Patent ID: 7176444
Filing Date: 2007-02-13
Classification: B21D,F16P,G01V

Abstract:
1. A light barrier having a light emitter spaced apart from a light receiver, the emitter including a light source and transmission optics and emitting a substantially parallel light beam, the light receiver and the light emitter being arranged to be aligned with each other for focusing the light beam from the light emitter by means of reception optics on a reception element for generating an electrical signal as a function of the light received, characterized by having a partially reflecting optical boundary surface between the reception optics and the reception element, and an alignment plate including a light entry opening and a target disk formed to be positioned in front of the reception optics for aligning the light receiver and the light emitter, wherein the light entry opening in the alignment plate is offset relative to an optical axis of the reception optics.