Optical system, optical device, and method for manufacturing optical system
AssigneeNikon Corporation
InventorsSatoshi MIWA, Hiroshi YABUMOTO
Life of this patent
Estimating the term…
Abstract
[Problem to be Solved] There are provided an optical system having good imaging performance, an optical apparatus, and a method for manufacturing the optical system. [Solution] An optical system OL used in an optical apparatus, such as a camera 1, includes a diffractive optical element GD and at least one specific lens Lp, which is a lens made of crystalline glass. The specific lens Lp satisfies the condition expressed by the following expression: θgFp+0.0017×νdp<0.730, where θgFp represents partial dispersion ratio of a medium of the specific lens Lp, and νdp represents the Abbe number of the medium of the specific lens Lp at a d line.
Claims29
An optical system comprising:
- a diffractive optical element;
- and
- at least one lens made of crystalline glass.
A method for manufacturing an optical system, the method comprising:
- disposing a diffractive optical element;
- and
- disposing at least one lens made of crystalline glass.
Dependencies are inferred from the claim text.