| 摘要 |
PROBLEM TO BE SOLVED: To provide a device which can enhance the positioning accuracy of a ultraminiaturized positioning mechanism. SOLUTION: This ultraminiaturized drive device is provided with at least one from among a recording head, a reproducing head and a recording and reproducing head 3. It is composed of a head arm 4 in which a rotation center hole is formed. In addition, it is composed of a shaft 6 which is passed through the rotation center hole in the head arm 4. In addition, it is composed of a piezoelectric vibrator 5, which comes into contact with the head arm and which is moved elliptically by a bend and an expansion and contraction vibration. It is composed of a support member 7 which supports its node. In addition, it is composed of a pressurizing spring 8 which guides and supports the support member 7 and which applies a pressure to a guide member 9 and the support member 7. When an input signal to the piezoelectric vibrator is changed over, the direction of rotation of the ellipitical motion of the piezoelectric vibrator becomes forward and reverse. The head arm is not only rocked around the rotation center hole in the head arm, but the head is rocked. Information, which is recorded in a prescribed position on an information storage medium 1, is read out to be recorded in a prescribed position. By the pressurizing spring 8, an optimum pressurization force for a driving operation is given to the piezoelectric vibrator and the head arm. In addition, a microscopic gap, which is generated between the shaft 6 and the rotation guide hole in the head arm, is eliminated, and the motion of the head arm is made uniform. |
