Lithographic apparatus and device manufacturing method
First Claim
Patent Images
1. A lithographic projection apparatus comprising:
- a substrate table constructed to hold a substrate;
a projection system configured to project a patterned radiation beam onto a target portion of the substrate; and
a liquid supply system configured to at least partly fill a space between the projection system and the substrate table with an immersion liquid, the liquid supply system comprising an inlet to introduce the immersion liquid to the space and comprising;
a liquid purifier configured to purify the immersion liquid; and
a gas reduction system configured to separate gas from the immersion liquid before introduction into the space and to separate gas from fluid removed from the space, the gas reduction system configured to separate gas from the immersion liquid between the liquid purifier and the inlet.
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Abstract
In a lithographic projection apparatus, a liquid supply system maintains liquid in a space between the projection system and the substrate. The liquid supply system may further include a de-mineralizing unit, a distillation unit, a de-hydrocarbonating unit, a UV radiation source, and/or a filter configured to purify the liquid. A gas content reduction device may be provided to reduce a gas content of the liquid. A chemical may be added to the liquid using an adding device to inhibit lifeform growth and components of the liquid supply system may be made of a material which is non-transparent to visible light such that growth of lifeforms may be reduced.
113 Citations
20 Claims
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1. A lithographic projection apparatus comprising:
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a substrate table constructed to hold a substrate; a projection system configured to project a patterned radiation beam onto a target portion of the substrate; and a liquid supply system configured to at least partly fill a space between the projection system and the substrate table with an immersion liquid, the liquid supply system comprising an inlet to introduce the immersion liquid to the space and comprising; a liquid purifier configured to purify the immersion liquid; and a gas reduction system configured to separate gas from the immersion liquid before introduction into the space and to separate gas from fluid removed from the space, the gas reduction system configured to separate gas from the immersion liquid between the liquid purifier and the inlet. - View Dependent Claims (2, 3, 4, 5)
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6. A lithographic projection apparatus, comprising:
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a substrate table constructed to hold a substrate; a projection system configured to project a patterned radiation beam onto a target portion of the substrate; a liquid supply system configured to at least partly fill a space between the projection system and the substrate table with a liquid, the liquid supply system comprising an inlet to introduce the immersion liquid to the space and comprising; a liquid purifier configured to purify the liquid; and a gas reduction system configured to reduce the oxygen content of the liquid to be supplied to the space and to separate gas from fluid removed from the space, the gas reduction system configured to reduce the oxygen content of the liquid between the liquid purifier and the inlet. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13, 14, 15)
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16. A device manufacturing method, comprising:
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purifying an immersion liquid; separating gas from the purified immersion liquid; at least partly filling a space between a projection system and a movable table with the degassed purified immersion liquid; projecting a patterned radiation beam, through the immersion liquid, onto a target portion of a substrate; and removing fluid from the space; and separating gas or liquid from the removed fluid.
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17. A lithographic projection apparatus comprising:
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a substrate table constructed to hold a substrate; a projection system configured to project a patterned radiation beam onto a target portion of the substrate; a structure comprising a plurality of pores; a liquid handling system configured to at least partly fill a space between the projection system and the substrate table with an immersion liquid, the liquid handling system comprising an outlet passage from the space to remove fluid from the space and pass the fluid through the structure; and a gas separation system, downstream from the structure and in the fluid path of the outlet passage, configured to separate gas or liquid from the fluid removed from the space via the outlet passage after having passed through the structure. - View Dependent Claims (18)
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19. A device manufacturing method, comprising:
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at least partly filling a space between a projection system and a movable table with immersion liquid; projecting a patterned radiation beam, through the immersion liquid, onto a target portion of a substrate; and removing fluid from the space through an outlet passage and passing the fluid through a structure comprising a plurality of pores; and separating gas or liquid from the removed-fluid removed via the outlet passage after having passed through the structure using a gas separation system downstream from the structure and in the fluid path of the outlet passage. - View Dependent Claims (20)
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Specification