Imaging lens
US10191248B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 11, 2015 |
| Grant date | Jan 29, 2019 |
| Priority date | — |
| Expiry date | Nov 24, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B13/18
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact low-profile low-cost imaging lens with a small F-value which offers a wide field of view and corrects aberrations properly. Its elements are spaced from each other and arranged from an object side to an image side as follows: a first positive lens having a convex object-side surface; a second negative lens; a third positive or negative lens; a fourth positive or negative lens; a fifth positive or negative lens; a sixth positive or negative lens; and a seventh lens as a double-sided aspheric lens having a concave image-side surface. The third to sixth lenses each have at least one aspheric surface. The aspheric image-side surface of the seventh lens has a pole-change point off an optical axis. The imaging lens satisfies a conditional expression −1.0<f1/f2<−0.15, where f1 denotes focal length of the first lens, and f2 denotes focal length of the second lens.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.