Surface acoustic wave code reader
US4210900A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 16, 1978 |
| Grant date | Jul 1, 1980 |
| Priority date | — |
| Expiry date | Aug 16, 1998 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06K19/0672
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A system is disclosed for reading a code established by a surface acoustic wave device. The system has a first antenna connected to a supply for transmitting a signal, a second antenna for receiving said signal and supplying it to a first transducer on a surface acoustic wave device, the first transducer converting the signal into surface acoustic waves, a second transducer on the surface acoustic wave device for converting the surface acoustic waves to a coded signal, a third antenna for transmitting the coded signal, and a fourth antenna for receiving the coded signal and connected to a receiver for providing an output dependent upon the coded signal. This system is particularly useful for access control systems.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.