EP4078274A1 - Lasersystem zur erzeugung einer linienförmigen lasermarkierung - Google Patents
Lasersystem zur erzeugung einer linienförmigen lasermarkierungInfo
- Publication number
- EP4078274A1 EP4078274A1 EP20817012.6A EP20817012A EP4078274A1 EP 4078274 A1 EP4078274 A1 EP 4078274A1 EP 20817012 A EP20817012 A EP 20817012A EP 4078274 A1 EP4078274 A1 EP 4078274A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- laser
- optics
- optical axis
- laser beam
- cone
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0927—Systems for changing the beam intensity distribution, e.g. Gaussian to top-hat
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01C—MEASURING DISTANCES, LEVELS OR BEARINGS; SURVEYING; NAVIGATION; GYROSCOPIC INSTRUMENTS; PHOTOGRAMMETRY OR VIDEOGRAMMETRY
- G01C15/00—Surveying instruments or accessories not provided for in groups G01C1/00 - G01C13/00
- G01C15/002—Active optical surveying means
- G01C15/004—Reference lines, planes or sectors
Definitions
- the present invention relates to a laser system for generating a linear laser marking according to the preamble of claim 1.
- laser systems In order to carry out leveling or marking work indoors and outdoors, laser systems are known that produce a linear laser marking on a projection surface. With these laser systems, a distinction is made between rotary lasers, which generate the line-shaped laser marking by rotating a beam deflecting lens around an axis of rotation, and line lasers, which generate the line-shaped laser marking using beam-shaping optics, for example a cylinder lens, a prism or a cone mirror. So that the known laser systems can be used without protective measures in the form of protective goggles and reflectors, the laser power must be limited in order to prevent damage to the human eye. For laser systems of laser class 2 or 2M, the maximum permissible laser power is 1 mW.
- known laser systems of laser class 2 or 2M have the disadvantage that the linear laser marking is difficult to see on the projection surface.
- the rule here is that the line-shaped laser marking is less visible the wider the laser marking is on the projection surface, since visibility decreases with decreasing power density.
- the quality of the linear laser marking on the projection surface depends on the distance between the laser system and the projection surface.
- EP 2 411 762 B1 discloses the typical structure of a laser system for generating a linear laser marking with an opening angle of 360 °.
- the laser system comprises a laser beam source that generates a divergent laser beam and emits it along a direction of propagation, a beam-shaping optics designed as collimation optics that converts the divergent laser beam into a collimated laser beam, and a nucleus gel mirror, which is designed as a straight cone with a cone axis and a reflective Mantelflä surface, wherein the cone mirror is arranged in the beam path of the laser beam behind the Kol limationsoptik and the cone axis is aligned coaxially to the optical axis of the Kollima tion optics.
- the laser system known from EP 2411 762 B1 has the disadvantage that no sharply delimited laser marking is generated on the projection surface.
- the laser marking consists of a main line and at least one secondary line.
- the reason for the appearance of several lines is that the laser beam source generates a laser beam with several diffraction orders that are diffracted differently at the tip of the cone mirror and appear as adjacent lines on the projection surface.
- the object of the present invention is to develop a laser system with which a sharply delimited linear laser marking with an opening angle of 360 ° can be generated on a projection surface.
- the laser system is characterized in that the laser system has a second beam shaping optics with a second optical axis, the second beam shaping optics being arranged in the beam path of the laser beam in front of the cone mirror and transforming the laser beam into a ring beam with an intensity minimum in the center of the beam.
- the laser system according to the invention makes it possible to generate a sharply delimited linear laser marking with an opening angle of 360 ° on a projection surface.
- the second beam-shaping optics of the laser system according to the invention converts the laser beam into a ring beam which has an intensity minimum in the center of the beam.
- the minimum intensity of the ring beam offers the possibility of reducing diffraction effects at the cone tip, the reduction of the diffraction effects leading to a sharply delimited linear laser marking.
- the ring beam should be aligned in such a way that the intensity minimum of the ring beam coincides with the cone axis of the cone mirror.
- the second optical axis of the second beam-shaping optics is preferably arranged coaxially to the cone axis of the cone mirror. Due to the coaxial arrangement of the second optical axis and the cone axis, the minimum intensity of the ring beam lies on the cone axis and diffraction effects at the cone tip of the cone mirror are reduced, so that a sharply delimited laser marking is produced on the projection surface.
