| 摘要 |
PROBLEM TO BE SOLVED: To suppress the occurrence of spherical aberration in an optical disk device. by moving a first lens and a second lens in an optical axis direction of a light beam and relatively moving one side of the first lens and the second lens with respect to the lens of other side in the optical axis direction of the light beam. SOLUTION: Since an actuator 6 is made so as to relatively move a front cell lens 3 in the optical axis direction with respect to an objective lens 4, it is possible to adjust the interval between the front cell lens 3 and the objective lens 4. Moreover, since an actuator 7 is a biaxial actuator, the actuator 7 is made so as to move the front cell lens 3 and the objective lens 7 in the optical axis direction and also to move them in a direction perpendicular to tracks of an optical disk 1. By such a constitution, the distance of an air gap 8 can be adjusted by the actuator 7 and also the interval between the front cell lens 3 and the objective lens 4 can be adjusted by the actuator 6. |
