Imaging Lens and Imaging Device

摘要

A telephoto-type imaging lens for short-distance imaging which realizes well focused image with a simple structure through the miniaturization and weight reduction of a focusing lens group, reduction of the load on a drive system for focusing and compact structure of the entire optical system; and an imaging device. The imaging lens includes a first lens group having positive refracting power, a second lens group having negative refracting power and a third lens group having positive refracting power are disposed in order from the object side, wherein at least one positive lens constitutes the second lens group, the first lens group and the third lens group are fixed and the second lens group moves to a focusing side in focusing from infinity to a close object.

主权项

1. An imaging lens comprising:
a first lens group having positive refracting power, a second lens group having negative refracting power and a third lens group having positive refracting power disposed in order from an object side, wherein at least one positive lens comprises the second lens group; wherein the first lens group and the third lens group are fixed and the second lens group moves to a focusing side in focusing from infinity to a close object; and wherein the imaging lens satisfies conditional expressions (1) and (2) below.
0.50≦|B|  (1)0.70≦f3/f≦6.00  (2) where B: Maximum lateral magnification of an optical system f3: Focal length of the third lens group f: Focal length of the optical system at infinity focusing