- the second optical beam shaping system is preferably designed as a diffraction grating.
- the design of the second beam-shaping optics as a diffraction grating has the advantage that the beam shapes can be adapted to the properties of the diffraction grating for example by means of the parameters "grating shape", "grating width” and “grating height” to the wavelength and the beam diameter of the laser beam.
- a straight line is defined as the second optical axis of the diffraction grating which runs through the center of the diffraction structures and is perpendicular to the surface of the diffraction grating.
- the second beam-shaping optics are arranged in the beam path of the laser beam between the laser beam source and the first beam-shaping optics.
- the arrangement of the second beam shaping optics, in particular designed as a diffraction grating, in front of the collimation optics has the advantage that a propagation plane that is not perpendicular to the cone axis behind the cone mirror can be corrected with the aid of the collimation optics. If the collimation optics can be adjusted parallel to the first optical axis, the angle of incidence of the ring beam on the lateral surface of the cone mirror and the alignment of the plane of propagation in which the laser beam runs after the cone mirror can be adjusted
- the first optical beam shaping system is designed to be adjustable parallel to the first optical axis.
- a first optical beam shaping system that can be adjusted parallel to the first optical axis has the advantage that the angle of reflection of the ring beam and the alignment of the plane of propagation in which the laser beam runs after the conical mirror can be changed.
- the aim is to use the cone mirror to create a plane of propagation that is perpendicular to the cone axis.
- the alignment of the plane of propagation is determined by the angle of incidence of the laser beam, which depends on the angle of incidence of the ring beam.
- the second beam-shaping optics are designed parallel to the second optical axis.
- An adjustable second beam shaping optics which can be adjusted parallel to the second optical axis, has the advantage that the angle of incidence of the ring beam and the alignment of the plane of propagation in which the laser beam runs after the cone mirror can be changed.
- the aim is to use the cone mirror to create a propagation plane that is perpendicular to the cone axis.
- the alignment of the plane of spread is determined by the angle of reflection of the laser beam, which depends on the angle of incidence of the ring beam.
- the first beam-shaping optics are designed to be adjustable parallel to the first optical axis and the second beam-shaping optics are designed to be adjustable parallel to the second optical axis.
- a laser system according to the invention in which the first and second beam-shaping optics can be adjusted parallel to the first and second optical axes, respectively, has a larger adjustment range compared to laser systems in which the first or second beam-shaping optics are adjustable.
- the laser system has a third beam-shaping optic, designed as focusing optics, with a third optical axis.
- An optical element is defined as focusing optics, which has a finite focal length and focuses an incident laser beam, the beam diameter of the laser beam being minimal in the focus position.
- the expansion of the laser system according to the invention to include focusing optics has the advantage that the beam diameter of the laser beam can be adapted.
- a focused laser beam has a smaller beam diameter in the area of the focal position than a non-focused laser beam.
- the smaller beam diameter has the advantage that the first beam-shaping optics, second beam-shaping optics and the conical mirror can have smaller dimensions.
- the diffraction grating can have a coarser grating structure, which simplifies the manufacture of the diffraction grating or enables manufacture at lower manufacturing costs.
- the focusing optics are particularly preferably arranged in the beam path of the laser beam in front of the second beam shaping optics.
- the arrangement of the focusing optics in front of the second beam shaping optics which is designed in particular as a diffraction grating, has the advantage that, by focusing the laser beam, diffraction gratings with a coarser grating structure can be used, which simplifies the manufacture of the diffraction grating.
- the laser beam has a smaller beam diameter, as a result of which the first beam-shaping optics, the second beam-shaping optics and the conical mirror can have smaller dimensions.
- the focusing optics are particularly preferably adjustable parallel to the third optical axis.
- a third beam-shaping optics which can be adjusted parallel to the third optical axis, has the advantage that the angle of reflection of the ring beam and the alignment of the propagation plane in which the laser beam runs after the conical mirror can be changed.
- aim is to use the cone mirror to create a plane of propagation that is perpendicular to the cone axis.
- the orientation of the plane of propagation is determined by the angle of incidence of the laser beam, which depends on the angle of incidence of the ring beam.
- the laser beam that the laser beam source generates has a beam distribution in the form of a Gaussian distribution, a Lorentz distribution or a Bessel distribution. These beam distributions do not show an abrupt jump in intensity. An abrupt jump in the intensity, as occurs, for example, with a top hat distribution, leads to undesirable diffraction effects on the conical mirror, which prevent a sharp delimitation of a linear laser marking on a projection surface.
