Stock material or miscellaneous articles – Magnetic recording component or stock – Magnetic recording media substrate
Reexamination Certificate
2006-06-30
2010-06-01
Bernatz, Kevin M. (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Magnetic recording media substrate
C428S847700, C428S848600, C360S135000, C065S060200
Reexamination Certificate
active
07727645
ABSTRACT:
The invention provides a magnetic recording medium substrate product which enables enhancement of contact strength between a substrate end surface and a soft magnetic layer, as well as suppression of occurrence of corrosion, a magnetic recording medium including the substrate product, which exhibits no deterioration of electromagnetic conversion characteristics and has excellent durability and a magnetic recording and reproducing apparatus including the magnetic recording medium. The magnetic recording medium substrate product includes a disk-shaped non-magnetic substrate having a circular hole in a center portion thereof, and having a chamfer formed at least one of a portion between a main surface on which a magnetic layer is to be formed and an outer end surface and a portion between the main surface and an inner end surface defining the circular hole, wherein the chamfer has a surface roughness (Ra) falling within a range of 4.0 Å≦Ra≦100 Å, preferably 4.0 Å≦Ra≦50 Å, as measured by means of an AFM.
REFERENCES:
patent: 6096405 (2000-08-01), Takahashi et al.
patent: 2002/0055017 (2002-05-01), Fukushima et al.
patent: 2003/0054736 (2003-03-01), Hagan et al.
patent: 2003/0082407 (2003-05-01), Sakawaki et al.
patent: 2003/0104253 (2003-06-01), Osawa et al.
patent: 2004/0038082 (2004-02-01), Tsumori
patent: 2004/0057157 (2004-03-01), Shimizu et al.
patent: 2005/0123805 (2005-06-01), Shimizu et al.
patent: 2005/0204777 (2005-09-01), Mori et al.
patent: 2006/0042317 (2006-03-01), Miyamoto
patent: 1178361 (1998-04-01), None
patent: 9-102120 (1997-04-01), None
patent: 10-154321 (1998-06-01), None
patent: 2002-163817 (2002-06-01), None
patent: 2004-039030 (2004-02-01), None
patent: WO 2004/061829 (2004-07-01), None
Aida Katsuaki
Fukushima Masato
Shimizu Kenji
Bernatz Kevin M.
Falasco Louis
Showa Denko K.K.
Sughrue & Mion, PLLC
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