Imaging lens, optical apparatus and method for forming image using this imaging lens
AssigneeNikon Corporation
InventorToshinori Take
Life of this patent
Estimating the term…
Abstract
An imaging lens includes a first lens group having a positive refractive power, an aperture stop, and a second lens group having a positive refractive power, which are disposed in order from an object. The first lens group has a first lens component having a negative refractive power and a second lens component having a positive refractive power, which are disposed in order from the object, and conditions expressed by the expressions 0.12<f/f1<0.47 and 0.016<D12/f<0.079 are satisfied, when f1 is a focal length of the first lens group, f is a focal length of the imaging lens, and D12 is an air distance between the first lens component and the second lens component of the first lens group.
Claims37
An imaging lens, comprising an object side lens group having a positive refractive power and an image side lens group having a positive refractive power with an air distance from the object side lens group, which are disposed in order from the object,
- the image side lens group further including a cemented lens of a negative lens component having a concave surface facing the object and a positive lens component having a convex surface facing the image, and a biconvex positive lens component, which are disposed in order from the object, and
- all or a part of the image side lens group being able to be shifted in a direction substantially perpendicular to the optical axis as a shift lens group.
A method for manufacturing an imaging lens, comprising the steps of:
- assembling an object side lens group having a positive refractive power and an image side lens group having a positive refractive power with an air distance from the object side lens group in a lens barrel in order from the object side;
- configuring the image side lens group by disposing a cemented lens of a negative lens component having a concave surface facing the object and a positive lens component having a convex surface facing the image, and a biconvex positive lens component in order from the object when the step of assembling is performed;
- and
- assembling all or a part of the image side lens group as a shift lens group to be shifted in a direction substantially perpendicular to the optical.
Dependencies are inferred from the claim text.