| 摘要 |
The invention concerns achieving an increase in illumination efficiency of an illumination optical system in a projector using an optical modulation device. A projector may include an optical modulation device for controlling a direction of emission of illumination light applied to a substantially rectangular light application surface, including a plurality of pixels, for each pixel according to image information to thereby emit image light representing an image, an illuminating optical system for emitting the illumination light so that the central axis of the illumination light applied to the light application surface enters the light application surface at a predetermined angle, and a projection optical system for projecting the image light emitted from the optical modulation device. The illuminating optical system may include a light source, and a light-transmitting rod through which the light emitted from the light source passes. At least a part of the light passes while being repeatedly reflected by an inner surface of the light-transmitting rod. The light-transmitting rod has a shape such that a sectional area perpendicular to the central axis of the light-transmitting rod monotonically increases from the incident side to the emitting side.
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