| 摘要 |
Exemplary embodiments of the present invention provide an illumination optical device including a light source unit having an arc tube, an ellipsoidal reflector, and a collimator lens, a first lens array to split the luminous flux output from the light source unit into plural partial luminous fluxes, and a superposing lens to superpose the respective partial luminous fluxes split by the first lens array on an image forming region of a liquid crystal panel, and to illuminate the liquid crystal panel in which microlenses are arranged on an incident side of the rectangular image forming region so as to correspond to pixels. By such a constitution, an illumination optical device capable of enhancing image quality and addressing and/or achieving miniaturization and a projector including the device can be provided.
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