US 12,585,098 B2Granted

Microscope objective lens

AssigneeChangzhou AAC Raytech Optronics Co., Ltd.

InventorsKaoru Yamazaki, Takashi Iwasaki

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Abstract

Disclosed is a microscope objective lens including from an emitting side to an objective side: the first lens to the twelfth lens. The focal length of the microscope objective lens is f, the numerical aperture is NA, and the working distance is WD. A focal length of a lens group consisting of the first lens to the fourth lens is f1−4, and a combined focal length between the seventh lens and the eighth lens is f78. The on-axis distances of the seventh and the eighth lens are d13 and d15, and an on-axis distance from the seventh lens to the eighth lens is d14. The central radiuses of curvature of the emitting surface and the objective surface of the eleventh lens are R21 and R22, respectively. The following relationship expressions are satisfied: 0.09≤f1−4/f≤0.15; −1.35≤f78/(d13+d14+d15)≤−0.95; −7.00≤R21/R22≤−2.00; 0.20≤NA*f/WD≤0.26. This microscope objective lens has excellent optical characteristics, and low aberration.

Claims15

Dependent claims

A microscope objective lens, comprising in order from an emitting side to an objective side:

a first lens having a positive refractive force;
a second lens having a positive refractive force;
a third lens having a negative refractive force;
a fourth lens having a negative refractive force;
a fifth lens having a positive refractive force;
a sixth lens having a negative refractive force;
a seventh lens having a negative refractive force;
an eighth lens having a negative refractive force;
a ninth lens having a positive refractive force;
a tenth lens having a negative refractive force;
an eleventh lens having a positive refractive force;
and
a twelfth lens having a positive refractive force;
wherein a focal length of the microscope objective lens is f;
a focal length of a lens group consisting of the ninth lens, the tenth lens, the eleventh lens, and the twelfth lens is f9-12;
a combined focal length of the seventh lens and the eighth lens is f78;
an on-axis thickness of the seventh lens is d13;
an on-axis thickness of the eighth lens is d15;
an on-axis distance from an objective surface of the seventh lens to an emitting surface of the eighth lens is d14;
a central radius of curvature of an emitting surface of the eleventh lens is R21;
a central radius of curvature of an objective surface of the eleventh lens is R22;
a numerical aperture of the microscope objective lens is NA;
a working distance of the microscope objective lens is WD, and the following relationship expressions are satisfied:
0.09
≤
f
⁢
9
-
12
/
f
≤
0.15
;
-
1.35
≤
f
⁢
78
/
(
d
⁢
13
+
d
⁢
14
+
d
⁢
15
)
≤
-
0
.95
;
-
7.
⁢
0
≤
R
⁢
21
/
R
⁢
22
≤
-
2
.00
;
0.2
≤
NA
*
f
/
WD
≤
0
⁢
2
⁢
6
.

88 more elements

Dependencies are inferred from the claim text.

Facts

Application: 18/391,570Filed 20 Dec 2023
Priority: CN 202310729717.919 Jun 2023
Published: US 2024/0418975 A119 Dec 2024
Granted: 24 Mar 2026
Term ends: Not estimatedThe source records don’t support an estimate.

Classification4 codes

G02B 21/02
Microscopes: objectives
G02B 9/64
Optical objectives characterised both by the number of the components and their arrangements according to their sign, i.e. + or -: having more…
G02B 13/00
Optical objectives specially designed for the purposes specified below
G02B
Optical elements, systems or apparatus