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Title:
ELECTROCASTING METHOD
Document Type and Number:
Japanese Patent JPH03180483
Kind Code:
A
Abstract:
PURPOSE:To easily produce a stamper without its pit being damaged at the peeling stage in producing the stamper for an optical disk, etc., by Ni electrocasting by using a nickel sulfamate bath as a plating soln. and gradually decreasing its pH as electrocasting proceeds. CONSTITUTION:A master stamper 1 is fixed to the cathode rotating jig 5 of an electrocasting device, the jig is rotate on a rotating shaft 4 in the Ni plating soln. 6 introduced from the discharge port 8 of an anode pellet part 7 and energized to deposit Ni on the stamper 5 as an Ni layer by electrocasting, and a mother stamper is peeled from the stamper 1 to produce an Ni stamper. In this case, a nickel sulfamate soln. is used as the plating soln., the pH is decreased from initial 4.0 to 3.0 as electrocasting proceeds to form an Ni electrocast layer having >=200mum thickness, the mother stamper 2 is formed from the master stamper 1, and an Ni son stamper 3 is produced based on the mother stamper 2. A good-quality Ni stamper almost without the pit being damaged is produced.

Inventors:
FUJITA SHIGERU
KATO TADASHI
Application Number:
JP31766489A
Publication Date:
August 06, 1991
Filing Date:
December 08, 1989
Export Citation:
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Assignee:
RICOH CO LTD
International Classes:
C25D1/00; C25D1/20; G11B7/26; (IPC1-7): C25D1/00; G11B7/26



 
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