Heating apparatus having ellipsoidal reflecting mirror

Details Heating apparatus having ellipsoidal reflecting mirror Heating apparatus having ellipsoidal reflecting mirror

1978-04-20

1980-01-15

Reynolds, Bruce A.

Electric heating

Heating devices

Combined with container, enclosure, or support for material...

219348, 219405, 156620, H05B 100

Patent

active

041840658

ABSTRACT:
A heating apparatus especially suitable for use in a crystal growth system, comprises a combination of a high pressure xenon arc discharge lamp and an ellipsoidal reflecting mirror having first and second focal points to heat a material feed rod by concentrated infrared radiation from the xenon lamp. The reflecting mirror is divided into at least two mirror portions between which a substantially straight additional part of a predetermined length is interpositioned. The additional part makes the distance between the two foci longer by said predetermined length. The center positions of the xenon lamp and the feed rod are located respectively at points apart from each of the focal points toward each other at a distance corresponding to the predetermined length, so as to obtain a desirable temperature distribution around the rod relative to a major horizontal axial plane of the ellipsoidal reflecting mirror. In addition, a quarter mirror portion behind the xenon lamp is shifted up or downwardly to defocus the image of the radiant heat for achieving a desirable temperature distribution in a vertical plane.

REFERENCES:
patent: 3001055 (1961-09-01), Lozier et al.
patent: 3460930 (1969-08-01), Pityo
patent: 3600553 (1971-08-01), Costello
patent: 3761677 (1973-09-01), Mizutani et al.
patent: 3763348 (1973-10-01), Costello
patent: 3801773 (1974-04-01), Matsumi
patent: 3983039 (1976-09-01), Eastland

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