Patent ID: 7542208

Claim:
A beam-condensing unit comprising: a first light source that outputs a plurality of first light fluxes arrayed along a first direction; a second light source that outputs a plurality of second light fluxes arrayed along the first direction; and a condenser mirror having first and second optical plates that intersect with each other, wherein the first optical plate includes a plurality of first reflecting portions that are arrayed along the first direction and reflect the plurality of first light fluxes, respectively, and the second optical plate includes a plurality of second reflecting portions that are arrayed along the first direction alternately with the first reflecting portions and reflect the plurality of second light fluxes, respectively; and a third light source that outputs a plurality of third light fluxes arrayed along the first direction, wherein the condenser mirror has a plurality of light passing portions that are arrayed along the first direction and allow the plurality of third light fluxes to pass, respectively, the first reflecting portions, the second reflecting portions, and the light passing portions are repeatedly arrayed along the first direction in a fixed order, the first optical plate has one or more first opening portions arrayed along the first direction alternately with the first reflecting portions, the second optical plate has one or more second opening portions arrayed along the first direction alternately with the second reflecting portions, one or more of the first reflecting portions penetrate through the second opening portions, and one or more of the second reflecting portions penetrate through the first opening portions, and the first and second opening portions include gaps formed between the first and second reflecting portions as the light passing portions.