DE102008054801A1 - Irradiation device and method for irradiating an object - Google Patents

Abstract

An irradiation device 1 with a working radiation source 3, which is designed to irradiate an object 2 with a working radiation 5, with a deflection device 6, which is designed and / or arranged as an active beam guiding and / or shaping device for the working radiation 5, with a measuring radiation source 4, which is designed to output a measuring radiation 12 which is at least temporarily directed and / or directionable on the object, and with a receiving device 13, which is designed to receive the measuring radiation (12) reflected by the object, wherein the measuring radiation 12 is guided via the deflecting device (6) and / or is.

Description

State of the art

The The invention relates to an irradiation device with a working radiation source, which for irradiating an object with a working radiation is formed, with a deflection, which as an active beam guidance and / or shaping device for the working radiation is formed and / or arranged with a Measuring radiation source, which is designed to output a measuring radiation is that at least temporarily directed to the object and / or directable is, and with a receiving device, which for receiving the of the Object discarded Measuring radiation is formed. The invention also relates to a method for Irradiation of an object.

Irradiation equipment which cause radiation to an object are in various embodiments and scales known. Thus, irradiation devices are needed to scanning a laser beam over a label in the case of barcode lasers. irradiation devices but are also used to, for example, an actor on a stage to selectively illuminate. Further fields of application of irradiation devices lie in material processing, with a laser beam for material modification on a workpiece directed and moved on this. The control of the irradiation device occurs in some applications according to a fixed scheme, such. B. when scanning a barcode label, in other applications be measuring methods for detecting the object to be irradiated, wherein the radiation of the irradiation device in dependence the detected object is positioned or controlled.

Disclosure of the invention

in the The invention provides an irradiation device with the features of claim 1 and a method for irradiating an object with the features of claim 11 proposed. Preferred or advantageous embodiments The invention will become apparent from the dependent claims, the following description and the attached Characters.

It an irradiation device is presented as invention, which a working radiation source, which is used for the irradiation of a Object is designed with a working radiation. In the most general shaping the invention, the working radiation of any wavelength, a any wavelength range, any intensity or energy and thus any type of particular be optical radiation. Preferably, the working radiation formed as a directed radiation.

The Irradiation device comprises a deflection device, wherein the Deflection device as an active Strahlführungs- and / or -formseinrichtung for the Working radiation trained and / or in the irradiation device is arranged accordingly. By the expression as active unit is the deflection device, in particular via control and / or control signals controllable and / or adjustable designed to the beam path of the To change work radiation. The deflection device can on the one hand the beam guide, ie in particular the Beam direction, change, alternatively or in addition the deflection device can form the working radiation, wherein the Forming in particular on the intensity and / or on the phase of Working radiation can act.

When further component, the irradiation device comprises a measuring radiation source, which allows the output of a particular optical measuring radiation, the at least temporarily directed to the object and / or directable is. By measuring radiation can, especially under certain Operating conditions, the object can be measured.

For the reception the one who is thrown back by the object, in particular reflected measuring radiation, shows the irradiation device a receiving device, which optionally an evaluation device which is the one thrown back and received Measuring radiation evaluates.

in the According to the invention, it is proposed that the measuring radiation be transmitted via the Deflection guided is and / or is. Thus, the irradiation device is formed, the working radiation and the measuring radiation simultaneously and / or one after the other the common deflection device and in particular via common To guide deflecting the deflector. Preferably, the thrown back and received measuring radiation also guided over the deflector.

