OPTICAL DISK MANUFACTURING METHOD

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).

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Inventors:

Usami, Mamoru c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Sakai, Yoshimi c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Yamaga, Kenji c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Ishizaki, Hideki c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)

Application Number:

PCT/JP2002/007830

Publication Date:

February 27, 2003

Filing Date:

July 31, 2002

Export Citation:

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Assignee:

TDK CORPORATION (1-13-1, Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Usami, Mamoru c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Sakai, Yoshimi c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Yamaga, Kenji c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Ishizaki, Hideki c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)

International Classes:

B29C45/00; B29C45/17; B29C45/26; B29D17/00; G11B7/26; B29L9/00; B29L17/00; B29C45/00; B29C45/17; B29C45/26; B29D17/00; G11B7/26; (IPC1-7): G11B7/26; G11B7/24

Attorney, Agent or Firm:

Matsuyama, Keisuke (Minami-Shinjuku Bldg. 10-12, Yoyogi 2-chome Shibuya-ku, Tokyo, 151-0053, JP)

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