Glass manufacturing – Processes – With wearing away of surface material
Reexamination Certificate
2005-04-12
2005-04-12
Griffin, Steven P. (Department: 1731)
Glass manufacturing
Processes
With wearing away of surface material
C065S102000
Reexamination Certificate
active
06877343
ABSTRACT:
In a magnetic recording medium, surface roughness of a glass substrate and the variation of the surface roughness are suppressed to the predetermined range. Namely, the surface roughness (Rmax, Ra, Rq) and the relation (Rmax/Ra) between Rmax and Ra are restricted to the predetermined range. In this event, Ra is representative of a center-line mean roughness, Rmax is defined as a maximum height representative of a difference between a highest point and a lowest point and Rq is representative of a root mean square roughness. Thereby, crystal grains of an underlying layer and a magnetic layer formed thereon are equalized. Specifically, the surface roughness is specified by Rmax≦15 nm, Ra≦1 nm and Rq≦1.5 nm. Further, the ratio between the surface roughness Rmax and the surface roughness Ra is specified by Rmax/Ra≦30.
REFERENCES:
patent: 4908727 (1990-03-01), Ezaki et al.
patent: 5202810 (1993-04-01), Nakamura et al.
patent: 5353182 (1994-10-01), Nakamura et al.
patent: 5388020 (1995-02-01), Nakamura et al.
patent: 5476821 (1995-12-01), Beall et al.
patent: 5567217 (1996-10-01), Goto et al.
patent: 5800931 (1998-09-01), Lee et al.
patent: 5820969 (1998-10-01), Satoh
patent: 5888119 (1999-03-01), Christianson et al.
patent: 6119483 (2000-09-01), Takahashi et al.
patent: 6236542 (2001-05-01), Hartog et al.
patent: 6378338 (2002-04-01), Awaya et al.
patent: 5-303735 (1993-11-01), None
patent: 5-325163 (1993-12-01), None
patent: 7-240025 (1995-09-01), None
patent: 8-293177 (1996-11-01), None
Shaun E. McKinlay et al.; “Microstructure/Magnetic Property Relationship In CoCrPt Magnetic Thin Films”; 1996 IEEE; pp. 3587-3589.
Takahashi Koji
Takano Masao
Watanabe Tsuyoshi
Griffin Steven P.
Hoya Corporation
Lopez Carlos
LandOfFree
Method of manufacturing a glass substrate and a magnetic... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method of manufacturing a glass substrate and a magnetic..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method of manufacturing a glass substrate and a magnetic... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3431476