One end time motion possibly to provide the lever which axial support is done in the rack, other than the lever either of the edge or based chassis on the one hand, to install the long groove in abbreviation vertical direction vis-a-vis the transport direction of the optical pickup, on the other hand, time motion and sliding be engaged possibly in the aforementioned long groove, in order the occasion where the aforementioned optical pickup is transported, to slide alongside the long groove, to provide the fulcrum component, in order to give the attaching power which this makes the tooth of the rack and the gear line touch to the rack, to designate the above-mentioned other edge of the lever as the fulcrum, the above-mentioned one end of the lever as an action pointIt applied the spring which attaching power of the direction which turns the lever usual is given while specified position of the based chassis and intermediate position of the lever transferred.
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