| 摘要 |
PROBLEM TO BE SOLVED: To automatically release engagement between an engaging tooth and a screw thread by the running-away of a nut from a screw part when an excessive external force is applied to a feed nut by the falling or the like of a disk drive, by contriving the shapes of the engaging tooth of the nut part of the feed nut, and the screw thread of the screw part of a feed screw shaft. SOLUTION: This disk drive is provided with an optical pickup device. A feed nut 67 is provided with a nut part 68 having an engaging tooth 68a engaged with the screw part 26a of a feed screw shaft 26, and a bending deformable elastic piece 69a having the nut part 68 fixed on its tip. The elastic piece 69a is extended in the axial direction of the feeding screw shaft 26, the inclined anglesθ2 andϕ2 of tooth surfaces 49a and 49b in both sides of the engaging tooth 68a are made different from each other, the inclined angleθ2 of the tooth surface 49a of a fulcrum side is set larger than the inclined angleϕ2 of the tooth surface 49b of the tip side of the elastic piece 69a. Moreover, the screw thread of the screw part 26a of the feed screw shaft 26 is corresponded to the engaging tooth 68a, and the opposing surfaces are formed to have equal inclined angles.
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