WO1998034789A1 - Vorrichtung zum beschriften von materialien mit einem laser - Google Patents
Vorrichtung zum beschriften von materialien mit einem laser Download PDFInfo
- Publication number
- WO1998034789A1 WO1998034789A1 PCT/DE1998/000447 DE9800447W WO9834789A1 WO 1998034789 A1 WO1998034789 A1 WO 1998034789A1 DE 9800447 W DE9800447 W DE 9800447W WO 9834789 A1 WO9834789 A1 WO 9834789A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- laser
- hand
- unit
- held
- power supply
- Prior art date
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J2/00—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed
- B41J2/435—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material
- B41J2/44—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements
- B41J2/442—Typewriters or selective printing mechanisms characterised by the printing or marking process for which they are designed characterised by selective application of radiation to a printing material or impression-transfer material using single radiation source per colour, e.g. lighting beams or shutter arrangements using lasers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41J—TYPEWRITERS; SELECTIVE PRINTING MECHANISMS, i.e. MECHANISMS PRINTING OTHERWISE THAN FROM A FORME; CORRECTION OF TYPOGRAPHICAL ERRORS
- B41J3/00—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed
- B41J3/36—Typewriters or selective printing or marking mechanisms characterised by the purpose for which they are constructed for portability, i.e. hand-held printers or laptop printers
Definitions
- the invention relates to a device for marking materials with a laser according to the preamble of claim 1.
- a resonator which consists of a so-called pump chamber, two mirrors and an acousto-optical switch, a so-called Q-switch, is arranged in the laser head of the solid-state laser.
- the pump chamber there is a YAG crystal rod and one or more krypton arc lamps, the light of which is imaged in the crystal rod, which emits light of a predetermined wavelength on both end faces. This light is reflected back into the crystal rod by the two mirrors, the mirror at the rear end of the resonator reflecting approx. 99.9%, while the front mirror transmits 12% and thus forms the working beam.
- the Q-Switch interrupts the work beam up to 40,000 times per second and thus generates power peaks up to 1,000 times the continuous wave or cw laser operation.
- the resonator also contains a mechanical switch. (Shutter) for interrupting the laser beam and a holder in which a mode diaphragm is fixed in an application-specific manner in order to achieve a higher beam quality (e.g. in basic mode operation).
- a beam expansion the laser beam leaving the resonator is expanded by a factor of 2 to 10.
- the laser beam expanded in this way is deflected in a deflection unit by means of two galvanometer mirrors in the X and Y directions and focused on a workpiece via a flat field focusing optics.
- Further elements of the known laser marker are a computer for controlling a control device controlling the deflection device, a Q-switch driver and a power supply device.
- An additional, complex cooling device is provided for cooling the pump chamber.
- the known laser marker is designed as a laser system with a coordinate table, a rotary indexing table with an inlet and outlet tunnel and, if appropriate, with a double-head arrangement, as it is also used as a solid-state laser for material processing, that is for cutting, joining, drilling and the like.
- a laser marking system as is also the subject of DE 33 18 768 AI, is voluminous and can therefore only be used in a stationary manner. It also has a considerable power requirement and a low efficiency, since a large part of the power consumed must be dissipated by means of the cooling device to ensure proper operation.
- Such a laser system has considerable dimensions and requires a water connection for cooling the laser and a three-phase connection with a power requirement of approximately 8 kW.
- This laser system requires a great deal of maintenance, since an ion exchanger and a particle filter are required because of the water connection, and high lamp consumption and considerable wear on the pumping chamber have to be accepted.
- a complex adjustment device and a deflection head containing numerous optical components with a diverging and collecting optics of the expansion optics, deflection mirrors and the like are also for such a laser marking system. required, which increase the cost of the production of the known laser marking system and its maintenance and operation.
- the object of the present invention is to provide a device for labeling almost any materials with a laser having a significantly smaller size and weight, as well as optimal handling and maximum mobility with low manufacturing and operating costs, low effort and maintenance and long service life.
