| 摘要 |
PROBLEM TO BE SOLVED: To make individually distinguishable plural recessed parts of a rotating tray in which a disk is arranged when the rotation of the rotating tray is detected. SOLUTION: A ring-like step part is formed on the lower surface of a rotating tray 43 and a gear groove is formed in the inner periphery of the ring-like step part in a gear 76. The torque from a motor 73 is exerted on the gear 76 via a worm wheel 74. The round step part of the rotary shaft 71 in the lower surface of the rotating tray 43 is formed and a gear groove is formed in the outer periphery of the step part in a gear 77. In a rotary switch 75, a second gear 78 meshing with the first gear 77 is attached to a rotating part 79, and the rotation of the rotating part 79 is detected by the connection and intermittence of an electrical contact.
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