Disk production apparatus and disk produced by disk production apparatus
View Patent ↗A disk production apparatus has a movable-side metal mold and a fixed-side metal mold provided as facing the movable-side metal mold, the fixed-side metal mold having a center hole. Inserted into the center hole is a retainer to attach a stamper on the fixed-side metal mold. The center of an inner diameter of the retainer and the center of an outer diameter of the retainer are eccentric with each other. The retainer may be inserted into a center hole of the movable-side metal mold for attaching the stamper on the movable-side metal mold. A disk has a substrate having a center hole; a first zone formed on the substrate, data being recorded on the first zone; and a second zone formed on the substrate but outside the first zone. Labeled on the second zone is a marker indicating an amount of eccentricity applied to the retainer used in production of the disk by injection molding.
1. A disk production apparatus comprising:
a movable-side metal mold;
a fixed-side metal mold provided as facing the movable-side metal mold, the fixed-side metal mold having a center hole; and
a retainer inserted into the center hole to attach a stamper on the fixed-side metal mold, a first center of an inner diameter of the retainer and a second center of an outer diameter of the retainer being eccentric with each other,
wherein the retainer has a marker indicating an amount of eccentricity between the first and the second centers, the marker being to be transferred onto a disk.
2. The disk production apparatus according to claim 1 wherein the marker is formed along a straight line connecting the first and the second centers.
3. A disk production apparatus comprising:
a fixed-side metal mold;
a movable-side metal mold provided as facing the fixed-side metal mold, the movable-side metal mold having a center hole; and
a retainer inserted into the center hole to attach a stamper on the movable-side metal mold, a first center of an inner diameter of the retainer and a second center of an outer diameter of the retainer being eccentric with each other,
wherein the retainer has a marker indicating an amount of eccentricity between the first and the second centers, the marker being to be transferred onto a disk.
4. The disk production apparatus according to claim 3 wherein the marker is formed along a straight line connecting the first and the second centers.
5. A disk production apparatus comprising:
a movable-side metal mold;
a fixed-side metal mold provided as facing the movable-side metal mold, the fixed-side metal mold having a first center hole; and
a retainer inserted into the first center hole to attach a stamper on the fixed-side metal mold, a first center of an inner diameter of the retainer and a second center of an outer diameter of the retainer being eccentric with each other,
wherein the retainer has a first marker indicating an amount of eccentricity between the first and the second centers, the first marker being transferred onto a disk; and
the stamper has a data-recorded zone formed thereon and a second center hole through which the stamper is held on the fixed-side metal mold, a first center axis of an inner-most section of the data-recorded zone and a second center axis of the second center hole being eccentric with each other, the stamper having a second marker indicating an amount of eccentricity between the first and the second centers axes, the second marker being to be transferred onto the disk.
6. The disk production apparatus according to claim 5 wherein the first marker is formed along a straight line connecting the first and the second centers whereas the second marker is formed on a zone on the stamper and along a straight line connecting the first and the second center axes, the zone being different from the data-recorded zone.
7. A disk production apparatus comprising:
a fixed-side metal mold;
a movable-side metal mold provided as facing the fixed-side metal mold, the movable-side metal mold having a first center hole; and
a retainer inserted into the first center hole to attach a stamper on the movable-side metal mold, a first center of an inner diameter of the retainer and a second center of an outer diameter of the retainer being eccentric with each other,
wherein the retainer has a first marker indicating an amount of eccentricity between the first and the second centers, the first marker being to be transferred onto a disk; and
the stamper has a data-recorded zone formed thereon and a second center hold through which the stamper is held on the fixed-side metal mold, a first center axis of an inner-most section of the data-recorded zone and a second center axis of the second center hold being eccentric with each other, the stamper having a second marker indicating an amount of eccentricity between the first and the second centers axes, the second marker being to be transferred onto the disk.
8. The disk production apparatus according to claim 7 wherein the first marker is formed along a straight line connecting the first and the second centers whereas the second marker is formed on a zone on the stamper and along a straight line connecting the first and the second center axes, the zone being different from the data-recorded zone.