Variable power optical system
US7558004B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 5, 2007 |
| Grant date | Jul 7, 2009 |
| Priority date | — |
| Expiry date | Jul 13, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A variable power optical system is provided and includes a positive first lens group, a negative second lens group, a positive fifth lens group, a positive third lens group, and a negative fourth lens group containing first to third sub lens groups, in order from the side of an object. The second lens group is moved, thereby performing variable power and the third lens group is moved, thereby correcting image surface variation caused by the variable power and performing focusing. The fourth lens group is fixed at the variable power time and the focusing time. To correct image blurring, only the second sub lens group is moved in a direction perpendicular to an optical axis. Accordingly, a sufficiently good image blurring correction function can be exerted and a simple and compact configuration as a whole can be implemented.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.