DE102008000503A1 - Method for verifying data-matrix-code of image on workpiece for use in quality assurance field, involves reading data-matrix-code of image field using camera, and verifying red data-matrix-code by comparing with reference code - Google Patents

Method for verifying data-matrix-code of image on workpiece for use in quality assurance field, involves reading data-matrix-code of image field using camera, and verifying red data-matrix-code by comparing with reference code Download PDF

Info

Publication number
DE102008000503A1
DE102008000503A1 DE200810000503 DE102008000503A DE102008000503A1 DE 102008000503 A1 DE102008000503 A1 DE 102008000503A1 DE 200810000503 DE200810000503 DE 200810000503 DE 102008000503 A DE102008000503 A DE 102008000503A DE 102008000503 A1 DE102008000503 A1 DE 102008000503A1
Authority
DE
Germany
Prior art keywords
code
matrix
data
verifying
camera
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
DE200810000503
Other languages
German (de)
Inventor
Gert Dr. Teschauer
Steffen Krause
Matthias Weissbeck
Roman Grusser
Sebastian Uhlig
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
GORDON VERWALTUNG GMBH, 09114 CHEMNITZ, DE
Original Assignee
DR TESCHAUER AG
TESCHAUER AG DR
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by DR TESCHAUER AG, TESCHAUER AG DR filed Critical DR TESCHAUER AG
Priority to DE200810000503 priority Critical patent/DE102008000503A1/en
Publication of DE102008000503A1 publication Critical patent/DE102008000503A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10712—Fixed beam scanning
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K1/00—Methods or arrangements for marking the record carrier in digital fashion
    • G06K1/12—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching
    • G06K1/126—Methods or arrangements for marking the record carrier in digital fashion otherwise than by punching by photographic or thermographic registration
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K5/00—Methods or arrangements for verifying the correctness of markings on a record carrier; Column detection devices

Abstract

The method involves reading a data-matrix-code of an image field using a camera (3) arranged in an optical path of a laser marking system after producing the data-matrix-code on a workpiece (5) by the laser marking. The data-matrix-code is illuminated using an infrared light while reading the data-matrix-code. The red data-matrix-code of the image field is verified by comparing with a reference code, where the image field depends on a ratio of a focal length of a camera objective to a focal length of a camera adapter (2).

Description

Die Erfindung betrifft das Gebiet der Qualitätssicherung in technologischen Prozessen. Zu diesem Zweck werden Werkstücke beispielsweise nach einem ausgewählten Bearbeitungsvorgang mit einem Kennzeichen versehen, welches das Werkstück anhand codierter Parameter eindeutig und dauerhaft identifizierbar macht.The Invention relates to the field of quality assurance in technological Processes. For this purpose, workpieces, for example, after a chosen Machining process provided with a label, which is the Workpiece based encoded parameter clearly and permanently identifiable.

In letzter Zeit hat sich als geeignetes Kennzeichen der so genannte Data-Matrix-Code als Standard durchgesetzt. Die Komplexität des Codes und die daraus folgende ausschließlich maschinell mögliche Lesbarkeit erfordert indes die Verifizierung des geschriebenen Codes, bevor das Werkstück in den weiteren technologischen Prozess entlassen wird. Es ist bekannt, zur Verifizierung von Data-Matrix-Codes das Werkstück aus der Beschriftungseinrichtung zu entnehmen und einer Auswerteeinheit zuzuführen. Dieser Schritt aber verlängert die Zykluszeit in der Fertigung. Zudem besteht die Gefahr, dass allein wegen fehlerhafter Kennzeichnung Werkstücke als Ausschuss aussortiert werden.In Lately, the so-called Data matrix code enforced as standard. The complexity of the code and the resulting readability that can only be read by machine however, requires the verification of the written code before the workpiece is released in the further technological process. It is known, for verification of data matrix codes the workpiece from the To remove labeling device and an evaluation supply. This Step but extended the cycle time in production. There is also a risk that only because of incorrect marking workpieces rejected as rejects become.

Hieraus ergibt sich die Aufgabe der Erfindung, Fertigungszyklen durch Verringerung des Zeitaufwandes zur Verifizierung von Kennzeichnungen zu verkürzen.From this results in the object of the invention, manufacturing cycles by reducing the time required to verify labels.

Die Erfindung löst diese Aufgabe mit einem Verfahren gemäß Patentanspruch 1, indem auf Werkstücken durch Laserbeschriftung erzeugter Data-Matrix-Code nach dem Aufbringen mittels einer im Strahlengang des Laserbeschriftungssystems angeordneten Kamera gelesen und der gelesene Data-Matrix-Code durch Vergleich mit dem Soll-Code verifiziert wird.The Invention solves This object with a method according to claim 1, by working on workpieces Laser marking generated data matrix code after application arranged by means of a in the beam path of the laser marking system Camera read and the read data matrix code by comparison is verified with the target code.

