Title:
PRODUCTION OF DISK
Document Type and Number:
Japanese Patent JP2663912
Kind Code:
B2
Abstract:
PURPOSE: To obtain a disk having good information quality by using a stamper of high quality with little defects to produce the disk.
CONSTITUTION: A resist film 2 is formed on a substrate 1 by spin coating method. The resist film 2 is exposed to light by selective irradiation with laser light in the pregroove position and the address position such as track numbers and developed to obtain a pregroove master disk 3. Then, a Ni-vapor deposition film 4 of several 100&angst thickness is formed on the master disk 3 by vacuum vapor deposition method, on which a Ni layer 5 of about 300μm thickness is formed by electroplating method. The Ni layer 5 is peeled from the pregrooved master disk to obtain a stamper 6. This stamper 6 is used as a casting mold to mold a synthetic resin by similar method as the production of music records. Then, a recording medium layer is formed on the obtd. synthetic resin plate. By producing a disk by using the stamper 6 of high quality with little defects, disks having good information quality in which information such as pregrooves and addresses is reproduced with high accuracy can be obtd.
Inventors:
NAKAJIMA MINORU
TSUGAWA IWAO
ETSUNO NAGAAKI
TSUGAWA IWAO
ETSUNO NAGAAKI
Application Number:
JP9897795A
Publication Date:
October 15, 1997
Filing Date:
April 24, 1995
Export Citation:
Assignee:
FUJITSU KK
International Classes:
C25D1/00; G11B7/26; (IPC1-7): G11B7/26
Domestic Patent References:
| JP60187952A |
Attorney, Agent or Firm:
Teiichi