PROJECTION OPTICAL SYSTEM AND IMAGE PROJECTING APPARATUS
First Claim
1. A projection optical system comprisinga first optical system configured to form a second image conjugate to a first image anda second optical system configured to comprise a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface,whereinthe first optical system comprises a stop and at least one optical element with a positive refractive power and at least one optical element with a negative refractive power which are provided between the stop and the second image, andan optical element with a strongest positive refractive power in the at least one optical element with a positive refractive power is provided between the stop and an optical element with a strongest negative refractive power in the at least one optical element with a negative refractive power.
1 Assignment
0 Petitions
Accused Products
Abstract
A projection optical system including a first optical system configured to form a second image conjugate to a first image and a second optical system configured to include a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface is provided, wherein the first optical system includes a stop and at least one optical element with a positive refractive power and at least one optical element with a negative refractive power which are provided between the stop and the second image, and an optical element with a strongest positive refractive power in the at least one optical element with a positive refractive power is provided between the stop and an optical element with a strongest negative refractive power in the at least one optical element with a negative refractive power.
45 Citations
20 Claims
-
1. A projection optical system comprising
a first optical system configured to form a second image conjugate to a first image and a second optical system configured to comprise a reflective optical element which reflects light from the second image and to project a third image conjugate to the second image onto a projection surface, wherein the first optical system comprises a stop and at least one optical element with a positive refractive power and at least one optical element with a negative refractive power which are provided between the stop and the second image, and an optical element with a strongest positive refractive power in the at least one optical element with a positive refractive power is provided between the stop and an optical element with a strongest negative refractive power in the at least one optical element with a negative refractive power.
-
2. A projection optical system in which plural light beams emitted from an image forming element displaying image information on a conjugate plane A are allowed to be obliquely incident on a conjugate plane B so as to form an enlarged image of an image formed by the image forming element on the conjugate plane B, wherein
the projection optical system comprises, at least, a first optical system, a second optical system, an intermediate image of the image forming element between the first optical system and the second optical system on which the plural light beams are generally converged, an optical system having a refractive power in the first optical system being composed of only a lens system transmitting the light beams, the intermediate image being formed by only a refractive power of the first optical system, the second optical system being a reflective optical system comprising a reflection mirror having a positive refractive power which reflects the light beams and is directly behind the intermediate image, and the first optical system being composed of lens groups having positive, positive, and negative refractive powers in sequence from the side of conjugate plane A.
-
3. A projection optical system in which plural light beams emitted from an image forming element displaying image information on a conjugate plane A are allowed to be obliquely incident on a conjugate plane B so as to form an enlarged image of an image formed by the image forming element on the conjugate plane B, wherein
the projection optical system comprises, at least, a first optical system, a second optical system, an intermediate image of the image forming element between the first optical system and the second optical system on which the plural light beams are generally converged, an optical system having a refractive power in the first optical system being composed of a lens system transmitting the light beams and a reflection mirror being rotationally symmetric with respect to an optical axis of the first optical system and having a negative refractive power, the intermediate image being formed by only a refractive power of the first optical system, the second optical system being a reflective optical system comprising a reflection mirror having a positive refractive power which reflects the light beams and is directly behind the intermediate image, and the lens system transmitting the light beams in the first optical system being composed of lens groups having positive, positive, and negative refractive powers in sequence from the side of conjugate plane A.
Specification