Magnetic disk substrate and magnetic recording medium thereof

Details Magnetic disk substrate and magnetic recording medium thereof Magnetic disk substrate and magnetic recording medium thereof

2006-11-29

2010-12-21

Bernatz, Kevin M. (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S848200, C360S135000, C065S061000

Reexamination Certificate

active

07855002

ABSTRACT:
The present invention relates to a magnetic disk substrate, in which an amplitude Wa of a waviness on a surface measured by using an interferometer for a versatile disk at a measuring wave-length of 5.0 mm is within the range of 0.1 nm to 0.5 nm, an average amplitude Wb of a microwaviness generated on the waviness measured by using a microscopy for three-dimensional surface-structural analysis at a measuring wave-length of 30 μm to 200 μm is 0.3 nm or less, and a value calculated by dividing the average amplitude Wb of the microwaviness by the amplitude Wa of the waviness is 0.6 or more.

REFERENCES:
patent: 2002/0159077 (2002-10-01), Sakaguchi et al.
patent: 2002/0164505 (2002-11-01), Yokoyama et al.
patent: 2003/0172677 (2003-09-01), Miyamoto et al.
patent: 2004/0123527 (2004-07-01), Kitayama et al.
patent: 2004/0162012 (2004-08-01), Suenaga et al.
patent: 2006/0194080 (2006-08-01), Ishii et al.
patent: 06-096436 (1994-04-01), None
patent: 2000-207733 (2000-07-01), None
patent: 2003-223711 (2003-08-01), None
patent: 2006/022443 (2006-03-01), None
Translation Okuda et al JP 2000-207733 (Jul. 2000).
Translation Minami et al JP 2003-223711 (Aug. 2008).

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