- the solution according to the invention creates a mobile device for marking objects with a solid-state laser, which are characterized by small dimensions and low weight and by a simple structure.
- the labeling device can be configured variably both with regard to the data input and also with regard to the output head with any additional devices, such as a digital video camera, a CCD image converter, a scanner and the like. get connected .
- any configuration of the marking laser can be created for an application-oriented structure.
- the labeling device consists of a hand-held device which contains a deflection unit and a solid-state laser and which is connected via a cable connection to a carrying device which has a control device and a power supply device, for example an accumulator and / or a power supply unit.
- a control device and a power supply device for example an accumulator and / or a power supply unit.
- an interface is provided for connecting the control device to an external control and / or input unit.
- the handheld device contains only the deflection unit and is connected via a glass fiber cable to a carrying device which contains the solid-state laser, the control device and the power supply device, an interface for a connection of the control device to the external control and / or input unit is provided.
- all assemblies can be combined in one housing, which is designed as a hand-held device or table-top device.
- the dimensions are so compact that the hand-held device, for example, in the form of a pistol, and the carrying device can be accommodated in a housing which can be connected to an operator via a hip and / or shoulder strap.
- the hand-held device for example, in the form of a pistol
- the carrying device can be accommodated in a housing which can be connected to an operator via a hip and / or shoulder strap.
- the handheld device is particularly advantageous to connect the handheld device to a scanning unit, for example a scanner, a video camera or a digital camera.
- a scanning unit for example a scanner, a video camera or a digital camera.
- This enables, for example, that an image is recorded with the scanning unit and can be applied to an object by means of the hand-held device.
- the device is therefore preferably suitable for managing a warehouse in which goods are stored which are provided with a barcode for identification.
- the barcodes are read by means of the scanner, forwarded to a computer arranged in the hand-held device or to a further, higher-level central computer and processed there. If the barcode needs to be changed, the old barcode can easily be made unrecognizable or destroyed using the handheld device and the new barcode can be applied to the goods.
- a recording unit for the objects to be labeled, in which a distance measuring device for emitting a distance measuring signal controlling the focusing of the laser beam and a switching device for releasing the laser beam are arranged when the object to be labeled is correctly positioned.
- a mechanical stop for static focusing of the laser beam is provided.
- a recording unit for objects to be labeled ensures secure positioning of the object to be labeled in the focal plane of the laser beam and safe handling of the labeling device.
- a lens system for example a lens system of an autofocus camera, is provided for setting the focus distance.
- control device is wirelessly connected to an external control and / or input unit via a radio, infrared or ultrasound transmission and reception unit.
- control device and, if appropriate, parts of the power supply device are constructed from film circuits using SMD techniques and are therefore particularly suitable for a compact design and for accommodating them in component housings which can be worn on the body of the operator.
- the laser consists of a solid-state laser that is longitudinally pumped with a laser diode and that contains a laser bank with a laser crystal, a Q-Switch, a highly reflective resonator mirror, and an output mirror, with the laser crystal preferably having no or one has the lowest possible voltage birefringence and also has a long fluorescence lifetime with the smallest possible dimensions.
- the solid-state laser is optionally equipped with an active Q-switch, i.e. with an optoacoustic crystal, or with a passive Q-switch and a laser diode, which is operated in pulsed mode, among other things.
- an active Q-switch i.e. with an optoacoustic crystal
- a passive Q-switch and a laser diode which is operated in pulsed mode, among other things.
- the laser diode preferably has the highest possible efficiency.
- the laser diode is cooled with a cooling element, for example with a Peltier element. It is envisaged both Laser diode driver as well as the Peltier driver to be arranged either in the handheld device or in the carrying device. "Driver” is understood to mean the corresponding supply board of a component.
- the individual laser components are preferably arranged very compactly with respect to one another in order to achieve a minimum dimension that ensures mobile handling.
