Zoom lens
AssigneeSamsung Techwin Co., Ltd.
InventorsJae-bum Kim, Young-ran Kim
Life of this patent
Estimating the term…
Abstract
A zoom lens is provided. The zoom lens includes a first lens group having a negative refractive power, a second lens group having a positive refractive power, and a third lens group having a negative refractive power. Here, the first through third lens groups are sequentially arranged from an object side toward an image side. At least the second lens group is moved along an optical axis to change magnification. The expression 3.7 < L T F W < 5.4 is satisfied, where LT denotes a distance on the optical axis from an object-side plane of the first lens group to an image plane at a wide-angle end, and FW denotes an overall focal length of the zoom lens at the wide-angle end. Accordingly, the zoom lens is miniaturized and minimizes a change in aberration due to high magnification.
Claims20
A zoom lens comprising:
- a first lens group having a negative refractive power;
- a second lens group having a positive refractive power;
- and
- a third lens group having a negative refractive power,
- wherein the first through third lens groups are sequentially arranged from an object side toward an image side,
- wherein at least the second lens group is moved along an optical axis in order to change magnification, and
- wherein
- 3.7
- <
- L
- T
- F
- W
- <
- 5.4
- is satisfied, where LT denotes a distance on the optical axis from an object-side plane of the first lens group to an image plane at a wide-angle end, and FW denotes an overall focal length of the zoom lens at the wide-angle end.
A zoom lens comprising:
- a first lens group having a negative refractive power;
- a second lens group having a positive refractive power;
- and
- a third lens group having a negative refractive power,
- wherein the first through third lens groups are sequentially arranged from an object side toward an image side,
- wherein at least the second lens group is moved along an optical axis to change magnification, and
- wherein
- 0.85
- <
-
- F
- 2
- F
- W
-
- <
- 1.20
- is satisfied, where F2 denotes a focal length of the second lens group, and FW denotes an overall focal length of the zoom lens at a wide-angle end.
A zoom lens comprising:
- a first lens group having a negative refractive power;
- a second lens group having a positive refractive power;
- and
- a third lens group having a negative refractive power,
- wherein the first through third lens groups are sequentially arranged from an object side toward an image side,
- wherein at least the second lens group is moved along an optical axis to change magnification, and
- wherein the first lens group satisfies
- 1.20
- <
-
- F
- 1
- F
- W
-
- <
- 2.10
- ,
- where F1 denotes a focal length of the first lens group and FW denotes an overall focal length of the zoom lens at a wide-angle end.
Dependencies are inferred from the claim text.