Title:
MANUFACTURE OF OPTICALLY READABLE DISC TYPE INFORMATION CARRIER
Document Type and Number:
Japanese Patent JPS63285733
Kind Code:
A
Abstract:
In a method of marking optically readable disc-shaped information carriers which are manufactured, for example, by a transfer-moulding process using at least one mould serving as a stamper, which mould has been derived from a master via at least two electroforming replication steps, the mould is provided with a marking for the subsequent indentification of the mould, which marking is situated in an otherwise information-free area of the information carrier to be manufactured and allows the mould thus marked to be identified.
Inventors:
HERUMAN KUUPU
HANSU SHIYUDEKOTSUPUFU
HANSU SHIYUDEKOTSUPUFU
Application Number:
JP10922688A
Publication Date:
November 22, 1988
Filing Date:
May 06, 1988
Export Citation:
Assignee:
PHILIPS & DU PONT OPTICAL
International Classes:
B23K26/00; B29D17/00; B44B7/00; G11B3/70; G11B7/26; (IPC1-7): G11B3/70; G11B7/26
Attorney, Agent or Firm:
Akihide Sugimura (1 outside)