Glass manufacturing – With signal – indicator – inspection means – register – or recorder
Patent
1980-05-12
1981-07-28
Fisher, Richard V.
Glass manufacturing
With signal, indicator, inspection means, register, or recorder
65 3A, 65160, 427 8, 427163, 427237, 118665, 118725, 118730, 118733, B05C 700, B05D 722
Patent
active
042808294
ABSTRACT:
This invention pertains to an apparatus for controlling the diameter of a glass bait tube during the deposition of glassy layers therein. The exhaust end of the bait tube is connected to a vented chamber. A gas source is connected to the chamber by a mass flow controller. A moving hot zone is generated within the bait tube while reactant gases flow therethrough in order to form uniform glassy deposits within the bait tube. An outer diameter monitor measures the bait tube diameter within the hot zone and provides an output signal to a controller which compares the output signal to a set point and provides a control signal to the mass flow controller. By varying the flow of gas into the chamber, the pressure within the bait tube is maintained at the level necessary to provide the desired tube diameter.
REFERENCES:
patent: 3134694 (1964-05-01), Grabmaier
patent: 3907536 (1975-09-01), Achener
patent: 4154591 (1979-05-01), French et al.
patent: 4165224 (1979-08-01), Irven et al.
patent: 4199335 (1980-04-01), Gliemeroth et al.
Okada et al., "Improved Chemical Vapor Deposition. . .", Electronics Letters, vol. 14, No. 4; Feb. 16, 1978; pp. 89, 90.
Corning Glass Works
Fisher Richard V.
Simmons, Jr. William J.
Zebrowski Walter S.
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