Optical system, optical apparatus and method for manufacturing the optical system
US11143849B2 · kind B2 · utility
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Key dates
| Filing date | Jul 27, 2017 |
| Grant date | Oct 12, 2021 |
| Priority date | — |
| Expiry date | Jan 22, 2038 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system (OL) used for an optical apparatus such as a camera (1) includes a focusing group (Gf) that moves upon focusing, a diffractive optical element (GD) disposed on an object side of the focusing group (Gf) and a negative lens element (L1n) disposed on the object side of the diffractive optical element (GD). The optical system (OL) satisfies the following expressions 0.030<f/fpf<0.050nd1n+0.006×νd1n<1.91035<νd1n where,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.