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Patent Searching and Data


Title:
OPTICAL DISK MANUFACTURING METHOD
Document Type and Number:
WIPO Patent Application WO/2003/017269
Kind Code:
A1
Abstract:
A film is formed on a disk−shaped substrate material to form a light transmissive resin layer without forming any center hole. An optical disk manufacturing method includes a step of injecting synthetic resin from a gate into a cavity of a mold device (30) and solidifying−molding a disk−shaped substrate material (12) together with a sprue runner (14) in the gate, a film formation step of forming a film (18) on the disk−shaped substrate material (12) integrated with the sprur runner (14) taken out of the mold device (30), a step of forming a light transmissive resin layer (22), and a step of punching a center part (26) of the disk−shaped substrate material (12) together with the sprue runner (14) to form a center hole (28).

Inventors:
USAMI MAMORU (JP)
SAKAI YOSHIMI (JP)
YAMAGA KENJI (JP)
ISHIZAKI HIDEKI (JP)
Application Number:
PCT/JP2002/007830
Publication Date:
February 27, 2003
Filing Date:
July 31, 2002
Export Citation:
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Assignee:
TDK CORP (JP)
USAMI MAMORU (JP)
SAKAI YOSHIMI (JP)
YAMAGA KENJI (JP)
ISHIZAKI HIDEKI (JP)
International Classes:
B29C45/00; B29C45/17; B29C45/26; B29D17/00; G11B7/26; B29L9/00; B29L17/00; (IPC1-7): G11B7/26; G11B7/24
Foreign References:
JPH1040584A1998-02-13
JPS59203257A1984-11-17
JPH05128509A1993-05-25
JPH0957696A1997-03-04
JPH02110840A1990-04-24
Attorney, Agent or Firm:
Matsuyama, Keisuke (Yoyogi 2-chome Shibuya-ku, Tokyo, JP)
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