Zoom lens system
US5253114A · kind A · utility
6Cited by
5References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 9, 1993 |
| Grant date | Oct 12, 1993 |
| Priority date | — |
| Expiry date | Feb 9, 2013 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143503
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system is arranged in three lens groups, in the order from object side to image plane side, that the first lens group has negative refractive power, the second lens group has positive refractive power, and the third lens group has negative refractive power. During zooming operation from wide angle position to telephoto position, the three lens groups vary the separations therebetween and together move toward the object side of the lens system. The first lens group of the lens system is composed of a negative lens element and a positive lens element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.