Zoom lens system
US7136231B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Feb 25, 2004 |
| Grant date | Nov 14, 2006 |
| Priority date | — |
| Expiry date | Feb 25, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system having high zoom ratio capable of shifting an image for vibration reduction correction. 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. Each of the first lens group through the fourth lens group moves such that when zooming from a wide-angle end state to a telephoto end state, 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 group decreases. The third lens group includes at least two sub-lens groups having positive refractive power. Image shifting carried out by moving either of the two sub-lens groups perpendicularly to the optical axis. Given conditions are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.