Zoom lens system and image pickup apparatus using the same
US7471459B2 · kind B2 · utility
13Cited by
4References
27Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 7, 2006 |
| Grant date | Dec 30, 2008 |
| Priority date | — |
| Expiry date | Jan 28, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143503
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A three-unit zoom lens system comprising, in order from an object side, a first lens unit having a negative refractive power; a second lens unit having a positive refractive power; and a third lens unit having a positive or negative refractive power, wherein during magnification change from a wide-angle end to a telephoto end, a space between the first lens unit and the second lens unit narrows, the second lens unit and the third lens unit move toward the only object side, and a space between the second lens unit and the third lens unit changes during a focusing operation.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.