Imaging optical system, optical apparatus and image projection apparatus
First Claim
1. An imaging optical system that images an image on one conjugate surface of an enlargement side conjugate surface and a reduction side conjugate surface onto the other conjugate surface, the imaging optical system comprising:
- in order from the reduction side conjugate surface to the enlargement side conjugate surface,a refractive optical system; and
a reflective optical system,wherein the refractive optical system forms an intermediate real image at an intermediate imaging position inside the refractive optical system,wherein the reflective optical system includes a convex mirror disposed closest to the enlargement side conjugate surface, andwherein the following conditional expression is satisfied;
0.01≦
|fL/fM|≦
0.50where fL is a focal length of the refractive optical system, and fM is a focal length of the reflective optical system.
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Abstract
An imaging optical system, which images an image on one conjugate surface of an enlargement side conjugate surface and a reduction side conjugate surface onto the other conjugate surface, includes, in order from the reduction side conjugate surface to the enlargement side conjugate surface, a refractive optical system and a reflective optical system. The refractive optical system forms an intermediate real image at an intermediate imaging position inside the refractive optical system. The reflective optical system includes a convex mirror disposed closest to the enlargement side conjugate surface. The predetermined conditional expression is satisfied.
16 Citations
11 Claims
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1. An imaging optical system that images an image on one conjugate surface of an enlargement side conjugate surface and a reduction side conjugate surface onto the other conjugate surface, the imaging optical system comprising:
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in order from the reduction side conjugate surface to the enlargement side conjugate surface, a refractive optical system; and a reflective optical system, wherein the refractive optical system forms an intermediate real image at an intermediate imaging position inside the refractive optical system, wherein the reflective optical system includes a convex mirror disposed closest to the enlargement side conjugate surface, and wherein the following conditional expression is satisfied;
0.01≦
|fL/fM|≦
0.50where fL is a focal length of the refractive optical system, and fM is a focal length of the reflective optical system. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An optical apparatus comprising:
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an imaging optical system that images an image on one conjugate surface of an enlargement side conjugate surface and a reduction side conjugate surface onto the other conjugate surface, wherein the imaging optical system includes, in order from the reduction side conjugate surface to the enlargement side conjugate surface, a refractive optical system and a reflective optical system, wherein the refractive optical system forms an intermediate real image at an intermediate imaging position inside the refractive optical system, wherein the reflective optical system includes a convex mirror disposed closest to the enlargement side conjugate surface, and wherein the following conditional expression is satisfied;
0.01≦
|fL/fM|≦
0.50where fL is a focal length of the refractive optical system, and fM is a focal length of the reflective optical system.
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10. An image projection apparatus comprising:
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a light modulation element that modulates light; and an imaging optical system that projects light from the light modulation element onto a projection surface, wherein the imaging optical system images an image on one conjugate surface of an enlargement side conjugate surface and a reduction side conjugate surface onto the other conjugate surface, wherein the imaging optical system includes, in order from the reduction side conjugate surface to the enlargement side conjugate surface, a refractive optical system and a reflective optical system, wherein the refractive optical system forms an intermediate real image at an intermediate imaging position inside the refractive optical system, wherein the reflective optical system includes a convex mirror disposed closest to the enlargement side conjugate surface, and wherein the following conditional expression is satisfied;
0.01≦
|fL/fM|≦
0.50where fL is a focal length of the refractive optical system, and fM is a focal length of the reflective optical system. - View Dependent Claims (11)
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Specification