Photographing lens
US6985306B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 29, 2003 |
| Grant date | Jan 10, 2006 |
| Priority date | — |
| Expiry date | Dec 29, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/001
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
The photographing lens of the present invention includes, starting from the object side: an aperture stop having a predetermined aperture; a first lens group having a positive overall refractive power; a second lens group having a positive overall refractive power; and a third lens group having a positive overall refractive power. The first lens group is a cemented lens with, from the object side, a first lens with a positive refractive power and a second lens with a negative refractive power. The second lens group includes a third lens with a positive refractive power and at least one aspherical surface. The third lens group includes a fourth lens with a positive refractive power and at least one aspherical surface. The present invention provides a thin photographing lens for mobile devices with cameras, which has a short total length and an exit angle up to around 20° and corrects various aberrations.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.