Title:
GLASS SUBSTRATE PRODUCTION METHOD AND GLASS SUBSTRATE PRODUCTION APPARATUS
Document Type and Number:
WIPO Patent Application WO/2015/099143
Kind Code:
A1
Abstract:
A method for producing a glass substrate comprises a step of treating a molten glass containing a clarifying agent, which is an agent capable of releasing oxygen through a reduction reaction, using a treatment apparatus in which at least a part of the inner wall is made from a material containing a platinum-group metal. In the step of treating the molten glass, the amount of oxygen to be released from the molten glass is controlled in a gas phase space formed between the inner wall of the treatment apparatus and the surface of the molten glass, whereby the concentration of oxygen in the gas phase space is so controlled as to prevent the volatilization of the platinum-group metal. In the inside of the treatment apparatus, a released bubble amount maximum position is so adjusted that the released bubble amount maximum position and a highest temperature position are separated from each other as observed in the direction of the flow of the molten glass, wherein the released bubble amount maximum position is a position at which the amount of bubbles released from the surface of the molten glass into the gas phase space becomes maximum and the highest temperature position is a position at which the temperature distribution of the molten glass achieves a peak as determined in the direction of the flow of the molten glass.
Inventors:
SAITO KOSUKE (JP)
GEKKO HITOSHI (JP)
FUJIMOTO SHINGO (JP)
GEKKO HITOSHI (JP)
FUJIMOTO SHINGO (JP)
Application Number:
PCT/JP2014/084587
Publication Date:
July 02, 2015
Filing Date:
December 26, 2014
Export Citation:
Assignee:
AVANSTRATE INC (JP)
International Classes:
C03B5/225
Domestic Patent References:
| WO2012132471A1 | 2012-10-04 |
Foreign References:
| JP2011502934A | 2011-01-27 | |||
| JP2013212942A | 2013-10-17 | |||
| JP2013521205A | 2013-06-10 | |||
| JP2010202444A | 2010-09-16 | |||
| JP2013216531A | 2013-10-24 |
Attorney, Agent or Firm:
GLOBAL IP TOKYO (JP)
Global IP Tokyo patent business corporation (JP)
Global IP Tokyo patent business corporation (JP)
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