Zoom lens system
US5786941A · kind A · utility
6Cited by
8References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 7, 1995 |
| Grant date | Jul 28, 1998 |
| Priority date | — |
| Expiry date | Jul 7, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B7/102
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system includes a plurality of lens units. First to third focal length zones are set according to the focal length. During focusing, in the first focal length zone, the lens units are moved at a first constant ratio, and in the third focal length zone, the lens units are moved at a second constant ratio which is different from the first constant ratio. In the second focal length zone, the movement ratio of the lens units varies according to the focal length.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.