Patent ID: 6741394
Filing Date: 2004-05-25
Classification: B41M,G02B,G03F,G03G

Abstract:
A wavefront dividing type optical integrator comprising:a plurality of micro optical elements arranged two-dimensionally, for forming a plurality of light sources by dividing a wavefront of an incident beam; wherein each of said micro optical elements has a rectangular entrance surface and a rectangular exit surface, and wherein at least one of the following conditions is satisfied: (d1/2)(D1/2)/(&lgr;Â·f)&gE;3.05 (d2/2)(D2/2)/(&lgr;Â·f)&gE;3.05 where f is a focal length of each of said micro optical elements, d1 is a length of one side of the entrance surface of each of said micro optical elements, d2 is a length of the other side of the entrance surface of each of said micro optical elements, D1 is a length of the side of an exit surface in each of said micro optical elements corresponding to said one side of the entrance surface, D2 is a length of the side of the exit surface in each of said micro optical elements corresponding to said other side of the entrance surface, and &lgr; is a wavelength of said incident beam.