The Irradiation device according to the invention has the advantage that the deflection device both for the working radiation as well as for the measuring radiation can be used. This initially results in a Reduction of the number of optical elements for the deflection of the Radiation, since the existing elements are used twice. Another advantage is given by the fact that the work radiation and the measuring radiation - so far both are activated - optical / mechanical synchronized with each other and thus always be distracted together.

at A preferred embodiment of the invention are working radiation and measuring radiation, especially after the deflection coaxial guided. For example, the merging of the radiation paths of Working radiation and measuring radiation in front of the deflection device via a beam splitter respectively. In this way, the beam adjustment of measuring radiation and working radiation in the beam path in front of the deflector be performed.

at A preferred embodiment of the invention is the receiving device for detecting the existence and / or the distance of the object and / or the reflectivity formed of the object. In an existence detection it is determined whether the object is arranged in the beam path of the measuring radiation, However, a distance measurement is omitted. On the other hand in the detection of the distance also the distance from a reference point, such as B. the deflection, determined to the object. Especially Preferably, the receiving device sets a transit time measurement and / or a phase measurement to measure the distance to. Measuring radiation source, Deflection device and receiving device form in particular Sensor system for environment detection, in particular for 3D environment detection, which is a 2D or 3D image of the object, in particular a 2D scan with depth information. The detection of the reflectivity can, for. B. used to detect a line marking on the object, subsequently the working radiation along the line marking respectively.

at a structurally preferred embodiment of the invention is the Deflection device formed as a reflective unit, which the beam guidance or molding preferably exclusively by reflection elements reached. This structure has the advantage that different wavelengths at least be deflected at the same angle and chromatic distortions are minimized. In other embodiments can but also transmissive elements are used. Especially preferred is the deflector as a scanner unit, z. With scanner mirrors, as an adaptive optics, so an optics, the controlled change the phase of the radiation allowed, or a MEMS unit, So a combination of mechanical elements and actuators a substrate, which also changes the direction of radiation and / or the phase position of the radiation allows executed.

Especially the working radiation and / or the measuring radiation is preferred as a spotlight is formed. As a spotlight, the radiation preferably designated when this maximum maximum opening angle less than 20 °, preferably less than 10 ° and especially less than 5 °. The total opening angle is measured, for example, at the half-width (FWHM threshold). Preferably, the radiations each show a parallel beam path.

With the goal of surveying the object unnoticed or undisturbed by others Carry out radiation to be able to it is preferred if the measuring radiation in a non-visible Area is arranged. Therefor Is it possible, that the measuring radiation in a UV range, an NIR, IR, or FIR area settled is. For example, the visible wave range of 400-750 nm.

at a first possible Embodiment of Invention is the working radiation for illuminating the object educated. The illumination is dimensioned such that at a first alternative, the illuminated object by the human Eye is recognizable. In a second alternative, the illumination is such that the object by an artificial sensor, for. Legs Camera can be recorded.

at another embodiment the invention is the working radiation for processing, in particular Modification of the object, preferably designed as a laser. For example the working radiation may be designed as a laser beam, which it allows the object to be locally heated by more than 10 ° C, in particular to be cut, to coat or melt. The editing of the object can also be done by an exposure, the object for example is exposed with a UV radiation as working radiation to a to achieve photochemical reaction. In particular, the working radiation a power of more than 100 watts and / or a pulse energy of more than 1 J up.

Prefers the irradiation device has a control device, which preferably the deflection device, the working radiation source and the measuring radiation source drives and / or the receiving device read out and which to carry out the subsequent method or the method according to the claim 11 is formed. Preferably, the control device is designed the working radiation and / or the measuring radiation scanning and / or to lead writing.

The invention also relates to a method for irradiating an object with the irradiation device, as described above, wherein the object is selectively irradiated with the working radiation. For the purposes of the invention, selective irradiation is understood to mean that the irradiation is restricted to object regions, that is to say subregions of the object, or the object itself. In particular, the object areas become the selective bestrah selected on the basis of the measured values of the receiving device by the control device.

at a possible embodiment is the control device for detecting the object based formed the measured values of the receiving device. For example can be reflected off of the object Measuring radiation to build a 3D image of the object and this through methods the digital image processing automatically detected and / or classified become. Dependent on the recognition result can be a selective illumination of the recognized Object and / or the subregions of the object take place.

