| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide an information disk wherein quality reduction such as peeling is not generated even when the information disk is housed in a case for a CD since a joining boundary part in an inner hole does not interfere with an inner hole supporting part of the case, to enhance operation easiness for a user and to reduce manufacturing costs of the case. <P>SOLUTION: Upper and lower disks 35 and 37 having an inner hole 33 at respective centers are stuck to each other to form the round plate-shaped information disk 31. An edge part 39 on the lower surface side in the inner hole 33 of the upper disk 35 and an edge part 41 on the upper surface side in the inner hole 33 of the lower disk 37 are removed from the inner peripheral surface of the inner hole 33 to form a chamfered part 43 continued in the inner peripheral direction of the inner hole 33. <P>COPYRIGHT: (C)2004,JPO |
