| 摘要 |
PROBLEM TO BE SOLVED: To provide the objective lens driving device capable of recording and reproducing even various kinds of optical information recording media. SOLUTION: A 1st objective lens 34 and a 2nd objective lens 35 are formed on a lens substrate 46, and this lens substrate 46 is fixed by a lens holder 75. Four magnetic substances are hurried symmetrically around a rotary shaft in a surrounding part of this lens holder 75, and coils are fixed on these magnetic substances. A supporting body 74 for supporting rotatably this lens holder 75 is fixed with four permanent magnets 81 and 82 corresponding to the coils. One set of the permanent magnets 81 opposite to each other function as focus control, while the other set of the permanent magnets 82 opposite to each other function as tracking control and also changing the objective lenses. |
