| 摘要 |
PURPOSE:To stop the vibration of lens in a short time when it makes high speed access, by supporting the lens by piezoelectric resin and adjusting the lens position with measuring the voltage generated by the displacement of the piezoelectric resin. CONSTITUTION:Inside a supporting frame 22 of an objecting lens driving device 20, a supporting axis 23 is supported by piezo element 24a-24d as piezoelectric resin; and bimorph elements 25, 26 are extended from upper and lower side of the supporting axis 23, and a supporting frame 27 which holds an objective lens 8 is attached onto them. At the time of high speed access, a voltage signal is detected at the piezo elements 25, 26 due to the up/down movement of the lens 8. Using this signal, a current to adjust the position of the lens at right position is supplied by the specific drive circuit by a coil 62. With respect to the rotation/movement of (c), (d) direction, correction current is supplied by the voltage generated at piezo element 24a-24d to a coil 61. In this way the vibration of lens at the time of high speed access is stopped in a short time. |
