Chemical apparatus and process disinfecting – deodorizing – preser – Control element responsive to a sensed operating condition – Control element directly mechanically linked to separate sensor
Patent
1984-11-30
1986-10-14
Bernstein, Hiram H.
Chemical apparatus and process disinfecting, deodorizing, preser
Control element responsive to a sensed operating condition
Control element directly mechanically linked to separate sensor
422249, 156601, C30B 1526
Patent
active
046171738
ABSTRACT:
A crystal growing furnace has lift and rotation control apparatus for both a growing crystal 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 longitudinal 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 incrementally 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 incremental angular movement in response to growing the crystal for governing the lift and rotation control apparatus.
REFERENCES:
patent: 3692499 (1972-09-01), Andrychuk
patent: 3740563 (1973-06-01), Reichard
patent: 4207293 (1980-06-01), Scholl et al
Bernstein Hiram H.
FitzGerald Thomas R.
General Signal Corporation
Wynn Harold S.
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