Optical disc molding device and molding method for optical disc
AssigneeSony Corporation
InventorsNobuyuki Arakawa, Toshiyuki Kashiwagi, Asao Kurosu, Yuji Akiyama, Shinsuke Kishi
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Abstract
An optical disc molding device has a pair of molds for injection molding a disc substrate within cavities, and a stamper supported within at least one cavity, for molding a data recording surface in such a manner that the inside diameter side of the stamper supporting surface of the cavity protrudes inwardly in the disc thickness direction from the data recording surface. The flatness of a laminated reference plane has thus been deteriorated by burrs occurring on a disc substrate.
Claims10
An optical disc molding device comprising:
- a pair of molds for injection molding a disc substrate within a cavity;
- a stamper supported within the cavity of at least one mold, having a data recording surface consisting of fine irregularities for transferring recording information onto a disc and;
- a stamper supporting surface within the cavity of said mold, having a horizontal portion, a sloping portion, and a protruding portion with which an inside diameter side of said stamper is brought into contact during molding of said disk, said protruding portion protruding inwardly in a disc thickness direction from said data recording surface of said stamper.
An optical disc molding device comprising:
- a pair of molds for injection molding a disc substrate within a cavity;
- and
- a stamper supported within the cavity of at least one mold, having a protruding burr and a data recording surface consisting of fine irregularities for transferring recording information onto a disc,
- wherein the burr of said stamper is brought into contact with the disc substrate during molding of said disc, protruding inwardly in the disc thickness direction.
A disc molding method comprising the steps of:
- mounting a stamper, having a data recording surface consisting of fine irregularities for transferring recording information onto a disc, within the cavity of at least one mold, of a pair of molds for injection molding a disc substrate within said cavity;
- and
- injection molding the disc substrate, and concurrently causing the inside diameter side of said stamper to protrude inwardly in the disc thickness direction from the data recording surface of said stamper.
Dependencies are inferred from the claim text.