WO2000076714A1

WO2000076714A1 - Laser inscription system and use thereof in a device for treating a workpiece

Info

Publication number: WO2000076714A1
Application number: PCT/DE2000/001927
Authority: WO
Inventors: Andreas Kuntze
Original assignee: Chromatron Laser Systems Gmbh
Priority date: 1999-06-11
Filing date: 2000-06-13
Publication date: 2000-12-21
Also published as: EP1192021A1; DE19928084C2; DE19928084A1

Abstract

The invention relates to a laser inscription system for materials, comprising a laser module (2) and a control module (3), containing, in particular, a microcomputer for said laser module (2). These modules can be interconnected to form at least one compact, transportable inscription unit (1), whereby an element (7) is provided for setting up the inscription unit (1) in a predetermined operating position. This allows a particularly precise orientation of a laser beam (6), even in a transportable laser inscription system. A laser inscription system of this type can also be used with a device for treating a workpiece.

Description

Laser marking system and use in a device for machining a workpiece

description

The invention relates to a laser marking system according to the preamble of claim 1 and its use in a device for machining a workpiece according to claim 50.

From the literature: Walter W. Weinfurtner "Light writes - laser marking in industry: basics and areas of application", Expert-Verlag 1995 (Kontakt &Studium; Volume 479), the principle and the basic structure of a laser marker are known from a solid-state laser with a laser head with, for example, an optical rail, on which the individual optical components are mounted in a temperature and mechanically stable manner.

From WO 98/34789 a device for labeling with a hand-held laser is known. This portable device has a very high mobility. However, particularly good guidance of the marking laser beam is necessary for some marking tasks.

The present invention has for its object to provide a device with which a particularly precise alignment of the laser beam is guaranteed even in a portable laser marking system. According to the invention, this object is achieved by a laser marking system with the features of claim 1.

The use of a means for setting up at least one labeling unit comprising the laser module and the control module in a predeterminable working position ensures that the labeling task can be carried out particularly reliably and precisely in the micrometer range. The control module contains all the devices necessary for controlling the laser, e.g. Microcomputer. Several labeling units can result in a laser labeling system.

It is advantageous if the labeling unit is cuboid, one side of the cuboid then being designed as a standing surface. Such an arrangement is inexpensive to manufacture. With such an arrangement, it is advantageous if the width of a narrow side of the labeling unit is less than or equal to 7.5 cm, since this leads to a particularly compact design. It is also advantageous if the laser module is compact, a width of the laser module of the labeling unit of 280 mm, a height of 70 mm and a length of 400 mm, but in particular with a width of 150 mm, a height of 40 mm and a length of 250 mm.

It is also advantageous if, in the laser marking system according to the invention, the laser module and the control module are arranged together in one housing. Such a monolithic construction creates a robust design, especially for industrial use.

In an advantageous embodiment of the laser marking system according to the invention, the marking unit has a base as a means for installation. This enables the labeling unit to stand in a particularly secure position. It is particularly advantageous if the labeling unit can be connected or connected to the means for setting up and the means for setting up the labeling unit has at least one storage position and one working position for the labeling unit. This ensures a secure footing, while adapting the work position provides a high degree of flexibility for carrying out the labeling task. It is advantageous if the means for positioning has a folding device with which the labeling unit can be pivoted from the storage position into the working position, so that a particularly simple change between the positions is possible.

In a further particularly advantageous embodiment, the labeling unit consisting of the laser module and the control module can be connected to a case, the labeling unit being pivotable into a working position from the storage position in the case by the means.

The laser marking system according to the invention can thus be transported in a simple manner. When you have arrived at the location where the labeling task is to be carried out, the case is opened and the labeling unit is pivoted into the working position, e.g. folded up. The lettering can thus be carried out straight from the case, with the safe installation of the laser marking system ensuring high lettering quality.

In a further embodiment of the laser marking system according to the invention, the marking unit has a coupling means for a machine. This is particularly advantageous for a coupling with a machine tool (eg turning or milling machine). An existing machine can thus be "retrofitted with a labeling system. Because of the housing of the labeling unit, this can be part of a wall of the machine tool. An assembly, for example, on a Z-axis module of the machine tool is also possible. Furthermore, the laser labeling system can be used wherever there is more than one machine The coupling means can ensure a secure connection to the machine.

It is advantageous if the laser module is coupled to at least one movably connectable or to a movably connected deflection module for at least one laser beam. The deflection module, also called scan head, for the laser beam can thus be coupled to the laser module, so that a particularly compact design is created during operation. It may be advantageous to remove the deflection module from the laser module, e.g. to enable space-saving packaging.

It is also advantageous that the laser marking system according to the invention has at least one movable deflection module which is aligned with the laser beam of the laser module. The deflection module can thus be set up spatially independently of the laser module in order to achieve the greatest possible flexibility in use.

Furthermore, it is advantageous if at least one deflection module can be locked in predeterminable positions, so that an exact alignment is ensured. For precise and simple control, it is advantageous if at least one deflection module can be driven by a motor. For the same reason, it is advantageous if the labeling unit has a rail guide for at least one deflection module. By combining several deflection modules with a labeling system according to the invention, several labeling tasks can be solved simultaneously.

A particularly compact and secure design of the labeling unit (laser module and control module) is advantageously obtained if the control module has a power supply and a means for shielding against electromagnetic radiation from the control module. The shielding, in particular the housing of the control module itself, ensures that there are largely no interactions due to electromagnetic radiation. The housing forms a Faraday cage.