Die Unteransprüche zeigen vorteilhafte Ausgestaltungen und Weiterbildungen des erfindungsgemäßen Verfahrens auf. Danach ist während des Lesens des Data-Matrix-Codes das Bildfeld beleuchtet, um die Erkennbarkeit des Codes zu verbessern oder eine möglichst einfache Kamera verwenden zu können. Vorteilhaft ist die Beleuchtung des Bildfeldes durch infrarotes Licht, um Verzerrungen bei der Aufnahme zu vermeiden. Es hat sich gezeigt, dass eine optimale Beleuchtung des Bildfeldes zum Lesen von Data-Matrix-Code mit zwei Quellen in einem Beleuchtungswinkel von jeweils etwa 45° zum Werkstück erfolgt. Die Größe des Bildfeldes ergibt sich aus der Größe des Aufnahmesensors und dem Verhältnis der Brennweite des Kameraobjektivs zur Brennweite eines Kameraadapters, der im Strahlengang der Laserbeschriftungseinrichtung angeordnet und mit dem die Kamera verbunden ist. In der Folge der Verifizierung kann anhand des Ergebnisses der Prüfung das Werkstück im technologischen Prozess weitergeleitet oder einer Wiederholung von Beschriftung und Verifizierung der Beschriftung zugeführt werden. Damit wird ausgeschlossen, dass Werkstücke allein wegen fehlerhafter Kennzeichnung als Ausschuss aussortiert werden.The under claims show advantageous embodiments and further developments of the method according to the invention on. After that is during reading the data matrix code illuminates the image field to the Recognizability of the code to improve or as possible easy to use camera. Advantageously, the illumination of the image field by infrared Light to avoid distortion during recording. It has shown that optimal illumination of the image field for reading of data matrix code with two sources in one illumination angle each about 45 ° to workpiece he follows. The size of the image field results from the size of the recording sensor and the ratio of Focal length of the camera lens to the focal length of a camera adapter, which is arranged in the beam path of the laser marking device and to which the camera is connected. In the consequence of the verification can on the basis of the result of testing the workpiece in technological Process forwarded or a repeat of caption and verification of the label. This excludes that workpieces sorted out as scrap due to incorrect labeling alone become.

Nachfolgend wird ein bevorzugtes Ausführungsbeispiel der Erfindung anhand der Zeichnung einer zur Durchführung des erfindungsgemäßen Verfahrens verwendeten Anordnung näher erläutert. Die Zeichnung zeigt ein Blockschaltbild einer Anordnung zur Durchführung des erfindungsgemäßen Verfahrens.following becomes a preferred embodiment the invention with reference to the drawing one for carrying out the inventive method used arrangement closer explained. The drawing shows a block diagram of an arrangement for carrying out the inventive method.

Der von einer Strahlquelle 1 ausgehende Beschriftungsstrahl durchläuft zunächst einen an die Strahlquelle 1 angeflanschten Strahlteiler 2, bevor die Strahlablenkung mittels einer Scaneinrichtung 4 zur Beschriftung eines auf einem Werkstückträger 6 angeordneten Werkstücks 5 vorgenommen wird. Das Bildfeld des auf dem Werkstück 5 aufgebrachten Data-Matrix-Codes, oder jeder anderen Beschriftung, wird anschließend mit IR-Licht beleuchtet, das von in einem Winkel von jeweils 45° zur Werkstückebene angeordneten Beleuchtungseinrichtungen 7 abgegeben wird. Dadurch kann die Abbildung des Data-Matrix-Codes über die Scaneinrichtung 4 und den Strahlteiler 2 zu einer Kamera 3 übertragen werden. Zur Steuerung sind Strahlquelle 1, Kamera 3, Scaneinrichtung 4 und Beleuchtungseinrichtungen 7 mit einem Steuerrechner 8 verbunden, der auch zur Speicherung und Wiedergabe der Data-Matrix-Code-Abbildungen dient. Die Abbildung des Data-Matrix-Codes erscheint zunächst spiegelbildlich, so dass eine zusätzliche Spiegelung vorgenommen werden muss. Diese Spiegelung kann vorteilhaft durch die Steuersoftware durch spiegelbildliche Speicherung entweder des zum Vergleich dienenden Soll-Codes oder der Abbildung erfolgen. Die Größe des auswertbaren Bildfeldes und damit die Größe und/oder Anzahl der auswertbaren Data-Matrix-Codes richtet sich im Wesentlichen nach der Größe des Aufnahmesensors und dem Verhältnis der Brennweiten des verwendeten Kameraobjektivs und des strahlteilenden Kameraadapters 2.The one from a beam source 1 outgoing label beam first passes through one to the beam source 1 Flanged beam splitter 2 before the beam deflection by means of a scanning device 4 for labeling one on a workpiece carrier 6 arranged workpiece 5 is made. The image field of the on the workpiece 5 applied data matrix codes, or any other label, is then illuminated with IR light, arranged by at an angle of 45 ° to the workpiece plane lighting devices 7 is delivered. This allows the mapping of the data matrix code through the scanning device 4 and the beam splitter 2 to a camera 3 be transmitted. To control are beam source 1 , Camera 3 , Scanning device 4 and lighting equipment 7 with a control computer 8th which also serves to store and playback the data matrix code mappings. The image of the data matrix code initially appears in mirror image, so that an additional mirroring must be made. This mirroring can advantageously be carried out by the control software by mirror-image storage of either the reference code used for comparison or the image. The size of the evaluatable image field and thus the size and / or number of evaluable data matrix codes depends essentially on the size of the recording sensor and the ratio of the focal lengths of the camera lens used and the beam splitting camera adapter 2 ,

