Patent ID: 9422635
Filing Date: 2016-08-23
CPC Classification: C30B,Y10T

Claim Text:
1. A single crystal production apparatus using a Czochralski method, the single crystal production apparatus comprising: a crucible for holding raw material melt; a pedestal that supports the crucible and can be moved upward and downward; a crucible rotating shaft for rotating the crucible via the pedestal; and a melt receiver that is disposed below the crucible and provided with a center sleeve surrounding the pedestal, wherein on an outer periphery of the pedestal and an inner periphery of the center sleeve, two or more grooves for preventing the raw material melt leaking from the crucible from dripping are provided, the grooves of any one or both of the pedestal and the center sleeve have a depth of 2 mm or more and 10 mm or less and a width of 5 mm or more and 20 mm or less, and a spacing between the grooves is 5 mm or more and 20 mm or less, and a space between an outermost surface of the pedestal and an innermost surface of the center sleeve is 2 mm or more and 5 mm or less.