发明授权
US08432532B2 Projection optical system with rarefaction compensation 失效
投影光学系统具有稀疏补偿

Projection optical system with rarefaction compensation
摘要:
The present invention provides a projection optical system for projecting a pattern of an object plane onto an image plane, including a first lens whose refractive index irreversibly increases by ultraviolet irradiation, and a second lens whose refractive index irreversibly decreases by the ultraviolet irradiation.
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