US 2015/0085357 A1Published application

Optical imaging system

AssigneeCarl Zeiss Meditec AG

InventorsFranz Merz, Artur Hoegele

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Abstract

An optical imaging system generates an image of an object plane and includes a lens system which, in turn, includes a main objective and a reduction optical unit ahead of the main objective. The lens system is aligned along an optical axis and the reduction optical unit includes a first lens with a positive refractive power and a second lens with a negative refractive power. An object-side first main plane and an image-side second main plane are defined by the lens system. The optical imaging system defines an observation beam path which is guided through the lens system so that, in the first main plane and in the second main plane, the observation beam path is at a distance (B) from the optical axis. The first lens is of a first material having a first Abbe number and the second lens is of a second material having a second Abbe number, wherein the first Abbe number is greater than the second Abbe number.

Claims8

Dependent claims

An optical imaging system for generating an image of an object plane, the optical imaging system defining an optical axis and comprising:

a lens system including a main objective and a reduction optical unit arranged between said main objective and said object plane;
said lens system being aligned along said optical axis;
said reduction optical unit including a first lens having a positive refractive power and a second lens having a negative refractive power;
said lens system defining an object-side first main plane (H) and an image-side second main plane (H′);
said optical imaging system defining an observation beam path which is guided through said lens system so as to cause said observation beam path to be at a distance (B) from the optical axis of the lens system in each of said first main plane (H) and said second main plane (H′);
said first lens being made from a first material having a first Abbe number;
said second lens being made from a second material having a second Abbe number;
said first Abbe number being greater than said second Abbe number;
and,
said lens system being configured so as to cause the following relation to be satisfied for a wavelength range (λ of 480 nm≦λ≦660 nm and for a main wavelength e=546 nm:

arctan

(
B
f
e
′
+
(
f
e
·
f
e
′
/
(
f
λ
-
f
e
)
)
)

<
0.5
′
,
wherein:
fe=object-side focal length for the main wavelength (e) with respect to said first main plane (H);
fλ=object-side focal length for the wavelength (λ) with respect to said first main plane (H);
and,
fe′=image-side focal length for the main wavelength (e) with respect to said second main plane (H′).

43 more elements

Dependencies are inferred from the claim text.