Microscope objective lens
AssigneeAAC Optics (Changzhou) Co., Ltd.
InventorShiqi Pan
Life of this patent
Estimating the term…
Abstract
The present disclosure relates to the field of camera optical lenses, and discloses a microscope objective lens. The microscope objective lens includes from an object side to an image side: a first lens, a second lens, a third lens, a fourth lens, and a fifth lens, a sixth lens, a seventh lens, an eighth lens and a ninth lens, a following relational expression is satisfied: 0.19≤WD/TTL≤0.36; 4.00≤NA*f≤8.00; 7.00≤f678/f9≤16.00; and −10.00≤(R17+R18)/(R17−R18)≤−1.50. The microscope objective lens provided by the present disclosure has good optical performance of imaging quality, and can meet the requirements of wider working wave band and higher magnification.
Claims12
A microscope objective lens, comprising from an object side to an image side:
- a first lens having a negative refractive power,
- a second lens having a positive refractive power,
- a third lens having a positive refractive power,
- a fourth lens having a negative refractive power,
- a fifth lens having a positive refractive power,
- a sixth lens having a positive refractive power,
- a seventh lens having a negative refractive power,
- an eighth lens having a positive refractive power;
- and
- a ninth lens having a positive refractive power;
- wherein a distance from an object-side surface of the first lens to an observed object is WD, a total optical length from the object-side surface of the first lens to an image plane of the camera optical lens along an optic axis of the microscope objective lens is TTL, an object numerical aperture of the microscope objective lens is NA, a focal length of the microscope objective lens is f, an equivalent focal length of the sixth lens, the seventh lens and the eighth lens is f678, a focal length of the ninth lens is f9, a curvature radius of an object-side surface of the ninth lens is R17, a curvature radius of an image-side surface of the ninth lens is R18, a focal length of the third lens is f3, and following relational expressions are satisfied:
- 0.19
- ≤
- WD
- /
- TTL
- ≤
- 0.36
- ;
- 4.
- ≤
- NA
- ×
- f
- ≤
- 8.
- ;
- 7.
- ≤
- f
-
- 678
- /
- f
-
- 9
- ≤
- 16.
- ;
- 3.
- ≤
- f
-
- 3
- /
- f
- ≤
- 6.
- ;
- and
- -
- 10.
- ≤
- (
- R
-
- 17
- +
- R
-
- 18
- )
- /
- (
- R
-
- 17
- -
- R
-
- 18
- )
- ≤
- -
- 1.5
- .
Dependencies are inferred from the claim text.