| 摘要 |
A DISC CARTRIDGE (200) INCLUDES A CASE ACCOMMODATING A DISC (D) AND HAVING AN APERTURE HOLE (221) FORMED ON A FIRST SURFACE OF THE CASE SO THAT A RECORDING/REPRODUCING APPARATUS ACCESS A RECORDING SURFACE OF THE DISC (D), AND AN OPEN HOLE (211) FORMED ON A SECOND SURFACE TO BE OPEN TO AN OUTSIDE OF THE CASE, A SHUTTER OPENING/SHUTTING THE APERTURE HOLE (221) AND INSTALLED IN THE CASE, A DISC HOLDER (250) INSTALLED AT A SIDE DEFINING THE OPEN HOLE (211) TO MOVE UP AND DOWN AND COVERING A GAP (G) BETWEEN AN OUTER CIRCUMFERENCE (D3) OF THE DISC (D) AND AN INNER SURFACE OF THE SIDE DEFINING THE OPEN HOLE (211) WHEN THE DISC HOLDER (250) DESCENDS, AND A SHUTTER DRIVING MECHANISM MOVING THE SHUTTER SO THAT THE APERTURE HOLE (250) IS OPEN/SHUT. THUS, A PASSAGE THROUGH WHICH DUST IS INTRODUCED TOWARD AN INFORMATION AREA OF THE DISC (D), AND A GAP (G) FORMED AT AN OUTER CIRCUMFERENCE (D3) ARE BLOCKED BY THE DISC HOLDER (250) SO THAT A POSSIBILITY OF CONTAMINATION BY DUST CAN BE REDUCED.FIGURE 3
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