In a preferred embodiment of the invention, it is provided that the measuring radiation and the working radiation are optionally activated jointly or alternately. This results in various operating options of the lighting device, which can also be used mixed:
In a first operating mode, working radiation and measuring radiation are always activated together, wherein the measurement of the object and the irradiation of the object occur simultaneously.

at a second operating mode are working radiation and measuring radiation timed overlapping, wherein the working radiation is activated in those spatial directions, in which are parts of the object, which are illuminated should. By contrast, the measuring radiation is also activated in spatial directions, in which there is no object and / or the working radiation is disabled so that a blanking occurs.

at In a third operating mode, working radiation and measuring radiation are used alternating, not overlapping in time, activated to avoid interactions and disturbances.

Especially Preferably, the irradiation device for writing and / or formed scanning scanning. So z. B. the lighting device the radiation line by line and / or matrix writing by means of lead the deflector.

Further Features, advantages and effects of the invention will become apparent the following description of a preferred embodiment the invention. Showing:

1 a schematic block diagram of an irradiation device as an embodiment of the invention;

2 a schematic representation of a result matrix of the irradiation device of 1 ,

The 1 shows a schematic representation of an irradiation device 1 which is used for the selective irradiation of an object 2 is trained. The irradiation device 1 includes a working radiation source 3 , which for the emission of working radiation of a first wavelength or and a measuring radiation source 4 , which is designed to emit a measuring radiation having a second wavelength, wherein the first and second wavelengths are different. Instead of a wavelength may also be wavelength ranges, which are then not formed overlapping.

The working radiation source 3 sends a working radiation 5 out, which via a deflection 6 can be distracted spatially. The deflection device 6 is for scanning, in particular writing and / or groping deflection of the working radiation 5 educated. That way the object can be 2 For example, be illuminated line by line and column by column. Conceivable is a solid angle deflection, as in the 1 is shown, in alternative embodiments may also be a parallel shift of the working radiation 5 respectively.

The 2 shows for example a matrix 7 with matrix points 8th , wherein the deflecting device 6 is formed, a radiation along lines 9 and columns 10 to scan.

Returning to the 1 is in the beam path of the working radiation 5 in front of the deflector 6 a coupling element 11 in particular interposed in the form of a beam splitter. About the coupling element 11 becomes a measuring radiation 12 the measuring radiation source 4 coaxial in the beam path of the working radiation 5 coupled, so measuring radiation 12 and working radiation 5 - As far as both are activated simultaneously - in the same way from the deflector 6 to get distracted.

The lighting device 1 also includes a receiving device 13 which is for the reception of the object 2 back-reflected or back-radiated measuring radiation 12 is formed and / or arranged.

In the illustrated embodiment, the receiving device 13 via a second coupling element 14 , which is also designed as a beam splitter realized. Measuring radiation source 4 , Deflection device 6 and receiving device 13 together form a sensor system 15 for detecting the object 2 , The sensors 15 can be designed as a 2D sensor, which through the matrix 7 formed measuring field only on the existence of the object 2 examined or as a 3D sensor, which after scanning the measuring field or the matrix 7 a forms three-dimensional object information.

To control the irradiation device 1 is a control device 16 used, which as input variables, the measurement signals or the further processed measurement signals of the sensor 15 receives and as output variables control signals for the deflection 6 , for the measuring radiation source 4 and for the working radiation source 3 as components of the irradiation device 1 provides.

The measuring radiation is considered functionally 12 coaxial with the working radiation 5 coupled, with both radiations via the deflector 6 the matrix 7 and thus scan an edit field or a measuring field writing in the environment. From the back-reflecting parts of the measuring radiation 12 back over the deflection device 6 are guided, the receiving device 13 at each matrix point 8th the matrix 7 object information: Existence yes / no or determine a distance value or a reflectivity value. The control device 16 is designed to recognize an object on the basis of these measured values or derived measured values, for example by a sampled structure 17 ( 2 ) is compared with previously stored reference objects.

In a first mode of operation, the control device 16 to control the components so that the lighting of the object 2 with the working radiation and measuring radiation only within the framework of the detected and / or recognized structure 17 he follows. working radiation 5 and measuring radiation 12 are activated in this mode at the same time, the control device 16 if necessary, performs an object tracking so that the object 2 or the structure 17 always illuminated and measured in the correct position.