The control module advantageously has a computer, a screen of the computer being arranged on the control module. This also contributes to a particularly compact design, which is particularly important when the labeling has to be carried out in tight spaces.

The flexibility is advantageously increased in that the labeling unit can be connected to a computer and / or a keyboard. As a result, an external computer system can be used to control the labeling unit.

A particularly compact design is achieved with an advantageous embodiment in which the positioning means is designed to be pivotable, with a stand element having a keyboard. In this way, for example, a base of a foldable positioning device is equipped with an additional function. It is particularly advantageous if a camera, in particular a digital camera, is used to monitor the labeling process. The captured image can be displayed on a monitor or on the screen of the control module in order to immediately identify any deviations or errors.

The transportable laser marking system advantageously has a means for spatially aligning the marking unit. With this e.g. a precise horizontal, vertical or angular alignment can be carried out so that high-precision labeling is possible in any position.

It is particularly advantageous to use a laser beam from the laser marking system itself to determine the spatial position. In particular, a pilot laser of the labeling system can be used for this. The measurement results can then advantageously be used to automatically control means for aligning the labeling unit. In this way, the laser marking system itself can be used to precisely align.

In order to achieve a particularly accurate inscription result, the means for installing the inscription unit has damping elements, so that e.g. labeling is also possible in locations with vibrations.

Advantageously, the laser marking system has means for remote control of the marking unit, so that marking is also possible in places where a user cannot be at the laser marking device, for example due to a health-damaging atmosphere or tight spatial conditions. The laser marking system according to the invention advantageously has fastening means with which it can be fastened on a movable device. This enables the system to be attached to a rail car, for example, and to be labeled continuously while driving or at certain points while driving.

A laser marking system according to the invention also has at least one movement means, in particular wheels and / or caterpillars, for the marking unit and / or the deflection module. This means that the portable, compact laser marking system can be moved independently or remotely over a surface to perform a marking task.

In a further advantageous embodiment, a laser marking system has a connecting means with which at least two laser marking systems can be coupled to one another. This means e.g. the coordinated operation of several portable laser marking systems is possible. Several laser modules can also be connected in parallel or in series to increase the effect. It is particularly advantageous if at least two laser modules can be coupled to a control module so that one control module is sufficient to control a plurality of laser modules.

The laser marking system according to the invention advantageously has a signaling means which is arranged on the laser module to display the operating state of the laser marking system. This enables a user, for example, in the case of laser beams in the invisible frequency range, to recognize whether the laser is in operation. The signal means particularly advantageously has a plexiglass block illuminated with at least one LED, which extends over an entire dimension of the laser module. This means that the signaling means can still be recognized even with an inscription unit of the laser inscription system lying on the side. In an advantageous embodiment, the laser marking system according to the invention has a coolant for the laser module and / or the control module, through which the heat generated by the modules can be dissipated. It is particularly advantageous if the coolant has at least one heat transfer medium which is connected to the housing of the control module and / or laser module. For example, good heat dissipation to the surroundings can be achieved by a common area of control module and coolant.

A particularly advantageous embodiment is when the coolant is designed as a hollow-fin fan assembly. These units can be made compact, so that the size of the labeling unit is not increased. In order to achieve good convection, it is advantageous to use two fans, e.g. to be arranged at the ends of the hollow-rib fan unit.

The hollow finned fan unit advantageously has a heat exchanger surface for connection to the housing of the labeling unit. Due to the contact of the hollow-rib fan unit with the housing of the labeling unit, the housing is used for heat dissipation, so that a particularly simple design is achieved.

The coolant also advantageously has a heat exchanger which is integrated into the wall of the housing and / or can be coupled to the housing. The heat dissipation capacity of the coolant can thus be increased. It is particularly advantageous if the heat exchanger can be operated with a heat exchange medium, in particular water, since this enables particularly efficient cooling. It is also advantageous if the heat exchanger has cooling fins, since the cooling capacity can be increased in a simple manner.

The laser marking system according to the invention advantageously has at least one current source for a pump laser diode, a Q-switch driver, a logic driver, a power supply unit for microcomputers and / or another element of the marking unit with a DC / DC converter (DC converter). DC / DC converters are available as particularly compact assemblies, so that a particularly space-saving design of the labeling unit is possible. The current source for the pump laser diode is designed to be particularly advantageous.

In an advantageous embodiment of the laser marking system according to the invention, the housing of the marking unit has a means, in particular a closable opening, for replacing a pump laser diode of the laser module. This means that the pump laser diode can be exchanged without misaligning the actual laser itself. The maintenance of the laser marking system according to the invention can thus be increased. It is particularly advantageous if the pump laser diode can be connected to the laser via an optical waveguide, since the influence of the laser circuit when the pump laser diodes are replaced is thereby very small. A pump laser diode can be exchanged particularly easily if at least one pump laser diode is arranged in a cartridge as a replacement module.

Advantageously, more than one pump laser diode is used, the light of which is guided over waveguides, the light behind the waveguides via at least one polarization coupler and at least one deflection mirror. gel is merged. This keeps the complex and sensitive polarization coupling spatially separate from the pump laser diodes, which are accessible from the outside.

