Patent ID: 6022411
Filing Date: 2000-02-08
Classification: C30B,Y10S,Y10T

Abstract:
A single crystal pulling apparatus, comprising:seed crystal pulling means for pulling a seed crystal while rotating a seed crystal holder for supporting the seed crystal;a contact member rotatable together with said seed crystal holder and movable in vertical direction, and having a function to push down a portion with a larger diameter of a single crystal from above after an upper surface of said portion with a larger diameter of the single crystal formed under said seed crystal by pulling using said seed crystal pulling means is contactably arranged;a gripping member rotatable together with said seed crystal holder and said contact member and movable in vertical direction and having a tip thereof opened or closed to grip a constricted portion of the single crystal formed under said portion with a larger diameter by pulling using said seed crystal pulling means; andmoving means for moving a tip of said gripping member toward a lower surface of said portion with a larger diameter so that, when said upper surface of said portion with a larger diameter of the single crystal under pulling is brought into contact with said contact member a tip of said gripping member is closed and said constricted portion is gripped by a cooperative action with said contact member.