Passive light-based data communication
US9373019B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Aug 14, 2014 |
| Grant date | Jun 21, 2016 |
| Priority date | — |
| Expiry date | Aug 14, 2034 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/06065
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
Techniques are disclosed for light-based communication using a passive light-reflective device having specially coded reflective or printed optics. The optics can be mounted to an object and configured to reflect light such that a receiver is able to receive the reflected light. The optics are further configured to alternatively display a number of different patterns that change as the receiver moves with respect to the optics, thus causing the receiver to receive an apparent stream of modulated light, which represents coded information that can be decoded into meaningful information. The optics can be mounted to a traffic control or other roadside device. As a vehicle approaches and passes the traffic control device, light reflects off of the optics in a series of patterns. This reflected light can be received by the vehicle and processed to relay the information to the operator or on-board vehicle system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.