Glass substrate manufacturing method and glass substrate

• Main Authors: HAMAGAMI, KOU, OKAMOTO, MISATO, KOYAMA, AKIHIRO
• Format: Patent
• Language: Chinese; English
• Published: 01.01.2016
• Subjects: CHEMISTRY; CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION ORPROCESSING OF GOODS; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GLASS; MANUFACTURE, SHAPING, OR SUPPLEMENTARY PROCESSES; METALLURGY; MINERAL OR SLAG WOOL; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINSTCLIMATE CHANGE

The present invention relates to a glass substrate manufacturing method and a glass substrate. The glass substrate manufacturing method can increase the production efficiency and reduce the glass substrate thermal shrinkage rate and lower unevenness of the glass substrate thermal shrinkage rate. During the manufacturing process of the glass substrate, thermal treatment of the glass substrate is performed, and the overall glass substrate is subjected to thermal treatment at a temperature 60 to 260 DEG C lower than the strain point. The overall glass substrate is cooled from the thermal treatment temperature at a first rate down to a temperature 50 to 300 DEG C lower than the thermal treatment temperature, i.e. the middle temperature, and then the overall glass substrate is cooled from the middle temperature at a second rate faster than the first rate down to the room temperature.