- the short resonator geometry is used, so that very short laser pulses and thus a high pulse peak power are generated.
- the short resonator geometry is preferably made available by a folded beam path by means of a corresponding mirror arrangement, for example two mirrors arranged at 45 ° to the beam axis.
- the device also has optics for beam expansion, preferably by means of two lenses.
- the beam expansion is provided by a further mirror system consisting of at least two mirrors, which preferably also has a folded beam path due to multiple reflections.
- polarizers are provided in order to generate polarized laser light.
- This light can also be generated by the laser crystal itself.
- the device according to the invention preferably has at least one optic with high diffraction efficiency, in particular re a crystal, which efficiently interrupts the laser process in the resonator while at the same time having low high-frequency power input.
- the elements of the device according to the invention of fiber composite materials, ceramic or plastic are made.
- the optics are assembled and / or attached using adhesive.
- a drive unit of a read / write head of a data memory in particular a magnetic or optical data memory, is used as the motor of the drive unit with which the deflection unit is adjusted.
- the invention is by no means restricted to this type of drive unit. Rather, conventional drive units, for example galvanometer scanners, can also be used as drive units for the deflection unit.
- Fig. 1 - a schematic block diagram of a hand laser marking device with a solid-state laser arranged in a carrying device
- FIG. 2 shows a schematic block diagram of a hand laser marking device with a solid-state laser arranged in the hand-held device
- 3 shows a schematic representation of an operator with a hand-held device and a carrying device arranged on a hip belt;
- Fig. 4 is a schematic block diagram of a hand laser marking device with wireless signal input.
- Fig. 5 possible mirror arrangements to shorten the resonator length.
- FIGS. 1 and 2 The schematic block diagrams of devices for labeling objects with a solid-state laser shown in FIGS. 1 and 2 are composed of a different grouping of identical components. They can be supplemented by further exemplary embodiments which consist of groups of the same type, for example the combination of all of the assemblies in a laser-marking device provided with a housing, which is designed in the form of a tabletop device as a mobile marking station.
- labeling 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.
- FIG. 1 shows the block diagram of a compact hand-held laser marking device, which is composed of a hand-held device 1 and a one- or two-part carrying device 2.
- the handheld device 1 contains a deflection unit 7, which is in front of the object to be labeled is placed or which can be connected to a recording unit for recording and adjusting the object to be labeled.
- the hand-held device 1 contains a scanning unit 8, which can consist, for example, of a scanner, a CCD image converter or a digital video camera.
- the carrying device 2 contains a control device 21, a solid-state laser 4 and a power supply device 22, which is connected to the units of the carrying device.
- the control device 21 has a microprocessor 11, an HF generator 12, a read / write memory or some other type of storage medium 13, signal amplifier 200 for amplifying the control signals for the mirror adjustments (galvanometer scanner) located in the deflection unit 7 as well as an input and Monitoring unit 14, while the solid-state laser 4 is composed of a laser bank 5 (or another mechanically stable construction of the laser components) and a laser diode 6.
- the laser bank 5 contains a longitudinally or transversely pumped laser crystal 50, a Q-switch 51 (active or passive Q-switch) as well as a highly reflective resonator mirror 52 and a coupling-out mirror 53.
- the signal amplifier 200 may be omitted, since the drive unit of the read / write head already has such signal amplifiers.
- the output of the solid-state laser 4 is connected to the deflection unit 7 via a glass fiber cable 17.
- the fiber optic cable 17 can be combined with an electrical cable that connects connecting lines 31 between the microprocessor 11 and the scanning unit 8, the microprocessor 11 and the deflection unit 7 and a power supply cable for connecting contains the power supply device 22 with the handheld device 1. If the control device 21 and the solid-state laser 4 are arranged separately from the power supply device 22, for example in different housings or parts of a housing, an additional power supply cable must be provided between the control device 21 and the solid-state laser 4 on the one hand and the power supply device 22 on the other hand.
