Patent ID: 9041901
Filing Date: 2015-05-26
Classification: G03F

Abstract:
1. A lithographic projection apparatus comprising: a movable substrate table by which a substrate is held; a projection system via which a patterned beam is projected onto the substrate held by the movable substrate table to expose the substrate through liquid; a liquid supply system including a supply flow path, which supplies the liquid via the supply flow path during the exposure, the liquid supply system including a device by which the supply flow path is connected with a vacuum system via a first flow path attached to the supply flow path; a liquid recovery system including a recovery flow path, which recovers the supplied liquid; and a controller configured to control the device to connect the supply flow path to the vacuum system via the first flow path to remove the liquid from at least a part of the flow path while the liquid recovery system is not coupled to the supply flow path, wherein the first flow path is not part of the recovery flow path, the recovery of the supplied liquid by the liquid recovery system is executed in parallel with the supply of the liquid by the liquid supply system such that a liquid immersion area is formed at a local area of an upper surface of the substrate during the exposure, and the local area is smaller than an area of the upper surface of the substrate.