Imaging lens and imaging apparatus using imaging lens
US7903349B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 16, 2009 |
| Grant date | Mar 8, 2011 |
| Priority date | — |
| Expiry date | Oct 16, 2029 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA61P31/14
- WIPO fieldPharmaceuticals
- WIPO sectorChemistry
Abstract
An imaging lens includes, in order from an object side, a first lens group having a positive power, an aperture diaphragm, and a second lens group having a positive or negative power. The first lens group includes, in order from the object side, a first lens which is a biconcave lens, a second lens that has a positive power and includes a convex image-side surface, and a third lens that has a positive power and includes a convex object-side surface. The second lens group includes, in order from the object side, a fourth lens that has a negative power and includes a concave image-side surface, and a fifth lens which is a biconvex lens. Each of the first to fifth lenses is a single spherical glass lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.