Objective, particularly a projection objective for use in...

Optical: systems and elements – Lens – With support

Reexamination Certificate

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C359S872000

Reexamination Certificate

active

07123427

ABSTRACT:
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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