| 摘要 |
PROBLEM TO BE SOLVED: To enable recording/reproducing recording media with different plate thicknesses by providing a mechanism and parts, switching an objective lens corresponding to it with a switch of an optical path, according to the thickness of the recording medium. SOLUTION: When the objective lens 1 corresponding to the recording medium A is selected, a stopper making a current flow through coils 18a, 18b, and generating force in order to position is provided, and the mechanism holding the position by attracting force between a magnet 20a and a core 19a is provided. Thus, the light from the outside is reflected by a reflection mirror 16, to be focused on the recording medium A through the objective lens 1. Similarly, when the objective lens 2 corresponding to the recording medium B is selected, the stopper, making the current flow through the coils 18a, 18b, and turning the reflection mirror 16 so as to position, is provided. Thus, the objective lens is switched according to the thickness of the recording medium. |
