Photographic lens optical system
US8773772B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 17, 2012 |
| Grant date | Jul 8, 2014 |
| Priority date | — |
| Expiry date | Aug 25, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B5/208
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens optical system includes first, second, third, and fourth lenses that are arranged between an object and an image sensor, in order from an object side, wherein the first lens has positive refractive power and an incident surface that is convex toward the object, the second lens has negative refractive power and both surfaces of which are concave, the third lens has positive refractive power and a meniscus shape that is convex toward the image sensor, and the fourth lens has negative refractive power and at least one of an incident surface and an exit surface of which is an aspherical surface, wherein the system satisfies the inequality,3.0<TTL/BL<3.4,
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.