- a laser beam source which generates a laser beam with a beam distribution in the form of a Gaussian distribution, Lorentz distribution or Bessel distribution, supports the generation of a sharply delimited linear laser marking on a projection surface.
- FIG. 1 shows a first embodiment of a laser system according to the invention, which has a laser beam source, a diffraction grating, collimation optics and a cone mirror;
- FIG. 2 shows a second embodiment of a laser system according to the invention, which differs from the first embodiment of the laser system in terms of focusing optics;
- FIG. 3 shows a third embodiment of a laser system according to the invention which has a laser beam source, a diffraction grating, collimation optics and a cone mirror, the collimation optics and the cone mirror being integrated in a common base body;
- FIG. 4 shows a fourth embodiment of a laser system according to the invention, which differs from the third embodiment of the laser system in terms of focusing optics;
- FIGN. 5A, B an embodiment for the diffraction grating of the laser systems of FIG. 1 and FIG. 3.
- FIG. 1 shows a first embodiment of a laser system 10 according to the invention for generating a linear laser marking on a projection surface.
- the laser system 10 which is referred to below as the first laser system 10, comprises a laser beam source 11, a first beam shaping optics 12 with a first optical axis 13, a cone mirror 14 with a cone axis 15 and a second beam shaping optics 16 with a second optical axis 17
- the first beam-shaping optics 12 are designed as collimation optics and the second beam-shaping optics 16 as diffraction grating.
- the components of the first laser system 10 are arranged in the order laser beam source 11, second beam shaping optics 16, first beam shaping optics 12 and cone mirror 14.
- the first optical axis 13 of the first beam-shaping optics 12, the second optical axis 17 of the second beam-shaping optics 16 and the cone axis 15 of the conical mirror 14 are arranged coaxially to one another.
- the laser beam source 11 can be designed as a semiconductor laser with a wavelength in the visible spectrum, for example as a red semiconductor laser with a wavelength of 635 nm or as a green semiconductor laser with a wavelength between 510 and 555 nm.
- the properties of the other optical components 12, 14, 16 of the first laser system 10 are adapted to the wavelength of the laser beam source 11.
- the second Strahlfor mungsoptik 16 is arranged, on which a beam is formed.
- the second beam shaping optics 16 can be designed as a diffraction grating with concentric diffraction structures.
- the properties of the diffraction grating 16 are adapted to the wavelength of the laser beam source 11;
- the laser beam can be reshaped using the parameters "grating shape", "grating width” and "grating height” of the diffraction grating.
- the second optical axis 17 of the diffraction grating 16 is a straight line which runs through the center of the concentric diffraction structures and is perpendicular to the surface of the diffraction grating 16.
- the first Strahlfor mungsoptik 12 designed as collimation optics is arranged, on which a beam is formed.
- the collimation optics 12 have a planar entry surface 18 and a curved exit surface 19.
- the entry surface 18 can be designed as a curved surface and the exit surface 19 as a flat surface, or the entry and exit surfaces 18, 19 are designed as curved surfaces.
- a straight line is defined as the first optical axis 13 of the collimation optics 12, which runs through the center of curvature of the curved surface and is perpendicular to the plane surface or, in the case of two curved surfaces, runs through the centers of curvature of the curved surfaces.
- Each beam-shaping optic has an optical axis, the alignment of which depends on the light-refracting entrance surface and the light-refracting exit surface.
- the optical axis is defined as a straight line which runs through the first center of curvature of the first surface and through the second center of curvature of the second surface.
- the optical axis is defined as a straight line that runs through the center of curvature of the curved surface and perpendicular to the flat surface.
- the conical mirror 14 is arranged behind the collimation optics 12.
- the conical mirror 14 is designed as a section of a straight cone.
- a cone is delimited by a base and a lateral surface, the base being arranged perpendicular to the cone axis in the case of a straight cone.
- the surface of the conical mirror 14 comprises a circular base surface 21, a lateral surface 22 and a cone tip 23, the cone axis 15 being arranged perpendicular to the base surface 21 and running through the cone tip 23.
- the man telS 22 is formed for the wavelength of the laser beam source 11 as a reflective jacket surface and a laser beam impinging on the jacket surface 22 is mainly reflected on the Mantelflä surface 22.