Advantageously, at least one waveguide is formed as a loop by a pump laser diode in the housing for extending the waveguide, in particular by means of a handle of the labeling unit.

In order to ensure contamination of the sensitive laser circuit when changing the pump laser diodes, it is advantageous that at least one pump laser diode is separated from the laser space of the laser module in a dust-tight manner.

For industrial use, it is advantageous if more than one labeling unit can be controlled by a computer, so that a laser labeling system with multiple, compact labeling units is created. It is particularly advantageous if at least one labeling unit has at least one connector for connection to a holding device (arrangement in a working position), in particular with standardized slots. This makes it easy to replace labeling units. In such a system, the laser beam also always has the same position, so that the adjustment effort is reduced or even eliminated.

It is advantageous to use a laser marking system according to the invention in a device for machining workpieces, in particular a machine tool. The compact labeling unit can be combined with a device as required, so that the device does not have to be constantly equipped with a labeling unit. It is particularly advantageous if the laser marking system according to the invention has a surface the device is arranged flush. This makes it easy to produce a surface that is easy to clean.

The invention is explained in more detail below with reference to the figures of the drawings using several exemplary embodiments. Show it:

1 shows a schematic representation of a laser marking system with a marking unit consisting of a laser module and a control module and a separate deflection module;

2 shows a schematic illustration in an exploded view of a laser marking system with a marking unit consisting of a laser module, a control module and a foldable means for setting up the marking unit;

3 shows a further schematic illustration of a laser marking system with a marking unit consisting of a laser module, a control module and a foldable means for setting up the marking unit;

4 is a schematic illustration of a laser marking system connected to a computer;

5 shows a schematic illustration of a laser marking system which is set up in a device for machining workpieces;

5a shows a schematic illustration of the laser marking system according to FIG. 5, a marking unit being arranged flush with a surface of the device for machining workpieces; 6 shows a schematic illustration of a laser marking system, in which a screen is arranged in the control module;

6a shows a schematic illustration of a laser marking system according to FIG. 5, in which the screen is designed as a touchscreen;

7 shows a schematic illustration of a laser marking system in which a keyboard is arranged in a foldable means for positioning;

8 shows a schematic illustration of the internal components of a laser marking system constructed as a monolith;

9 is a schematic side view of a monolithic laser marking system with an integrated deflection module;

10 shows a schematic top view of three synchronously switched laser marking systems with an integrated deflection module;

11 shows a schematic view of six laser marking systems connected in a star shape;

Fig. 12 schematic representation of two pump laser diodes with a polarization coupling.

1 shows a laser marking system according to the invention in a schematic manner. Conventional laser marking systems, such as described in WO 98/34789, can mark a large number of materials such as plastics, foils, steels, non-magnetic metals, ceramics or enamel with great accuracy.

The term "lettering" is understood to mean any type of object marking, for example providing any type of font, but also creating image elements and three-dimensional engravings. Furthermore, the term "labeling" is understood to mean the removal of labeling elements by removing surface layers (e.g. barcodes, graffiti, etc.) and the like.

A laser marking system according to the invention has a marking unit 1 with a laser module 2 and a control module 3, the two modules together forming the portable marking unit 1. The control module 3 has the devices necessary for the control and regulation of the functions of the laser marking system, in particular a Peltier driver (TEC driver), a laser power supply unit, a Q-switch driver, a switch-on and security logic, and a circuit for the control of at least one deflection module (4) and an amplifier.

The control module 3 is shielded by a metallic housing (Faraday cage), so that scattered radiation has no negative effect on the function of the laser marker. Radiation, in particular high-frequency radiation from components of the control module itself, cannot develop any harmful influences. In particular, the use of plug-in modules avoids the use of cables which can serve as the source of such interfering signals. A portable labeling unit 1 is understood here to mean that it can be easily transported by a person. A means 7 for setting up the labeling unit in a predeterminable working position (see, for example, FIG. 3), which can be connected or connected to the labeling unit or is molded onto it, can be carried together with the labeling unit 1. A typical weight for such a unit is 3 to 15 kg.

This usually results in a size of a small case or a laptop computer for the labeling unit 1. The proportions are shown in FIGS. 4 and 5.

Due to the modular structure, different modules (e.g. different laser types with different wavelengths, beam properties (e.g. pulsed, not pulsed) with a control module) can be combined with each other, so that the type suitable for the respective labeling task can be selected and the labeling system adapted to the circumstances becomes. At least two laser marking systems can be coupled to one another by connecting means, not shown here. With this e.g. the power of the laser is increased by combining several laser modules (2). A control module (3) can also control a plurality of laser modules (2).

In the present case, the labeling unit 1 has a cuboid laser module 2 and a cuboid control module 3. Since both the laser module 2 and the control module 3 have the same height, the labeling unit 1 as a whole has a continuous surface as a standing surface, which serves as a means 7 for setting up the labeling unit. In the embodiment shown here, the laser module 2 and the control module 3 can be connected to one another, the connection point being visible from the outside. Alternatively, it is also possible to accommodate both modules 2, 3 in one housing, so that a monolith is formed.

Basically, however, the aim is that individual modules (e.g. laser module, control module, cartridge for pump laser diode in Fig. 8)), even if they are arranged in a housing, are easily replaceable. This is intended to improve maintenance, particularly in industrial production.

