Microscope objective lens
AssigneeAAC Optics (Changzhou) Co., Ltd.
InventorZhanli Guo
Life of this patent
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Abstract
The present application relates to the field of optical lenses and discloses a microscope objective lens. The microscope objective lens includes in order from the emitting side to the objective side: a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens, and the following relationship expressions are satisfied: 1.50≤NA*f≤3.00; 0.15≤d4/TTL≤0.25; 5.00≤f12/f≤15.00; −7.00≤(R23+R24)/(R23−R24)≤−1.50. The microscope objective lens of the present application is capable of being used as a lens of the microscope with good optical performance, a large numerical aperture, and a wide working band with a magnification of 50 times.
Claims16
A microscope objective lens, comprising in order from an emitting side to an objective side:
- a first lens, a second lens, a third lens, a fourth lens, a fifth lens, a sixth lens, a seventh lens, an eighth lens, a ninth lens, a tenth lens, an eleventh lens, and a twelfth lens;
- wherein a numerical aperture is NA;
- a focal length of the microscope objective lens is f;
- an air spacing between the second lens and the third lens on an optical axis is d4;
- an optical total length of the microscope objective lens is TTL;
- a focal length of the twelfth lens is f12;
- a central radius of curvature of an emitting surface of the twelfth lens is R23;
- a central radius of curvature of an objective surface of the twelfth lens is R24, and the following relationship expressions are satisfied:
- 1.5
- ≤
- NA
- *
- f
- ≤
- 3.
- ;
-
- 0.15
- ≤
- d
-
- 4
- /
- TTL
- ≤
- 0.25
- ;
-
- 5.
- ≤
- f
-
- 12
- /
- f
- ≤
- 15.
- ;
-
- -
- 7.
- ≤
- (
- R
-
- 23
- +
- R
-
- 24
- )
- /
- (
- R
-
- 23
- -
- R
-
- 24
- )
- ≤
- -
- 1.5
- .
Dependencies are inferred from the claim text.