Patent ID: 7561249
Filing Date: 2009-07-14
Classification: G03B,G03F

Abstract:
1. An exposure apparatus for exposing a substrate to light via a reticle, said apparatus comprising: a projection optical system configured to project a pattern of the reticle onto the substrate; a stage configured to hold the substrate; a light transmitting member interposed between said stage and an end face of said projection optical system; a first fluid filling system configured to fill, with a first fluid, a first space between said light transmitting member and the end face of said projection optical system, wherein the first fluid is an inorganic fluid having a refractive index higher than a refractive index of pure water; a second fluid filling system configured to fill, with a second fluid, a second space between said light transmitting member and the substrate, wherein the second fluid is an organic fluid having a refractive index higher than a refractive index of pure water; a sensor configured to measure a position of said light-transmitting member; and a controller configured to control the position of said light-transmitting member based on an output signal from said sensor.