Fishing – trapping – and vermin destroying
Patent
1996-11-04
1997-10-28
Bowers, Jr., Charles L.
Fishing, trapping, and vermin destroying
437 8, 117 38, 117 39, H01L 2100
Patent
active
056817584
ABSTRACT:
A method of supplying raw material for fabricating semiconductor single crystal according to the continuously charged method provides an inventive method to overcome the problems of the raw material being charged either insufficiently or excessively, and to charge the raw material steadily. According to the inventive method, the raw material of two polysilicon bars is melted simultaneously and flows to the crucible. By calculating the difference between the weight of the growing single crystal and that of the molten raw material, the insufficiency or excess of the raw material charged is obtained, thereby inducing the equivalent regulation. Further, the coordinates of the tips of the raw material of two polysilicon bars while molten is taken to control the power of the two heaters which melt the polysilicon bars respectively for keeping the coordinates of the two tips in a constant position. The supply rates and the coordinates of the two polysilicon bars are under control, so adequate raw material is charged to grow the single crystal.
REFERENCES:
patent: 4708764 (1987-11-01), Boden et al.
patent: 5248377 (1993-09-01), Ting
patent: 5597737 (1997-01-01), Greer et al.
Bowers Jr. Charles L.
Komatsu Electronic Metals Co. Ltd.
Paladugu Ramamohan Rao
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