磁気記録媒体用ガラス基板の製造方法

Japanese Patent JP5624829

B2

The invention provides a method of manufacturing a glass substrate for magnetic recording media. And the glass substrate has high surface smoothness and little waviness. In the primary, secondary and tertiary lapping process, diamond pads 20A, 20B, and 20C are used, respectively. The diamond pad 20A has an average diamond grain size of 4 to 12 μm, and a content of diamond grains of 5 to 70% by volume. The diamond pad 20B has an average diamond grain size of 1 to 5 μm, and a content of diamond grains of 5 to 80% by volume. The diamond pad 20C has an average diamond grain size of 0.2 to 2 μm, and a content of diamond grains of 5 to 80% by volume. In the polishing process, the silicon oxide is used as abrasive without using cerium oxide.

WO/1997/001164	MAGNETIC DISK SUBSTRATE, MAGNETIC DISK, AND PROCESS FOR PRODUCING MAGNETIC DISK SUBSTRATE
JP2010131695	DISK MATERIAL POLISHING METHOD, DISK MATERIAL POLISHING DEVICE, DISK MATERIAL, SUBSTRATE FOR MAGNETIC DISK, AND MAGNETIC DISK
JPH03296918	MAGNETIC RECORDING MEDIUM AND ITS PRODUCTION

羽根田 和幸

JP2010182330A

November 12, 2014

August 17, 2010

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昭和電工株式会社

G11B5/84; B24B37/00; B24D3/00; B24D7/00; C03C19/00

Masatake Shiga
Norio Takahashi
Takashi Watanabe
Mitsuyoshi Suzuki
West Kazuya
Yasuhiko Murayama

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