Title:
OPTICAL RECORD MEDIUM AND ITS MANUFACTURING METHOD, AND INJECTION MOLDING MACHINE
Document Type and Number:
WIPO Patent Application WO/2002/045082
Kind Code:
A1
Abstract:
An optical disc for recording/reproducing an information signal by irradiating a disc substrate (1) having an information signal section (1c) on one main surface with a laser beam from the information signal section (1c) side has a clamp reference face (3a) provided on a replica substrate (1a) for producing the optical disc on the same side where a information signal section (1c) is provided. The clamp reference face (3a) is flat, and the replica substrate (1a) is thicker in a clamp region (3) than in an information recorded area (4). An embossed replica substrate (1a) is used wherein the periphery of a center hole (1b) is thicker than the information recorded area (4).
Inventors:
Kikuchi, Minoru (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Koshita, Akio (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Nakano, Jun (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Koshita, Akio (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Nakano, Jun (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Application Number:
PCT/JP2001/010376
Publication Date:
June 06, 2002
Filing Date:
November 28, 2001
Export Citation:
Assignee:
SONY CORPORATION (7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Kikuchi, Minoru (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Koshita, Akio (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Nakano, Jun (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Kikuchi, Minoru (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Koshita, Akio (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
Nakano, Jun (C/O SONY CORPORATION 7-35, Kitashinagawa 6-chome Shinagawa-ku, Tokyo, 141-0001, JP)
International Classes:
B29C45/26; B29D17/00; G11B7/24; G11B7/26; G11B23/00; B29C45/26; B29D17/00; G11B7/24; G11B7/26; G11B23/00; (IPC1-7): G11B7/24; B29C45/26; G11B7/26
Attorney, Agent or Firm:
Sugiura, Masatomo (7th Floor, Ikebukuro Park Bldg. 49-7 Minami Ikebukuro
2-chome Toshima-ku, Tokyo, 171-0022, JP)