Inverse telephoto with correction lenses
US7515351B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 28, 2007 |
| Grant date | Apr 7, 2009 |
| Priority date | — |
| Expiry date | Nov 28, 2027 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/04
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An inverse telephoto with correction lenses comprises five lens elements with refractive power, from the object side to the image side: a first lens element with negative refractive power having a concave image-side surface; a second lens element with positive refractive power having a convex image-side surface; a third lens element with a convex object-side surface; a fourth lens element with a concave image-side surface; a fifth lens element with positive refractive power having a convex image-side surface, at least one of an object-side surface and the image-side surface of the fifth lens element being aspheric; and an aperture stop located between the first lens element and the second lens element. At least three of the surfaces of the first, second, third, fourth and fifth lens elements are aspheric.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.