Aspherical lens for concentrating diffuse optical radiation
US4534614A · kind A · utility
10Cited by
8References
4Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jul 1, 1980 |
| Grant date | Aug 13, 1985 |
| Priority date | — |
| Expiry date | Jul 1, 2000 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04M1/71
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Optical signal detection apparatus suitable for use in diffuse infrared light wave communication comprises an aspherical lens in combination with a photodetector. The lens comprises a body of light transparent material having a planar back surface and an aspherical front surface. The front surface is of a shape approximating a hyperboloid. A light transparent, electrically conductive coating is applied to the planar back surface of the lens, and an optical filter is disposed between the lens and the photodetector.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.