Patent ID: 9470873
Filing Date: 2016-10-18
CPC Classification: G02B

Claim Text:
1. An imaging lens substantially consisting of a first lens group having a positive refractive power and a second lens group having a positive refractive power in this order from the object side, wherein focusing is performed by moving the entirety of the second lens group along the optical axis; the first lens group comprises a first lens having a positive refractive power which is disposed on the most-object side, a second lens having a negative refractive power which is disposed next to the first lens on the image side, a third lens having a negative refractive power which is disposed next to the second lens on the image side, a fourth lens having a positive refractive power which is disposed next to the third lens on the image side, and a fifth lens having a positive refractive power which is disposed next to the fourth lens on the image side; and the imaging lens satisfies conditional formula (1): where νd2: the Abbe number of the second lens with respect to the d-line, and νd3: the Abbe number of the third lens with respect to the d-line.