Microscope optical system, microscope device, and image formation lens
AssigneeNikon Corporation
InventorsYuta Kusui, Kazuhiro Takasago
Life of this patent
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Abstract
This microscope optical system comprises an objective lens that collimates light from an object, and an image formation lens (IL) that forms an image of light from the objective lens. The image formation lens (IL) comprises a first lens group (G1) having a cemented lens (CL11), a second lens group (G2) having positive refractive power, and a third lens group (G3) having negative refractive power, which are arranged in order from the object side, and satisfies the following conditional expression. 0.1<Φen/f<0.2 where Φen is the pupil diameter of the objective lens, and f is the focal length of the image formation lens (IL).
Claims9
A microscope optical system comprising:
- an objective lens that converts light from an object into parallel light;
- and
- an image formation lens that forms an image from the light from the objective lens, wherein
- the image formation lens comprises, in order from an object side, a first lens group including a cemented lens, a second lens group having positive refractive power, and a third lens group having negative refractive power, and
- wherein a conditional expression as follows is satisfied:
- 0.1<Φen/f<0.2.
- where Φen represents a pupil diameter of the objective lens, and
- f represents a focal length of the image formation lens,
- wherein a conditional expression as follows is satisfied:
- 65 [mm]<(Φen×Φ1max)/Φim<120 [mm],
- where Φ1max represents an effective diameter of a lens having a largest effective diameter in the first lens group, and
- Φim represents a diameter of an image circle in which the light from the image formation lens forms the image.
An image formation lens for a microscope, the image formation lens forming an image from light from an objective lens, the image formation lens comprising:
- in order from an object side, a first lens group including a cemented lens;
- a second lens group having positive refractive power;
- and a third lens group having negative refractive power, wherein
- a conditional expression as follows is satisfied:
- 0.1<Φen/f<0.2,
- where Φen represents a pupil diameter of the objective lens, and
- f represents a focal length of the image formation lens, wherein a conditional expression as follows satisfied:
- 65 [mm]<(Φen×Φ1max)/Φim<120 [mm],
- where Φ1max represents an effective diameter of a lens having a largest effective diameter in the first lens group, and
- Φim represents a diameter of an image circle in which the light from the image formation lens forms the image.
Dependencies are inferred from the claim text.