Illuminating device and projection type video display

摘要

An illuminating device 1 includes a discharge lamp 11, a condenser lens 12, an integrator lens 13, a polarization conversion system 14, an electromagnetic wave shielding plate 15, and an electromagnetic wave shielding wall 16. A light given out from each lens in the light-incident-side fly's eye lens 13a becomes two light fluxes via respective polarizing beam splitters 14a and the two light fluxes pass through two lenses in the light-exit-side fly's eye lens 13b. The electromagnetic shielding plate 15 has an aperture on an optical axis of each lens in the light-exit-side fly's eye lens 13b. The electromagnetic wave shielding plate 15 is grounded through the electromagnetic wave shielding wall 16.