Optical system
AssigneeAsia Optical Co., Inc.
InventorsYao Pei, Fang-Li Ma, Yue-Ye Chen, Hua-Tang Liu
Life of this patent
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Abstract
An optical system includes an optical module. The optical module is with positive refractive power and includes a first lens, a second lens, and a third lens. The first lens is with refractive power and includes a convex surface facing an object side. The second lens is with refractive power. The third lens is a biconcave lens with negative refractive power and includes a concave surface facing the object side and another concave surface facing an image side. The first lens, the second lens, and the third lens are arranged in order from the object side to the image side along an optical axis.
Claims19
An optical system comprising:
- an optical module;
- wherein the optical module is with positive refractive power and comprises a first lens, a second lens, and a third lens;
- wherein the first lens is with refractive power and comprises a convex surface facing an object side;
- wherein the second lens is with refractive power;
- wherein the third lens is a biconcave lens with negative refractive power and comprises a concave surface facing the object side and another concave surface facing an image side;
- wherein the first lens, the second lens, and the third lens are arranged in order from the object side to the image side along an optical axis;
- wherein the optical module satisfies at least one of following conditions:
- 5
- ×
- 1
-
- 0
- -
- 6
- ≤
- fLG
-
- 1
- /
- fLGM
- ≤
- 2
- ×
- 1
-
- 0
- -
- 4
- ;
- 39000
- ≤
- fLGM
- /
- dLG
-
- 1
-
- LG
-
- 2
- ≤
- 83000
- ;
- 0.8
- ≤
- DLG
-
- 1
- /
- DLG
-
- 2
- ≤
- 1.2
- ;
- 0.3
- mm
- -
- 1
- ≤
- (
- R
-
- 12
-
- LG
-
- 2
- /
- R
-
- 11
-
- LG
-
- 1
- )
- /
- MLGM
- ≤
- 4.2
- mm
- -
- 1
- ;
- wherein fLG1 is a combined effective focal length of the first lens and the second lens, fLGM is an effective focal length of the optical module, R12LG2 is a radius of curvature of an image side surface of the third lens, R11LG1 is a radius of curvature of an object side surface of the first lens, dLG1LG2 is an interval from the object side surface of the first lens to the image side surface of the third lens along the optical axis, DLG1 is an effective optical diameter of the first lens, DLG2 is an effective optical diameter of the third lens, and MLGM is a variable magnification of the optical module.
Dependencies are inferred from the claim text.