This footprint is designed so that it ensures a secure stand of the labeling unit 1 in the working position (a lying position in Fig. 1). The labeling unit 1 not only has a parting surface for storage, but also has a specially designed means for setting up the labeling unit 1 in order to carry out the labeling process safely and reliably in the set-up state.

For example, in the construction shown in FIG. 1, it is important that the contact surfaces between the laser module 2 and the control module 3 are made very flat in order to create a good contact possibility. The alignment of a laser beam 6 must also be coordinated with the means 7 for installation, in this case the support surface, so that precise labeling is possible.

In an alternative embodiment, a device for spatial alignment (eg leveling by means of adjustable feet) is arranged on the stand area 7 in order to compensate for manufacturing irregularities or unevenness of a base. The control module 3 also has a means for recognizing the spatial position of the labeling unit 1, such as, for example, integrated spirit levels, on. To compensate for any vibrations, damping elements (eg rubber elements) are arranged on the means 7 for installation.

It is also possible to use the laser beam 6 itself or an alignment laser beam (pilot laser) to detect the spatial position, for example by Distances to the items to be labeled 5 and the spatial surroundings of the labeling unit 1 are measured. Depending on the measured values, the means for spatial alignment can then be controlled automatically in order to achieve a predeterminable position (e.g. exact angular position).

By appropriately designing a narrow side of the labeling unit 1, this narrow side could also serve as a standing surface for the installation of the labeling system. In any case, it is very important that a secure stand is made possible so that the laser beam 6 can be inscribed precisely.

The laser beam 6 is generated within the laser module 2. In the present case, an Nd: YAG laser is used as the laser, which is particularly suitable for inscriptions. In principle, however, each type of laser is suitable for a laser marking system according to the invention. The beam path inside the laser module is folded several times with different 90-degree mirrors in order to achieve a compact design of the laser module. After leaving the laser module 2, the laser beam 6 is deflected by the pivotable deflection module 4 onto the item 5 to be inscribed. Each deflection module 4 here has two galvanometer deflection devices (also called galvos). In principle, other deflection devices are also possible. The deflection module 4 can thus be arranged on the housing in a latchable, displaceable or rotatable manner. Alternatively, a rail guide or a motor drive of a deflection module 4 is also possible. In a manner not shown here, the laser module 2 has a flap behind which the pump laser diode 23 is arranged (see FIG. 8). The pump laser diode 23 is connected to the laser via an optical waveguide. By opening the flap, the pump laser diode 23 can be replaced in a simple manner without the laser itself being misaligned.

Alternatively, the pump laser diode 23 can be arranged in a cartridge (or cartridge), which enables quick installation and removal from the laser module 2. The cartridge contains the pump laser diode 23 and all the necessary connections to the outside.

In order to ensure the most space-saving construction possible, the controllable power supply for the pump laser diode 23 is equipped with a DC / DC converter.

As a result of the deflection of the laser beam 6 in the deflection module 4, the labels are generated by the laser beam 6 moving over the item 5 to be labeled.

In Fig. 1, the deflection module 4 is not connected to the laser module 2, but is attached to a device, not shown. Drives of the deflection module 4, not shown in FIG. 1, ensure that the laser beam can be deflected in spatial directions. Another design in which a deflection module 5 is connected to the laser module 2 is shown in FIG. 5. In principle, it is also possible to couple a plurality of deflection modules 4 to the laser module 2, so that the deflection modules 4 can simultaneously perform independent labeling tasks.

The laser module 2 has a signaling means 10 which serves to display the operating state of the laser marking system. This signaling means 10 is designed as a plexiglass block that is laterally surrounded by a group of colored LED is illuminated. A suitable mirroring and sandblasting of the plexiglass block ensures that the entire block assumes a predetermined color homogeneously. The LEDs work independently of one another, so that lighting of the signaling means 10 is ensured even if one LED fails.

Since the block extends over an entire dimension of the laser module 2, a user can also recognize the state of the signaling means 10 when the labeling unit is on the side (as shown in FIG. 1). Basically, a signal means any device with which a user can receive information about the operating state of the laser marking system. For example, the use of LCD displays as signaling means 10 is also possible.

Since the laser module 2 and the control module 3 generate heat, a coolant 11 is provided, which ensures heat dissipation. In the present case, the coolant 11 is designed as a hollow-fin fan unit (“cooling gun”). This is a hollow, cuboid-shaped element, which has a fan at each end, which ensures forced convection within the unit. The heat generated is transferred via the outer surfaces of the hollow finned fan unit, which serve as heat transfer medium. In the interior of the housing of the control module 3, a shoulder is arranged as the heat exchanger surface of the coolant 11, so that good heat conduction is ensured between the coolant 11 and the housing. As a result, the coolant 11 is stored inside the housing and, at the same time, good heat transfer is ensured. In Fig. 1 it is shown that the coolant 11 is arranged in the upper part of the control module 3. As a result, the cooling medium 11 is located between the laser module 2 and the control module 3, so that efficient heat dissipation is possible from both modules. In principle, alternatively or additionally, cooling fins can also be arranged on the housing of the labeling unit. Other types of heat exchangers (eg with water cooling) can also be used. Furthermore, the cooling means 11 can be designed as a separate module that can be connected to the laser module 2 and / or the control module 3.

In the following figures, the reference numerals of FIG. 1 are used for identical components, so that a renewed description of the same components is usually unnecessary.

