Patent ID: 6758901
Filing Date: 2004-07-06
Classification: C30B,Y10S,Y10T

Abstract:
A crystal support for supporting a crystal ingot while pulling a single crystal according to the Czochralski method, the crystal support comprising: a central pulling element; a second pulling element having an upper end and a lower end, the second pulling element displaceably mounted with respect to the central pulling element and having a longitudinal upright axis; and at least two rotatably mounted bearings situated at the same height relative to the second pulling element, the rotatable bearings symmetrically connected to the lower end of the second pulling element, each rotatable bearing having a first end, wherein the rotatable bearings can be moved against a passive control element by an active control element, wherein the at least two rotatably mounted bearings are selectively movable between a starting position, in which a portion of the passive control element is in urging contact with a portion of the rotatable bearing such that the first end of the rotatable bearing is rotated upwards towards the upper end of the second pulling element and away from the longitudinal upright axis of the second pulling element, and a support position, in which a portion of the active control element is in urging contact with a portion of the rotatable bearing such that the rotatable bearing is rotated away from the upper end of the second pulling element and toward the longitudinal upright axis of the second pulling element, and wherein the second pulling element is movable relative to the central pulling element such that second pulling element is spaced from the central pulling element and the at least two rotatably mounted bearings are selectively moved from the support position to the starting position.