Wide-angle lens and imaging device
US9019342B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 23, 2012 |
| Grant date | Apr 28, 2015 |
| Priority date | — |
| Expiry date | Jul 23, 2032 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N23/698
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A wide-angle lens having a field angle larger than 180 degrees includes, in order from an object side to an image side, a front group, a reflection surface, and a back group, wherein the front group includes three lenses having a negative refractive power, the reflection surface is configured to curve an optical axis of the front group at 90 degrees toward the back group, the back group includes four lenses having a positive refractive power, a front principle point is set between a second lens and a third lens from the object side in the front group, and a focal length of an entire system f and a distance between an intersection of the reflection surface and the optical axis of the front group and the front principle point d satisfy the following condition (1) 7.0<d/f<9.0.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.