Abstract:
A ceramic heater for heating the whole of a semiconductor wafer uniformly by supporting it stably without causing it to bend. The ceramic heater having a heating body on the surface of or inside a disk−shaped ceramic base and having through holes for passing lifter pins therethrough in the ceramic base is characterized in that the number of through holes is three or more, and the through holes are formed in an area at a distant from the center of the ceramic base, the distance being over 1/2 of the distance from the center of the ceramic base to the edge.
Abstract:
A ceramic heater for a semiconductor producing and inspecting device capable of increasing a temperature decreasing rate and reducing a throughput time for semiconductor production, comprising a heating element formed on the surface of or inside a ceramic substrate, characterized in that the surface roughness of the ceramic substrate on the opposite side of the heated surface is 20μm or below by Ra.
Abstract:
A ceramic heater having a resistor firmly attached to a ceramic board, wherein the resistor is composed of at least two kinds of noble meta particles, ruthenium dioxide and glass frit.
Abstract:
A hot plate for semiconductor manufacture and testing is provided that prevents the stagnation of air between a silicon wafer and a heating plane separated at a predetermined distance so the wafer can be heated uniformly. The hot plate includes a resistance-heating element formed on or within the surface of a ceramic substrate, the heating plane of which has glossiness of greater than 1.5%.
Abstract:
A ceramic heater for a semiconductor manufacturing/testing apparatus has a resistance heating element excellent in adhesion with its substrate. The ceramic heater including a resistance heating element formed on the surface of its ceramic substrate, is characterized in that the surface of the side of the resistance heating element is corrugated.
Abstract:
A hot plate capable of having the temperature of a heating surface accurately measured by a thermo-viewer due to a low infrared transmittance of up to 10% provided by a ceramic substrate, comprising a conductive layer formed on the surface or inside of the ceramic substrate, characterized in that the ceramic substrate has an infrared wavelength transmittance of 0 or up to 10%.
Abstract:
A ceramic heater includes a resistance-heating element formed on one side of a ceramic substrate, and a workpiece is heated on the other side of the ceramic substrate. The variation in thickness of the substrate is between the average thickness plus 50% and the average thickness minus 50%, and the surface roughness Rmax of the resistance heating element is 0.05-100 microns and within 50% of the average thickness, so that the temperature distribution is uniform over the side of the resistance heating element where a workpiece is placed.