Liquid immersion type exposure apparatus
First Claim
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1. A liquid immersion type exposure apparatus, comprising:
- a projection optical system for projecting a pattern of a mask onto a substrate;
a liquid film forming system for forming a liquid film in a predetermined region between said projection optical system and the substrate; and
a sensor for detecting disappearance of at least a portion of the liquid film in said predetermined region.
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Abstract
Disclosed is a liquid immersion type exposure apparatus specifically arranged to maintain a liquid film between an exposure substrate and a terminal end portion of a projection optical system. In one preferred form, the liquid immersion type exposure apparatus includes a projection optical system for projecting a pattern of a mask onto a substrate, a liquid film forming system for forming a liquid film in a predetermined region between the projection optical system and the substrate, and a sensor for detecting disappearance of at least a portion of the liquid film in the predetermined region.
568 Citations
7 Claims
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1. A liquid immersion type exposure apparatus, comprising:
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a projection optical system for projecting a pattern of a mask onto a substrate;
a liquid film forming system for forming a liquid film in a predetermined region between said projection optical system and the substrate; and
a sensor for detecting disappearance of at least a portion of the liquid film in said predetermined region. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification