Patent ID: 8587878
Filing Date: 2013-11-19
Classification: G02B

Abstract:
1. An image-forming lens consisting of: from an object side to an image side in the following order, a first lens group with a positive refractive power; an aperture stop; and a second lens group with a positive refractive power, and the second lens group including: from the object side to the image side in the following order, a second F lens group with a positive refractive power in which a biconvex lens and a biconcave lens are cemented to each other; a second M lens group having a concave shape on a surface on a most object side and a convex shape on a surface on a most image side; and a second R lens group of a positive lens, wherein an interval between the first lens group and the second lens group in the state of focusing on an object at infinity: A