- the power supply device 22 is composed of an accumulator 9 and a power pack 10.
- the driver of a Peltier element (not shown) intended for cooling is also arranged in this power supply device.
- An external control and monitoring unit 3 is connected via an interface 15 to the microprocessor 11 of the control device 21 for the input of any data.
- an external control and monitoring unit 3 which can be connected to the control device 21 via a cable
- wireless transmission is also possible, so that instead of a plug connection as the interface 15 an electromagnetic, electro-optical or electro-acoustic transmission of signals between an external control and monitoring unit and the control device 21 can be provided.
- data can be entered directly using a miniature laptop, for example.
- the solid-state laser 4 consists of a solid-state laser pumped longitudinally or transversely with the laser diode 6, the laser bank 5 of which does not contain any polarizers in order to increase the efficiency and thus maximize the power output.
- a crystal with no or the lowest possible stress birefringence, which has minimal dimensions, is used as the laser crystal 50.
- the laser bench 5 can be constructed extremely compact, since with low power consumption, there is only a small heat output.
- the laser bank 5 can optionally be pumped continuously with an active Q-switch (HF source) using an optoacoustic crystal or with a passive Q-switch.
- HF source active Q-switch
- a further increase in the compactness of the labeling device according to the invention can be achieved by using a folded beam path with mirrors and the like. in the deflection unit 7 or in the laser head, so that a portable laser marking device with the smallest possible external dimensions and weight is created.
- a variant of a laser marking device shown as a block diagram in FIG. 2 combines the combination of the solid-state laser 4 with the deflection unit 7 in a hand-held device 1 and the combination of the control device 21 with the power supply device 22 in a carrying device 2.
- the control and supply device is connected to the handheld device 1 via an electrical line 18.
- a further connection is provided via an interface 15 with an external control and monitoring unit 3 and with a scanning unit 8, which can consist of a digital (video) camera, a CCD image converter or a scanner, analogously to the exemplary embodiment according to FIG. 1 .
- the scanning unit 8 can also be coupled to the hand-held device 1 analogously to the arrangement according to FIG. 1, so that the hand-held device 1 can also be used for signal recording.
- Signal amplifier for amplifying the control signals for the mirror adjustments located in the deflection unit 7.
- FIG. 3 shows a schematic sketch of the use of the hand laser marking device according to the invention and its composition of a handheld device 1 and a carrying device 2, which in this embodiment can be fastened around the waist of an operator in connection with a hip belt or lap belt 16.
- Alternative types of attachment of the carrying device are a backpack shape with a carrying device to be fastened on the back and side (belt) attachments.
- connection between the handheld device 1 and the carrying device 2 is established via a cable connection 17, 18, which optionally consists of a glass fiber cable and / or an electrical connection cable.
- the hand-held device 1 can be coupled, for example, to a video camera 80, which can be used to take pictures of objects or people for signal input, which are processed further via the signal processing of the control device for controlling the solid-state laser and the deflection unit.
- a video camera 80 which can be used to take pictures of objects or people for signal input, which are processed further via the signal processing of the control device for controlling the solid-state laser and the deflection unit.
- the hand-held device 1 contains the deflection unit 7 and possibly the scanning unit 8 or 80, while in this embodiment the carrying device 2 contains the solid-state laser, the control device and the power supply device.
- the hand-held device 1 has the laser arrangement and the deflection unit 7, possibly in conjunction with a scanning element, while the carrying device 2 has the control device and the power supply furnishing contains.
- a connection 15 of the carrying device 2 is provided for the connection 17, 18 to the handheld device and for an external control and monitoring unit.
- film circuits in conjunction with SMD components, so that the carrying device 2 can be placed comfortably around the waist of an operator.
- multilayer arrangements with SMD components can also be provided.
- the variant of a hand-held laser marking device shown in FIG. 4 as a block diagram has the combination of a semiconductor laser with a laser diode 6 and a collimator lens 55 and the control device with a processor 11 and a memory element 13 in a carrying device.
