| 摘要 |
PROBLEM TO BE SOLVED: To perform an optimum focusing by providing an objective lens and allowing an optical pickup device to have a slider holding the lens with respect to a recording medium at a prescribed interval by the airflow generated by a rotating recording medium and providing a wing part whose elevation angle is changable in the slider. SOLUTION: A wing part 200 consisting of a first piezoelectric element body 201 and a second piezoelectric element body 203 is provided in a slider 71. A focus error signal in which outputs of respective light receiving surfaces of bisected photodetector are differentially operated by a differential amplifier is inputted to a control part, which changes voltages to be applied to the first and second piezoelectric element bodies 201, 203 via first and second piezoelectric element driving circuits. Then, quantities of extension and contraction of respective piezoelectric bodies 201, 203 are changed and the elevation angle of the wing part 200 is changed to change the flying hight of the slider 71 to a position where the objective lens is focused. Moreover, the control part performs a tracking by driving a coil based on a tracking error signal. |
