MAGNETIC DISC GLASS BLANK FABRICATION METHOD, MAGNETIC DISC GLASS SUBSTRATE FABRICATION METHOD, AND MAGNETIC DISC GLASS BLANK

WIPO Patent Application WO/2014/046240

A1

When fabricating a magnetic disc glass blank, first, a glass gob is dropped, said glass gob being obtained by cutting a liquid glass flow using a pair of cutting blades which are positioned facing one another. A glass blank is formed by the dropping glass gob being clamped with a pair of press faces and press formed. When cutting the liquid glass flow, by moving the pair of cutting blades in a linear manner such that the cutting blades respectively approach one another from opposite sides of the liquid glass flow, the cutting blades gradually cut from one site of an edge part of a liquid glass flow cross-section whereat the cutting blades are adjacent and overlapping in the flow direction of the liquid glass flow, and whereat the liquid glass flow makes contact with both of the cutting blades.

JPS608981	[Title of the Invention] A device for shearing a large number to A gob
JP3708265	PRODUCTION OF MOLTEN GLASS DROP AND PRODUCTION APPARATUS
WO/2009/106059	METHOD AND DEVICE FOR CONSTRICTING, SEPARATING OR GUIDING A FLUID OR CHARGE CARRIER STREAM

HANADA KATSUHIKO (JP)
ISONO HIDEKI (JP)
TANINO HIDEKAZU (JP)
MURAKAMI AKIRA (JP)
SATO TAKASHI (JP)

PCT/JP2013/075470

March 27, 2014

September 20, 2013

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HOYA CORP (JP)

C03B7/12; C03B11/00; G11B5/84

JP2012171864A	2012-09-10
US20120144865A1	2012-06-14

GLOBAL IP TOKYO (JP)
Global IP Tokyo patent business corporation (JP)

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