Patent ID: 9217208
Filing Date: 2015-12-22
Classification: C30B,Y10T

Abstract:
1. An apparatus for producing a single crystal, growing the single crystal by the Czochralski method and comprising at least: a main chamber in which a crucible for accommodating a raw material melt and a heater for heating the raw material melt are arranged; a pulling chamber into which the grown single crystal is pulled and accommodated, the pulling chamber being continuously provided above the main chamber; a cooling cylinder extending at least from a ceiling of the main chamber toward a surface of the raw material melt so as to surround the single crystal during pulling, the cooling cylinder being forcibly cooled with a cooling medium, and an auxiliary cooling cylinder fitted into an inside of the cooling cylinder, wherein, the auxiliary cooling cylinder has a slit in a wall of the auxiliary cooling cylinder, the slit penetrating in an axial direction from a top surface of the auxiliary cooling cylinder to a bottom surface of the auxiliary cooling cylinder.