Zoom lens and image capture apparatus
US7817346B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 25, 2007 |
| Grant date | Oct 19, 2010 |
| Priority date | — |
| Expiry date | Mar 29, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/282
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens includes, in an order from an object side, a first lens group having positive refractive power; a second lens group having negative refractive power; a third lens group having positive refractive power; and a fourth lens group having positive refractive power, and in which, during power variation from a wide-angle end to a telephoto end, a distance between the first lens group and the second lens group increases, a distance between the second lens group and the third lens group decreases, and a distance between the third lens group and the fourth lens group decreases, and the zoom lens includes at least one cemented-triplet lens block having negative refractive power, in the fourth lens group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.