| 摘要 |
A head aperture portion, for access to a recording surface of a disc medium which is rotatably accommodated in a case, is opened and closed by a first shutter, which rotates coaxially with the disc medium, and a second shutter, which moves around a different axis from the first shutter. In a closed state, a first protrusion portion and a second protrusion portion, which are respectively formed in circular arc shapes, constitute an annular shape and abut at an inner side of the disc medium recording surface, thus blocking ingression of dust to the recording surface. During opening/closing and in a closed state of the head aperture portion, a guide mechanism, which is structured by a cam portion and a sliding protrusion, moves the second shutter away from the disc medium. Consequently, the second protrusion portion can be reliably prevented from interfering with the recording surface of the disc medium.
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