Projection optical system and projection display device using the same
First Claim
1. A projection optical system having a magnification side and a reduction side for forming a magnified image on a magnification side image surface that is conjugate with a reduction side image surface, said projection optical system comprising, arranged in order from the reduction side:
- a first imaging system including a plurality of lens elements and lens components; and
a second imaging system including a mirror having a concave, aspheric reflecting surface;
wherein an intermediate image is formed between said first imaging system and said second imaging system.
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Accused Products
Abstract
A projection optical system having a magnification side and a reduction side for forming a magnified image on a magnification side image surface conjugate with a reduction side conjugate image surface includes, arranged in order from the reduction side, a first imaging system including a plurality of lens elements and lens components and a second imaging system including a mirror having a concave, aspheric reflecting surface. An intermediate image is formed between the first imaging system and the second imaging system. The projection optical system satisfies specified conditions related to the travel of principal rays through the projection optical system and related to the Abbe number of a lens element having positive refractive power of the first imaging system. A projection display device includes the projection optical system and may include a light valve for modulating a light beam for projection on a screen.
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Citations
20 Claims
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1. A projection optical system having a magnification side and a reduction side for forming a magnified image on a magnification side image surface that is conjugate with a reduction side image surface, said projection optical system comprising, arranged in order from the reduction side:
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a first imaging system including a plurality of lens elements and lens components; and
a second imaging system including a mirror having a concave, aspheric reflecting surface;
whereinan intermediate image is formed between said first imaging system and said second imaging system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification