| 摘要 |
PURPOSE:To improve the efficiency of effectively utilizing light of a light source by reflecting, plural times, either of the transmitted light or reflected light of the linearly polarized light beams which are separated from the inconsistent polarized light from the light source and intersect orthogonally with each other by >=2 pieces of total reflecting mirrors and synthesizing the same in such a manner that the polarization directions of the two light beams are equalized. CONSTITUTION:The transmitted light 7 provides the linearly polarized light of P-polarization (polarization direction 9) and the reflected light 8 provides the linearly polarized light of S-polarization (polarization direction 10) when incident light 3 obtd. by radiating the inconsistent polarized light from the light source 1 and passing the same through a condenser lens 2 to form parallel luminous fluxes is entered to a polarization beam splitter 4. The reflected light 8 is changed in the polarization direction respectively like polarization directions 11, 12 by reflecting on the total reflecting mirrors 5 and 6. The reflected light 15 reflected by the total reflecting mirror 6 is in the same progressing direction as the progressing direction of the transmitted light 7 and the polarization directions 13 and 14 are equal. The efficiency of utilizing the light at the time of converting the inconsistent polarized light from the light source 1 to the linearly polarized light is, therefore, enhanced by as much as the synthesized reflected light 15 by synthesizing the reflected light 15 and the transmitted light 7.
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