Method of controlling floating zone

Details Method of controlling floating zone Method of controlling floating zone

1988-12-05

1990-06-05

MacDonald, Allen

Boots, shoes, and leggings

219 1043, 219 1077, 373139, 156615, 1566171, 382 8, H05B 500, H05B 508

Patent

active

049319450

ABSTRACT:
A method of controlling a floating zone applied to a crystal manufacturing system based on the FZ method and designed to enable the diameter at the crystallization boundary and the axial length of the floating zone or other similar quantities to desired values, in which a floating zone (20) is imaged with an imaging device (30); geometric quantities of the floating zone is measured from the image thereby obtained; the electric power (P) supplied to an induction heating coil (12) and the speed (V.sub.p) at which a raw-material rod (16) is moved relative to the induction heating coil so that the geometric quantities become equal to desired values. The geometric values include one Z.sub.i of the axial length of the floating zone, the distance (L) between the induction heating coil and a crystallization boundary (24) and the diameter (D.sub.n) of a melt neck portion located on the side of the crystallization boundary at a predetermined distance from the induction heating coil, and one D.sub.i of the diameter (D.sub.s) of the crystallization boundary and the diameter (D.sub.m) of a melt shoulder portion (34) located between the crystallization boundary and the restricted portions at a predetermined distance (h.sub.m) from the crystallization boundary.

REFERENCES:
patent: 2992311 (1961-07-01), Keller
patent: 3198929 (1965-08-01), Stut
patent: 3243509 (1966-04-01), Stut
patent: 3757071 (1973-09-01), Stut
patent: 3814827 (1974-06-01), Stut
patent: 4162367 (1979-07-01), Ticak et al.

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