Cartridge type recording medium and disk-shaped recording medium including a hole for centering each thereof, cartridge, driving unit and driving method
View Patent ↗The object of the present invention is to provide a technology which has high compatibility and can provide users with conveniences. A new system recording medium 100 has a center hole 112 formed on a recording disk 110 and a center hole 121 formed on a center hub 120 , so that the recording medium 100 can respond to both an old system driving unit having a centering member coupling with the center hole 112 and a new system driving unit 300 having a second centering member 313 coupling with the center hole 121 . Moreover, the old system recording medium is a recording medium providing a recording disk having a center hole incorporated in a cartridge having a center hub, and has a structure where the center hole is coupled both with a first centering member 312 of the new system driving unit 300 and with the centering member of the old system driving unit.
1. A driving unit for executing recording/reproducing to a recording disk, comprising in a disk holding portion for holding the recording disk:
a first centering member having a predetermined outer diameter;
a second centering member having an outer diameter smaller than that of the first centering member; and
a protrusion size changing mechanism for changing a protrusion size of the second centering member toward the recording disk with respect to the first centering member,
wherein when the recording disk held by the disk holding portion has a center hole of a predetermined diameter formed in the center portion of the recording disk, and a centering hole formed in the hub fixed to the recording disk, the centering hole having a diameter smaller than that of the center hole, the disk holding portion centers the recording disk by coupling the second centering member into the centering hole,
wherein:
the second centering member is capable of having a portion thereof inserted into the recording disk;
the protrusion size is the size of the portion of the second centering member that is inserted into the recording disk; and
the protrusion size changing mechanism changes the size of the portion of the second centering member that is inserted into the recording disk by retreating the first centering member with respect to the second centering member.
2. A driving unit for executing recording/reproducing to a recording disk, comprising in a disk holding portion for holding the recording disk:
a first centering member having a predetermined outer diameter;
a second centering member having an outer diameter smaller than that of the first centering member; and
a protrusion size changing mechanism for changing a protrusion size of the second centering member toward the recording disk with respect to the first centering member,
wherein when the recording disk held by the disk holding portion has a center hole of a predetermined diameter formed in a center portion of the recording disk, and a hole formed in a hub provided to move with respect to the recording disk, the hole having a diameter smaller than that of the center hole, the disk holding portion centers the recording disk by coupling the first centering member into the center hole,
wherein:
the second centering member is capable of having a portion thereof inserted into the recording disk;
the protrusion size is the size of the portion of the second centering member that is inserted into the recording disk; and
the protrusion size changing mechanism changes the size of the portion of the second centering member that is inserted into the recording disk by retreating the first centering member with respect to the second centering member.
3. A driving unit for driving a cartridge type recording medium incorporating a recording disk in a cartridge, comprising:
a centering member coupled into a center hole of the recording disk to center the recording disk when the cartridge type recording medium incorporating the recording disk having the center hole formed in a center portion thereof, and a hub having a hole of a diameter smaller than that of the center hole is driven;
a table member having a table surface on which one surface side of the recording disk is abutted; and
a protrusion size changing mechanism for changing a protrusion size toward the recording disk with respect to the centering member,
wherein as the protrusion size changing mechanism, an elastic member is provided to retreat the centering member with respect to the recording disk, and return the centering member to an original position,
the driving unit further comprising a protrusion member that is capable of protruding toward the recording disk, the protrusion size being a size of a portion of the protrusion member that is inserted into the center hole, wherein the size of the portion of the protrusion that is inserted into the center hole is controlled by the protrusion size changing mechanism via retreating the centering member with respect to the recording disk.
4. A driving unit according to claim 3 , wherein the hub is held in the cartridge in a movable state in a diameter direction of the recording disk.
5. The driving unit according to claim 3 , wherein the recording disk comprises a substrate having two major surfaces, a recording layer is formed on one of the two major surfaces, and the hub is formed on the other of the two major surfaces.
6. A driving unit capable of recording and/or reproducing to a first recording disk having a hole for centering and a second recording disk having a hole for centering, comprising in a disk holding portion for holding the first recording disk and the second recording disk:
a first centering member for centering the first recording disk having a predetermined outer diameter;
a second centering member for centering the second recording disk having an outer diameter thereof smaller than the first centering member; and
a protrusion size changing mechanism for changing a protrusion size of the second centering member against the first centering member toward the second recording disk,
wherein when the first recording disk held by the disk holding portion has a center hole of a predetermined diameter formed in a center portion of the first recording disk, and a hole formed in a hub provided to move with respect to the first recording disk, the hole having a diameter smaller than that of the center hole, the disk holding portion centers the first recording disk by coupling the first centering member into the center hole of the first recording disk, wherein when the second recording disk held by the disk holding portion has a center hole of a predetermined diameter formed in the center portion of the second recording disk, and a centering hole formed in the hub fixed to the second recording disk, the centering hole of the hub having a diameter smaller than that of the center hole of the second recording disk, the disk holding portion centers the second recording disk by coupling the second centering member into the centering hole of the hub,
wherein as the protrusion size changing mechanism, an elastic member is provided to retreat the first centering member with respect to the second centering member, and return the first centering member to an original position, and
wherein:
the second centering member is capable of having a portion thereof inserted into the second recording disk;
the protrusion size is the size of the portion of the second centering member that is inserted into the second recording disk; and
the protrusion size changing mechanism changes the size of the portion of the second centering member that is inserted into the second recording disk by retreating the first centering member with respect to the second centering member.