Fig. 2 shows a labeling system with basically the same structure as Fig. 1. In the illustration of the labeling unit 1 but it is indicated here that it is composed of three modules, namely the laser module 2, the control module 3 and the means 7 for installation . The means 7 for installation is designed here as a pivotable element that e.g. can be attached to a solid surface (e.g. wall, table). The specification of the angle alpha indicates that the means 7 for installation, and thus the entire labeling unit 1, can be pivoted about an axis and, if necessary, locked.

The double arrow in the deflection module 4 here indicates that the deflection module 4 can be pivoted about the axis of the laser beam 6. The deflection module 4 is removably arranged on the laser module in the functional position.

The elements shown individually in the exploded view can be combined to form a monolithic labeling unit 1. However, the individual parts can also be designed to be electrically separate. FIG. 3 also shows a pivotable labeling unit 1, consisting of laser module 2, control module 3 and the pivotable means 7 for installation. The labeling unit 1 can be mounted in a case (not shown here), the angle alpha being zero in a storage position in the case. After opening the case, the labeling unit 1 would be folded up to bring the labeling unit 1 into a working position. 3, the angle alpha is approximately 70 °. The setting of the angle alpha depends on the respective labeling task, the deflection module 4 directing the laser beam 6 onto the labeling item 5, taking into account the inclination alpha.

By integrating the labeling unit 1 in a case, a portable laser labeling system is created, which can be quickly used even in different working conditions by the pivoting mechanism.

4 shows a laser marking system according to the invention with a laser module 2, a control module 3 and a means 7 for installation. As in Fig. 3, the means 7 for installation is designed as a folding mechanism, i.e. the labeling unit is pivoted about an axis.

The laser marking system is connected to a computer 8, via which the laser marking system can be controlled. For example, 8 control commands can be sent to the labeling system via a keyboard of the computer in order to label the item 5 to be labeled, which is not shown here. Software for the respective labeling task can thus be stored on the computer. Corresponding storage software can be stored when used to label spare parts or components. The laser can be used to scan a barcode and write a Barcodes are used, whereby an old barcode can possibly be made illegible with the laser. Due to the portability of the laser marking system, flexible marking can be carried out directly at different points in a company, especially with complex material flows.

With a camera (not shown here) in the deflection module 4, it is possible to record the labeling process and transfer it to the screen of the computer 8. If this process is displayed in a window on the computer screen, the user can control the laser marking system and at the same time monitor the progress of the marking. In an alternative device, the screen 12 can also be integrated into the control module 3 or the housing (see FIGS. 6, 6a).

A keyboard can also be connected to the control module 3 or integrated into it. A remote control can also be carried out by means of a remote data transmission device, which is particularly important in places where there is a harmful environment. The portable laser marking system can then be brought to this location before marking; the actual control then takes place from a safe place.

In a further alternative embodiment, the laser marking system itself is designed to be mobile, for example it has wheels and / or caterpillars. This means that the compact and light unit can move independently on a surface (e.g. an aircraft) and carry out labeling or material removal work. The system can be controlled remotely from a remote location. 5 shows an arrangement of the laser marking system according to the invention in a device 9 for workpiece machining, here a machining center. Fastening means, not shown here, fix the laser marking system to a wall of the device 9 so that the marking can be done cleanly. Thus, even in a device 9 that is not actually designed for labeling, labeling can be made possible by the portable laser labeling system. Thus, a combination of the laser marking system with machine tools is conceivable, the means 7 for installation being adapted to the geometry of the "guest machine". The laser marking system can be coupled with a specific axis of movement of the machine tool (eg X, Y or Z axis) in order to enable specific marking along this axis. In principle, the device according to the invention can be arranged on all feed devices of a device 9 for workpiece machining.

5a shows a modification of the use of the laser marking system according to FIG. 5. An outer surface of the labeling unit 1 is included directly as part of the housing. Since the housing is particularly stable, the housing can also withstand higher loads. The housing is flush with a surface of the device 9 for workpiece machining.

A situation similar to that in FIG. 4 is shown in FIG. 6. In contrast to this, the screen 12 is integrated directly into the control module 3 and a keyboard 13 is connected to the control module 3. A particularly compact design is thus achieved. 6a, a touch screen is used as the screen 12, so that one may not need an external keyboard, since the commands are entered directly on the screen 12. The screen 12 also extends over the entire housing, in which the laser modules and control modules (not shown here) are integrated.

FIG. 7 shows a laser marking system according to the invention, in which the means 7 for positioning is designed as a kind of pedestal, the marking unit being pivotable about an axis A. Such a system can e.g. can be arranged portable in a suitcase.

The means 7 for positioning has a keyboard 13 which is arranged on the means 7 for positioning. Control commands for a computer can be entered inside the control module 3 via the keyboard 13. The computer then controls the deflection module 4 (not shown here) via the control module 3 in order to carry out labeling.

Since the screen 12 of the computer is arranged on the control module 3, a particularly compact design is achieved. Basically there is a laptop computer with a built-in laser marking system.

8 shows the structure of a monolithic laser marking system in a schematic manner. The laser module 2, control module 3 and the hollow-rib fan unit 11 are arranged in a housing of the labeling unit (i.e. monolithic).

The laser module 2 has a laser chamber 21 and a laser diode chamber 22, the laser chamber 21 being sealed off from the laser diode chamber 21 in a dust-tight manner. The laser diode chamber 22 has a pump laser diode 23, which is accessible, for example, for replacement via a flap in the housing (not shown here). The separation of the laser diode chamber 22 and the laser chamber 21 prevents dust from entering the laser chamber 21 when a pump laser diode 23 is replaced.

