Back to results
US 5,729,057 AGranted
Vehicle antitheft device using transponder and having illuminated keyhole
AssigneeSiemens Aktiengesellschaft
InventorsHenryk Frenzel, Helmut Kraus
Life of this patent
Estimating the term…
Abstract
An anti-theft device for a motor vehicle includes a key having a transponder. A lock has a keyhole for receiving the key. An antenna is in the vicinity of the lock. A control unit for controlling the antenna sends starting signals to the transponder and receives answer signals from the transponder. An assembly is turned on or off if the answer signals correspond to set-point signals. The antenna has a lighting device being controlled by the control unit for illuminating a region around the keyhole, at least before the key is inserted.
Claims8
An anti-theft device for a motor vehicle, comprising:
- a key having a transponder;
- a lock having a keyhole for receiving said key;
- an antenna in the vicinity of said lock;
- a control unit for controlling said antenna to send starting signals to said transponder and to receive answer signals from said transponder;
- an assembly being turned on and off if the answer signals correspond to set-point signals;
- said antenna having a lighting device being controlled by said control unit for illuminating a region around said keyhole, at least before said key is inserted;
- and
- said antenna being formed as an annular coil having a photoconducting coil body wound with a plurality of windings, said photoconducting coil body being simultaneously part of said lighting device.
5 more elements
Dependencies are inferred from the claim text.