Patent ID: 7251014
Filing Date: 2007-07-31
Classification: G03B,G03F

Abstract:
1. An exposing method of applying ultraviolet light emitted from a light source to an object to be exposed through a first isolated chamber including a first optical surface, a second isolated chamber including a second optical surface, and a third isolated chamber including a third optical surface to thereby expose the object to be exposed by the light, comprising: a first cleaning step of supplying a cleaning gas to said first isolated chamber to thereby clean the first optical surface; a second cleaning step of supplying a cleaning gas to said second isolated chamber to thereby clean the second optical surface; and a third cleaning step of supplying a cleaning gas to said third isolated chamber to thereby clean the third optical surface, wherein said first isolated chamber is disposed nearer said light source than said second isolated chamber on an optical axis, and said second isolated chamber is disposed nearer said light source than said third isolated chamber on the optical axis, and wherein the start of said first cleaning step is later than the start of said second cleaning step and the start of said second cleaning step is later than the start of said third cleaning step.