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

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 (JP)
SAKAI YOSHIMI (JP)
USAMI MAMORU (JP)

Application Number:

PCT/JP2002/011810

Publication Date:

May 22, 2003

Filing Date:

November 12, 2002

Export Citation:

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Assignee:

TDK CORP (JP)
YAMAGA KENJI (JP)
SAKAI YOSHIMI (JP)
USAMI MAMORU (JP)

International Classes:

B29C33/00; B29C45/26; B29D17/00; G11B7/26; B29C45/00; (IPC1-7): G11B7/26

Foreign References:

JPH02110840A	1990-04-24
JP2000071301A	2000-03-07
JPH0831023A	1996-02-02
JP2001246643A	2001-09-11
JPH01285321A	1989-11-16
JPH1040584A	1998-02-13
JPH09123223A	1997-05-13

Attorney, Agent or Firm:

Matsuyama, Keisuke (Yoyogi 2-chome Shibuya-ku, Tokyo, JP)

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