Zoom lens system
US5969881A · kind A · utility
9Cited by
2References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Nov 25, 1997 |
| Grant date | Oct 19, 1999 |
| Priority date | — |
| Expiry date | Nov 25, 2017 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/1425
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system has, from the object side, a first lens unit and a second lens unit. The first lens unit has a negative optical power. The second lens unit has a positive optical power. The second lens unit includes front and rear lens units which each have a positive optical power. The front lens unit is shifted in a direction perpendicular to the optical axis to compensate for an image blurring. The zoom lens system fulfills the condition 0<.phi.2R/.phi.2F<1.0, where .phi.2R and .phi.2F represent optical powers of the rear and front lens units, respectively.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.