Patent · US Expired

Crystal holder

US5902397A · kind A · utility

1Cited by

4References

4Claims

0Family size

Assignee

Leybold Systems GmbH · DE

Inventors

Winfried Schulman · Kleinostheim, DE
Helmut Kaiser · Wolfratshausen, DE
Franz Thimm · Alzenau, DE

Key dates

Filing date	May 27, 1997
Grant date	May 11, 1999
Priority date	—
Expiry date	May 27, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T117/10
WIPO fieldSurface technology, coating
WIPO sectorChemistry

Abstract

In an apparatus for the production of single crystals (103) by the Czochralski melt drawing method, a gripping device (125a, 125b) is provided, by means of which the crystal (103) is held during the growing process by a pressure which is exerted radially on its lateral surface and which exceeds the frictional resistance, as a result of which the weight of the growing crystal is completely supported. The gripping device (125a, 125b) has at least two holding devices (128a, 128b) arranged opposite each other, which, during the crystal growth phase, initially move parallel to the crystal and then, after a certain desired crystal diameter has been reached, are laid against the crystal by means of the holding devices (128a, 128b) in such a way that the growth the crystal in the area of the melting zone is not disturbed.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.