METHOD OF MANUFACTURING GLASS BLANK FOR MAGNETIC RECORDING MEDIUM GLASS SUBSTRATE, MAGNETIC RECORDING MEDIUM GLASS SUBSTRATE MANUFACTURING METHOD, MAGNETIC RECORDING MEDIUM MANUFACTURING METHOD, AND DEVICE FOR MANUFACTURING GLASS BLANK FOR MAGNETIC RECORDING MEDIUM GLASS SUBSTRATE

WIPO Patent Application WO/2012/043704

A1

To achieve improvement in evenness, provided are a method of manufacturing a glass blank for a magnetic recording medium glass substrate, and a magnetic recording medium glass substrate manufacturing method, a magnetic recording medium recording method, and a device for manufacturing a glass blank for a magnetic recording medium glass substrate, which employ said method of manufacturing a glass blank for a magnetic recording medium glass substrate, wherein: a pair of press-forming molds, which are positioned in opposition in the horizontal direction upon a piece of molten glass, and having effectively identical press-forming faces and press-forming face temperatures, are brought into approximately simultaneous contact with the piece of molten glass, press-forming same, producing a glass sheet; and the continuous time of the pressing of the glass sheet is controlled such that, upon extracting the glass sheet after sustained pressing thereof by the pair of molds, the evenness of the glass blank is 10μm or less.

JP2002342918	METHOD OF MEASURING SURFACE LUBRICANT OF MAGNETIC DISK MEDIUM
JPS5845375	FORMATION OF THIN FILM BY VAPOR DEPOSITION
WO/2012/042725	GLASS SUBSTRATE FOR INFORMATION RECORDING MEDIUM, MANUFACTURING METHOD FOR SAME, INFORMATION RECORDING MEDIUM, AND INFORMATION DISC DEVICE

MURAKAMI AKIRA (JP)
OSAWA MAKOTO (JP)
SUGIYAMA NOBUHIRO (JP)
SATOU TAKASHI (JP)
TANINO HIDEKAZU (JP)
ISONO HIDEKI (JP)
OSAKABE KINOBU (JP)
MOTOHASHI TAKAO (JP)

PCT/JP2011/072337

April 05, 2012

September 29, 2011

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HOYA CORP (JP)
MURAKAMI AKIRA (JP)
OSAWA MAKOTO (JP)
SUGIYAMA NOBUHIRO (JP)
SATOU TAKASHI (JP)
TANINO HIDEKAZU (JP)
ISONO HIDEKI (JP)
OSAKABE KINOBU (JP)
MOTOHASHI TAKAO (JP)

G11B5/84; B30B9/00; C03B11/00

JP2005263574A	2005-09-29
JP2003128425A	2003-05-08
JP2008174401A	2008-07-31
JP2004059355A	2004-02-26
JPH01148717A	1989-06-12
JP2009149477A	2009-07-09

IAT WORLD PATENT LAW FIRM (JP)
Eye アット international patent business corporation (JP)

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