Patent ID: 7767983

Claim:
An exposure device for forming predetermined patterns onto an object by means of UV light emitted from at least one optical source, said exposure device comprising: an object stage on which the object is to be set; at least one aperture member having a first open window and a second open window for splitting a light beam from the optical source into a first light beam and a second light beam; first and second spatial light modulators for spatially modulating the first and second light beams, respectively; first and second projection optical systems for irradiating the object with the first and second light beams that have been spatially modulated by the first and second spatial light modulators, respectively; at least one first optical sensor for detecting an intensity of the light beam from the optical source, and for outputting a first output report indicating the detected intensity, the first optical sensor being located near the aperture member; one or more second optical sensors for detecting intensities of the first and second light beams that have passed through the first and second projection optical systems, respectively, and for outputting second output reports indicating the detected intensities; and a decision section for diagnosing status of a route between the aperture member and the object, based on the first and second output reports.