WAVELENGTH- SELECTIVE POLARIZATION CONVERSION ELEMENT, PROJECTION DISPLAYING OPTICAL SYSTEM AND IMAGE PROJECTION APPARATUS

摘要

It has a polarization conversion function, the reduction in the number of optical components in the optical system, and provides a wavelength-selective polarization conversion element is simplified in the structure designed. A wavelength selective polarization conversion element 5 converts the mupyeon light, including light and light of the third wavelength range (R) of the light, the second wavelength band (G) of the first wavelength band (B) to the polarized light. The polarization conversion element (5) comprises a polarization direction of light from the at least a first light separator having the characteristic that the transmittance is changed according to the wavelength region for the light having a polarization direction (32), (34), and the optical membrane 1 It has the phase difference plate 33 to convert between the polarization direction and the second polarization direction. The polarization conversion element is the first to light in the two wavelength ranges of the three wavelength ranges the first and second polarized light emitted as a polarized light having a polarization direction of one of the direction, and the light in the other wavelength region polarized light of the other It is emitted as light having a polarization direction.