| 摘要 |
PURPOSE:To accurately align the convex portion of a recording medium and a turntable thereby to prevent generation of wow and flutter by establishing a play between the recording medium and the holding portion of a card casing when the recording card is mounted. CONSTITUTION:At the initial stage of insertion, a recording card 20 forcibly moves a sensing lever 42, and the positioning holder 44' of a holding lever 44 comes close to the outer circumference of the recording convex portion 21' of the card 20. Then, the card 20 is inserted while pushing the lever 42, and the outer circumference of the convex portion 21' has its plural positions contacting with a pin 41 with the aid of the plural pins 41 of a positioning plate 40 so that the card 20 is stopped. Simultaneously with the contact with the pin 41, the holding portion 44' holds the present portion of the convex portion 21', and the axis of the recording medium held with a play by the card 20 is fixed the position to contact with the pin 41. At the same time, by the forced stop of the projecting portion 42', the other positioning fulcrum is generated by the holding portion 44' so that the convex portion 21' is aligned with the axis of the turntable. |
