Optical system, optical apparatus and method for manufacturing the optical system
US12061324B2 · kind B2 · utility
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9Claims
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Key dates
| Filing date | Aug 26, 2020 |
| Grant date | Aug 13, 2024 |
| Priority date | — |
| Expiry date | Sep 27, 2040 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/16
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system (LS) has an aperture stop (S), and a negative lens (L73) disposed closer to the image side than the aperture stop (S) and satisfying the following conditional expressions. −0.010<ndN2−(2.015−0.0068×νdN2),50.00<νdN2<65.00,0.545<θgFN2,−0.010<θgFN2−(0.6418−0.00168×νdN2) where ndN2 is the refractive index to the d line of the negative lens, νdN2 is the Abbe number with respect to the d line of the negative lens, and θgFN2 is the partial dispersion ratio of the negative lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.