Patent ID: 7378641
Filing Date: 2008-05-27
Classification: G01V

Abstract:
1. A device for identifying an object in or on a closable opening, comprising a device for opening and closing the opening by means of a movable part and an optoelectronic detection mechanism for identifying the object, which feeds light into at least one first light guide and at least one second light guide by means of at least one light source and detects changes in the received light by means of at least one receiver, wherein each of the first light guide and the second light guide has a means for emitting light transversely to its longitudinal extent and a means for receiving light transversely to its longitudinal extent, while being in operative connection with the at least one receiver, wherein the first and second light guides are arranged at the edge of the opening in such a way that a bidirectional light field is produced between them which at least partially bridges the opening, wherein a clock circuit is provided, which feeds light in an alternating manner into the first and second light guides, which light is received by the at least one receiver, and wherein a comparison means is provided for comparing the signals present at the at least one receiver to identify the object.