Illumination optical system and image projection device
AssigneeKonica Minolta Opto, Inc.
InventorYasumasa Sawai
Life of this patent
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Abstract
An illumination optical system has: a light source, a first optical member, a second optical member, and a rod integrator, and illuminates an image display surface of a display element. The light source emits illumination light having a flat beam cross section. The first optical member reduces flatness of the beam cross section. The second optical member condenses or diverges the illumination light. The rod integrator uniformizes spatial energy distribution of the illumination light subjected to optical action of the first and second optical members.
Claims16
An illumination optical system for illuminating an image display surface of a display element, the illumination optical system comprising:
- a light source emitting illumination light having a flat beam cross section;
- a first optical member reducing flatness of the beam cross section;
- a second optical member condensing or diverging the illumination light from the first optical member;
- and
- a rod integrator uniformizing spatial energy distribution of the illumination light subjected to optical action of the first and second optical members.
An image projection device comprising:
- an illumination optical system including:
- a light source emitting illumination light having a flat beam cross section,
- a first optical member reducing flatness of the beam cross section,
- a second optical member condensing or diverging the illumination light from the first optical member, and
- a rod integrator uniformizing spatial energy distribution of the illumination light subjected to optical action of the first and second optical members;
- a display element forming an image by modulating the illumination light from the rod integrator;
- and
- a projection optical system projecting on an enlarged scale the image formed by the display element.
Dependencies are inferred from the claim text.