- the power supply device 9 (accumulator) is either coupled to the carrying device or attached as a separate carrying device.
- the handheld device 1 contains a deflection unit 7 with two deflection mirrors. Furthermore, a scanning unit 8 can be connected to the handheld device 1 analogously to the embodiment according to FIG. 1.
- the signal can be input both via the scanning unit and via a wireless connection from an external data input device 3.
- a radio, infrared or ultrasound transmission and reception unit is provided, which is connected to a transmission and reception element 19 on the control device side.
- a corresponding transmission and reception element is provided on the external control device 3.
- Figures 5a to 5d each show the resonator, which consists of the crystal 50 and the 99.9% reflecting mirror 52 and the exit mirror 53, which reflects approximately 88% of the light and transmits 12% of the light.
- FIG. 5a An arrangement of the resonator elements which has been conventionally used to date is shown in FIG. 5a.
- the two mirrors 52 and 53 and the crystal 50 are arranged one behind the other in such a way that the laser beam emerges straight from the exit mirror 53 without deflection.
- the resonator according to FIG. 5b has, in addition to the resonator elements already mentioned, a mirror 100 which is arranged at an angle of 45 ° to the beam axis. With this arrangement, the laser beam is deflected by 90 ° before it emerges through the exit mirror 53. The deflection results in a folded beam path, which enables a more compact design of the resonator and thus a further increase in the compactness of the hand laser marking device.
- this effect is further intensified in that the laser beam deflected according to FIG. 5b is deflected again by 90 ° by a further mirror 101 arranged at an angle of 45 ° to the beam axis before it is mirrored exit.
- FIG. 5c shows 5d.
- a Q-switch 51 active or passive Q-switching
- a shutter 103 the ter for releasing the laser beam at correc ⁇ positioning of serving to be labeled object, arranged.
- a mirror system 300 consisting of two mirrors 301 and 302 for expanding the laser beam is arranged behind the shutter 103. The laser beam incident in the mirror system 300 is only coupled out again after multiple reflections at the two mirrors 301 and 302.
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- Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Lasers (AREA)
- Laser Beam Processing (AREA)
- Non-Silver Salt Photosensitive Materials And Non-Silver Salt Photography (AREA)
- Dot-Matrix Printers And Others (AREA)
- Laser Surgery Devices (AREA)
- Radiation-Therapy Devices (AREA)
- Electronic Switches (AREA)
- Facsimile Heads (AREA)
Abstract
Description
Claims
Priority Applications (9)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IL13110098A IL131100A0 (en) | 1997-02-06 | 1998-02-06 | Device for laser writing on materials |
EP98912243A EP0961688B1 (de) | 1997-02-06 | 1998-02-06 | Vorrichtung zum beschriften von materialien mit einem laser |
AU67178/98A AU6717898A (en) | 1997-02-06 | 1998-02-06 | Device for laser writing on materials |
AT98912243T ATE200649T1 (de) | 1997-02-06 | 1998-02-06 | Vorrichtung zum beschriften von materialien mit einem laser |
CA002279307A CA2279307A1 (en) | 1997-02-06 | 1998-02-06 | Device for laser writing on materials |
US09/367,018 US6700094B1 (en) | 1997-02-06 | 1998-02-06 | Device for laser writing on materials |
DE59800640T DE59800640D1 (de) | 1997-02-06 | 1998-02-06 | Vorrichtung zum beschriften von materialien mit einem laser |
