Zoom lens system
US7554748B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | May 24, 2006 |
| Grant date | Jun 30, 2009 |
| Priority date | — |
| Expiry date | Apr 12, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/1425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An exemplary zoom lens system includes a negative first lens group and a positive second lens group. The first lens group includes a meniscus-shaped first lens with negative refracting power and a second lens with positive refracting power. The first lens has a concave surface facing an image side. The second lens group includes an aperture stop, a biconvex third lens with positive refracting power, and a meniscus-shaped fourth lens with negative refracting power. The fourth lens has a concave surface facing an object side. The first lens, the second lens, the aperture stop, the third lens and the fourth lens are aligned in that order from the object side to the image side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.