Zoom lens system
US6785055B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | May 16, 2002 |
| Grant date | Aug 31, 2004 |
| Priority date | — |
| Expiry date | May 16, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/1465
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system has, in order from an enlargement side, a first lens unit having negative optical power, a second lens unit having positive optical power, a third lens unit having positive optical power, a fourth lens unit having negative optical power, including an aperture stop, a fifth lens unit having positive or negative optical power, and a sixth lens unit having positive optical power. Zooming is achieved by varying the first to fifth variable distances between the lens units. The third and fifth lens units move from the enlargement side to the reduction side during zooming from the telephoto end to the wide-angle end. The zoom lens system is substantially telecentric toward the reduction side.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.