Apparatus for heating a preform from which lightguide fiber is d

Details Apparatus for heating a preform from which lightguide fiber is d Apparatus for heating a preform from which lightguide fiber is d

1984-02-24

1985-10-15

Envall, Jr., Roy N.

Electric heating

Metal heating

Of cylinders

219 1057, 65 13, 6537413, 427 451, 373 27, 373138, H05B 500, H05B 600

Patent

active

045476446

ABSTRACT:
An induction furnace (60) for reflowing a portion of an optical preform (12) in order to draw a lightguide fiber (11) therefrom includes a tubular susceptor (80) which is disposed centrally within a beaker (75) and a sleeve (82) which is disposed concentrically about the susceptor. The sleeve is spaced from the susceptor and is surrounded by insulating grain (83). A high frequency coil (84) is energized to couple its electromagnetic field to the susceptor to heat and reflow a portion of the preform. The movement of contaminating particles of the insulating grain into the interior of the susceptor is prevented substantially by annular, felt-like discs (91, 105) at the bottom and top of the beaker. The discs collect particulates which move downwardly and upwardly and because of their compliant engagement with the beaker and with the sleeve, they provide seals at those interfaces. The discs also are effective to prevent inadvertent lateral movement of the sleeve to maintain the concentricity of the sleeve and the susceptor. The top of the furnace is provided with a cap (93) which is supported by the susceptor that extends into a stepped opening of the cap.

REFERENCES:
patent: 4119088 (1978-10-01), Sim
patent: 4126436 (1978-11-01), Bailey
patent: 4142063 (1979-02-01), Boniort et al.
patent: 4409263 (1983-10-01), Aloisio et al.
patent: 4450333 (1984-05-01), Andrejco et al.

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