LIGHTING DEVICE FOR AN OPTOELECTRONIC SENSOR FOR DETECTING OBJECTS IN A MONITORING AREA AND OPTOELECTRONIC SENSOR

The lighting device uses a diffuser arrangement with a curved effective zone to compensate for optical distortion, ensuring accurate projection of light lines onto the light receiver, thereby improving detection sensitivity and completeness.

DE102024100400B4Active Publication Date: 2026-06-18SICK AG
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Patent Information

Authority / Receiving Office
DE · DE
Patent Type
Patents
Current Assignee / Owner
SICK AG
Filing Date
2024-01-09
Publication Date
2026-06-18

AI Technical Summary

Technical Problem

Conventional lighting devices for optoelectronic sensors generate a transmitted light pattern that cannot be accurately mapped onto a light receiver due to optical distortion caused by the receiving optics, leading to incomplete detection and reduced sensitivity, especially at the edges.

Method used

The lighting device incorporates a diffuser arrangement with a curved effective zone that distorts the transmitted light pattern to compensate for distortion caused by the receiving optics, ensuring the light lines are projected as straight lines onto the light receiver.

Benefits of technology

The solution enables accurate mapping of the transmitted light pattern onto the light receiver, enhancing detection sensitivity and preventing undesired reduction in sensitivity, particularly in peripheral areas.

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Abstract

Lighting device (200, 300, 400, 500) for an optoelectronic sensor, which is set up to detect objects in a monitored area, with a light transmitter arrangement which is designed to emit transmitted light into the monitoring area and includes at least one light source (10), with a transmitting optics arrangement comprising at least one transmitting optic (12) and configured to focus the transmitted light, and with a diffuser arrangement comprising at least one linear diffuser (16) and configured to scatter the focused transmitted light in a first spatial direction (X) and to leave it at least substantially unscattered in a second spatial direction (Y) orthogonal to the first spatial direction, wherein the light transmitter arrangement, the transmitting optics arrangement and the diffuser arrangement are configured to produce a striped transmitted light pattern on an object present in the monitored area, which comprises several light lines, characterized by that an effective zone of the diffuser arrangement has a curvature which is designed in such a way that a reference transmitted light pattern, which would comprise straight lines of light in the angular space if generated by means of a reference diffuser arrangement with a planar effective zone, is distorted in such a way that the lines of light in the angular space have a curved, distorted course.
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