DISK APPARATUS AND INFORMATION RECORDING DISK
One aspect of the embodiments utilizes a disk apparatus employing a ramp loading method, which includes a ramp member having an overlapping portion with which a part of a disk having an information recording surface and a lateral side overlaps, and a groove is formed on the entire lateral side of the disk. The disk apparatus includes a protrusion formed on a portion of the overlapping portion of the ramp member that is opposed to the lateral side of the disk and the protrusion protrudes into the groove.
1 . A disk apparatus employing a ramp loading method, comprising:
a ramp member having an overlapping portion with which a part of a disk having an information recording surface and a lateral side overlaps;
a groove formed on the entire lateral side of the disk;
a protrusion formed on a portion of the overlapping portion of the ramp member that is opposed to the lateral side of the disk, the protrusion protruding into the groove.
2 . The disk apparatus according to claim 1 , wherein a certain clearance is left between the protrusion and the groove.
3 . The disk apparatus according to claim 2 , wherein a dimension of the certain clearance is narrower than a clearance between the information recording surface of the disk and an inner surface of the overlapping portion of the ramp member.
4 . The disk apparatus according to claim 1 , wherein a profile of the groove is in a tapered shape; and a profile of the protrusion is also in a tapered shape.
5 . The disk apparatus according to claim 1 , wherein a profile of the groove is in a rectangular shape; and a profile of the protrusion is also in a rectangular shape.
6 . The disk apparatus according to claim 1 , wherein lubricant is coated on an inner wall of the groove.
7 . An information recording disk that is incorporated in a disk apparatus, comprising:
a groove formed on a lateral side thereof entirely.
8 . The information recording disk according to claim 7 , wherein a profile of the groove is in a tapered shape.
9 . The information recording disk according to claim 7 , wherein a profile of the groove is in a rectangular shape.