Zoom lens
AssigneesSintai Optical (Shenzhen) Co., Ltd., Asia Optical International Ltd.
InventorYu-Min Chang
Life of this patent
Estimating the term…
Abstract
A zoom lens includes a first lens group, a second lens group and a third lens group, all of which are arranged in sequence from an object side to an image side along an optical axis. The first lens group is with negative refractive power and includes a first lens, a second lens and a third lens, wherein the first lens is with negative refractive power, the second lens is with positive refractive power and the third lens is with negative refractive power. The second lens group is with positive refractive power. The third lens group is with positive refractive power. The third lens satisfies |R31/R32|≦0.39, wherein R31 is a radius of curvature of an object side surface of the third lens and R32 is a radius of curvature of an image side surface of the third lens.
Claims22
A zoom lens comprising a first lens group, a second lens group and a third lens group, all of which are arranged in sequence from an object side to an image side along an optical axis, wherein:
- the first lens group is with negative refractive power and comprises a first lens, a second lens and a third lens, all of which are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens is with negative refractive power, the second lens is with positive refractive power and the third lens is with negative refractive power;
- the second lens group is with positive refractive power;
- the third lens group is with positive refractive power;
- and
- the third lens satisfies |R31/R32|≦0.39, wherein R31 is a radius of curvature of an object side surface of the third lens and R32 is a radius of curvature of an image side surface of the third lens.
A zoom lens comprising a first lens group, a second lens group and a third lens group, all of which are arranged in sequence from an object side to an image side along an optical axis, wherein:
- the first lens group is with negative refractive power and comprises a first lens, a second lens and a third lens, all of which are arranged in sequence from the object side to the image side along the optical axis, wherein the first lens is with negative refractive power, the second lens is with positive refractive power and the third lens is with negative refractive power;
- the second lens group is with positive refractive power and comprises a fourth from the object side to the image side along the optical axis, wherein the sixth lens is with negative refractive power;
- and
- the third lens group is with positive refractive power.
Dependencies are inferred from the claim text.