Lens device
US10781998B1 · kind B1 · utility
Assignee
Inventor
Key dates
| Filing date | Dec 17, 2019 |
| Grant date | Sep 22, 2020 |
| Priority date | — |
| Expiry date | Dec 17, 2039 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF21Y2115/10
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A lens device includes at least one optical lens which includes rear and front lens segments. The rear lens segment has a first refractive surface, a second refractive surface, and a reflective surface. The front lens segment has a convex lens front which defines a rear focal region. When light beams enter the optical lens through the second refractive surface and then are reflected by the reflective surface to form a plurality of reflected light beams, a plurality of second imaginary lines, extending rearwardly and respectively from the reflected light beams, converge at a second focal region overlapping with the rear focal region.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.