Contrast sensor

US10726288B2 · kind B2 · utility

Assignee

• SICK AG · DE

Inventors

• Gunter Hirt · Steinach, DE
• Simone SCHWARZ · Waldkirch, DE
• Alexander Bierbaum · Karlsruhe, DE

Key dates

• Filing date: May 1, 2018
• Grant date: Jul 28, 2020
• Expiry date: Nov 8, 2038

Classification

• Technology area (CPC G): Physics
• CPC primary: G01J2001/446
• WIPO field: Measurement
• WIPO sector: Instruments

Abstract

A contrast sensor for evaluating identification markings and a method of evaluating identification markings on detecting objects using a contrast sensor, having at least one light transmitter and at least one light receiver, with the light receiver having a single photodiode; having a control and evaluation unit for evaluating the light receiver signal of the light receiver, and having an output for a sensor signal that is formed by the control and evaluation unit on the basis of the light receiver signal, wherein the identification marking has lettering or a marking; an elongate illumination field is projected by the light transmitter onto a region of the identification marking narrow in the direction of movement; and the control and evaluation unit compares a reception signal sequence having a plurality of contrast transitions with a stored reception signal sequence and outputs the sensor signal in dependence on the comparison.