Imaging apparatus and zoom lens with a shift lens group
US7652688B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 25, 2007 |
| Grant date | Jan 26, 2010 |
| Priority date | — |
| Expiry date | Jul 18, 2028 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens including a plurality of lens groups and varying magnification by changing a distance between lens groups, wherein a last lens group positioned on an image side closest thereto with a negative part group having negative refractive power and a positive part group arranged adjacent on the image side thereof and having positive refractive power, wherein the positive part group is shifted in a direction vertical to an optical axis to shift an image, and Equations (1) and (2) are satisfied,−0.30<fgn/(Ngn·fT)<−0.05 (1)νgn−νgis>30 (2)where, fgn: focal length of the negative part group, Ngn: average refractive index of the negative part group, fT: focal length of the entire system at a telephoto end, νgn: composite Abbe number of the negative part group, and νgis: composite Abbe number of the positive part group.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.