Patent ID: 8118591

Claim:
A heat shield plate assembly for a substrate annealing apparatus, wherein the heat shield plate assembly comprises: (a) a horizontally supported flat-plate-like substrate; (b) a heater positioned above the substrate to heat an upper surface of the substrate with radiation heat; and (c) a heat shield plate horizontally movable between a shielding position where the substrate is shielded from the heater and an open position out of the shielding position, wherein the heat shield plate comprises a structural member made of a low thermal expansion material that has a thermal expansion coefficient of about 3×10 −6 /° C. to 4×10 −6 /° C. at 800° K, and a heat insulating member that covers an upper surface of the structural member and keeps the upper surface of the structural member at an allowable temperature or below thereby preventing burnout.