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Patent Searching and Data


Title:
PRODUCTION OF OPTICAL DISK
Document Type and Number:
Japanese Patent JPH04265545
Kind Code:
A
Abstract:

PURPOSE: To prevent deformation of a disk in the laminating process by adhering a hot-melt type adhesive while sticking boards for disks are heated so as to straighten the disks from warpage due to application of the adhesive by heating the opposite surface to the adhered surface.

CONSTITUTION: A hot-melt type adhesive 8 is applied on the lower side of an upper disk 5a and on the upper side of the lower disk 5b of two polycarbonate disks. These disks are heated by heaters 9a, 9b to the temp. lower than the glass transition temp. of the resin of the disks but higher as possible so that the mechanical deformation of the disks appearing after application of the adhesive 8 is eliminated. Then the sticking boards disks 10, 11 in this state are made to approach to each other while heated and pressed with 100kg load. Thereby, disks 5a, 5b having little mechanical deformation can be obtd.


Inventors:
MIYASHITA HIDEO
TOBISAWA TAKESHI
MIYAHARA TETSUKUNI
SHIMIZU HIROSHI
TSUKADA MASAKAZU
Application Number:
JP2456791A
Publication Date:
September 21, 1992
Filing Date:
February 19, 1991
Export Citation:
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Assignee:
DAINIPPON INK & CHEMICALS
NIPPON KOKAN KK
International Classes:
G11B7/26; (IPC1-7): G11B7/26
Attorney, Agent or Firm:
Takahashi victory