Zoom lens
US6404562B1 · kind B1 · utility
43Cited by
4References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 18, 2000 |
| Grant date | Jun 11, 2002 |
| Priority date | — |
| Expiry date | May 18, 2020 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/142
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens to form an image of an object with variable magnification, is provided with a first lens group having a positive refracting power, and a second lens group positioned closer to the image than the first lens group and having a negative refracting power. When the magnification is changed, a distance between the first lens group and the second lens group is changed. The first lens group comprises a 1-1 lens, a 1-2 lens and a 1-3 lens aligned in this order from the object. The zoom lens comprises at least two plastic lenses.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.