Zoom lens system, imaging apparatus, method for vibration reduction, and method for varying focal length
US7492524B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jul 18, 2007 |
| Grant date | Feb 17, 2009 |
| Priority date | — |
| Expiry date | Jul 18, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/646
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
Providing a zoom lens system with a vibration reduction function, a high zoom ratio, and a wide angle of view, an imaging apparatus, a method for vibration reduction, and a method for varying a focal length. The system includes, in order from an object, a first lens group having positive power, a second lens group having negative power, a third lens group having positive power, and a fourth lens group having positive power. Upon zooming from a wide-angle end to a telephoto end, a distance between the first and the second lens groups increases, a distance between the second and the third lens groups decreases, and a distance between the third and the fourth lens groups varies. The third lens group consists of a front group and a rear group. Vibration reduction is carried out by moving only the rear group perpendicularly to the optical axis. Given conditions are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.