Photographic lens optical system
US8736985B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 29, 2011 |
| Grant date | May 27, 2014 |
| Priority date | — |
| Expiry date | Nov 18, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A lens optical system includes first to fourth lenses that are sequentially arranged from an object, and which are between the object and an image sensor on which an image of the object is formed. The first lens has a positive refractive power and an incident surface that is convex toward the object. The second lens has a negative refractive power and both surfaces that are concave. The third lens has a positive refractive power and has a meniscus shape that is convex toward the image sensor. The fourth lens has a negative refractive power and at least one of an incident surface and an exit surface thereof is an aspherical surface. The lens optical system may satisfy an inequality that 0.5<|tan θ|/f<1.5, where “θ” denotes an angle of view of the lens optical system and “f” denotes a focal length of the lens optical system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.