To obtain an illumination optical system capable of easily performing focus adjustment of a projection image by a projection optical system on a screen surface by smoothly blurring the blur of the projection image even if the projection image is projected in such a state that it is deviated from the screen surface.
The illumination optical system that illuminates a surface to be irradiated includes: a light source means; a luminous flux separating means that separates light from the light source means into a plurality of luminous fluxes and forms a plurality of light source images; a condensing means that superimposes the plurality of luminous fluxes on the surface to be irradiated; and a light source image moving means that displaces imaging positions of the plurality of light source images formed on the pupil of the projection optical system for projecting an image display element provided on the surface to be irradiated onto a predetermined surface.
JP2007094095A | 2007-04-12 | |||
JP2007140111A | 2007-06-07 | |||
JP2010066369A | 2010-03-25 |
WO2008081564A1 | 2008-07-10 |
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