Optical system, optical apparatus, and method for manufacturing optical system
US11714292B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 2018 |
| Grant date | Aug 1, 2023 |
| Priority date | — |
| Expiry date | May 16, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.