PROJECTION OPTICAL SYSTEM, MAGNIFICATION PROJECTION OPTICAL SYSTEM, MAGNIFICATION PROJECTION APPARATUS, AND IMAGE PROJECTION APPARATUS
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Abstract
A projection optical system for use in an image projection apparatus illuminating a lightbulb forming an image in accordance with a modulating signal with illumination light from a light source is disclosed. 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 lightbulb. 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 lightbulb is formed as an intermediate image in the optical path, and the intermediate image is magnified and projected.
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Citations
17 Claims
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1-10. -10. (canceled)
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11. A magnification projection optical system that guides a light beam from an image display panel to a screen in an upstream-downstream direction, projects the light beam from a direction inclined to a normal of the screen, and forms on the screen a magnified version of an image displayed on the image display panel, the magnification projection optical system comprising:
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a reflection optical system; and a transmission optical system, wherein the reflection optical system includes a plurality of reflecting surfaces having power and includes at least one rotationally asymmetric reflecting surface; and the transmission optical system includes a transmitting surface having refractive power and includes at least one aspheric surface. - View Dependent Claims (12, 13, 14, 15, 16)
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17-76. -76. (canceled)
Specification