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 (JP)
KOSHITA AKIO (JP)
NAKANO JUN (JP)
KOSHITA AKIO (JP)
NAKANO JUN (JP)
Application Number:
PCT/JP2001/010376
Publication Date:
June 06, 2002
Filing Date:
November 28, 2001
Export Citation:
Assignee:
SONY CORP (JP)
KIKUCHI MINORU (JP)
KOSHITA AKIO (JP)
NAKANO JUN (JP)
KIKUCHI MINORU (JP)
KOSHITA AKIO (JP)
NAKANO JUN (JP)
International Classes:
B29C45/26; B29D17/00; G11B7/24; G11B7/24024; G11B7/24047; G11B7/24056; G11B7/24067; G11B7/26; G11B23/00; (IPC1-7): G11B7/24; G11B7/26; B29C45/26
Foreign References:
| JP2000298879A | 2000-10-24 | |||
| JPH05307769A | 1993-11-19 | |||
| JPH11156897A | 1999-06-15 | |||
| JPS60261042A | 1985-12-24 | |||
| JP2000311382A | 2000-11-07 | |||
| JP2000322765A | 2000-11-24 | |||
| JPH1131337A | 1999-02-02 | |||
| JP2000322768A | 2000-11-24 | |||
| JPH06251426A | 1994-09-09 | |||
| JPH07171902A | 1995-07-11 | |||
| JP2000322781A | 2000-11-24 | |||
| JPH01135606A | 1989-05-29 | |||
| JPH11339330A | 1999-12-10 |
Other References:
See also references of EP 1339054A4
Attorney, Agent or Firm:
Sugiura, Masatomo (Ikebukuro Park Bldg. 49-7 Minami Ikebukuro
2-chome Toshima-ku, Tokyo, JP)
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