Claims (6)

Verfahren zum Verifizieren von auf Werkstücken durch Laserbeschriftung erzeugtem Data-Matrix-Code, dadurch gekennzeichnet, dass nach dem Aufbringen des Data-Matrix-Codes der Data-Matrix-Code mittels einer im Strahlengang des Laserbeschriftungssystems angeordneten Kamera gelesen und der gelesene Data-Matrix-Code durch Vergleich mit dem Soll-Code verifiziert wird.Method for verifying data matrix code generated on workpieces by laser inscription, characterized in that after application of the data matrix code the data matrix code is read by means of a camera arranged in the beam path of the laser marking system and the read data matrix code Code is verified by comparison with the target code. Verfahren nach Anspruch 1, dadurch gekennzeichnet, dass während des Lesens des Data-Matrix-Codes das Bildfeld beleuchtet ist.Method according to claim 1, characterized in that that while of reading the data matrix code the image field is illuminated. Verfahren nach Anspruch 2, dadurch gekennzeichnet, dass zur Beleuchtung des Bildfeldes infrarotes Licht verwendet wird.Method according to claim 2, characterized in that that infrared light is used to illuminate the image field. Verfahren nach Anspruch 3, dadurch gekennzeichnet, dass zur Beleuchtung des Bildfeldes zwei Quellen in einem Beleuchtungswinkel von jeweils etwa 45° zum Werkstück verwendet werden.Method according to claim 3, characterized that for illumination of the image field two sources in an illumination angle each about 45 ° to workpiece be used. Verfahren nach Anspruch 1, 2, 3 oder 4, dadurch gekennzeichnet, dass das Bildfeld vom Verhältnis der Brennweite des Kameraobjektivs zur Brennweite eines Kameraadapters abhängig ist.Method according to claim 1, 2, 3 or 4, characterized that the image field of the ratio the focal length of the camera lens to the focal length of a camera adapter dependent is. Verfahren nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass anhand des Ergebnisses der Prüfung das Werkstück im technologischen Prozess weitergeleitet wird oder eine Wiederholung von Beschriftung und Verifizierung der Beschriftung erfolgt.Method according to one of the preceding claims, characterized characterized in that based on the result of the test the workpiece in the technological process is forwarded or a repetition Labeling and verification of the label is done.
DE200810000503 2008-03-04 2008-03-04 Method for verifying data-matrix-code of image on workpiece for use in quality assurance field, involves reading data-matrix-code of image field using camera, and verifying red data-matrix-code by comparing with reference code Withdrawn DE102008000503A1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
DE200810000503 DE102008000503A1 (en) 2008-03-04 2008-03-04 Method for verifying data-matrix-code of image on workpiece for use in quality assurance field, involves reading data-matrix-code of image field using camera, and verifying red data-matrix-code by comparing with reference code

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE200810000503 DE102008000503A1 (en) 2008-03-04 2008-03-04 Method for verifying data-matrix-code of image on workpiece for use in quality assurance field, involves reading data-matrix-code of image field using camera, and verifying red data-matrix-code by comparing with reference code

Publications (1)

Publication Number Publication Date
DE102008000503A1 true DE102008000503A1 (en) 2009-09-10

Family

ID=40935945

Family Applications (1)

Application Number Title Priority Date Filing Date
DE200810000503 Withdrawn DE102008000503A1 (en) 2008-03-04 2008-03-04 Method for verifying data-matrix-code of image on workpiece for use in quality assurance field, involves reading data-matrix-code of image field using camera, and verifying red data-matrix-code by comparing with reference code

Country Status (1)

