Lens and optical observation device

Patent metadata

Field	Value
Publication number	US-2016131900-A1
Application number	US-201414769109-A
Country	US
Kind code	A1
Filing date	Feb 18, 2014
Priority date	Feb 21, 2013
Publication date	May 12, 2016
Grant date	—

Abstract

The invention relates to a lens ( 1 ), comprising a first lens unit ( 3 ), at least one second lens unit ( 5 ), and at least one pupil ( 7 ) having a pupil radius. The first lens unit ( 3 ) and the second lens unit ( 5 ) are arranged at a distance from each other along an optical axis (OA) of the objective, such that an intermediate space is present between the first lens unit ( 3 ) and the second lens unit ( 5 ). The second lens unit ( 5 ) is arranged on the image side with respect to the first lens unit ( 3 ). The first lens unit ( 3 ) is designed in such a way that the first lens unit produces a collimated beam.

First claim

1 . An objective with a first lens unit, at least one second lens unit and a real pupil, wherein:
the first lens unit and the second lens unit are arranged at a distance from each other along an optical axis of the objective so that an intermediate space is present between the first lens unit and the second lens unit, and the second lens unit is arranged on the image side relative to the first lens unit; the first lens unit is constructed in such a manner that it generates a collimated beam; the real pupil is located in the intermediate space between the first lens unit and the second lens unit.

2 . The objective according to claim 1 in which the first lens unit, meets at least the condition



h
1

-

f
FG

·
sin





σ
0

h
1



≤
x

,

for the pupil range present between 0% and 100% of the pupil radius, wherein
h 1 designates the level of incidence of the opening ray at the location of the pupil,
σ 0 designates the angle of the inclination of the beam of the edge beam opposite the optical axis,
f′FG designates the object-side focal length of the first lens unit in air, and
n 0 designates the index of refraction adjacent to the first lens unit on the object side.

3 . The objective according to claim 2 in which the first lens unit meets at least the condition:



h
1

-

f
FG

·
sin





σ
0

h
1



≤
0.15

for the range located between 0 and 71% of the pupil radius.

4 . The objective according to claim 2 , in which the first lens unit comprises an aspherical lens.

5 . The objective according to claim 4 , in which the first lens unit is telecentrically constructed on the object side.

6 . The objective according to claim 5 , in which at least one pupil filter is arranged between the first lens unit and the second lens unit.

7 . The objective according to claim 6 , in which at least one wave front manipulator is arranged in the intermediate space between the first lens unit and the second lens unit as a pupil filter, and the wave front manipulator comprises a first optical component with at least one refractive freeform surface or with a diffractive surface and comprises at least one second optical component with at least one refractive freeform surface or with a diffractive surface, wherein the first optical component and the second optical component are arranged successively along the optical axis and can be moved relative to one another in a direction of movement vertical to the optical axis.

8 . The objective according to claim 7 , in which an immersion medium contacting the two components is present between the first optical component and the second optical component of the wave front manipulator.

9 . The objective according to claim 8 , in which the immersion medium is a fluid or an elastic optokit.

10 . The objective according to claim 9 , in which the immersion medium has a dispersion course deviating from the normal straight line.

11 . The objective according to one of claim 10 , in which the material of the first optical component and of the second optical component of the wave front manipulator medium has a dispersion course deviating from the normal straight line.

12 . The objective according to one of claim 11 , in which the real pupil is located between the first optical component and the second optical component of the wave front manipulator.

13 . The objective according to one of claim 12 , in which at least one of the following optical elements is arranged in the intermediate space between the first lens unit and the second lens unit as a pupil filter: an apodization filter, a spectral filter or a spatial modulator for light.

14 . The objective according to one of claim 13 , in which at least one second pupil filter is arranged between the first lens unit and the second lens unit.

15 . The objective according to one of claim 14 , in which the second lens unit is afocally constructed.

16 . The objective according to one of claim 15 , which has a numeric aperture of at least 0.8.

17 . The objective according to claim 16 , which is constructed as a microscope objective for cooperating with an immersion medium bordering on the object side on the first lens unit.

18 . An optical observation device with an objective according to claim 1 .

19 . The optical observation device according to claim 19 , which furthermore comprises at least one third lens unit which is arranged on the image side of the objective and generates a real intermediate image together with the objective.

20 . The optical observation device according to claim 20 , in which the third lens unit is a tubular lens group.

21 . The objective according to claim 3 , in which the first lens unit comprises an aspherical lens.

Assignees

• Zeiss Carl Microscopy Gmbh

Inventors

• Pretorius Marco

Classifications

• G02B27/0037

  with diffracting elements (G02B27/0056 takes precedence; holographic optical elements G02B5/32; zone systems G02B5/1876) · CPC title

• G02B27/0068 Primary

  having means for controlling the degree of correction, e.g. using phase modulators, movable elements (controlling the phase of light using moving or deformable elements G02B26/06) · CPC title

• G02B21/02 Primary

  Objectives · CPC title

• G02B13/18

  with lenses having one or more non-spherical faces, e.g. for reducing geometrical aberration {(G02B13/002 takes precedence)} · CPC title

• G02B5/005

  Diaphragms (for cameras G03B9/02) · CPC title