Projection optical system and projection display device
AssigneeFUJIFILM Corporation
InventorMasaru AMANO
Life of this patent
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Abstract
A projection optical system consists of, in order from the magnification side, a first optical system, which consists of one convex mirror and a plurality of lenses disposed on the reduction side of the convex mirror, and a second optical system. The lens closest to the magnification side in the first optical system is a negative lens. Assuming that a paraxial radius of curvature of the convex mirror is Mr and a focal length of the negative lens closest to the magnification side in the first optical system is fL1, Conditional Expression is satisfied: 0<Mr/fL1<4.5.
Claims14
A projection optical system consisting of, in order from a magnification side to a reduction side:
- a first optical system that consists of one convex mirror and a plurality of lenses disposed on the reduction side of the convex mirror;
- and
- a second optical system that includes a plurality of lenses,
- wherein the second optical system forms an intermediate image at a position conjugate to a reduction side imaging surface, and the first optical system forms a final image, which is conjugate to the intermediate image, on a magnification side imaging surface,
- wherein a lens closest to the magnification side in the first optical system is a negative lens, and
- wherein assuming that a paraxial radius of curvature of the convex mirror is Mr and a focal length of the negative lens closest to the magnification side in the first optical system is fL1, Conditional Expression (1) is satisfied,
- 0<Mr/fL1<4.5 (1).
Dependencies are inferred from the claim text.