Cast pedestal with heating element and coaxial heat exchanger
First Claim
1. A pedestal for maintaining a workpiece exposed to an external heat source at a uniform temperature comprising a heat transfer assembly, said heat transfer assembly comprising:
- a) a heating element for controlling the workpiece temperature;
b) a cooling element for removing heat generated by the heat source, said cooling element using a coolant having a boiling temperature of less than 200°
C. as a heat-transfer fluid; and
c) a heat resistant layer located between the heating and cooling elements;
said layer having a calibrated heat resistance such that coolant in the cooling element does not boil and the workpiece temperature is maintained.
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Accused Products
Abstract
The present invention provides a heat transfer assembly that, when coupled to an object, is capable of keeping the object at a uniform elevated temperature while removing large amounts of heat from an external source. The assembly may be contained in a pedestal for use in a UV-cure chamber. The heat transfer assembly includes a heating element to control the wafer temperature and a cooling element to remove incident IR heat from the wafer and pedestal. A heat resistant layer having a calibrated heat resistance is located between the heating and cooling elements and between the wafer and the cooling elements. The heat resistant layer is able to sustain high temperature gradient from the wafer to the coolant so that the coolant does not boil while permitting enough heat to be conducted away from the wafer to maintain the desired set-point temperature.
438 Citations
22 Claims
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1. A pedestal for maintaining a workpiece exposed to an external heat source at a uniform temperature comprising a heat transfer assembly, said heat transfer assembly comprising:
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a) a heating element for controlling the workpiece temperature; b) a cooling element for removing heat generated by the heat source, said cooling element using a coolant having a boiling temperature of less than 200°
C. as a heat-transfer fluid; andc) a heat resistant layer located between the heating and cooling elements;
said layer having a calibrated heat resistance such that coolant in the cooling element does not boil and the workpiece temperature is maintained. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 21)
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12. A heat transfer assembly for maintaining a workpiece exposed to an external heat source at a uniform temperature of at least 200°
- C. comprising;
a) a heating element for controlling the workpiece temperature; b) a cooling element for removing heat generated by the heat source, said cooling element using a coolant having a boiling temperature of less than 200°
C. as a heat-transfer fluid; andc) a heat resistant layer located between the heating and cooling elements;
said layer having a calibrated heat resistance such that coolant in the cooling element does not boil and the workpiece temperature is maintained. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 22)
- C. comprising;
Specification