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Title:
OPTICAL RECORDING MEDIUM, PRODUCTION METHOD AND PRODUCTION DEVICE FOR OPTICAL RECORDING MEDIUM
Document Type and Number:
WIPO Patent Application WO/2004/006234
Kind Code:
A1
Abstract:
An optical recording medium having a light transmitting layer formed with a uniform thickness on a substrate and being not likely to cause flash and delamination on the inner peripheral portion of the light transmitting layer, and a production method and a production device for the optical recording medium. An optical recording medium (10) is produced by a method comprising the step of forming a circular substrate (12) having an information recording surface (12A) on one surface thereof, the step of forming on the information recording surface (12A) a light transmitting layer (14) thinner than the substrate (12), the notching step of forming a circular notch (16) in the light transmitting layer (14), and the step of punching a region on the inner side of the notch (16) with a punching tool (18) to form a center hole (14A) and a center hole (20) in the light transmitting layer (14) and the substrate (12).

Inventors:
Ushida, Tomoki c/o TDK CORPORATION (1-13-1 Nihonbash, Chuo-ku Tokyo, 103-8272, JP)
Usami, Mamoru c/o TDK CORPORATION (1-13-1 Nihonbash, Chuo-ku Tokyo, 103-8272, JP)
Yamaga, Kenji c/o TDK CORPORATION (1-13-1 Nihonbash, Chuo-ku Tokyo, 103-8272, JP)
Application Number:
PCT/JP2003/007237
Publication Date:
January 15, 2004
Filing Date:
June 06, 2003
Export Citation:
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Assignee:
TDK CORPORATION (1-13-1, Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Ushida, Tomoki c/o TDK CORPORATION (1-13-1 Nihonbash, Chuo-ku Tokyo, 103-8272, JP)
Usami, Mamoru c/o TDK CORPORATION (1-13-1 Nihonbash, Chuo-ku Tokyo, 103-8272, JP)
Yamaga, Kenji c/o TDK CORPORATION (1-13-1 Nihonbash, Chuo-ku Tokyo, 103-8272, JP)
International Classes:
B26D3/08; B26D9/00; B26F1/38; B29D17/00; G11B7/26; G11B23/00; (IPC1-7): G11B7/24; G11B7/26
Foreign References:
JP2000298879A2000-10-24
JP2002170279A2002-06-14
JP2002184037A2002-06-28
JPH10289489A1998-10-27
JPH0831023A1996-02-02
JP2001246643A2001-09-11
JP2000322765A2000-11-24
EP1152407A22001-11-07
JP2000298879A2000-10-24
JP2002170279A2002-06-14
Other References:
See also references of EP 1533801A4
Attorney, Agent or Firm:
Matsuyama, Keisuke (Minami-Shinjuku Bldg, 10-12 Yoyogi 2-chom, Shibuya-ku Tokyo, 151-0053, JP)
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