Title:
METAL MOLD DEVICE FOR MANUFACTURING DISK−LIKE SUBSTRATE MATERIAL, METHOD OF MANUFACTURING DISK−LIKE SUBSTRATE MATERIAL, DISK−LIKE SUBSTRATE MATERIAL FOR OPTICAL DISK, AND OPTICAL DISK
Document Type and Number:
WIPO Patent Application WO/2003/042995
Kind Code:
A1
Abstract:
A metal mold device (30) capable of forming a disk−like substrate material for an optical disk with a center hole so that a resin layer with uniform thickness distribution can be formed thereon, a stamper (10) is held on a movable metal mold (34) by a sucking means (36) in a cavity (31), a through−hole (10A) smaller in diameter than the center hole of the optical disk is formed in the stamper (10), and a metal mold split line and a step are not present at the portion of the information recording surface (12A) of the disk−like substrate material (12) formed by injection molding corresponding to an area ranging from the outer periphery of the stamper (10) to the through−hole (10A).
Inventors:
Yamaga, Kenji 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)
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)
Usami, Mamoru c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
Application Number:
PCT/JP2002/011810
Publication Date:
May 22, 2003
Filing Date:
November 12, 2002
Export Citation:
Assignee:
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)
Sakai, Yoshimi c/o 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)
Yamaga, Kenji 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)
Usami, Mamoru c/o TDK CORPORATION 1-13-1 (Nihonbashi Chuo-ku, Tokyo, 103-8272, JP)
International Classes:
B29C33/00; B29C45/26; B29D17/00; G11B7/26; B29C45/00; (IPC1-7): G11B7/26
Attorney, Agent or Firm:
Matsuyama, Keisuke (Minami-Shinjuku Bldg. 10-12, Yoyogi 2-chome Shibuya-ku, Tokyo, 151-0053, JP)
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