Patent ID: 7576303

Claim:
A wafer holder comprising: a chuck top configured and arranged to mount a wafer; a support member configured and arranged to support the chuck top, the support member being made from a metal or metal-ceramic complexes; and a stand configured and arranged to support the support member, wherein the chuck top, the support member and the stand are separate elements that are stacked together, with a heat insulation structure provided in the chuck top, the support member, or between the chuck top and the support member, and wherein the chuck top has a thermal conductivity K 1 and a Young's modulus Y 1 , the support member has a thermal conductivity K 2 and a Young's modulus Y 2 , and the stand has a thermal conductivity K 3 and a Young's modulus Y 3 , with K 1 >K 2 and K 1 >K 3 , and Y 3 >Y 1 and Y 3 >Y 2 .