Stock material or miscellaneous articles – Magnetic recording component or stock – Magnetic recording media substrate
Reexamination Certificate
2003-10-22
2008-12-30
Chaney, Carol (Department: 1794)
Stock material or miscellaneous articles
Magnetic recording component or stock
Magnetic recording media substrate
C428S848200, C428S410000, C360S135000
Reexamination Certificate
active
07470476
ABSTRACT:
A glass substrate for a magnetic recording medium is formed to have a disc shape and includes ridge shaped textures13extending along concentric circles on a main surface. When measuring a 10 μm square range with an atomic force microscope, the textures have a width W that is between 10 and 200 nm. The textures have a height H that is between 2 and 10 nm. Further, the textures have a ratio (Rp/RMs) of a maximum mountain height with respect to a root mean square roughness that is less than or equal to 15. The textures include high frequency components superimposed on the low frequency components. It is preferable that the textures of the high frequency components have a width W′ that is between 0.1 and 20 nm, and the textures of the high frequency components have a height H′ that is between 0.1 and 1 nm.
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U.S. Appl. No. 10/532,564 entitled “Glass Substrate for Information Recording Medium and Method for Manufacturing Same,” filed Apr. 22, 2005.
U.S. Appl. No. 10/532,538 entitled “Glass Substrate for Information Recording Medium and Method for Manufacturing Same,” filed Apr. 22, 2005.
Ishii Norimasa
Mitani Kazuishi
Okuhata Koji
Saito Yasuhiro
Chaney Carol
Falasco Louis
Hoya Corporation
Workman Nydegger
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