- the degree of reflection of the lateral surface 22 depends, among other things, on the angle of incidence and the polarization of an impinging laser beam and on the refractive index of the conical mirror 15.
- the laser beam source 11 generates a divergent laser beam 25 which is emitted along a direction of propagation 26 and is directed onto the diffraction grating 16. Without an additional optical element in the laser beam source 11, the laser beam 25 is divergent.
- the axis of symmetry of the beam distribution is defined as the optical axis 27 of the laser beam 25.
- the laser beam 25 has a beam distribution in the form of a Gaussian distribution, a Lorentz distribution or a Bessel distribution. These beam distributions do not have an abrupt jump in intensity and support the generation of a sharply delimited linear laser marking on a projection surface.
- the divergent laser beam 25 strikes the diffraction grating 16, which transforms the laser beam 25 into a divergent ring beam 28 with an intensity minimum in the center of the beam.
- the diffraction grating 16 can be designed in such a way that the zeroth diffraction order of the laser beam and the higher straight diffraction orders are suppressed.
- the diffraction grating 16 can be designed in such a way that the first order of diffraction of the laser beam is amplified and the other orders of diffraction are suppressed.
- the divergent ring beam 28 hits the collimation optics 12, which transform the divergent ring beam 28 into a collimated ring beam 29 which is directed onto the conical mirror 14.
- the collimated ring beam 29 hits the lateral surface 22 of the conical mirror 14.
- the collimated ring beam 29 is deflected on the lateral surface 22 of the conical mirror 14 and the conical mirror 14 generates a laser beam 31, which spreads in a propagation plane 32 and on a projection surface 33 a linear laser marking 34 is generated with an opening angle of 360 °.
- the optical axis 27 of the laser beam 25, the second optical axis 17 of the second beam shaping optics 16, the first optical axis 13 of the first beam shaping optics 12 and the cone axis 15 of the conical mirror 14 are arranged coaxially to one another. Due to the coaxial arrangement of the components of the first laser system 10, the intensity minimum of the ring beam 28 lies on the cone axis 15 and diffraction effects at the cone tip 23 of the cone mirror 14 are reduced.
- the angle of incidence of the laser beam should meet the condition of total reflection.
- the reflected portion can alternatively or additionally be increased by providing the jacket surface 22 with a highly reflective coating. The higher the reflected portion of the laser beam, the greater the intensity and the better the visibility of the linear laser marking 34 on the projection surface 33.
- the collimation optics 12 are arranged behind the diffraction grating 16.
- the collimation optics 12 can also be arranged in front of the diffraction grating 16.
- the arrangement of the collimation optics 12 behind the diffraction grating 16 has the advantage that a propagation plane 32 that is not perpendicular to the cone axis 15 and in which the laser beam 31 runs after the cone mirror 14 can be corrected with the aid of the collimation optics 12.
- the alignment of the plane of propagation 32 is determined by the exit angle of the laser beam 31, which depends on the entrance angle of the collimated ring beam 29 on the lateral surface 22 of the conical mirror 14.
- the entrance angle of the ring jet 29 can be changed by the position of the collimation optics 12.
- the collimation optics 12 is parallel to the first optical axis 13 is adjustable out forms.
- FIG. 2 shows a second embodiment of a laser system 40 according to the invention for generating a linear laser marking on a projection surface.
- the laser system 40 of FIG. 2 which is referred to below as the second laser system 40, differs from the first laser system 10 of FIG. 1 by a third beam-shaping optics 41 with a third optical axis 42, the third beam-shaping optics 41 in the exemplary embodiment being designed as focusing optics.
- the second laser system 40 comprises the laser beam source 11, the first beam shaping optics 12 with the first optical axis 13, the cone mirror 14 with the cone axis 15, the second beam shaping optics 16 with the second optical axis 17 and the third beam shaping optics 41 with the third optical axis 42
- the components of the second laser system 40 are arranged in the order laser beam source 11, third beam shaping optics 41, second beam shaping optics 16, first beam shaping optics 12 and cone mirror 14. Since the first optical axis 13 of the first beam-shaping optics 12, the second optical axis 17 of the second beam-shaping optics 16 and the cone axis 15 of the conical mirror 14 are arranged coaxially to one another.
- the laser beam source 11 generates the divergent laser beam 25, which is emitted along the propagation direction 26 and is directed onto the focusing optics 41.
