Fixed-focus lens
US9261670B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 19, 2013 |
| Grant date | Feb 16, 2016 |
| Priority date | — |
| Expiry date | Dec 19, 2033 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A fixed-focus lens including a first lens group and a second lens group is provided. The first lens group having a negative refractive power includes a first lens, a second lens and a third lens arranged in sequence from an object side to an image side, in which refractive powers of the first, second and third lenses are negative, negative and positive in sequence. The second lens group having a positive refractive power is located between the first lens group and the image side, and the second lens group includes a fourth lens, a fifth lens and a sixth lens arranged in sequence from the object side to the image side, in which refractive powers of the fourth, fifth and sixth lenses are positive, negative and positive in sequence. The first, second, third, fourth, fifth and sixth lenses are separated from each other.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.