Optoelectronic monitoring device

US6815660B2 · kind B2 · utility

Assignee

• SICK AG · DE

Inventors

• Olaf Henkel · Meßkirch, DE
• Martin Wuestefeld · Waldkirch, DE

Key dates

• Filing date: Aug 15, 2002
• Grant date: Nov 9, 2004
• Expiry date: Sep 18, 2022

Classification

• Technology area (CPC F): Mechanical Engineering; Lighting; Heating
• CPC primary: F16P3/144
• WIPO field: Mechanical elements
• WIPO sector: Mechanical engineering

Abstract

The invention relates to an optoelectronic monitoring device for the detection of objects intruding into a monitored zone comprising at least one transmitter, in particular a light grid, arranged at an end of the monitored zone and having a group of transmission elements spaced apart from one another and each transmitting electromagnetic radiation into the monitored zone, at least one reflector arranged at an end of the monitored zone opposite the transmitter for radiation transmitted by the transmission elements, at least one receiver which has at least one spatially resolving reception element for radiation reflected by the reflector, and an evaluation device coupled with the reception element, wherein the transmitter, the reflector and the receiver are made and arranged such that, during the monitoring operation, at least a part of the group of transmission elements comprising a plurality of transmission elements is imaged on the reception element by means of the reflector and a check is made by means of the evaluation device as to whether a pattern on the reception element formed by the imaged transmission elements deviates from an expected image of the transmission elements. T…