Optical communications link
US4054794A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 12, 1975 |
| Grant date | Oct 18, 1977 |
| Priority date | — |
| Expiry date | Mar 12, 1995 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04N7/22
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
The specification discloses a wireless optical communications link which includes a transmitter housing having circuitry for receiving electrical audio and video signals. A light emitting diode is mounted in the transmitter housing for generating a directional beam of light. Circuitry modulates the beam of light in accordance with the audio and video signals. A receiver housing is adapted to be located remote from the transmitter housing and includes an aspheric Fresnel lens for receiving and focusing the beam of light. A photodiode is mounted in the receiver housing for generating electrical output signals in response to the received beam of light. Circuitry is responsive to the electrical output signals for reconstructing the audio and video signals at the remote location.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.