Microscope objective lens
AssigneeAAC Raytech 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 in particular, relates to a microscope objective lens suitable for use in a device such as a microscope. The microscope objective lens includes, in order from an emitting side to an objective side: a first lens having a positive refractive force, a second lens having a negative refractive force, a third lens having a negative refractive force, and a fourth lens having a positive refractive force; and the following relationship expressions are satisfied: 5.00≤f12/(d1+d2+d3)≤8.00; −4.00≤R7/R8≤−1.50; 0.38≤f4/f≤0.53; 0.20≤WD/TTL≤0.40. The microscope objective lens of the present application has excellent optical performance, low aberration, a large field of view without distortion, and a 2-fold magnification, which is particularly suitable for optical microscopes.
Claims8
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 negative refractive force;
- a third lens having a negative refractive force;
- and
- a fourth lens having a positive refractive force;
- wherein an on-axis thickness of the first lens is d1;
- an on-axis distance from the first lens to the second lens is d2;
- an on-axis thickness of the second lens is d3;
- a combined focal length of the first lens and the second lens is f12;
- a central radius of curvature of an emitting surface of the fourth lens is R7;
- a central radius of curvature of an objective surface of the fourth lens is R8;
- a focal length of the fourth lens is f4;
- focal length of the microscope objective lens is f;
- an on-axis distance from an objective surface of the microscope objective lens to an objective surface of the fourth lens is WD;
- an on-axis distance from the objective surface of the microscope objective lens to an emitting surface of the first lens is TTL, and the following relationship expressions are satisfied:
- 5.
- ≤
- f
-
- 12
- /
- (
- d
-
- 1
- +
- d
-
- 2
- +
- d
-
- 3
- )
- ≤
- 8.
- ;
- -
- 4.
-
- 0
- ≤
- r
-
- 7
- /
- r
-
- 8
- ≤
- -
- 1.5
- ;
- 0.38
- ≤
- f
-
- 4
- /
- f
- ≤
- 0
- .53
- ;
- 0.2
- ≤
- WD
- /
- TTL
- ≤
- 0.4
- .
Dependencies are inferred from the claim text.