Patent ID: 8404046

Claim:
A single crystal silicon pulling device, comprising, in a furnace, a cylindrical body surrounding a pulling path of single crystal silicon and a thermal shielding body surrounding the cylindrical body, the single crystal silicon pulling device pulling up the single crystal silicon while supplying gas from an upper part to a lower part in the furnace, the cylindrical body consisting of a thermal adjusting coiled pipe supplied with a medium for thermal adjusting coiled in a helical shape with a single crystal silicon pulling path of single crystal silicon being an approximate center, and a coil complementary member having an upper end being attached along a whole or part of a lower end of the thermal adjusting coiled pipe, and together with the thermal adjusting coiled pipe, forming a coil body to make constant intervals between any part of a lower end of the coil body and the thermal shielding body wherein, S 2 /S 1 is 1.01 or lower, where S 1 is a cross-sectional area of a plane perpendicular to a pulling axis of the single crystal silicon of an annular space formed by a side surface of the single crystal silicon and an inner wall surface of the cylindrical body, and S 2 is an area of a side surface of a portion located between the cylindrical body and the thermal shielding body of a cylindrical space extending downward from a lower end of the cylindrical body.