Large magnification factor zoom lens
US7746563B2 · kind B2 · utility
9Cited by
5References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 19, 2007 |
| Grant date | Jun 29, 2010 |
| Priority date | — |
| Expiry date | Mar 23, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
This large magnification factor zoom lens includes, in an order arranged from an object side, a first lens group having a positive refractive power, a second lens group having a negative refractive power, a third lens group having a positive refractive power, and a fourth lens group having a positive refractive power. The third lens group includes, in an order arranged from the object side, a positive lens, a positive lens, a positive meniscus lens having a larger radius of curvature on an image surface side, and a negative lens. The positive lens has an aspherical surface on an object side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.