- the divergent laser beam 25 strikes the focusing optics 41, which generate a focused laser beam 43 with a focus position 44.
- the focused laser beam 43 strikes the diffraction grating 16, which transforms the laser beam 43 into an annular beam 45 with an intensity minimum in the center of the beam, the center of the beam corresponding to the optical axis 46 of the annular beam 45.
- the ring beam 45 strikes the collimation optics 12, which transform the ring beam 45 into a collimated ring beam 47 with an optical axis 48, which is directed onto the conical mirror 14.
- the collimated ring beam 47 is deflected around the lateral surface 22 of the conical mirror 14 and the conical mirror 14 generates a laser beam 51, which spreads in a propagation plane 52 and generates a linear laser marking 54 with an opening angle of 360 ° on a projection surface 53.
- the focusing optics 41 are designed to be adjustable parallel to the third optical axis 42.
- a focusing optics 41 which can be adjusted parallel to the third optical axis 42, has the advantage that the angle of reflection of the ring beam 47 and the alignment of the plane of propagation 52 in which the laser beam runs after the conical mirror 14 can be changed. the goal is it to generate a plane of propagation 52 with the conical mirror 14, which is perpendicular to the gel axis 15 Ke.
- the orientation of the plane of propagation 52 is determined by the angle of emergence of the laser beam, which depends on the angle of incidence of the ring beam 47.
- FIG. 3 shows a third embodiment of a laser system 60 according to the invention for generating a linear laser marking on a projection surface.
- the laser system 60 which is referred to below as the third laser system 60, comprises a laser beam source 61, a first beam shaping optics 62 with a first optical axis 63, a cone mirror 64 with a cone axis 65, and a second beam shaping optics 66 with a second optical axis 67.
- the first beam-shaping optics 62 are designed as collimation optics and the second beam-shaping optics 66 as a diffraction grating.
- the components of the third laser system 60 are arranged in the order laser beam source 61, second beam shaping optics 66, first beam shaping optics 62 and cone mirror 64.
- the first optical axis 63 of the first beam-shaping optics 62, the second optical axis 67 of the second beam-shaping optics 66 and the cone axis 65 of the cone mirror 64 are arranged coaxially to one another.
- the collimation optics 62 and the conical mirror 64 are integrated into a common base body 68 which is designed in the form of a straight cylinder.
- a cylinder is delimited by two parallel, flat surfaces, which are referred to as the base surface and the top surface, and a peripheral surface; in the case of a straight cylinder, the base and top surface are arranged perpendicular to a cylinder axis.
- the surface of the base body 68 comprises a base surface 71, a top surface 72 which is arranged parallel to the base surface 71, and a lateral surface 73 which connects the base and top surface 71, 72; the base and cover surfaces 71, 72 run perpendicular to a cylinder axis 74 of the base body 68.
- the base surface 71, the top surface 72 and the lateral surface 73 are designed as transmission surfaces for the wavelength of the laser beam source 61.
- the transmittance of a transmission surface depends, among other things, on the angle of incidence and the polarization of the laser beam as well as the refractive indices of the materials.
- the degree of transmission can be increased by providing the transmission surface with a coating. The higher the transmitted portion of the laser beam, the greater the intensity and the better the visibility of the laser beam on a projection surface.
- the collimation optics 62 are connected to the base surface 71 of the base body 68 and the conical mirror 64 is integrated as a conical cutout into the top surface 72 of the base body 68.
- the base body 68 with the connected collimation optics 62 and the integrated th conical mirror 64 can be made monolithically from one material.
- glass and plastics are suitable for the base body 68.
- the collimation optics 62 is designed as an aspherically curved lens in the embodiment;
- the aspherical curvature of the collimation optics 62 can be produced in the case of glass by diamond turning, replica, grinding and polishing or by pressing at high temperatures from a glass molding and in the case of plastic by injection molding or injection compression molding.
- the surface of the conical cutout comprises a circular base 76 which is arranged perpendicular to the cone axis 65, a lateral surface 77 adjoining the base 76 and a cone tip 78.
- the base 76 is arranged on the top surface 72 of the base 68 and the cone axis 65 is collinear to the cylinder axis 74, so that the cone tip 78 lies on the cylinder axis 74.
- the lateral surface 77 of the conical cutout 75 is designed as a reflection surface for the wavelength of the laser beam source 61.