In a second mode of operation, the matrix becomes 7 as a measuring field of the measuring radiation 12 always completely scanned, the working radiation 5 is only in the area of the recognized structure 17 selectively activated. In this mode, after each pass of the matrix 7 a new position of the structure 17 and thus the object 2 be detected and in the next pass the object 2 be back in the correct position.

In a third mode, measuring radiation 12 and working radiation 5 alternately activated to avoid mutual interference.

• – Eine selektive Ausleuchtung von Szenarien, vorzugsweise mit bewegten Objekten, z. B. auf einer Bühne, wobei durch die Beleuchtungsvorrichtung 1 ein automatisch nachgeführtes Spotlight zur Beleuchtung eines der bewegten Objekte, insbesondere eines Schauspielers umgesetzt werden kann.
• – In Überwachungsvorrichtungen, z. B. bei Sicherheitsanwendungen, kann durch die Beleuchtungsvorrichtung 1 ein relevantes Objekt durch die Sensorik 15 detektiert und selektiv beleuchtet werden. Wie bei allen Ausführungsformen ist eine Objektverfolgung prinzipiell möglich.
• – Bei anderen Anwendungsgebieten kann die Arbeitsstrahlung 5 z. B. mit UV-Licht ausgeführt sein.
• – Neben der selektiven Beleuchtung des Objekts 2 ist auch eine selektive Ausblendung von Teilbereichen des Objekts 2 möglich, z. B. zur Vermeidung des Rotaugen-Effekts bei der Blitzlichtfotografie durch selektive Nichtbeleuchtung der Pupillen oder für Spezialeffekte bei der Bühnenbeleuchtung.
• – Ein möglicher Vorteil der Erfindung liegt in dem Energieeinsparungspotenzial, da z. B. bei Sicherheitsanwendungen nicht eine gesamte Szenerie beleuchtet werden muss, sondern nur die als relevant eingestuften Objekte.
• – Ein weiteres Anwendungsgebiet liegt im Einsatz der Beleuchtungsvorrichtung 1 zur Ausleuchtung von Gefahrensituationen bei Fahrassistenzsystemen, wobei bewegte Objekte z. B. Fußgänger auf einer Straße selektiv beleuchtet werden können.
• – Weitere Anwendungsgebiete ergeben sich bei der Materialbearbeitung mittels Strahlung, wobei über die Beleuchtungsvorrichtung 1 eine Echtzeitkontrolle des Materialbearbeitungsvorgangs ermöglicht wird. Dieses Anwendungsgebiet ist bei inhomogenen Materialien, wo es auf eine angepasste Intensitätsregelung in Bereichen unterschiedlicher Wirksamkeit der Strahlung ankommt, vorteilhaft einsetzbar.
• – Die Bestrahlungsvorrichtung 1 kann auch zur Materialbearbeitung, z. B. Lasergravur, an bewegten Objekten eingesetzt werden, wobei beispielsweise die Materialbearbeitung in laufender Produktion bei laufendem Fließband ermöglicht wird.
• – Die Beleuchtungsvorrichtung 1 erlaubt auch einen Soll-/Ist-Vergleich einer herzustellenden Form in Echtzeit bei der Materialbearbeitung.
• – Bei einer Materialauftragung, wie z. B. bei einem Drucker oder bei einem Auftragsschweißen, kann die Beleuchtungsvorrichtung 1 eingesetzt werden, um online und/oder in Echtzeit einen Materialauftrag zu überprüfen und gegebenenfalls nachzuregeln bzw. zu steuern.

