Microscope objective lens
AssigneeNikon Corporation
InventorsTaeko Toshi, Kazuhiro Takasago
Life of this patent
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Abstract
Provided is a microscope objective lens that sufficiently corrects on-axis and off-axis chromatic aberrations and that has a long working distance. A microscope objective lens OL includes, in order from an object side, a first lens group G1 with positive refractive power and a second lens group G2 with negative refractive power. The first lens group G1 of the microscope objective lens OL includes a diffractive optical element GD including a diffractive optical surface D, and the diffractive optical element GD is arranged at a position closer to the image than a section where a diameter of a light flux passing through the first lens group G1 is the largest.
Claims25
A microscope objective lens comprising, in order from an object side:
- a first lens group with positive refractive power;
- and
- a second lens group with negative refractive power, wherein
- the first lens group comprises a diffractive optical element including a diffractive optical surface, and
- the diffractive optical element is arranged at a position closer to an image than a position where a diameter of a light flux passing through the first lens group is the largest,
- wherein a condition 0.3<d0/L <0.6 is satisfied, in which a distance on an optical axis from the object to an apex of a lens surface closest to the object of the first lens group is defined d0, and a distance on the optical axis from the object to an apex of a lens surface closest to an image is defined as L.
A microscope objective lens comprising, in order from an object side:
- a first lens group with positive refractive power, and
- a second lens group with negative refractive power, wherein
- the first lens group comprises a diffractive optical element including a diffractive optical surface, and
- the diffractive optical element is arranged at a position closer to an image than a position where a diameter of a light flux passing through the first lens group is the largest,
- wherein
- a condition φDOE/φmax <0.5 is satisfied, in which a maximum diameter of the light flux passing through the first lens group is defined as φmax, and a maximum diameter of the light flux passing through the diffractive optical surface is defined as φDOE.
Dependencies are inferred from the claim text.