| 摘要 |
A DISC CARTRIDGE (1) HOUSING A DISC-SHAPED RECORDING MEDIUM (2) IN ITS MAIN CARTRIDGE BODY PORTION IS DISCLOSED. THE DISC CARTRIDGE (1) INCLUDES THE MAIN CARTRIDGE BODY PORTION (5) HAVING A CIRCULAR MEDIUM HOUSING SECTION (11) ROTATION ALLY HOUSING THE DISC-SHAPED RECORDING MEDIUM (2) AND AN OPENING (15,16) FOR EXPOSING AT LEAST A PORTION OF THE DISC-SHAPED RECORDING MEDIUM (2) TO OUTSIDE, AND FIRST AND SECOND SHUTTER MEMBERS (25,26) ROTATED ALONG THE MAJOR SURFACE OF THE MAIN CARTRIDGE BODY PORTION (5) TO OPEN/CLOSE AT LEAST THE ABOVE OPENING (15,16). THE FIRST SHUTTER MEMBER (25) IS SUPPORTED FOR ROTATION ALONG THE CIRCULAR MEDIUM HOUSING SECTION (11) PROVIDED ON THE MAIN CARTRIDGE BODY PORTION (5). THE SECOND SHUTTER MEMBER (26) IS SUPPORTED BY THE MAIN CARTRIDGE BODY PORTION (5) FOR ROTATION IN CONJUNCTION WITH THE ROTATION OF THE FIRST SHUTTER MEMBER (25). WHEN THE FIRST SHUTTER MEMBER (25) IS MOVED TO A FIRST POSITION OVERLYING THE OPENING (15,16), THE SECOND SHUTTER MEMBER (26) IS INTIMATELY CONTACTED WITH A LATERAL SIDE OF THE FIRST SHUTTER MEMBER (25) TO OVERLIE THE OPENING (15,16). WHEN THE FIRST SHUTTER MEMBER (25) IS ROTATED TO A POSITION OF EXPOSING THE OPENING (15,16), THE SECOND SHUTTER MEMBER (26) IS ROTATED, ALONG WITH THE FIRST SHUTTER MEMBER (25), TO A POSITION OF OPENING THE ABOVE OPENING (15,16). SINCE THE OPENING (15,16) PROVIDED IN THE MAIN CARTRIDGE BODY PORTION (5) IS OPENED/CLOSED BY THE FIRST AND SECOND SHUTTER MEMBERS (25,26) MOVED ALONG THE MAJOR SURFACE OF THE MAIN CARTRIDGE BODY PORTION (5), THE OPENING (15,16) CAN BE LARGER IN SIZE THAN THE MAIN CARTRIDGE BODY PORTION (5). THE LARGE-SIZED OPENING IS POSITIVELY OPENED/CLOSED BY THE FIRST AND SECOND SHUTTER MEMBERS (25,26).FIG 4&6
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