Zoom lens system
US6191895A · kind A · utility
9Cited by
0References
24Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 2, 1998 |
| Grant date | Feb 20, 2001 |
| Priority date | — |
| Expiry date | Oct 2, 2018 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144105
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system has, from the object side, a first lens unit having a optical power, a second lens unit having a negative optical power a third lens unit having a positive optical power, and a succeeding lens unit. The first and the third lens units monotonically move toward the object side during zooming from the shortest focal length condition to the longest focal length condition. A number of predetermined conditions are disclosed which can be satisfied to ensure a high quality, compact zoom lens for a digital camera.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.