Patent ID: 8059258

Claim:
A liquid immersion lithography apparatus comprising: a projection system having a last member, the projection system projecting an image onto a workpiece to expose the workpiece through a liquid filled in a space between the last member and the workpiece; and a liquid supply device including a supply inlet, the liquid supply device supplying the liquid from the supply inlet to the space between the workpiece and the last member during exposure of the workpiece, wherein the last member includes an optical element and a plate which are connected with each other without a gap between surfaces of the optical element and the plate, a material of the optical element is different from a material of the plate, the material of the optical element is degraded by the liquid more easily than the material of the plate is degraded by the liquid, and the plate is disposed between the optical element and the workpiece so that the plate prevents the liquid from contacting the optical element to prevent degradation of the optical element that may be affected by contact with the liquid.