Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus

摘要

In a projection optical system for use in an image projection apparatus illuminating an image display panel forming an image in accordance with a modulating signal with illumination light from a light source, the projection optical system includes first and second optical systems arranged along an optical path defining an upstream-downstream direction in the order described from upstream to downstream on the downstream side of the image display panel. The first optical system includes at least one dioptric system and has positive power. The second optical system includes at least one reflecting surface having power and has positive power. The image formed by the image display panel is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.

主权项

1. A projection optical system for use in an image projection apparatus projecting an image of an object and forming a final image on a plane, the projection optical system comprising:
first and second optical systems arranged so that the first optical system is closer to the object than is the second optical system; wherein the first optical system includes at least one dioptric system and has positive power, the second optical system includes at least one reflecting surface having positive power, the image of the object is formed as an intermediate image in an optical path of the first and second optical systems, and the intermediate image is magnified and projected, and the second optical system is configured so that an angle of incidence to a projection surface on the plane is greater at a position farthest from the object than at a position closest to the object on the final image.