Glass substrate for magnetic disk and magnetic disk apparatus

Details Glass substrate for magnetic disk and magnetic disk apparatus Glass substrate for magnetic disk and magnetic disk apparatus

2011-07-26

2011-07-26

Bernatz, Kevin M. (Department: 1785)

Stock material or miscellaneous articles

Magnetic recording component or stock

Magnetic recording media substrate

C428S846900, C428S848200, C360S135000

Reexamination Certificate

active

07985494

ABSTRACT:
A glass substrate for a magnetic disk satisfies Ra1≦0.8 [nm], 0 [nm]≦Ra1−Ra2≦0.2 [nm], Wa1≦0.6 [nm], and 0 [nm]≦Wa2−Wa1≦0.2 [nm]. Ra1is an average surface roughness of a first annular area between 1 mm and 3 mm outward from an inner periphery of a main surface of the glass substrate, Ra2is an average surface roughness of a second annular area between 1 mm and 3 mm inward from an outer periphery of the main surface, Wa1is an average waviness of the first area in a circumferential direction of the glass substrate having a cycle of 300 μm to 5 mm, and Wa2is an average waviness of the second area in the circumferential direction having a cycle of 300 μm to 5 mm.

REFERENCES:
patent: 2003/0067706 (2003-04-01), Gillis et al.
patent: 2003/0172677 (2003-09-01), Miyamoto et al.
patent: 2005/0074635 (2005-04-01), Mitani et al.
patent: 2007/0003796 (2007-01-01), Isono et al.
patent: 2007/0003799 (2007-01-01), Ogiwara et al.
patent: 2007/0202312 (2007-08-01), Kim et al.
patent: 2007/0224821 (2007-09-01), Koyata et al.
patent: 2007/0243421 (2007-10-01), Machida et al.
patent: 2007/0247739 (2007-10-01), Iida
patent: 2007/0251270 (2007-11-01), Miyatani et al.
patent: 2007/0271957 (2007-11-01), Nakamura et al.
patent: 2008/0020238 (2008-01-01), Tanaka et al.
patent: 2008/0166597 (2008-07-01), Osawa
patent: 2008/0216515 (2008-09-01), Kumada et al.
patent: 2009/0100874 (2009-04-01), Tateishi et al.
patent: 2009/0122448 (2009-05-01), Kuraseko et al.
patent: 2005-317181 (2005-11-01), None
patent: 2007-12157 (2007-01-01), None
patent: 2007-126302 (2007-05-01), None

Affiliated with

Also associated with

Rating

Glass substrate for magnetic disk and magnetic disk apparatus does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Glass substrate for magnetic disk and magnetic disk apparatus, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Glass substrate for magnetic disk and magnetic disk apparatus will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-2722446