Device for pulling crystals

Details Device for pulling crystals Device for pulling crystals

1991-08-20

1993-08-10

Kunemund, Robert

Chemical apparatus and process disinfecting, deodorizing, preser

Chemical reactor

Including specific material of construction

156600, 156601, 1566171, 156DIG91, 156DIG98, 1566181, 422252, B01J 1710

Patent

active

052346641

ABSTRACT:
A pulling shaft carries a seed crystal holder and moves it vertically to pull a crystal upward from a melt in a crucible. The pulling shaft is rotated by a drive to cause the crystal to rotate while being pulled. A slippage device is provided to permit a difference between rotational speeds of the pulling shaft and the seed crystal. The slippage device may be incorporated in a crystal holder having an inner holder fixed to the seed crystal, an outer holder fixed to the shaft, and a friction bearing therebetween which prevents undue torsional stress from being transmitted to the crystal.

REFERENCES:
patent: 4190630 (1980-02-01), Apilat et al.
patent: 4569828 (1986-02-01), Nishizawa
patent: 5009864 (1991-04-01), Ibe et al.
patent: 5089239 (1992-02-01), Mizuishi et al.
JP 2-279586A In: Patent Abstracts of Japan, C-802, Feb. 5, 1991, vol. 15/No. 48.

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