Photographic lens optical system
US9488806B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 11, 2014 |
| Grant date | Nov 8, 2016 |
| Priority date | — |
| Expiry date | Feb 16, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/62
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A photographic lens optical system includes: a first lens having a positive refractive power and a meniscus shape convex toward an object side; a second lens having a negative refractive power and a meniscus shape convex toward the object side; a doublet lens having a positive refractive power and formed by combining a third lens and a fourth lens; a fifth lens having a positive refractive power and a double convex shape; and a sixth lens having a positive refractive power and a double convex shape. The first to sixth lenses are sequentially arranged in a direction from the object side to an image side, and the photographic lens optical system satisfies the following condition:1.5<Nd2<1.7
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.