MAGNETIC RECORDING MEDIUM GLASS SUBSTRATE AND METHOD OF PRODUCING THE SAME

WIPO Patent Application WO/2004/042710

A1

A magnetic recording medium glass substrate is formed in disk shape and has on its surface a ridge-like texture (13) extending while describing a concentric circle. The width (W) of the texture (13) of low frequency component obtained by measuring a 10 μm square range by an inter atomic force microscope is 10 - 20 nm, the height (H) of the texture (13) is 2 - 10 nm, and the ratio (Rp / RMS) of the maximum hill height Rp to the root-mean-square roughness (RMS) of the texture (13) is not more than 15. The low frequency component of the texture has a high frequency component superposedly formed thereon, it being preferable that the width (W’) of the texture of such high frequency component be 0.1 - 20 nm, and that its height (H’) be 0.1 - 1 nm.

WO/2012/086256	METHOD OF MANUFACTURING GLASS SUBSTRATE FOR RECORDING MEDIUM
JP2007229912	METHOD OF MANUFACTURING GLASS SUBSTRATE FOR MAGNETIC DISK, GLASS SUBSTRATE FOR MAGNETIC DISK, AND METHOD OF MANUFACTURING MAGNETIC DISK
JPH0656441	INDUSTRIAL APPLICABILITY: Laminated transparent polarized glass and a method for producing the same.

ISHII NORIMASA (JP)
MITANI KAZUISHI (JP)
SAITO YASUHIRO (JP)
OKUHATA KOJI (JP)

PCT/JP2003/013462

May 21, 2004

October 22, 2003

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NIPPON SHEET GLASS CO LTD (JP)
ISHII NORIMASA (JP)
MITANI KAZUISHI (JP)
SAITO YASUHIRO (JP)
OKUHATA KOJI (JP)

C03C19/00; C03C21/00; G11B5/73; G11B5/82; G11B5/84; (IPC1-7): G11B5/73; C03C15/00; C03C19/00; C03C23/00; G11B5/84

JP2002251716A	2002-09-06
JP2001341058A	2001-12-11
JPH05342532A	1993-12-24

Onda, Hironori (Ohmiya-cho 2-chome Gifu-shi, Gifu, JP)

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