Light barrier

Abstract

A light barrier (11, 41) with at least one light transmitter (21) for emitting infrared transmitting light beams (23) into a monitoring area (15), at least one light receiver (25) for receiving infrared receiving light beams (27) from the monitoring area (15), and a light transmission element (20, 55) made of a first material transparent to both visible and infrared light, arranged such that, during operation of the light barrier (11, 41), the infrared receiving light beams (27) pass through a receiving area (29) of the light transmission element (20, 55), wherein a layer (31) of a second material opaque to visible light and transparent to infrared light is printed onto the light transmission element (20, 55) such that the receiving area (29) is completely shielded from the printed layer (31). is covered with a second material.