Optical lens assembly
US9857557B1 · kind B1 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 18, 2016 |
| Grant date | Jan 2, 2018 |
| Priority date | — |
| Expiry date | Jul 18, 2036 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B27/0025
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical lens assembly includes a first lens element, a second lens element, a third lens element, and a fourth lens element from an object side to an image side in order along an optical axis. The first lens element to the fourth lens element each include an object-side surface facing the object side and allowing imaging rays to pass through and an image-side surface facing the image side and allowing the imaging rays to pass through. The object-side surface of the first lens element has a convex portion in a vicinity of the optical axis. The second lens element has positive refracting power, and the object-side surface of the second lens element has a concave portion in a vicinity of a periphery of the second lens element. The third lens element is made of glass having an Abbe number greater than 60.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.