The described embodiments provide devices and methods for securing a lens member in a mobile electronic device. In particular, also provided is a crystal of hydrochloride, hydrobromate, sulfate, nitrate, p-toluenesulfonate or methanesulfonate of the compound represented by formula. Work processes are modeled using an application framework used to develop abstract, decision process models. A control circuit board accommodated in the housing controls the motor. The relay part provides a big gear integrally joining a small gear with an axial relay hole to rotationally fit with the relay axle so as to be associated with the tape release part by way of the small gear meshing with the release gear.