Stock material or miscellaneous articles – Magnetic recording component or stock – Magnetic recording media substrate
Reexamination Certificate
2005-09-16
2009-11-24
Tarazano, D. Lawrence (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Magnetic recording media substrate
C428S848600, C451S036000
Reexamination Certificate
active
07622206
ABSTRACT:
To provide a substrate which is not substantially chipped or cracked on the substrate end faces even when the substrate is a silicon substrate made of a brittle material, and provide a substrate which prevents dust raising from the substrate end faces and prevents dust raising due to rubbing with a processing cassette.A silicon substrate for a magnetic recording medium is formed by setting the lengths L of chamfered portions between the main surfaces of the substrate and the outer circumferential side end face to 0.1±0.03 mm and setting the angles α between the main surfaces and the chamfered portions between the main surfaces and the outer circumferential side end face to 45 degrees ±5 degrees. It is also possible for a curved portion with a radius of 0.01 mm or more and less than 0.3 mm is interposed between the main surfaces and the outer circumferential side chamfered portions of the substrate.
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Aida Katsuaki
Haneda Kazuyuki
Machida Hiroyuki
Falasco Louis
Showa Denko K.K.
Sughrue & Mion, PLLC
Tarazano D. Lawrence
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