Variable magnification optical system, optical apparatus provided with same and method for variable magnification using variable magnification optical system
US8730584B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 9, 2009 |
| Grant date | May 20, 2014 |
| Priority date | — |
| Expiry date | Jul 9, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable magnification optical system ZL to be mounted on an electronic still camera 1 or the like is configured to have, in order from the object side, a first lens unit G1 having a positive refractive power, a second lens unit G2 having a negative refractive power, a third lens unit G3 having a positive refractive power, a fourth lens unit G4 having a negative refractive power, and a fifth lens unit G5 having a positive refractive power, and configured in such a manner that, in variable magnification, the first lens unit G1 is fixed, that, in focusing, the third lens unit G3 moves, and that at least a part of the fifth lens unit G5 moves so as to have a component in a substantially orthogonal direction to the optical axis.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.