Objective for a confocal microscope
AssigneeOlympus Corporation
InventorKenichiro Abe
Life of this patent
Estimating the term…
Abstract
An objective includes: a first lens group that includes a meniscus lens component that is the closest to an image among lens components of the first lens group, the meniscus lens component having a convex surface facing an object; and a second lens group that is closer to the image than the first lens group is, and the objective satisfies the following conditional expressions: 0≤|Δz1|/DOFe≤1.5 (1) 0≤|Δz2|/DOFe≤2 (2) where Δz1 indicates a difference between a h-line minimization position and an e-line minimization position; Δz2, a difference between a position on then optical axis at which an RMS wavefront aberration in light having a wavelength of 800 nm is minimized and the e-line minimization position; DOFe, a depth of focus for the e line.
Claims20
An objective comprising:
- a first lens group that includes a meniscus lens component that is closest to an image among lens components of the first lens group, the meniscus lens component having a convex surface facing an object;
- and
- a second lens group that is closer to the image than the first lens group is, wherein
- the objective satisfies the following conditional expressions:
- 0≤|Δz1|/DOFe≤1.5 (1)
- 0≤|Δz2|/DOFe≤2 (2)
- where Δz1 indicates a difference between a position on an optical axis at which an RMS wavefront aberration in an h line is minimized and a position on the optical axis at which an RMS wavefront aberration in an e line is minimized, Δz2 indicates a difference between a position on the optical axis at which an RMS wavefront aberration in light having a wavelength of 800 nm is minimized and the position on the optical axis at which an RMS wavefront aberration in the e line is minimized, and DOFe indicates a depth of focus for the e line.
An objective comprising:
- a first lens group that includes a meniscus lens component that is closest to an image among lens components of the first lens group, the meniscus lens component having a convex surface facing an object;
- and
- a second lens group that is closer to the image than the first lens group is, wherein
- the objective satisfies the following conditional expressions:
- 0≤|Δz1|/DOFe≤1.5 (1)
- 9 mm≤Yreso×|β|≤20 mm (3)
- where Δz1 indicates a difference between a position on an optical axis at which an RMS wavefront aberration in an h line is minimized and a position on the optical axis at which an RMS wavefront aberration in an e line is minimized, DOFe indicates a depth of focus for the e line, Yreso indicates a maximum object height within a region on a plane orthogonal to the optical axial that crosses the position on the optical axis at which an RMS wavefront aberration in the e line is minimized, the region having an RMS wavefront aberration in the e line that is 0.2λe or less provided therewithin, λe indicates a wavelength of the e line, and β indicates a magnification of the objective.
Dependencies are inferred from the claim text.