Zoom lens and image pickup apparatus including the same
US8928798B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 5, 2013 |
| Grant date | Jan 6, 2015 |
| Priority date | — |
| Expiry date | Aug 5, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/173
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens, including, in order from object side to image side: a positive first lens unit which does not move during zooming; a negative second lens unit for zooming; a positive third lens unit for zooming; a negative fourth lens unit which moves during zooming; and a positive fifth lens unit which does not move during zooming, in which: 0.6<|β3F|<1.0, −4.0<f4/f3<−1.0, and 20<L2w/L3w<300 are satisfied, where β3F is a lateral magnification of the third lens unit at a position at which a lateral magnification of the second lens unit becomes −1; f3 and f4 are respectively focal lengths of the third and fourth lens units; L2w is a gap between the second and third lens units at a wide angle end; and L3w is a gap between the third and fourth lens units at the wide angle end.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.