Imaging optical system, projection display device, and imaging apparatus
AssigneeFUJIFILM Corporation
InventorYukiko NAGATOSHI
Life of this patent
Estimating the term…
Abstract
The imaging optical system consists of, in order from the magnification side, a first optical system forming an intermediate image and a second optical system re-forming the intermediate image, and is configured to be telecentric on the reduction side. The imaging optical system satisfies predetermined conditional expressions relating to a ray height on a lens surface closest to the magnification side in the second optical system, a ray height on a lens surface closest to the reduction side in the first optical system, and heights of rays at a position where a principal ray with the maximum angle of view intersects with the optical axis in the second optical system.
Claims10
An imaging optical system consisting of, in order from a magnification side to a reduction side:
- a first optical system that has at least one lens and forms an intermediate image at a position conjugate to a magnification side imaging surface;
- and
- a second optical system that has at least one lens and re-forms the intermediate image on a reduction side imaging surface,
- wherein the imaging optical system is configured to be telecentric on the reduction side, and
- wherein assuming that
- a height of a principal ray with a maximum angle of view on a lens surface closest to the magnification side in the second optical system is hkc2,
- a height of the principal ray with the maximum angle of view on a lens surface closest to the reduction side in the first optical system is hrc1,
- a height of an on-axis marginal ray of the lens surface closest to the magnification side in the second optical system is hkm2, and
- a height of the on-axis marginal ray at a position where the principal ray with the maximum angle of view intersects with an optical axis in the second optical system is hs,
- Conditional Expressions (1) and (2) are satisfied,
- 1.5<hkc2/hrc1 (1)
- hkm2/hs<0.8 (2).
Dependencies are inferred from the claim text.