| 摘要 |
PURPOSE:To attain the saving of a space and to miniaturize a camera by making a stator constituted of a disk-like piezoelectric element and a fixed electrode for the piezoelectric element abut on the outer peripheral surface of a supporting shaft which is integrally rotated with a main mirror and using the supporting shaft as the rotor for an ultrasonic motor. CONSTITUTION:A supporting member 301 and the stator 304 which is constituted by sticking four-divided electrode 303 on both sides of the disk-like piezoelectric element 302 which is fitted around the supporting shaft 301b are jointly fastened with the side wall 17 of a mirror box by use of an end plate 305 and a bolt 306, and also the end part 308 of the supporting shaft 307 of the main mirror 15 is swollen and projected so as to be brought into contact with the stator 304, and the supporting shaft 307 functions as the rotor. The part on which a positive voltage out of four pairs of electrodes 303 is impressed swells and the part on which a negative electrode is impressed swells and the part on which a negative electrode is impressed contracts in such a way. Then, by successively moving the swelling part of the stator 304, the rotor 308 in contact with the outer peripheral surface is rotated. Thus, the main motor 15 can be driven by making it directly come into contact with the motor, and the camera can be miniaturized. |