The pump laser diode 23 can be removed as an individual part, or can be arranged encapsulated in the form of a cartridge 30 (indicated by dashed lines in FIG. 8). With an arrangement in a cartridge 30, the replacement of the pump laser diodes 23 is particularly simple.

A Peltier element 24 is arranged as a cooling element on the pump laser diode 23. The Peltier element 24 has a flat surface which is connected to the housing of the labeling unit 1 in order to ensure the heat dissipation. In the present case, there is contact with the wall of the hollow-rib fan unit 11, contact being possible with other parts of the housing in alternative configurations.

The pump laser diode 23 is coupled to a waveguide 26 via a threaded connection 25. The light from the pump laser diode 23 is radiated into the dust-free laser chamber 21 via the threaded connection. As waveguide 26, e.g. Glass fiber or mirrored glass tubes are used. In the present case, a glass fiber cable is used as the waveguide 26. This is slightly bent, since a change in the reflection behavior is thereby achieved, so that the homogeneity of the laser light is improved over the cross section of the glass fiber cable 26.

The laser light is guided through a collimator lens 27 to a converging lens 28, which bundles the laser light onto a laser crystal. For reasons of clarity, the laser crystal is not explicitly shown here. Element 29 stands for the downstream units that are run through. The laser crystal is provided with a highly reflective mirror on the crystal or a separate mirror. After a Q-switch, a shutter as a safety measure, a coupling-out mirror and an expansion lens, the laser beam 6 (not shown here) is then emitted.

The essential parts of the laser module 2 are thus arranged in a compact unit, which ensures easier maintenance due to the division into the laser chamber 21 and the laser diode chamber 22. The arrangement of the pump laser diode 23 in a cartridge 30 creates a modular system that is particularly easy to handle.

In an alternative embodiment, the waveguide 26 is made significantly longer to take advantage of the waveguide effect, i.e. to achieve a greater homogenization of the laser light in the waveguide 26. For this purpose, the waveguide 26 is guided in a loop through the housing of the labeling unit 1, the curvature must not be too strong, since otherwise excessive losses occur. The waveguide 26 can e.g. a cut-out on the inside of the housing. If the labeling unit 1 has a handle in the form of a closed curve, the waveguide 26 can pass through this handle in order to make the length of the waveguide as large as possible in a simple manner.

The units which are arranged in the laser module 2 radiate a not inconsiderable amount of heat which is dissipated via the hollow-fin cooler unit 11. The elements in the laser chamber 21 and in the laser diode chamber 22 contribute to the thermal load. Two fans 31 for generating forced convection are shown schematically here. In principle, several fans 31 can also be connected in series and / or in parallel to improve convection.

Heat also accumulates in the control module 3, in particular due to the switching power supplies 32 (or DC / DC converters) which can be generated for different voltage levels (e.g. for Q-switches, logic circuits, deflection modules, high-frequency drivers).

FIG. 9 shows a monolithically encapsulated labeling unit 1 in a side view, in which the deflection modules are not arranged outside (as e.g. in FIG. 5) but are integrated into the housing. For reasons of simplicity, three possible arrangements are shown here simultaneously. The laser beams 6 ′, 6 ″, 6 ″ ″ leave the cuboid housing of the labeling unit 1 on a different surface in each case. The first laser beam 6 'basically points upwards, i.e. the deflection module inside the labeling unit 1 is able to control the alignment of the first laser beam in a desired cone.

The second laser beam 6 ″ is emitted from the end face of the labeling unit 1 (to the left in FIG. 9). Here, too, the laser beam can be adjusted within a certain angular range.

The third laser beam 6 '' 'is perpendicular to the plane of the drawing.

In principle, any number of deflection modules can be arranged in an inscription unit 1, for example two or more on one surface, in order to enable beam bundling. This form of the monolithic labeling unit 1 is particularly advantageous if it is arranged in a holder (for example for arrangement in a working position) in a standardized manner, for example in the manner of the 19 '' racks (for example for electronic plug-in cards, electronic boards). The holder and the necessary connecting elements of the labeling unit 1 are a means for arranging the labeling unit in a predeterminable working position.

For this purpose, the labeling unit 1 has two plug connections 32a, 32b, via which the labeling unit 1 can be inserted into such a holder. Alternatively, there can also be only one plug connection.

Especially in the production environment, the standardized arrangement of the labeling unit 1 in racks or the like Considerable cost savings can be achieved, since one of the monolithic labeling units 1 can simply be replaced from a rack in the event of maintenance. The labeling unit is supplied with power and data via the plug connections 32a, 32b, without the need for complex cabling.

The labeling unit 1 thus represents a type of cartridge, which can be arranged in a holder in a precise location, which facilitates the assembly and operation of such a system, since the laser beam always has the same position due to the always the same arrangement.

10 schematically shows a laser marking system with an arrangement of three marking units la, lb, lc, the laser beams 6a, 6b, 6c of which are directed onto the marking material 5. For reasons of simplicity, the laser beams 6a, 6b, 6c are shown here in parallel, the deflection modules in the monolithically designed labeling units 1 being the laser beams 6a, 6b, 6c can lead over the inscription 5 within a certain cone. The labeling fields of the individual beams 6a, 6b, 6c can also overlap.