- the degree of reflection of the lateral surface 77 depends, among other things, on the angle of incidence and the polarization of the laser beam and on the refractive index of the base body 68. So that the incident laser beam is reflected as completely as possible on the lateral surface 77, the angle of incidence should meet the condition of total reflection.
- the reflected portion can alternatively or additionally be increased by providing the jacket surface 77 with a highly reflective coating. The higher the reflected portion of the laser beam, the greater the intensity and the better the visibility of the linear laser marking on the projection surface.
- the collimation optics 62 are integrated into the base area 71 of the base body 68.
- the collimation optics 62 have a curved entry surface 81 and a planar exit surface 82.
- a straight line is defined as the first optical axis 63 of the collimation optics 62, which runs through the center of curvature of the curved surface and is perpendicular to the plane surface.
- the laser beam source 61 generates a divergent laser beam 83, which propagates along a direction of propagation 84 and is directed onto the diffraction grating 66.
- the axis of symmetry of the beam distribution is defined as the optical axis 85 of the laser beam.
- the laser beam 83 has a beam distribution in the form of a Gaussian distribution, a Lorentz distribution or a Bessel distribution. These beam distributions do not have an abrupt jump in intensity and support the generation of a sharply delimited linear laser marking on a projection surface.
- the divergent laser beam 83 strikes the diffraction grating 66, which transforms the laser beam 83 into a ring beam 86 with an intensity minimum in the center of the beam, the center of the beam corresponding to the optical axis 87 of the ring beam 86.
- the divergent ring beam 86 propagates along the direction of propagation 84 and hits the collimation optics 62.
- the collimation optics 62 converts the divergent ring beam 86 into a collimated ring beam 88 with an optical axis 89, which is directed onto the cone mirror 64.
- the collimated ring beam 88 is deflected on the lateral surface 77 of the conical mirror 64 and the conical mirror 64 generates a laser beam 91 which propagates in a plane 92 of propagation.
- the laser beam 91 strikes the lateral surface 77 of the base body 68 and leaves the base body 68.
- the laser beam 91 strikes a projection surface 93 and generates a linear laser marking 94 with an opening angle of 360 °.
- FIG. 4 shows a fourth embodiment of a laser system 100 according to the invention for generating a linear laser marking on a projection surface.
- the laser system 100 of FIG. 4 which is referred to below as the fourth laser system 100, differs from the third laser system 60 of FIG. 3 by a third beam-shaping optics 101 with a third optical axis 102, the third beam-shaping optics 101 in the exemplary embodiment being designed as focusing optics.
- the fourth laser system 100 comprises the laser beam source 61, the first beam shaping optics 62 with the first optical axis 63, the cone mirror 64 with the cone axis 65, the second beam shaping optics 66 with the second optical axis 67 and the third beam shaping optics 101 with the third optical axis 102
- the components of the fourth laser system 100 are arranged in the order laser beam source 61, third beam shaping optics 101, second beam shaping optics 66, first beam shaping optics 62 and cone mirror 64.
- the first optical axis 63 of the first beam-shaping optics 62, the second optical axis 67 of the second beam-shaping optics 66 and the third optical axis 102 of the third beam-shaping optics 101 are arranged coaxially to one another.
- the laser beam source 61 generates the divergent laser beam 83, which is emitted along the direction of propagation 84 and is directed onto the focusing optics 101.
- the divergent laser beam 83 strikes the focusing optics 101, which generate a focused laser beam 103 with a focus position 104.
- the focused laser beam 103 hits the diffraction grating 66, which transforms the laser beam into a ring beam 105 with an intensity minimum in the center of the beam, the center of the beam corresponding to the optical axis 106 of the ring beam 105.
- the divergent ring beam 105 strikes the collimation optics 62, which convert the divergent ring beam 105 into a collimated ring beam 107 with an optical axis 108, which is directed onto the conical mirror 64.
- the collimated ring beam 107 is deflected on the lateral surface 77 of the conical mirror 64 and the conical mirror 64 generates a laser beam 111 which propagates in a plane of propagation 112.
- the laser beam 111 strikes the lateral surface 77 of the base body 68 and leaves the base body 68.
- the laser beam 111 strikes a projection surface 113 and generates a linear laser marking 114 with an opening angle of 360 °.
- the focusing optics 101 are designed to be adjustable parallel to the third optical axis 102.
