WIDE-ANGLE PROJECTION OPTICAL SYSTEM
First Claim
1. A wide-angle projection optical system, from an object side to an image side, said wide-angle projection optical system comprising:
- a first lens set having positive power, and configured to provide optical characteristics to match with a light beam coming from said object side;
an aperture stop;
a second lens set having positive power, arranged behind said aperture stop, and configured to converge said light beam;
a third lens set with negative power, and configured to diverge said light to enlarge a full field angle; and
a negative power reflecting mirror closer to said image side than said first lens set, said second lens set and said third lens set, and configured to further enlarge said full field angle and correct image distortion,wherein said first lens set, said second lens set, said third lens set and said reflecting mirror have a common optical axis, and said optical axis is shifted with respect to a center of a micro display.
1 Assignment
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Accused Products
Abstract
A wide-angle projection optical system includes a first lens set with positive power, an aperture stop, a second lens set with positive power, a third lens set with negative power, and a negative power reflecting mirror. The first lens set provides optical characteristics to match with a light beam coming from the object side. The second lens set is arranged behind the aperture stop to converge the light beam. The third lens set is configured to diverge the light to enlarge a full field angle. The negative power reflecting mirror is configured to further enlarge the full field angle and correct image distortion. The first lens set, the second lens set, the third lens set and the reflecting mirror have a common optical axis. The optical axis is shifted with respect to a center of a micro display.
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Citations
12 Claims
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1. A wide-angle projection optical system, from an object side to an image side, said wide-angle projection optical system comprising:
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a first lens set having positive power, and configured to provide optical characteristics to match with a light beam coming from said object side; an aperture stop; a second lens set having positive power, arranged behind said aperture stop, and configured to converge said light beam; a third lens set with negative power, and configured to diverge said light to enlarge a full field angle; and a negative power reflecting mirror closer to said image side than said first lens set, said second lens set and said third lens set, and configured to further enlarge said full field angle and correct image distortion, wherein said first lens set, said second lens set, said third lens set and said reflecting mirror have a common optical axis, and said optical axis is shifted with respect to a center of a micro display. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A wide-angle projection optical system, from an object side to an image side, said wide-angle projection optical system comprising:
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a first lens set configured to provide optical characteristics to match with a light beam coming from said object side; an aperture stop; a second lens set arranged behind said aperture stop, and configured to converge said light beam; a third lens set having negative power, and configured to diverge said light to enlarge a full field angle, wherein said third lens set comprises at least three convex-concave lenses, and both surfaces of each of at least two lenses of said third lens set are aspheric; and a negative power reflecting mirror arranged in the vicinity of said image side, and configured to further enlarge said full field angle and correct image distortion. - View Dependent Claims (11, 12)
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Specification