Patent ID: 8098301
Filing Date: 2012-01-17
Classification: G02B

Abstract:
1. A zoom lens comprising, in sequence from the object side to the image side: a first lens group; a second lens group having a negative refractive power; a third lens group having a positive refractive power; and a fourth lens group having a positive refractive power, wherein zooming and correction of an imaging position during zooming are performed by moving at least one of the second lens group and the third lens group, wherein the first lens group includes, in sequence from the object side to the image side, a single lens having a negative refractive power, a prism for bending a light path, and a single lens having a positive refractive power and made of a resin material, wherein the second lens group includes, in sequence from the object side to the image side, one lens having a negative refractive power and made of a resin material and one lens having a positive refractive power and made of a resin material, and wherein the following conditional expressions are satisfied, where f 12 is a focal length of the single lens having a positive refractive power included in the first lens group, f 2 is a focal length of the second lens group, fw is a focal length of the total lens system at a wide angle end, νd 21 is an Abbe number of the lens having a negative refractive power included in the second lens group for the d-line, and νd 22 is an Abbe number of the lens having a positive refractive power included in the second lens group for the d-line.