Invention Grant
- Patent Title: Optical disc molding apparatus
- Patent Title (中): 光盘成型装置
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Application No.: US127917Application Date: 1998-08-03
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Publication No.: US6142761APublication Date: 2000-11-07
- Inventor: Nobuyuki Arakawa , Yuji Akiyama , Ken Minemura
- Applicant: Nobuyuki Arakawa , Yuji Akiyama , Ken Minemura
- Applicant Address: JPX Tokyo
- Assignee: Sony Corporation
- Current Assignee: Sony Corporation
- Current Assignee Address: JPX Tokyo
- Priority: JPX9-209224 19970804
- Main IPC: B29C45/26
- IPC: B29C45/26 ; G11B7/26 ; B29C45/17
Abstract:
An optical disc molding apparatus is able to mold an optical disc in which the occurrence of swollen portions of trumpet shape on the upper and lower surfaces of on the outer peripheral portion of a disc base may be minimized and in which a burr may be prevented from being produced on the outer peripheral portion of the disc base. In the optical disc molding apparatus having a ring (6) for molding an outer diameter portion of a disc base and holding a stamper (5) for transfer a signal pit, a holding surface of the ring (6) for holding the stamper (5) is formed as the concave and convex surfaces comprising a plurality of concentric land portions (21) and a plurality of concentric groove portions (22). The outer peripheral surface of the stamper (5) is held by each land portion (21) with a pressure.
Public/Granted literature
- US5382645A Process for the preparation of crosslinked poly(isocyanates) Public/Granted day:1995-01-17
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