An alternative embodiment of the arrangements of a plurality of labeling units 1 is shown in FIG. 11. Here the labeling units 1 of the laser labeling system are arranged in a star shape. The representation is chosen so that the laser beams 6 emerge from the drawing plane.

A central control (not shown here) makes it possible to control the laser beams 6, 6a, 6b, 6c of a plurality of labeling units 1. By combining several laser beams 6, 6a, 6b, 6c, time can be saved because e.g. Laser beams can work in parallel (e.g. one on a font, another on a graphic).

In principle, it is possible to combine any number of labeling units 1 into a laser labeling system.

A particularly easy to maintain arrangement for pump laser diodes 23a, 23b is shown in FIG.

The pump laser diodes 23a, 23b have a coupling device 40a, 40b, which has a connection between the pump laser diodes 23a, 23b and glass fiber cables 41a, 41b as waveguides. The laser light from the pump laser diodes 23a, 23b is conducted to the collimator lenses 43a, 43b via the glass fiber cables 41a, 41b via connecting plugs 42a, 42b. The collimated light of the first pump laser diode 23a (top in FIG. 12) is brought together with the collimated light of the second pump laser diode 23b (bottom in FIG. 12) via a polarization coupler 44 (eg polarization plate, polarization cube). The collimated light of the The second pump laser diode 23b is previously directed onto the polarization coupler 44 via a deflection mirror 45. These coupled beams 46 are now used in the laser module 2 for pumping a laser crystal, not shown here, or are in turn fed into glass fiber cables.

Alternatively, a second laser line of sight can be radiated directly onto the polarization coupler 44, so that the mirror 45 can be omitted.

The advantage of this circuit is that there is no need for complex adjustment work when replacing a pump laser diode 23a, 23b. The radiation is fed into the glass fiber cables 41a, 41b without other parts of the laser circuit being adjusted. The coupling of the coupled beams 46, which is particularly critical for the adjustment, takes place far from the pump laser diodes 23a, 23b which may have to be exchanged.

In principle, it is possible to construct a circuit according to FIG. 12 with more than two pump laser diodes 23a, 23b, the pump laser diodes 23a, 23b connected in parallel being brought together via a corresponding number of polarization couplers 44 and deflection mirrors 45.

The coupled beams 46 can be fed into melted (tapered) fibers or fed into a glass fiber bundle.

It is also possible to direct the polarized rays directly onto a laser crystal by means of a lens system for the purpose of pumping. The embodiment of the invention is not limited to the preferred exemplary embodiments specified above. Rather, a number of variants are conceivable which make use of the labeling system according to the invention even in the case of fundamentally different types.

Claims

Expectations

1. laser marking system for materials with a laser module (2) and a control module (3), in particular with a microcomputer, for the laser module (2), the modules being connectable to at least one compact, transportable marking unit (1),

marked by

means (7) for setting up the labeling unit (1) in a predeterminable working position.

Laser marking system according to Claim 1, characterized in that at least one marking unit (1) is cuboid, one side of the cuboid being designed as a standing surface (7).

Laser marking system according to claim 2, characterized in that the width of a narrow side of the marking unit (1) is less than or equal to 7.5 cm.

Laser marking system according to Claim 2, characterized in that the width of the laser module (2) of the marking unit (1) is 280mm, the height is 70mm, the length is 400mm, but in particular the width is 150mm, the height is 40mm and the length is 250mm.

5. Laser marking system according to at least one of the preceding claims, characterized in that the laser module (1) and the control module (2) are arranged together in one housing.

6. Laser marking system according to at least one of the preceding claims, characterized in that the labeling unit (1) has a base as a means (7) for installation.

Laser marking system according to at least one of the preceding claims, characterized in that the marking unit (1) can be connected or connected to the means (7) for setting up and the means (7) for setting up the marking unit (1) has at least one storage position and one working position for the Labeling unit (1).

Laser marking system according to at least one of the preceding claims, characterized in that the positioning means (7) has a folding device with which the marking unit (1) can be pivoted from a storage position into a working position.

Laser labeling system according to at least one of the preceding claims, characterized in that the labeling unit (1) can be connected to a case, the labeling unit (1) being pivotable by the means (7) for installation from a storage position in the case into a working position.

10. Laser labeling system according to at least one of the preceding claims, characterized in that the labeling unit (1) has a coupling means for a machine, in particular a machine tool.

11. Laser marking system according to at least one of the preceding claims, characterized by at least one with the laser module (2) movably connectable or movably connected deflection module (4) for at least one laser beam (6) of the laser module (2).

12. Laser marking system according to claim 11, characterized in that at least one deflection module (4) can be locked in predetermined positions.

13. Laser marking system according to claim 11 or 12, characterized in that at least one deflection module (4) can be driven by a motor.

14. Laser marking system according to at least one of claims 11 to 13, characterized in that the labeling unit (1) has a rail guide for at least one deflection module (4).

15. Laser marking system according to at least one of claims 11 to 14, characterized by at least one movable deflection module (4) which is aligned with the laser beam (6) of the laser module (2).

16. Laser marking system according to at least one of the preceding claims, characterized in that the control module (3) has a power supply and a means for shielding electromagnetic radiation, in particular by a housing acting as a Faraday cage.

