| 摘要 |
A lighting device includes: a light source unit which supplies coherent light; a polarized light splitting unit which reflects first polarized light having first oscillation direction and transmits second polarized light having second oscillation direction substantially orthogonal to the first oscillation direction to split the first polarized light from the second polarized light; a reflection unit which reflects light advancing in a direction other than the lighting direction from the polarized light splitting unit; a partial reflection unit disposed between the polarized light splitting unit and the reflection unit to transmit a part of entering light and reflect the other part of the entering light; and a wavelength plate disposed between the polarized light splitting unit and the partial reflection unit no vary polarization condition of entering light. The partial reflection unit and the reflection unit produce optical path difference between light which passes through the partial reflection unit and the polarized light splitting unit to be released in the lighting direction and light which sequentially passes through the partial reflection unit, the reflection unit, the partial reflection unit, and the polarized light splitting unit to be released in the lighting direction.
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