Imaging lens and image pickup device
US8184383B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Feb 13, 2009 |
| Grant date | May 22, 2012 |
| Priority date | — |
| Expiry date | Nov 20, 2029 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/34
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes in order from an object side, a stop and a first lens to a fourth lens. Both the surfaces of a third lens have surfaces including at least one inflection point, and an inclination of each surface at the terminal end part of a periphery within an effective diameter collapses toward the image side. And 0.1<D3/D4 <2.0, νd1−νd2>25, 0.4<f1/f3<1.6 and 0.3<f/f3<1.5 are satisfied, where D3 is an air space on an optical axis between the first lens and the second lens, D4 is a central thickness of the second lens, νd1 and νd2 are Abbe numbers of the first lens and the second lens, f1 and f3 are focal lengths of the first lens and the third lens and f is a focal length of an entire system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.