Patent ID: 9606338
Date: 2017-03-28
CPC Classifications: G02B

Claim:
1. A zoom lens, consisting essentially of: 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, in order from the object side, wherein, upon zooming from the wide angle end to the telephoto end, the first lens group, the second lens group, and the third lens group are moved along the optical axis such that the distance between the first lens group and the second lens group is reduced, and the distance between the second lens group and the third lens group is increased, wherein the first lens group consists essentially of a negative lens and a positive lens in order from the object side, wherein the second lens group consists essentially of a positive lens, a positive lens having a biconvex shape, a negative lens, and a positive lens in order from the object side, and wherein the zoom lens satisfies conditional expressions (1) to (5′) given below: where