17. Laser marking system according to at least one of the preceding claims, characterized in that the control module (3) has a computer (8), a screen (12) of the computer (8) being arranged on the control module (3).

18. Laser labeling system according to at least one of the preceding claims, characterized in that the labeling unit (1) can be connected to a computer (8) and / or a keyboard.

19. Laser marking system according to at least one of the preceding claims, characterized in that the means (7) for pivoting is designed, wherein a stand element has a keyboard (13).

20. Laser marking system according to at least one of the preceding claims, characterized by a camera, in particular a digital camera, for monitoring the marking process.

21. Laser marking system according to at least one of the preceding claims, characterized by a means for the spatial alignment of the labeling unit (1).

22. Laser marking system according to claim 21, characterized in that a laser beam (6), in particular a pilot laser of the laser module (2) for detecting the spatial position of the labeling unit (1) can be used.

23. Laser marking system according to claim 21 or 22, characterized in that the means for the spatial alignment of the labeling unit (1) can be controlled automatically as a function of the measured values detected.

24. Laser marking system according to at least one of the preceding claims, characterized in that the means (7) for setting up the labeling unit (1) has damping elements.

25. Laser marking system according to at least one of the preceding claims, characterized by a means for remote control of the labeling unit (1) •

26. Laser marking system according to at least one of the preceding claims, characterized by a connecting means for arrangement on a movable device, in particular a rail-guided device.

27. Laser marking system according to at least one of the preceding claims, characterized by at least one movement means, in particular wheels and / or caterpillars, for the marking unit (1) and / or the deflection module (4).

28. Laser marking system according to at least one of the preceding claims, characterized by a connecting means with which at least two laser marking systems can be coupled to one another.

29. Laser marking system according to claim 28, characterized in that at least two laser modules (2) with a control module (3) can be coupled.

30. Laser marking system according to at least one of the preceding claims, characterized by a signal means (10) which is arranged on the laser module (2) for displaying the operating state of the laser marking system.

31. Laser marking system according to claim 30, characterized in that the signal means (10) has a plexiglass block illuminated with at least one LED, which extends over an entire dimension of the laser module (2).

32. Laser marking system according to at least one of the preceding claims, characterized by a

Coolant (11) for the laser module (2) and / or the control module (3).

33. Laser marking system according to claim 32, characterized in that the cooling means (11) has at least one heat transfer means which is in connection with a housing of the control module (3) and / or laser module (2).

34. Laser marking system according to claim 32 or 33, characterized in that the cooling means (11) is designed as a hollow-rib fan unit.

35. Laser marking system according to claim 34, characterized in that the hollow-rib fan unit (11) has at least two fans for generating a convective flow.

36. Laser marking system according to claim 34 or 35, characterized in that the hollow-rib fan unit (11) has a heat exchanger surface for connection to the housing of the marking unit (1).

37. Laser marking system according to at least one of claims 30 to 36, characterized in that the cooling means (11) has a heat exchanger which is integrated into the wall of the housing and / or can be coupled to the housing.

38. Laser marking system according to claim 37, characterized in that the heat exchanger can be operated with a heat exchanger means, in particular water.

39. Laser marking system according to claim 37 or 38, characterized in that the heat exchanger has cooling fins.

40. Laser marking system according to at least one of the preceding claims, characterized in that at least one current source for a pump laser diode (23, 23a, 23b), Q-switch driver, logic driver, power supply for microcomputers and / or another element a DC / DC converter having .

41. Laser marking system according to claim 40, characterized in that the current source for the pump laser diode (23, 23a, 23b) is designed as a controllable current source.

42. Laser marking system according to at least one of the preceding claims, characterized in that the housing of the marking unit has a means, in particular a closable opening for replacing a pump laser diode (23, 23a, 23b) of the laser module (2).

43. Laser marking system according to at least one of the preceding claims, characterized in that at least one pump laser diode (23, 23a, 23b) is arranged in a cartridge 30 as a replacement module.

44. Laser marking system according to at least one of the preceding claims, characterized in that the pump laser diode (23) can be connected to the laser (29) via an optical waveguide (26, 41a, 41b).

45. Laser marking system according to at least one of the preceding claims, characterized in that more than one pump laser diode (23, 23a, 23b) is used, the light of the pump laser diodes (23, 23a, 23b) is guided via waveguides (41a, 41b), wherein the light behind the waveguides is brought together via at least one polarization coupler (41) and at least one deflection mirror (45).

46. Laser marking system according to at least one of the preceding claims, characterized in that at least one waveguide (26, 41a, 41b) from a pump laser diode (23, 23a, 23b) in the housing for extending the waveguide (26, 41a, 41b) as a loop, is formed in particular by a handle of the labeling unit (1).

47. Laser marking system according to at least one of the preceding claims, characterized in that at least one pump laser diode (23, 23a, 23b) dust-tight from the laser space (21) of the laser module

(2) is separated.

48. Laser labeling system according to at least one of the preceding claims, characterized in that more than one labeling unit (1) can be controlled by a computer.

49. Laser marking system according to at least one of the preceding claims, characterized in that at least one labeling unit (1) has at least one plug connection (32a, 32b) for connection to a holding device, in particular with standardized slots.

50. Use of a laser marking system according to at least one of the preceding claims in a device for machining workpieces, in particular a machine tool.

1. Use of a laser marking system according to claim 50, characterized in that the laser marking system is arranged flush with a surface of the device.