| 摘要 |
PROBLEM TO BE SOLVED: To provide an optical pickup device which is capable of focusing and tracking adjustment in a short time with less energy consumption and which has a simplified driving mechanism. SOLUTION: The device is equipped with an objective lens 13 comprising a transparent piezoelectric element that is deformed by adding an electric field, and is designed to make the focal position of a laser beam adjustable by deforming the element by adding the electric field using a control circuit 15. |
