Patent ID: 8102269
Filing Date: 2012-01-24
Classification: G08G,H04B

Abstract:
1. Approach warning system for detecting when a person approaches an object, in particular a machine, which has a metal outer structure at least in regions, comprising at least a first near-field device which is associated with the object and a second near-field device which is associated with the person, wherein the first and the second near-field device form a transmission link for an electric near field, and a warning device which outputs an approach warning signal if the person with the second near-field device enters a detection region in which a transmission of the near field via the transmission link takes place, wherein the first near-field device, for the purpose of coupling to the near field, is connected firstly to at least one stray field electrode and secondly to the metal outer structure of the object, so that the outer structure forms a counter-electrode for the stray field electrode, and wherein the near-field devices and the electrodes thereof are configured so that the detection region at least approximately encloses the entire metal outer structure of the object.