Image-taking apparatus
US7180679B2 · kind B2 · utility
5Cited by
5References
17Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jun 23, 2004 |
| Grant date | Feb 20, 2007 |
| Priority date | — |
| Expiry date | Jun 23, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B15/143507
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A zoom lens system for forming an optical image of a subject on the image-sensing surface of an image sensor has three lens units, namely, from the object side thereof, a first lens unit having a negative optical power, a second lens unit having a positive optical power, and a third lens unit having a positive optical power. The lens units each include at least one plastic lens element. The zoom lens system as a whole includes at least one glass lens element that fulfills a prescribed conditional formula.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.