Imaging lens composed of seven optical elements
US9753258B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 25, 2015 |
| Grant date | Sep 5, 2017 |
| Priority date | — |
| Expiry date | Nov 25, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A compact low-profile imaging lens which offers a wide field of view and corrects aberrations properly. It includes: a first positive (refractive power) lens having a convex object-side surface as a first optical element; a second negative meniscus lens having a concave image-side surface as a second optical element; a third lens having at least one aspheric surface as a third optical element; a fourth lens having at least one aspheric surface as a fourth optical element; a fifth lens having at least one aspheric surface as a fifth optical element; and a sixth double-sided aspheric lens having a concave image-side surface as a sixth optical element. The aspheric image-side surface of the sixth lens has pole-change points off an optical axis. As a seventh optical element, one double-sided aspheric aberration correction optical element with virtually no refractive power is located between the first lens and an image plane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.