Projection optical system, magnification projection optical system, magnification projection apparatus, and image projection apparatus
First Claim
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, andthe 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.
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Abstract
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.
19 Citations
33 Claims
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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:
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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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. 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:
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first and second optical systems arranged so that the first optical system is closer to the object than 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 optical path from the reflecting surface having the positive power to the final image is longer at a position thereof farthest from the object than at a position thereof closest to the object. - View Dependent Claims (11, 12, 14, 15, 16, 17)
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13. The projection optical system as claimed 10, wherein the first optical system is configured to form the intermediate image with a distortion inverse to a possible trapezoidal distortion of the final image.
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18. 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:
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first and second optical systems arranged so that the first optical system is closer to the object than 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 first optical system is configured to form the intermediate image with a distortion inverse to a possible trapezoidal distortion of the final image. - View Dependent Claims (19, 20)
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21. An image projection apparatus configured to project an image of an object and form a final image on a plane, the image projection apparatus comprising:
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an image forming part configured to be illuminated with illumination light and to form the image of the object; first and second optical systems arranged so that the first optical system is closer to the image forming part 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.
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22. An image projection apparatus configured to project an image of an object and form a final image on a plane, the image projection apparatus comprising:
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an image forming part configured to be illuminated with illumination light and to form the image of the object; first and second optical systems arranged so that the first optical system is closer to the image forming part 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 optical path from the reflecting surface having the positive power to the final image is longer at a position thereof farthest from the object than at a position thereof closest to the object.
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23. An image projection apparatus configured to project an image of an object and form a final image on a plane, the image projection apparatus comprising:
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an image forming part configured to be illuminated with illumination light and to form the image of the object; first and second optical systems arranged so that the first optical system is closer to the image forming part 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 first optical system is configured to form the intermediate image with a distortion inverse to a possible trapezoidal distortion of the final image.
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24. A projection optical system, the projection optical system comprising:
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first and second optical systems arranged so that the first optical system is closer to an object than 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, an 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 first optical system is configured to form the intermediate image to compensate for distortion of a final image. - View Dependent Claims (25)
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26. An image projection apparatus configured to project an image of an object, the image projection apparatus comprising:
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an image forming part configured to be illuminated with illumination light and to form a picture of the object; first and second optical systems arranged so that the first optical system is closer to the image forming part than 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 first optical system is configured to form the intermediate image to compensate for distortion of a final image. - View Dependent Claims (27)
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28. A projection optical system, the projection optical system comprising:
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first and second optical systems arranged so that the first optical system is closer to an object than 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, an image of the object is formed as a distorted intermediate image in an optical path of the first and second optical systems, and the distorted intermediate image is magnified and projected on a plane by the second optical system as a final image without substantial distortion. - View Dependent Claims (29, 30)
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31. An image projection apparatus configured to project an image of an object, the image projection apparatus comprising:
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an image forming part configured to be illuminated with illumination light and to form a picture of the object; first and second optical systems arranged so that the first optical system is closer to the image forming part than 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 a distorted intermediate image in an optical path of the first and second optical systems, and the distorted intermediate image is magnified and projected on a plane by the second optical system as a final image without substantial distortion. - View Dependent Claims (32, 33)
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Specification