Remote control apparatus with selectable RF and optical signal transmission
US4904993A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 9, 1987 |
| Grant date | Feb 27, 1990 |
| Priority date | — |
| Expiry date | Feb 9, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG08C2201/63
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A communication apparatus for a remote control apparatus, for example, in order to lock or unlock doors or a trunk of a vehicle selects a radio signal or optical signal in accordance with the conditions between the transmitter and receiver. Its transmitter is provided with a radio signal sending circuit, an optical signal sending circuit and a selection circuit which selects any one circuit for operation and a receiver which is provided with a radio signal receiving circuit which receives a radio signal transmitted from said radio signal sending circuit and an optical signal receiving circuit which receives an optical signal transmitted from said optical signal sending circuit.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.