Substrate for information recording disk, mold and stamper for i

Details Substrate for information recording disk, mold and stamper for i Substrate for information recording disk, mold and stamper for i

1998-04-30

2000-10-03

Evans, Elizabeth

Stock material or miscellaneous articles

Circular sheet or circular blank

43027011, B32B 300

Patent

active

061270172

ABSTRACT:
A cavity surface-forming plate of a mold for injection-molding a plastic substrate is coarsely polished, and then a surface for defining a cavity is applied with electroless Ni-P plating. The surface of the plating is polished with abrasive grains to obtain surface roughness of Ra.ltoreq.2.0 nm and Rmax.ltoreq.22 nm. The plastic substrate molded with the mold has smoothness equivalent to the polished plating surface. A concave-convex pattern for forming pits may be formed on the cavity surface. A magnetic disk or an optical disk provided with the substrate makes it possible to realize the near contact system for a magnetic or magneto-optical head. Thus, it is possible to realize high density recording.

REFERENCES:
patent: 5714218 (1998-02-01), Nishio
patent: 5972461 (1999-10-01), Sandstrom
patent: 5981015 (1999-11-01), Zou et al.

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