Country Link
DE (1) DE102008000503A1 (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011083252B3 (en) * 2011-09-23 2012-12-13 Schaeffler Technologies AG & Co. KG Hand-held labeling system
DE102011083250A1 (en) 2011-09-23 2013-03-28 Schaeffler Technologies AG & Co. KG Laser system, useful to label workpiece, comprises a label laser for applying mark on surface of workpiece, a camera, an illumination device, and a closed housing, where a security initiator is attached at an exterior wall of housing
DE102011083251A1 (en) 2011-09-23 2013-03-28 Schaeffler Technologies AG & Co. KG Device for evaluating two-dimensional data-matrix-code formed on sharpened large bearing of wind power station by marking laser, has pivotable mirror pivoted such that light of illuminating device reaches into camera optical path to camera
WO2021094476A1 (en) * 2019-11-13 2021-05-20 Trumpf Schweiz Ag Hand-held unit comprising a marking laser and a marking reader

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102011083252B3 (en) * 2011-09-23 2012-12-13 Schaeffler Technologies AG & Co. KG Hand-held labeling system
DE102011083252B9 (en) * 2011-09-23 2013-01-03 Schaeffler Technologies AG & Co. KG Hand-held labeling system
DE102011083250A1 (en) 2011-09-23 2013-03-28 Schaeffler Technologies AG & Co. KG Laser system, useful to label workpiece, comprises a label laser for applying mark on surface of workpiece, a camera, an illumination device, and a closed housing, where a security initiator is attached at an exterior wall of housing
DE102011083251A1 (en) 2011-09-23 2013-03-28 Schaeffler Technologies AG & Co. KG Device for evaluating two-dimensional data-matrix-code formed on sharpened large bearing of wind power station by marking laser, has pivotable mirror pivoted such that light of illuminating device reaches into camera optical path to camera
WO2013041253A1 (en) 2011-09-23 2013-03-28 Schaeffler Technologies AG & Co. KG Hand-guided marking system
DE102011083251B4 (en) * 2011-09-23 2014-07-24 Schaeffler Technologies Gmbh & Co. Kg Device for evaluating the labeling made on a workpiece with a marking laser
US9427826B2 (en) 2011-09-23 2016-08-30 Schaeffler Technologies AG & Co. KG Hand-guided marking system
WO2021094476A1 (en) * 2019-11-13 2021-05-20 Trumpf Schweiz Ag Hand-held unit comprising a marking laser and a marking reader
DE102019217506A1 (en) * 2019-11-13 2021-05-20 Trumpf Schweiz Ag Hand-held device with a marking laser and a marking reading device

Similar Documents

Publication Publication Date Title
DE102018211212A1 (en) Machine Learning Device, Tester and Machine Learning Method
EP2024127B1 (en) Device for evaluating images of weld spots on a carrier material
EP2061621B1 (en) Method and device for the optical assessment of welding quality during welding
WO2016001234A1 (en) Method and device for determining a material type and/or surface characteristics of a workpiece
DE10254917A1 (en) Method and device for the simultaneous block melting of material by means of a laser
EP2118641A2 (en) Method and apparatus for the examination of an object
EP3410091B1 (en) Method for detecting a modulation transfer function and a centring system of an optical system
DE102008000503A1 (en) Method for verifying data-matrix-code of image on workpiece for use in quality assurance field, involves reading data-matrix-code of image field using camera, and verifying red data-matrix-code by comparing with reference code
EP2897758A2 (en) Device for position control of a laser machining beam
EP3008455B1 (en) Detection system for detecting a soldered joint
DE102011118611A1 (en) Apparatus and method for a semi-automatic testing station
DE102007054657A1 (en) Visualization and/or examination arrangement for e.g. glass bottle, has reflector system providing images of sample from different directions, where images are subjectable to image analysis and/or image comparison in image evaluation device
DE102011083252B3 (en) Hand-held labeling system
DE10234002B4 (en) Method for marking glass
DE10153943B4 (en) Laser marker and method for applying a matrix code to an article
DE102016214990B4 (en) Optical system, surgical instrument, and method and apparatus for assembling an optical system
CN111709918B (en) Product defect classification method combining multiple channels based on deep learning
DE102012111650B4 (en) Method and device for determining three-dimensional raised structures on a surface of a document
DE102017128032A1 (en) Code reader and method for online verification of a code
DE10042537B4 (en) Method for checking a surface for defective areas
EP0304943A2 (en) Device for marking faults on printed circuit boards
DE102020122924A1 (en) Method for analyzing a workpiece surface for a laser machining process and an analysis device for analyzing a workpiece surface
DE19646990A1 (en) Marking of compressed gas bottles
DE10261865A1 (en) Method, device and computer program for optical surface detection
EP0778564A1 (en) Apparatus for exposing a circular disk-shaped substrate

Legal Events

Date Code Title Description
8127 New person/name/address of the applicant

Owner name: GORDON VERWALTUNG GMBH, 09114 CHEMNITZ, DE

R119 Application deemed withdrawn, or ip right lapsed, due to non-payment of renewal fee

Effective date: 20131001