- a focusing optics 101 which can be adjusted parallel to the third optical axis 102, has the advantage that the angle of reflection of the ring beam 107 and the alignment of the propagation plane 112, in which the laser beam runs after the conical mirror 64, can be changed.
- the aim is to use the cone mirror 64 to generate a plane of propagation 112 that runs perpendicular to the cone axis 65.
- the orientation of the plane of propagation 112 is determined by the angle of emergence of the laser beam, which depends on the angle of incidence of the ring beam 107.
- FIGN. 5A, B show a diffraction grating 126, which the diffraction grating 16 of the first laser system 10 of FIG. 1 and / or the diffraction grating 66 of the third laser system 60 of FIG. 3 can replace.
- FIG. 5A shows the diffraction grating 126 in a plan view and
- FIG. 5B shows a cross section.
- the task of the diffraction grating 126 is to transform the laser beam, which is emitted by the laser beam source 11, 61, into a ring beam with an intensity minimum in the center of the beam.
- the ring beam then hits a conical mirror, which deflects the ring beam and transforms it into a laser beam that spreads in a plane of propagation.
- the minimum intensity of the ring beam offers the possibility of reducing diffraction effects at the tip of the cone mirror.
- the ring beam should be aligned in such a way that the minimum intensity of the ring beam coincides with the cone tip of the cone mirror.
- the diffraction grating 126 has concentric diffraction structures.
- the properties of the diffraction grating 126 are adapted to the wavelength of the laser beam source 11, 61 and the beam diameter of the laser beam by means of the parameters “grating shape”, “grating width” and “grating height”.
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Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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EP19216511.6A EP3839609A1 (de) | 2019-12-16 | 2019-12-16 | Lasersystem zur erzeugung einer linienförmigen lasermarkierung |
PCT/EP2020/084868 WO2021122100A1 (de) | 2019-12-16 | 2020-12-07 | Lasersystem zur erzeugung einer linienförmigen lasermarkierung |
Publications (1)
Publication Number | Publication Date |
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EP4078274A1 true EP4078274A1 (de) | 2022-10-26 |
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Family Applications (2)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19216511.6A Withdrawn EP3839609A1 (de) | 2019-12-16 | 2019-12-16 | Lasersystem zur erzeugung einer linienförmigen lasermarkierung |
EP20817012.6A Withdrawn EP4078274A1 (de) | 2019-12-16 | 2020-12-07 | Lasersystem zur erzeugung einer linienförmigen lasermarkierung |
Family Applications Before (1)
Application Number | Title | Priority Date | Filing Date |
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EP19216511.6A Withdrawn EP3839609A1 (de) | 2019-12-16 | 2019-12-16 | Lasersystem zur erzeugung einer linienförmigen lasermarkierung |
Country Status (3)
Country | Link |
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US (1) | US20220413309A1 (de) |
EP (2) | EP3839609A1 (de) |
WO (1) | WO2021122100A1 (de) |
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US4111564A (en) * | 1973-02-08 | 1978-09-05 | Trice Jr James R | Reference plane production |
JP2767235B2 (ja) * | 1995-06-09 | 1998-06-18 | 株式会社川口光学産業 | 環状光線拡がり角制御光学装置 |
DE202009018893U1 (de) | 2009-03-26 | 2014-09-11 | Robert Bosch Gmbh | Selbstnivellierendes Mehr-Linien- 360°-Lasergerät |
US8402665B2 (en) * | 2010-09-02 | 2013-03-26 | Kimokeo Inc. | Method, apparatus, and devices for projecting laser planes |
CN104816086B (zh) * | 2015-04-17 | 2016-11-09 | 温州大学 | 一种管道内壁激光加工头 |
KR20170071394A (ko) * | 2015-12-15 | 2017-06-23 | (주)다울아토닉스 | 무회전 무주사 라이다 광원 검출 장치 |
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2019
- 2019-12-16 EP EP19216511.6A patent/EP3839609A1/de not_active Withdrawn
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2020
- 2020-12-07 EP EP20817012.6A patent/EP4078274A1/de not_active Withdrawn
- 2020-12-07 US US17/781,572 patent/US20220413309A1/en active Pending
- 2020-12-07 WO PCT/EP2020/084868 patent/WO2021122100A1/de unknown
Also Published As
Publication number | Publication date |
---|---|
EP3839609A1 (de) | 2021-06-23 |
US20220413309A1 (en) | 2022-12-29 |
WO2021122100A1 (de) | 2021-06-24 |
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