Optical device for concentrating the light radiation emitted by a light emitting diode, and a light emitting diode comprising a device of this nature
US4703219A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 1, 1984 |
| Grant date | Oct 27, 1987 |
| Priority date | — |
| Expiry date | Nov 1, 2004 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10H20/855
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A device for optically coupling a light emitting diode and a radiation pickup such as an optical fiber. The light emitting diode element includes at least one emissive section within an active layer where a part of the light irradiation does not emerge from the diode element if it is emitted at an excessive angle of incidence. A lenticular element in the form of either a semi-cylindrical lens or a semi-toroidal lens is associated with the emissive section. In one form, the device includes a circular central lens and a plurality of semi-toroidal lens concentric with respect to the central lens and associated with annular emissive sections.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.