JP53357698A JP2001510409A (ja) | 1997-02-06 | 1998-02-06 | レーザを備えた物体への書込装置 |
NO993786A NO993786L (no) | 1997-02-06 | 1999-08-05 | Anordning til paaskrivning av materialer med en laser |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19706038.2 | 1997-02-06 | ||
DE19706038A DE19706038A1 (de) | 1997-02-06 | 1997-02-06 | Vorrichtung zum Beschriften von Materialien mit einem Laser |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1998034789A1 true WO1998034789A1 (de) | 1998-08-13 |
Family
ID=7820493
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/DE1998/000447 WO1998034789A1 (de) | 1997-02-06 | 1998-02-06 | Vorrichtung zum beschriften von materialien mit einem laser |
Country Status (12)
Country | Link |
---|---|
US (1) | US6700094B1 (de) |
EP (1) | EP0961688B1 (de) |
JP (1) | JP2001510409A (de) |
KR (1) | KR20000070852A (de) |
CN (1) | CN1246826A (de) |
AT (1) | ATE200649T1 (de) |
AU (1) | AU6717898A (de) |
CA (1) | CA2279307A1 (de) |
DE (2) | DE19706038A1 (de) |
IL (1) | IL131100A0 (de) |
NO (1) | NO993786L (de) |
WO (1) | WO1998034789A1 (de) |
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JPS6147684A (ja) * | 1984-08-13 | 1986-03-08 | Canon Inc | レ−ザ−共振装置 |
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- 1998-02-06 JP JP53357698A patent/JP2001510409A/ja not_active Ceased
- 1998-02-06 US US09/367,018 patent/US6700094B1/en not_active Expired - Fee Related
- 1998-02-06 CN CN98802368A patent/CN1246826A/zh active Pending
- 1998-02-06 KR KR1019997007117A patent/KR20000070852A/ko not_active Application Discontinuation
- 1998-02-06 WO PCT/DE1998/000447 patent/WO1998034789A1/de not_active Application Discontinuation
- 1998-02-06 AT AT98912243T patent/ATE200649T1/de not_active IP Right Cessation
- 1998-02-06 AU AU67178/98A patent/AU6717898A/en not_active Abandoned
- 1998-02-06 EP EP98912243A patent/EP0961688B1/de not_active Expired - Lifetime
- 1998-02-06 IL IL13110098A patent/IL131100A0/xx unknown
- 1998-02-06 DE DE59800640T patent/DE59800640D1/de not_active Expired - Fee Related
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Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US6721241B1 (en) | 1996-12-27 | 2004-04-13 | Compact Laser Solutions Gmbh | Optical information system with motor controlled reflector means in a swivel arm |
WO2000076714A1 (de) | 1999-06-11 | 2000-12-21 | Chromatron Laser Systems Gmbh | Laserbeschriftungssystem und verwendung in einer vorrichtung zur bearbeitung eines werkstücks |
DE19928084C2 (de) * | 1999-06-11 | 2003-03-27 | Compact Laser Solutions Gmbh | Transportables Laserbeschriftungssystem |
WO2005058536A1 (en) * | 2003-12-18 | 2005-06-30 | Retainagroup Limited | Portable laser apparatus for marking an object |
US7397014B2 (en) | 2003-12-18 | 2008-07-08 | Retainagroup Limited | Portable laser apparatus for marking an object |
WO2021094476A1 (de) * | 2019-11-13 | 2021-05-20 | Trumpf Schweiz Ag | Handgerät mit einem markierungslaser und einer markierungsleseeinrichtung |
Also Published As
Publication number | Publication date |
---|---|
KR20000070852A (ko) | 2000-11-25 |
ATE200649T1 (de) | 2001-05-15 |
EP0961688B1 (de) | 2001-04-18 |
EP0961688A1 (de) | 1999-12-08 |
DE19706038A1 (de) | 1998-08-20 |
US6700094B1 (en) | 2004-03-02 |
NO993786L (no) | 1999-10-05 |
CN1246826A (zh) | 2000-03-08 |
NO993786D0 (no) | 1999-08-05 |
JP2001510409A (ja) | 2001-07-31 |
AU6717898A (en) | 1998-08-26 |
CA2279307A1 (en) | 1998-08-13 |
DE59800640D1 (de) | 2001-05-23 |
IL131100A0 (en) | 2001-01-28 |
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