Patent ID: 8792081

Claim:
An exposure apparatus for illuminating an irradiated plane with a plurality of pulse lights and exposing an object arranged on an object plane with the plurality of pulse lights from the irradiated plane, the exposure apparatus comprising: an illumination optical system including: a first optical device including a plurality of first optical elements arranged on a first plane upstream of the irradiated plane in an optical path of the pulse lights; a first plurality of optical components disposed to distribute on a pupil plane the pulse lights travelling via the first optical device; and a second plurality of optical components disposed to illuminate the irradiated plane with the pulse lights from the pupil plane; a second optical device including a plurality of second optical elements that are arranged on the irradiated plane or a plane near the irradiated plane; a projection optical system that is arranged between the irradiated plane and the object plane and guides the pulse lights travelling via the second optical device to the object; and an illumination controller which controls a conversion state of the first optical device whenever a predetermined number of pulse lights are emitted.