Possible fields of application of the irradiation device 1 are:

• - A selective illumination of scenarios, preferably with moving objects, eg. B. on a stage, wherein by the lighting device 1 an automatically tracked spotlight for lighting one of the moving objects, in particular an actor can be implemented.
• - In monitoring devices, eg. As in safety applications, can by the lighting device 1 a relevant object through the sensors 15 be detected and selectively illuminated. As with all embodiments, object tracking is possible in principle.
• - In other applications, the working radiation 5 z. B. be carried out with UV light.
• - In addition to the selective illumination of the object 2 is also a selective suppression of subregions of the object 2 possible, for. B. to avoid the red-eye effect in the flash photography by selective non-illumination of the pupils or for special effects in the stage lighting.
• A possible advantage of the invention lies in the energy saving potential, since z. For example, in security applications, it may not be necessary to illuminate an entire scene, but only the objects classified as relevant.
• - Another field of application is the use of the lighting device 1 for illumination of dangerous situations in driver assistance systems, wherein moving objects z. B. pedestrians can be selectively illuminated on a street.
• - Further applications arise in the processing of materials by means of radiation, wherein the lighting device 1 a real-time control of the material processing operation is made possible. This field of application is advantageous for inhomogeneous materials, where it depends on an adapted intensity control in areas of different radiation efficacy.
• - The irradiation device 1 can also be used for material processing, eg. As laser engraving, are used on moving objects, for example, the material processing in running production is made possible while the assembly line is running.
• - The lighting device 1 also allows a target / actual comparison of a shape to be produced in real time during material processing.
• - For a material application, such. B. in a printer or in a hardfacing, the lighting device 1 be used to check a material order online and / or in real time and, if necessary, to adjust or control.

Claims (13)

Irradiation device ( 1 ) with a working radiation source ( 3 ), which are used to irradiate an object ( 2 ) with a working radiation ( 5 ) is formed, with a deflection device ( 6 ), which act as an acti ve beam guiding and / or shaping device for the working radiation ( 5 ) is formed and / or arranged with a measuring radiation source ( 4 ), which are used to output a measuring radiation ( 12 ) is formed, which is at least temporarily directed and / or directionable on the object, and with a receiving device ( 13 ), which are used to receive the measuring radiation reflected back from the object ( 12 ), characterized in that the measuring radiation ( 12 ) via the deflection device ( 6 ) and / or is. Irradiation device ( 1 ) according to claim 1, characterized in that working radiation ( 5 ) and measuring radiation ( 12 ) in particular after the deflection device ( 6 ) are guided coaxially. Irradiation device ( 1 ) according to one of the preceding claims, characterized in that the receiving device ( 13 ) for detecting the existence and / or the distance of the object ( 2 ) is trained. Irradiation device ( 1 ) according to one of the preceding claims, characterized in that the receiving device ( 13 ) converts a transit time measurement and / or phase measurement for measuring the distance. Irradiation device ( 1 ) according to one of the preceding claims, characterized in that the deflection device ( 6 ) is formed as a scanner unit, an adaptive optics or a MEMS unit. Irradiation device ( 1 ) according to one of the preceding claims, characterized in that the working radiation ( 12 ) and / or the measuring radiation ( 5 ) is formed as a spotlight or are. Irradiation device ( 1 ) according to one of the preceding claims, characterized in that the measuring radiation ( 12 ) lies in a non-visible wavelength range. Irradiation device ( 1 ) according to one of the preceding claims, characterized in that the working radiation ( 5 ) for illuminating the object ( 2 ) is trained. Irradiation device ( 1 ) according to one of the preceding claims, characterized in that the working radiation ( 12 ) for processing the object ( 2 ) is trained. Irradiation device ( 1 ) according to one of the preceding claims, characterized by a control device ( 16 ), which is designed for carrying out the subsequent method. Method for irradiating an object with an irradiation device according to one of the preceding claims, characterized in that the irradiation device ( 1 ) for selectively irradiating a detected object ( 2 ) or portions thereof is formed. Method according to claim 11, characterized in that the control device ( 16 ) for object recognition and / or tracking on the basis of the measured values of the receiving device ( 13 ) is trained. Method according to claim 11 or 12, characterized in that the measuring radiation ( 12 ) and the working radiation ( 5 ) are activated together or alternately.