Optical system and image pickup apparatus including the same
US9829681B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 30, 2015 |
| Grant date | Nov 28, 2017 |
| Priority date | — |
| Expiry date | Oct 15, 2035 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/54
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Provided is an optical system, which retains enhanced optical performance at any object distance, and has compact and light-weight focus lens units. Provided is an optical system including a plurality of lens units, in which an interval between adjacent lens units changes during focusing, the optical system including: a positive lens unit arranged closest to an object side; first and second focus lens units having negative refractive powers configured to move during focusing; and an intermediate lens unit having a positive refractive power and arranged between the first and second focus lens units. The first and second focus lens units are configured to move toward an image side during focusing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.