Imaging lens
US8792187B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jan 25, 2011 |
| Grant date | Jul 29, 2014 |
| Priority date | — |
| Expiry date | Aug 12, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An imaging lens includes plastic-made first, second, third, and fourth lens elements arranged in the given order from an object side to an imaging side. The first lens element has a positive focusing power and is biconvex. The second lens element has a negative focusing power, is biconcave, and has an abbe number not greater than 30. The third lens element has a positive focusing power and has a convex imaging-side surface facing toward the imaging side. The fourth lens element has an imaging-side surface formed with a concave area in a vicinity of an optical axis of the fourth lens element. The imaging lens further includes an aperture stop disposed between the first and second lens elements.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.