Patent ID: 9122041
Filing Date: 2015-09-01
Classification: G02B,H04N

Abstract:
1. 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 positive refractive power that are sequentially arranged from an object side, wherein during zooming from a wide angle position to a telephoto position, a distance between the first lens group and the second lens group decreases and a distance between the second lens group and the third lens group increases, the first lens group comprises a first lens having a negative refractive power and is a double-concave lens and a second lens having a positive refractive power that are sequentially arranged from the object side, the second lens group comprises an image-side lens having a positive refractive power, being disposed closest to an image side, and is a meniscus lens having a concave surface toward the object side, and the zoom lens satisfies the following Equations:  where, 3Vd indicates an Abbe's number of a lens comprised in the third lens group, f