Patent ID: 8689245

Claim:
An optical pick-up device transfer mechanism for transferring an optical pick-up device, the mechanism comprising: a drive shaft having an external screw threaded around an external circumference thereof; a follower member having teeth; and a base member coupled to the follower member, the optical pick-up device being transferred by the base member in a state in which the teeth are engaged with the external screw, wherein the external screw of the drive shaft is configured by a multiple-thread screw such that at least one separate external single-thread screw is threaded between threads of a single-thread external screw that is engaged with two main teeth, and wherein the teeth of the follower member include the two main teeth and at least one subsidiary tooth, the main teeth relating to the transfer of the optical pick-up device, the subsidiary tooth being provided between the two main teeth and not related to the transfer of the optical pick-up device.