor substrate. The light emitting layer is provided between the first semiconductor layer and the second semiconductor layer and is in contact with the first semiconductor layer. The nip forming unit has a protruding amount at a center toward the pressing member compared to both ends of the nip forming unit in no-load state is set to be less than a bent amount of the nip forming unit when the nip forming unit comes into press-contact with the pressing member with the fixing member interposed therebetween. Therefore, the stopper expands because of its biasing force. The flow path may be entirely annular after striking the impact disc\u2014that is, around the outside of the impact disc but a portion of the flow path may proceed directly through a central aperture in the impact disc after striking it. The device sends, to the client device, a first response based on the determination of the predicted quantity of user devices.