Patent ID: 9632437
Date: 2017-04-25
CPC Classifications: G03F

Claim:
1. A lithography apparatus, comprising: a reticle stage having a reticle that is an extreme ultraviolet (EUV) mask; a plurality of nozzles on at least one surface of the reticle stage and configured to direct shielding gas to flow to a surface of the reticle to form an air curtain, one of the plurality of nozzles and another one of the plurality of nozzles being configured to direct the shielding gas to flow in an orthogonal direction with respect to each other, and in parallel with the surface of the reticle, the plurality of nozzles being configured to move together with the reticle stage, and the shielding gas protecting the surface of the reticle; and a gas supply unit configured to supply the plurality of nozzles with the shielding gas.