Zoom lens
US6175453A · kind A · utility
1Cited by
1References
19Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Aug 11, 1999 |
| Grant date | Jan 16, 2001 |
| Priority date | — |
| Expiry date | Aug 11, 2019 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/144113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved zoom lens constitutes a plurality of lens groups of different focal length. Through adjusting the position of the lens groups, different zooming ratio may be obtained. Higher image resolution and lower cost may also be achieved through using different lens material. The lens groups have respectively focal length combination of positive, negative, positive and positive. The second and fourth lens groups are movable for obtaining high quality image.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.