Zoom lens system and image pickup apparatus using the same
US7450316B2 · kind B2 · utility
9Cited by
5References
26Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 17, 2007 |
| Grant date | Nov 11, 2008 |
| Priority date | — |
| Expiry date | Sep 17, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/145113
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system comprises, in order from an object side, a first lens unit having a positive refractive power, a second lens unit having a negative refractive power, a third lens unit having a positive refractive power and a fourth lens unit having a positive refractive power, during zooming from a wide-angle end to a telephoto end, at least the first lens unit and the third lens unit are moved toward the object side so as to increase a space between the first lens unit and the second lens unit and decrease a space between the second lens unit and the third lens unit, and predetermined conditions are satisfied.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.