Optical system and rear projector
First Claim
Patent Images
1. An optical system that projects projection light from an image generating device, onto a screen, the optical system comprising:
- a lens system on which the projection light from the image generating device is incident; and
an aspherical mirror with negative power as a whole that is disposed on an optical path between the lens system and the screen, wherein a curvature of the aspherical mirror in the radial direction changes positive to negative on a way from a center to a periphery thereof,wherein the curvature of the aspherical mirror decreases from the center to the periphery.
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Abstract
An optical system that projects projection light from an image generating device, onto a screen is provided. The optical system comprises: a lens system on which the projection light from the image generating device is incident; and an aspherical mirror with negative power as a whole that is disposed on an optical path between the lens system and the screen, wherein a curvature of the aspherical mirror in the radial direction changes positive to negative on a way from a center to a periphery thereof.
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Citations
15 Claims
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1. An optical system that projects projection light from an image generating device, onto a screen, the optical system comprising:
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a lens system on which the projection light from the image generating device is incident; and an aspherical mirror with negative power as a whole that is disposed on an optical path between the lens system and the screen, wherein a curvature of the aspherical mirror in the radial direction changes positive to negative on a way from a center to a periphery thereof, wherein the curvature of the aspherical mirror decreases from the center to the periphery. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. An optical system that projects projection light from an image generating device, onto a screen, the optical system comprising:
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a lens system on which the projection light from the image generating device is incident; and an aspherical mirror with negative power as a whole that is disposed on an optical path between the lens system and the screen, wherein a curvature of the aspherical mirror in the radial direction changes positive to negative on a way from a center to a periphery thereof, wherein a lens located at an end of a projection side of the lens system is a meniscus lens that is convex on the projection side. - View Dependent Claims (11, 12)
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13. An optical system that projects projection light from an image generating device, onto a screen, the optical system comprising:
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a lens system on which the projection light from the image generating device is incident; and an aspherical mirror with negative power as a whole that is disposed on an optical path between the lens system and the screen, wherein a curvature of the aspherical mirror in the radial direction changes positive to negative on a way from a center to a periphery thereof, wherein the lens system includes, from a projection side, a front group with negative refractive power, a rear group with positive refractive power, and one of a flat mirror and a prism that bends an optical path between the front group and the rear group. - View Dependent Claims (14, 15)
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Specification