System for controlling the diameter of a crystal in a...

C - Chemistry – Metallurgy – 30 – B

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148/1.2

C30B 15/26 (2006.01) C30B 15/30 (2006.01)

Patent

CA 1272105

INVENTOR: Henry C. Latka A SYSTEM FOR CONTROLLING THE DIAMETER OF A CRYSTAL IN A CRYSTAL GROWING FURNACE ABSTRACT OF THE DISCLOSURE A crystal growing furnace has lift and rotation control apparatus for both a growing cyrstal and a crucible containing a melt. A transducer and a servo motor are disposed above the furnace having respective shafts connected along a common horizontal axis on opposite sides of a longitunal light tube wherein the light tube and transducer shaft can be axially positioned by the shaft of the servo motor. The light tube has a lens for focusing at times on a spot on a meniscus in the furnace and at times on the melt, a light sense detector is connected to the light tube for at times generating a servo motor control error signal to drive the servo motor incremen- tally to an angular position corresponding to growth in the diameter of the meniscus by tracking a spot on the meniscus. The transducer generates an output signal indicative of incre- mental angular movement in response to growing the crystal for governing the lift and rotation control apparatus.

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