Lithographic apparatus and device manufacturing method
A lithographic projection apparatus in which the projection system comprises a plurality of optical elements or sensors mounted on a frame. The frame is made of a glass ceramic material with a coefficient of thermal expansion of less than or approximately equal to 0.1 x 10 K thereby avoiding the nee...
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Format: | Patent |
Sprache: | eng ; fre ; ger |
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Zusammenfassung: | A lithographic projection apparatus in which the projection system comprises a plurality of optical elements or sensors mounted on a frame. The frame is made of a glass ceramic material with a coefficient of thermal expansion of less than or approximately equal to 0.1 x 10 K thereby avoiding the need for expensive cooling systems and/or predictive temperature compensation. |
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