| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a disk device for efficiently correcting spherical aberrations at high speed. <P>SOLUTION: A spherical aberration correction mechanism 3 is provided with: a base plate 15 having a guide rod 21 parallel to an optical axis O and a guide hole 24 and fixed to a slide base 1; a lens holder 16 which supports a spherical aberration correction lens 4 and engages with the guide rod 21 movably; and a lead nut 17 engaged with the guide hole 24 while being screw-engaged with a lead screw 27, the spherical aberration correction mechanism 3 is further provided with: a thrust pressure spring 36 for pressing the lens holder 16 to the lead nut 17; and a radial pressure spring 31 for simultaneously pressing the lead nut 17 to the inner surface of the guide hole 24 and the lens holder 16 to the guide rod 21. The lead screw 27 is rotated normally/reversely by a stepping motor 25 to reciprocate the spherical aberration correction lens 4 along the optical axis through the lead nut 17 and the lens holder 16. <P>COPYRIGHT: (C)2009,JPO&INPIT |
