Picture-taking lens, image pick-up unit and hand-held device
US7486328B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Oct 27, 2005 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Jul 26, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B9/12
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A picture-taking lens for forming an image of an object image on a solid picture-taking element, comprising in order from the object side: a first lens having a positive refractive power and directing a convex surface toward the object side; an aperture stop, a second lens having a positive refractive power and a meniscus shape directing a convex surface toward the image side; and a third lens having a negative refractive power and directing a concave surface toward the image side, wherein the picture-taking lens satisfies the following conditional expression: 0.20<R1/f<0.42, 0.10<D2/f<0.40, where R1 is a radius of curvature of the object side surface of the first lens, D2 is an air gap on the axis between the first lens and the second lens, f is a focal length of a whole system of the picture-taking lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.