Zoom lens system
AssigneeHanwha Techwin Co., Ltd.
InventorJin Ho JANG
Life of this patent
Estimating the term…
Abstract
A zoom lens system according to an example embodiment includes, sequentially from an object side to an image plane side along an optical axis, a first lens group having a negative refractive power and including at least one doublet lens, the doublet lens including two lenses, a second lens group having a positive refractive power, and a third lens group having a positive refractive power, wherein the first lens group and the second lens group are configured to move along the optical axis to perform zooming and focusing, and the zoom lens system satisfies 3.0<Vdf/Vdr<6.0, where Vdf denotes an Abbe number of a lens arranged at the object side in a doublet lens, and Vdr denotes an Abbe number of a lens arranged at the image plane side in a doublet lens.
Claims19
A zoom lens system comprising:
- a first lens group having a negative refractive power and comprising at least one doublet lens, the doublet lens comprising two lenses;
- a second lens group having a positive refractive power;
- and
- a third lens group having a positive refractive power,
- wherein the first lens group, the second lens group, and the third lens group are sequentially disposed from an object side to an image plane side along an optical axis of the zoom lens system,
- wherein the first lens group and the second lens group are configured to move along the optical axis to perform zooming and focusing, and
- wherein
- 3.0<Vdf/Vdr<6.0,
- where Vdf denotes an Abbe number of a lens arranged at the object side in the doublet lens, and Vdr denotes an Abbe number of a lens arranged at the image plane side in the doublet lens.
A zoom lens system comprising:
- a first lens group having a negative refractive power and comprising at least five lenses;
- a second lens group having a positive refractive power;
- and
- a third lens group having a positive refractive power,
- wherein the first lens group, the second lens group, and the third lens group are sequentially disposed from an object side to an image plane side along an optical axis of the zoom lens system,
- wherein the first lens group and the second lens group are configured to move along the optical axis to perform zooming and focusing, and
- wherein
- 0.9<Fno<1.2,
- where Fno denotes an F-number of the zoom lens system.
A zoom lens system 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 positive refractive power,
- wherein the first lens group, the second lens group, and the third lens group are sequentially disposed from an object side to an image plane side along an optical axis of the zoom lens system, and
- wherein the first lens group and the second lens group are configured to move along the optical axis to perform zooming and focusing, and the first lens group comprises five lenses.
Dependencies are inferred from the claim text.