Electrical resistance heater for crystal growing apparatus

An electrical resistance heater for use in a crystal puller used for growing monocrystalline ingots according to the Czochralski method, the crystal puller having a housing, a crucible in the housing for containing molten source material and a pulling mechanism for pulling a growing ingot upward from the molten source material, the heater comprising a heating element sized and shaped for placement in the housing of the crystal puller for radiating heat within the housing, the heating element having heating segments arranged in a generally side-by-side relationship and being electrically connected together, each heating segment comprising a web and a pair of flanges projecting outwardly from the web and being non-coplanar therewith thereby to reduce the cross-sectional area of the segment for increasing the electrical resistance and power output of the heater, one of said flanges being disposed at an end of the web and the other of said flanges being disposed at an opposing end of the web, the web and flanges being sized relative to each other such that the thickness of the web is substantially less than the width of each of said flanges.

An electrical resistance heater for use in a crystal puller used for growing monocrystalline ingots according to the Czochralski method, the crystal puller having a housing, a crucible in the housing for containing molten source material and a pulling mechanism for pulling a growing ingot upward from the molten source material, the heater comprising a heating element sized and shaped for placement in the housing of the crystal puller for radiating heat within the housing, the heating element having heating segments arranged in a generally side-by-side relationship and being electrically connected together, each heating segment comprising a web and a flange projecting outwardly from the web and being non-coplanar therewith thereby to reduce the cross-sectional area of the segment for increasing the electrical resistance and power output of the heater, said heating segments comprising first and second heating segments, each heating segment having an upper end and a lower end, the second heating segment having a length substantially greater than the first heating segment and being arranged relative to the first segment so that when the heating element is placed in the housing the lower end of the second segment is disposed closer to the molten silicon in the crucible than the lower end of the first segment when the heating element is placed in the housing.