Patent ID: 6338757
Filing Date: 2002-01-15
Classification: C30B,Y10S,Y10T

Abstract:
An apparatus for pulling a single crystal, comprising:a crucible to be charged with a melt; a heater arranged around said crucible; a straightening vane, shaped as a side surface of an inverted truncated cone or a cylinder, to surround a pulled single crystal and having a lower end portion to be located above the surface of the melt when the melt is in said crucible; and a ring-shaped heat shield plate fitted to or spaced from an inner wall surface or an outer wall surface of said straightening vane at a position above said lower end portion of said straightening vane, wherein the distance between a bottom surface of said ring-shaped heat shield plate and the surface of the melt, when the melt is in said crucible, is within the range of from 30 mm to 200 mm.