Method for producing glass substrate for magnetic disk and method for manufacturing magnetic disk

Number of patents in Portfolio can not be more than 2000

United States of America Patent

PATENT NO 8763428
APP PUB NO 20090158775A1
SERIAL NO

12088851

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Abstract

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When mirror polishing is performed on a glass substrate by bringing a polishing pad into contact with the surface of the glass substrate while supplying a polishing liquid containing polishing grains to the substrate surface, the pH of the polishing liquid is maintained within a certain range or the agglomeration degree or dispersion degree of the polishing liquid is controlled. Consequently, an adequate mirror polishing rate can be maintained and there can be obtained a glass substrate having a good end shape.

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Patent Owner(s)

  • HOYA CORPORATION

International Classification(s)

Inventor(s)

Inventor Name Address # of filed Patents Total Citations
Katagiri, Masahiro Shinjuku-ku, JP 15 284
Koshimizu, Takumi Shinjuku-ku, JP 2 12
Marumo, Yoshinori Shinjuku-ku, JP 19 154
Takizawa, Toshio Shinjuku-ku, JP 35 326

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