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Patent Searching and Data


Title:
MANUFACTURE OF OPTICAL DISK
Document Type and Number:
Japanese Patent JPH01211342
Kind Code:
A
Abstract:

PURPOSE: To improve the fitting accuracy of a center hub to a disk substrate by firmly forming a photopolymer layer to which a track pattern is transferred on the disk substrate and, at the same time, by fixing the center hub to the disk base plate by adhesion.

CONSTITUTION: A fluid photopolymer 5 is applied to the upper surface 1a of a disk 1 on which a track pattern 2 is formed and a disk substrate 11 provided with a center hole 11a, whose diameter is sufficiently larger than that of a projecting section 3, is put on the upper surface 1a of the disk 1, with the center of the substrate 11 being nearly aligned to that of the disk 1. Then a transparent center hub 12 provided with a hole 12b for engagement which can be tightly engaged with the projecting section 3 under a discoidal flange section 12c and a cylindrical section 12d, whose diameter is smaller than that of the center hole 11a of the substrate 11, is engaged with projecting section 3. Then they are pressed by using a stamper 4 and the track pattern 2 on the disk 1 is transferred to the photopolymer 5. After transferring the track pattern 2, the photopolymer 5 is hardened by exposing the photopolymer 5 to ultraviolet rays R. Therefore, the center of the center hub 12 which is driven and the rotational center of the track pattern 2 are accurately aligned to each other.


Inventors:
OHIRA TAKUJI
Application Number:
JP3771188A
Publication Date:
August 24, 1989
Filing Date:
February 19, 1988
Export Citation:
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Assignee:
VICTOR COMPANY OF JAPAN
International Classes:
B29D17/00; G11B7/26; (IPC1-7): B29D17/00; G11B7/26