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|1. (WO2018105021) ILLUMINATION OPTICAL SYSTEM AND PROJECTION VIDEO DISPLAY DEVICE|
|Title:||ILLUMINATION OPTICAL SYSTEM AND PROJECTION VIDEO DISPLAY DEVICE|
In an illumination optical system in which a DMD panel is irradiated at a prescribed angle, the present invention causes a beam emitted from a light source to be focused onto a single spot on the DMD panel as a beam in a fixed angle space with as little aberration as possible. A condenser lens (46) and a prism (47) are arranged in this order between an integrator (45) and a DMD panel (48), and the condenser lens and the prism are constituted so that the main beam in an illumination flux is incident on the DMD panel at a prescribed angle relative to a line normal to the DMD panel. The prism is constituted so that the main beam incident onto the incidence surface and the main beam emitted from the emission surface enter into or exits from a location opposite the prism apex with respect to a line normal to the incidence surface or a line normal to the emission surface, and the emission surface is arranged substantially parallel to the irradiation surface of the DMD panel. The condenser lens (46) is constituted so that main beams are substantially parallel to each other after being emitted, and the condenser lens rotates in the same direction as the incidence surface of the prism (47) and is axially displaced.