发明授权
US07154585B2 Projection optical system, exposure apparatus, and device production method 有权
投影光学系统,曝光装置和装置制作方法

Projection optical system, exposure apparatus, and device production method
摘要:
Provided is a projection optical system for forming an image of a pattern of a first object (R) on a second object (W). The projection optical system is made of an optical material having a refractive index of not more than 1.6 and is substantially telecentric both on the first object side and on the second object side. The projection optical system satisfies the condition of (λ×L)/(NA×Y02)
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