Weighing cell apparatus for diameter control of a rotatable grow

Details Weighing cell apparatus for diameter control of a rotatable grow Weighing cell apparatus for diameter control of a rotatable grow

1973-09-07

1976-01-27

Yudkoff, Norman

Chemistry: physical processes

Physical processes

Crystallization

23301SP, 156601, B01J 1700, B01J 1720

Patent

active

039349837

ABSTRACT:
Apparatus for the closed-loop controlled growth of crystalline material by the Czochralski technique includes means for establishing a melt of a given crystallisable material, means for pulling a crystal from said melt when established, said means for pulling incorporating a rigid elongated pulling member defining a crystal pulling axis, means for rotating said pulling member about said crystal pulling axis and a weighing cell located at the end of said pulling member distant from said means for establishing a melt and capable of providing, for the purpose of closed-loop control of said crystal pulled, a signal related to the force along said crystal pulling axis on the pulling member.
The weighing cell is preferably one of the kind having a spring and a transducer arranged to produce an electrical output related to the tension of the spring. The pulling member is preferably freely suspended from the weighing cell by a coupling which allows the pulling member to be rotated without rotating the weighing cell.

REFERENCES:
patent: 2558281 (1971-01-01), Dyer
patent: 2908004 (1959-10-01), Levinson
patent: 3206286 (1965-09-01), Bennet et al.
patent: 3259467 (1966-07-01), Rummel
patent: 3265470 (1966-08-01), Keller
patent: 3275419 (1966-09-01), Spielman
patent: 3284172 (1966-11-01), Binder
patent: 3700412 (1972-10-01), Higashi et al.
patent: 3761692 (1973-09-01), Cope

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