METHOD OF MELT TEMPERATURE MEASURING AND ITS MEASURING DEVICD FOR GROWING SAPPHIRE SINGLE CRYSTAL

• Main Author: EOM, IL SOO
• Format: Patent
• Language: English; Korean
• Published: 21.03.2014
• Subjects: AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUSPOLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR; BASIC ELECTRIC ELEMENTS; CHEMISTRY; CRYSTAL GROWTH; ELECTRIC SOLID STATE DEVICES NOT OTHERWISE PROVIDED FOR; ELECTRICITY; METALLURGY; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; REFINING BY ZONE-MELTING OF MATERIAL; SEMICONDUCTOR DEVICES; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITHDEFINED STRUCTURE; SINGLE-CRYSTAL-GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL ORUNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL

The present invention relates to a method and an apparatus of measuring a temperature of a melt for production of sapphire in which the temperature of a central bottom portion of a crucible receiving and coming in contact with the melt is measured to precisely control the temperature of the melt. The measuring device includes: a driving shaft supporting a crucible of the apparatus for producing sapphire; a hollow portion formed inside a longitudinal direction of the driving shaft and having a predetermined inner diameter; a heat shield and light transmissive member installed at a lower end portion of the driving shaft; a temperature measuring means installed at a lower portion of the driving shaft to be oriented toward the central bottom surface of the crucible and measuring the temperature; a flange fixing the heat shield and light transmissive member; and an O-ring installed between the driving shaft and the flange to maintain vacuum of the hollow portion. The temperature measuring means is one of a heat-sensitive thermometer, an infrared thermometer, an infrared radiation thermometer, a two-color (black and white) pyrometer, and an infrared CCD camera, and the heat shield and light transmissive member is made of transparent quartz having high heat-resistance.