Magnetic disk substrate and production method of magnetic disk

Details Magnetic disk substrate and production method of magnetic disk Magnetic disk substrate and production method of magnetic disk

2005-08-26

2010-02-16

Bernatz, Kevin M. (Department: 1794)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C065S061000

Reexamination Certificate

active

07662493

ABSTRACT:
The invention provides a magnetic disk glass substrate capable of preventing the occurrence of dust and adhesion of particles to the magnetic disk surface during a magnetic disk production process, a production method and a magnetic disk.A glass substrate for a magnetic disk has a construction in which an outer peripheral edge shape formed around a peripheral edge portion of a main surface has, with another flat portion of the main surface being the reference:an outer peripheral edge portion ski jump value of not greater than 0 μm;an outer peripheral edge portion roll-off value of −0.2 to 0.0 μm; andan outer peripheral edge portion dub-off value of 0 to 120 Å; andthe glass substrate has a chamfer surface between the main surface (data surface) and the outer peripheral edge surface (straight surface), and has an R surface having a radius of curvature of 0.013 to 0.080 mm between the data surface and the chamfer surface of the glass substrate.

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patent: 2001-148116 (2001-05-01), None
patent: 2001-291229 (2001-10-01), None
JA 2003-342556 translation.
JA 2001-291229 translation.

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