US 2015/0316750 A1Published application

Lens system with six lenses

AssigneeZhejiang Sunny Optics Co., Ltd.

InventorsFujian Dai, Lin Huang

Life of this patent

Estimating the term…

Loading patent…

Abstract

The present disclosure relates to a lens system comprising a first lens group and a second lens group from an object side to an image side successively; wherein, the first lens group comprises a first lens, a second lens and a third lens from the object side to the image side successively; the second lens group comprises a fourth lens, a fifth lens and a sixth lens from the object side to the image side successively; the first lens has a positive focal power and the second, the fifth, and the sixth lens have a negative focal power, and the object side surface of the first and the second lens are convex, the image side surface of the fifth lens is convex, the object side surface of the fifth and the sixth lens are concave, and the image side surface of the second and the sixth lens are concave.

Claims18

Dependent claims

A lens system, comprising a first lens group and a second lens group from an object side to an image side successively, wherein

the first lens group comprises a first lens, a second lens and a third lens from the object side to the image side successively;
the second lens group comprises a fourth lens, a fifth lens and a sixth lens from the object side to the image side successively,
the first lens has a positive focal power and the object side surface of the first lens is convex, the second lens has a negative focal power and the object side surface of the second lens is convex, the fifth lens has a negative focal power and the image side surface of the fifth lens is convex, the sixth lens has a negative focal power and the object side surface of the sixth lens is concave, the image side surface of the second lens is concave, the object side surface of the fifth lens is concave, the image side surface of the sixth lens is concave, and
the lens system satisfies conditional expressions as follows:
−6.8<f4.5.6/Dr7r12<−3.0;
and
−3.2<f4.5.6/f<−1.65,
in which, f4.5.6 represents an effective focal length of the second lens group, Dr7r12 represents an axis distance between the object side surface of the fourth lens and the image side surface of the sixth lens, and f represents the effective focal length of the lens system.

5 more elements

A lens system, comprising a first lens group and a second lens group from an object side to an image side successively, wherein

the first lens group comprises a first lens, a second lens and a third lens from the object side to the image side successively, the second lens group comprises a fourth lens, a fifth lens and a sixth lens from the object side to the image side successively;
the first lens has a positive focal power and the object side surface of the first lens is convex, the second lens has a negative focal power and the object side surface of the second lens is convex, the fifth lens has a negative focal power and the image side surface of the fifth lens is convex, the sixth lens has a negative focal power and the object side surface of the sixth lens is concave, the image side surface of the second lens is concave, the object side surface of the fifth lens is concave, the image side surface of the sixth lens is concave, and
the lens system satisfies conditional expressions as follows:
−6.8<f4.5.6/Dr7r12≦5;
and
−3.2<f4.5.6/f≦3.1,
in which, f4.5.6 represents an effective focal length of the second lens group, Dr7r12 represents an axis distance between the object side surface of the fourth lens and the image side surface of the sixth lens, and f represents the effective focal length of the lens system.

4 more elements

Dependencies are inferred from the claim text.