A method for reminding a user of a mobile communication terminal of an event scheduled using a scheduling feature of the mobile communication terminal is provided. The press-contact force is caused to act upon the main shaft. The projection system’s pupil is manipulable with respect to normalized pupil heights by the optical element. The vibration plane is an inclined plane gradually increasing its diameter forward. This constitution can variably control easily and over a wide range a drive voltage applied to one end of the motor coil L according to an externally input control voltage Vref.