Title:
METHOD OF DUPLICATING INFORMATION RECORD DISK
Document Type and Number:
Japanese Patent JPS5423501
Kind Code:
A
Abstract:
The process according to the invention uses a matrix engraved by any means, the tracks being perfectly centered on this matrix in relation to a center of rotation. The matrix is placed in a vacuum chamber on a supporting axis capable of rotating and is coated over its entire surface with a polymerizable material which is free from air bubbles and which does not adhere to the constituent material of the matrix. A substrate previously drilled at its center, balanced and coated with a material to which the polymerizable material adheres, is placed on the supporting shaft and held at a distance from the matrix. The vacuum is established in the chamber and the substrate is brought into contact with the matrix. On completion of polymerization outside or inside the chamber, the substrate carrying the moulded resin is readily separated from the matrix.
Inventors:
KUROODO BURIKOO
FURANSOWA RU KARUBANNE
JIERAARU ROBAN
FURANSOWA RU KARUBANNE
JIERAARU ROBAN
Application Number:
JP8928278A
Publication Date:
February 22, 1979
Filing Date:
July 21, 1978
Export Citation:
Assignee:
THOMSON BRANDT
International Classes:
B29C39/00; B29C39/10; B29C39/42; B29C43/00; B29C43/02; B29C61/00; B29D17/00; G11B3/70; G11B7/26; (IPC1-7): B29D17/00; G11B3/70; G11B7/24