System for controlling crystal growth apparatus and melt repleni

Details System for controlling crystal growth apparatus and melt repleni System for controlling crystal growth apparatus and melt repleni

1990-03-12

1992-02-04

Kunemund, Robert

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

1566171, 156DIG73, 156DIG98, 156DIG115, 422222, 422249, C30B 1534

Patent

active

050857282

ABSTRACT:
A control system for controlling the operation of a system for replenishing the melt in the crucible of an apparatus for growing tubular crystalline bodies of a selected material. The melt replenishment system comprises a container for storing solid particles of said selected material and a dispenser for transporting the particles from the container to the crucible. The control system controls the rate at which the dispenser transports particles from the container to the crucible based on the weight of the solid particles stored in the container, the weight of the crystalline body, and the pressure inside the crystalline body. Additionally, the control system may be adapted to control the temperature of the crucible heater of the apparatus. Compensation is provided by this invention for weight measurement errors that are created by pressure fluctuations within the tubular crystalline body.

REFERENCES:
patent: 3934983 (1976-01-01), Bardsley et al.
patent: 3980438 (1976-09-01), Castonguay et al.
patent: 4512954 (1985-04-01), Matsui
patent: 4539067 (1985-09-01), Washizuka et al.
patent: 4544528 (1985-10-01), Stormont et al.
patent: 4660149 (1987-04-01), Lissalde et al.
"Automatic Czochralski Growth, Growth Parameters Measurements and Process Control"; W. Uelhoff; Journal of Crystal Growth 65 (1983) pp. 278-279.

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