Patent ID: 9279967
Filing Date: 2016-03-08
CPC Classification: G02B

Claim Text:
1. A zoom lens comprising, in order from an object side to an image-forming side: a first lens group having negative refractive power; a second lens group having positive refractive power and consisting of, in order from the object side to the image-forming side, three lenses separated from one another and having positive refractive power, positive refractive power, and negative refractive power, respectively, wherein the refractive index of the lens nearest to the object side is NDo, the refractive index of the lens nearest to the image-forming side is NDi, and NDo and NDi satisfy: NDi−NDo>0; and a third lens group having positive refractive power; wherein an Abbe number of the lens of the second lens group nearest to the object side is VDo, an Abbe number of the lens of the second lens group nearest to the image-forming side is VDi, and VDo and VDi satisfy: VDo−VDi>29.