Process for manufacturing optical discs
AssigneeMeiki Co., Ltd.
InventorToshiyuki Ebina
Life of this patent
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Abstract
A process of manufacturing the optical discs by injection molding includes compulsive forced cooling of the molded discs, carried out after sputtering to shorten the cooling time in the mold, in consideration of keeping the replication errors in the pits on the molded discs. The process also includes metallizing the surface of the molded discs by sputtering (to make laser beams reflect). UV resin coating for protecting the metallized surface of the discs, and inspecting the pits for replication of information signals quality.
Claims9
An injection molding, sputtering, coating and curing process for manufacturing discs with information signals in a mold of an injection molding machine, said process for manufacturing the discs comprising the successive steps of:
- injecting melted resin into a disc cavity of the mold to replicate information signal pits on a disc molded therein;
- retaining the molded disc in the mold at the injection molding machine to cool for a predetermined number of seconds;
- taking out the molded disc from the mold for immediate transfer to a metallizing device;
- metallizing a surface of the molded disc in the metallizing device just after taking out the molded disc;
- forcefully cooling the metallized disc to a predetermined temperature;
- and
- coating resin on the metallized surface of the molded disc cooled to the predetermined temperature;
- whereby quality of the information signal pits is improved over another process with machine mold cooling for the predetermined number of seconds but without immediate transfer to the metallizing device.
Dependencies are inferred from the claim text.