| 摘要 |
PURPOSE:To obtain projection luminous flux having a necessary intensity distribution by splitting incident luminous flux in its oscillation surface, and then superposing split pieces of luminous flux spatially. CONSTITUTION:When linear or circular polarized incident luminous flux 9 is incident, for example, only the S-polarized component is reflected upward vertically through the operation of a polarization beam splitter 1 and the reflected luminous flux 10 is converted into circular polarized light when passing through a quarter-wavelength plate 3 and incident on a right-angled prism 4. The incident luminous flux is directed downward vertically in the right-angled prism 4. The circular polarized luminous flux directed downward vertically is converted by the quarter-wavelength plate 3 into linear polarized light, which is converged by a cylindrical lens 8 and projected linearly on a surface 12. Horizontal luminous flux passed through a cemented surface 2 as to the incident luminous flux 9 passes through a quarter-wavelength plate 5 and a right-angled prism 7 with a ridge line 6, and then the quarter-wavelength plate 5 again, and is all reflected downward vertically by the cemented surface 2 and converged linearly on the surface 12 by the cylindrical lens 8. |
