Optical system and image pickup apparatus including the same
US10215972B2 · kind B2 · utility
7Cited by
0References
16Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 13, 2017 |
| Grant date | Feb 26, 2019 |
| Priority date | — |
| Expiry date | Sep 13, 2037 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/177
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical system includes an aperture stop, and a focus lens unit arranged on an image side of the aperture stop, the focus lens unit having a negative refractive power and moving during focusing. The focus lens unit moves toward the image side during focusing from infinity to close distance. The focus lens unit includes a positive lens PL and a negative lens NL. An Abbe number νdNL of the material of the negative lens NL, a refractive index NdNL of the material of the negative lens NL at d-line, and an Abbe number νdPL of the material of the positive lens PL are set appropriately.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.