发明授权
US07123427B2 Objective, particularly a projection objective for use in semiconductor lithography 失效
目的,特别是用于半导体光刻的投影目标

Objective, particularly a projection objective for use in semiconductor lithography
摘要:
The invention relates to an objective, particularly a projection objective for use in semiconductor lithography, comprising optical elements such as lenses (16) and mirrors (11a). According to the invention, at least a portion of the optical elements (16, 11a) is provided with a reflective surface outside of the optically active area serving as the reference surface (12) for a the optical element inside the objective (8).
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