PROJECTION OPTICAL SYSTEM AND IMAGE PROJECTION DEVICE
First Claim
1. A projection optical system projecting images on a surface to be projected on, the projection optical system comprising:
- a first optical system including at least one refraction optical system and having positive power as a whole;
a folding mirror; and
a second optical system including at least one reflection surface having power and having positive power as a whole;
wherein the folding mirror folds a light path from the first optical system to the second optical system, in a plane including an optical axis of the first optical system and a normal line of the surface to be projected on, and the following conditional expressions (1) through (3) are satisfied
0.43≦
d1;
(1)
0.43≦
d2; and
(2)
0.7≦
d2/d1≦
2.0,
(3)further d1 is expressed in the following equation (1)
1 Assignment
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Accused Products
Abstract
A disclosed projection optical system projects images on a surface to be projected on. The projection optical system includes a first optical system including at least one refraction optical system and having positive power as a whole, a folding mirror, and a second optical system including at least one reflection surface having power and having positive power as a whole. Further the folding mirror folds a light path from the first optical system to the second optical system, and in a plane including an optical axis of the first optical system and a normal line of the surface to be projected on, the following conditional expressions (1) through (3) are satisfied (1) 0.43≦d1, (2) 0.43≦d2, and (3) 0.7≦d2/d1≦2.0.
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Citations
9 Claims
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1. A projection optical system projecting images on a surface to be projected on, the projection optical system comprising:
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a first optical system including at least one refraction optical system and having positive power as a whole; a folding mirror; and a second optical system including at least one reflection surface having power and having positive power as a whole; wherein the folding mirror folds a light path from the first optical system to the second optical system, in a plane including an optical axis of the first optical system and a normal line of the surface to be projected on, and the following conditional expressions (1) through (3) are satisfied
0.43≦
d1;
(1)
0.43≦
d2; and
(2)
0.7≦
d2/d1≦
2.0,
(3)further d1 is expressed in the following equation (1) - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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Specification