Wide-conversion lens
US8456765B1 · kind B1 · utility
Assignees
Inventors
Key dates
| Filing date | Apr 24, 2012 |
| Grant date | Jun 4, 2013 |
| Priority date | — |
| Expiry date | Apr 24, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/60
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A wide-conversion lens, in order from the object-side to the image-side, includes a first lens with negative refraction power, a second lens with negative refraction power, a third lens with positive refraction power, a fourth lens with positive refraction power, and a fifth lens with negative refraction power. The first lens includes a surface facing the object side. The wide-conversion lens satisfies the following conditions: R1<0; Vd−Vd1≧19; Vd2−Vd3≧35. Wherein, R1 is the curvature radius of the surface of the first lens; Vd1 is the Abbe number of the first lens; Vd2 is the Abbe number of the second lens; Vd3 is the Abbe number of the third lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.