Patent ID: 7113258
Filing Date: 2006-09-26
Classification: G03F

Abstract:
1. A lithographic projection apparatus comprising: a support structure for supporting a patterning device, the patterning device serving to pattern a beam of radiation according to a desired pattern; a substrate table for holding a substrate, the substrate having a first side and a second side; a projection system for imaging the patterned beam onto a target portion on a first side of the substrate, while the second side of the substrate faces the substrate table; an alignment system for aligning a pattern of the patterning device with an alignment mark provided on the substrate, using alignment radiation; a fluid system constructed and arranged to allow a fluid to be present between the projection system and the substrate; an optical system for providing an image of said alignment mark for use by the alignment system, said optical system being constructed and arranged to direct the aligmnent radiation via the second side of the substrate, and a processor arranged to control said alignment system and to control a fluid supply of the fluid system such that said aligning is performed while said fluid supply supplies fluid between the projection system and the substrate.