WO2022210995A1 - レーザ走査装置、レーザ走査方法、レーザ加工装置及び電磁鋼板の製造方法 - Google Patents
レーザ走査装置、レーザ走査方法、レーザ加工装置及び電磁鋼板の製造方法 Download PDFInfo
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- WO2022210995A1 WO2022210995A1 PCT/JP2022/016369 JP2022016369W WO2022210995A1 WO 2022210995 A1 WO2022210995 A1 WO 2022210995A1 JP 2022016369 W JP2022016369 W JP 2022016369W WO 2022210995 A1 WO2022210995 A1 WO 2022210995A1
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- laser beam
- mirror
- laser
- steel sheet
- polygon mirror
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- 238000000034 method Methods 0.000 title claims description 47
- 238000004519 manufacturing process Methods 0.000 title claims description 11
- 229910000976 Electrical steel Inorganic materials 0.000 title abstract description 9
- 230000003287 optical effect Effects 0.000 claims abstract description 51
- 229910000831 Steel Inorganic materials 0.000 claims description 160
- 239000010959 steel Substances 0.000 claims description 160
- 230000008569 process Effects 0.000 claims description 21
- 230000000149 penetrating effect Effects 0.000 claims description 6
- 230000001678 irradiating effect Effects 0.000 claims description 3
- 230000004048 modification Effects 0.000 description 21
- 238000012986 modification Methods 0.000 description 21
- 230000000052 comparative effect Effects 0.000 description 16
- 230000000694 effects Effects 0.000 description 11
- 238000003672 processing method Methods 0.000 description 11
- 238000000137 annealing Methods 0.000 description 8
- 238000001953 recrystallisation Methods 0.000 description 8
- 230000008859 change Effects 0.000 description 7
- 239000010960 cold rolled steel Substances 0.000 description 7
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 6
- 230000009471 action Effects 0.000 description 6
- 238000000576 coating method Methods 0.000 description 5
- 238000010586 diagram Methods 0.000 description 5
- 238000005097 cold rolling Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 229910052742 iron Inorganic materials 0.000 description 3
- 230000005381 magnetic domain Effects 0.000 description 3
- 230000007246 mechanism Effects 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 229910001224 Grain-oriented electrical steel Inorganic materials 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000005261 decarburization Methods 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 238000005098 hot rolling Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 239000007769 metal material Substances 0.000 description 1
- 239000013307 optical fiber Substances 0.000 description 1
- 238000005096 rolling process Methods 0.000 description 1
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/08—Devices involving relative movement between laser beam and workpiece
- B23K26/082—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head
- B23K26/0821—Scanning systems, i.e. devices involving movement of the laser beam relative to the laser head using multifaceted mirrors, e.g. polygonal mirror
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/0006—Working by laser beam, e.g. welding, cutting or boring taking account of the properties of the material involved
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
- B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
- B23K26/064—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms
- B23K26/0643—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
- B23K26/359—Working by laser beam, e.g. welding, cutting or boring for surface treatment by providing a line or line pattern, e.g. a dotted break initiation line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/362—Laser etching
- B23K26/364—Laser etching for making a groove or trench, e.g. for scribing a break initiation groove
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K26/00—Working by laser beam, e.g. welding, cutting or boring
- B23K26/36—Removing material
- B23K26/40—Removing material taking account of the properties of the material involved
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D8/00—Modifying the physical properties by deformation combined with, or followed by, heat treatment
- C21D8/12—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties
- C21D8/1294—Modifying the physical properties by deformation combined with, or followed by, heat treatment during manufacturing of articles with special electromagnetic properties involving a localized treatment
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21D—MODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE, e.g. BY DECARBURISATION OR TEMPERING
- C21D9/00—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor
- C21D9/46—Heat treatment, e.g. annealing, hardening, quenching or tempering, adapted for particular articles; Furnaces therefor for sheet metals
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0004—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed
- G02B19/0019—Condensers, e.g. light collectors or similar non-imaging optics characterised by the optical means employed having reflective surfaces only (e.g. louvre systems, systems with multiple planar reflectors)
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B19/00—Condensers, e.g. light collectors or similar non-imaging optics
- G02B19/0033—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use
- G02B19/0047—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source
- G02B19/0052—Condensers, e.g. light collectors or similar non-imaging optics characterised by the use for use with a light source the light source comprising a laser diode
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/101—Scanning systems with both horizontal and vertical deflecting means, e.g. raster or XY scanners
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B26/00—Optical devices or arrangements for the control of light using movable or deformable optical elements
- G02B26/08—Optical devices or arrangements for the control of light using movable or deformable optical elements for controlling the direction of light
- G02B26/10—Scanning systems
- G02B26/12—Scanning systems using multifaceted mirrors
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2101/00—Articles made by soldering, welding or cutting
- B23K2101/18—Sheet panels
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K2103/00—Materials to be soldered, welded or cut
- B23K2103/02—Iron or ferrous alloys
- B23K2103/04—Steel or steel alloys
Definitions
- the present disclosure relates to a laser scanning device, a laser scanning method, a laser processing device, and a method for manufacturing an electromagnetic steel sheet.
- a laser scanning device that irradiates a laser beam onto the surface of an object and scans the surface of the object with the laser beam to process or modify the surface of the object.
- a laser scanning device includes, for example, a laser beam output unit that outputs a laser beam, and a laser beam output unit fixed to a rotating shaft, such as that described in FIG.
- Some have a polygon mirror that reflects an output laser beam, and an optical system that guides the laser beam reflected by the polygon mirror to the surface of an object.
- Patent Document 1 Japanese Patent Publication No. 2018-507111
- a strip-shaped steel sheet is continuously passed, and a laser beam is scanned and irradiated on the surface thereof in a direction substantially parallel to the width of the sheet to form thermal strain and grooves, thereby improving iron loss. Domain control is known.
- the scanning direction of the laser beam is one direction in the plate width direction, and a rotary polygon mirror is most suitable as a scanning device for the laser beam in one direction.
- the width of the electromagnetic steel sheet is usually 1000 mm or more, while the scanning width of the laser irradiation device is about 150 to 200 mm. Therefore, a plurality of 5 to 7 laser irradiation devices are required.
- the adjacent scanning lines are separated from each other and a laser non-irradiated portion is generated in the plate width direction, the iron loss reduction effect is greatly reduced. need to be placed.
- the width of the entire laser irradiation device is wide with respect to the scanning width of the laser, it is necessary to extend the laser irradiation device in the direction in which the plate passes in order to overlap adjacent scanning lines. Therefore, there was a problem that the equipment became large.
- the width of the laser scanning line per unit is as wide as possible.
- Part) has a problem of power reflection loss of a laser beam with a finite diameter. In order to reduce this loss, it is necessary to increase the length of the reflecting surface of the polygon mirror in the circumferential direction relative to the diameter of the beam incident on the polygon mirror. That is, it is necessary to increase the diameter of the polygon mirror.
- the laser irradiation device when the rotation axis of the polygon mirror is orthogonal to the laser scanning direction, that is, when the rotation surface of the polygon mirror is parallel to the scanning surface, and when the diameter of the polygon mirror is large, the laser irradiation device The width in the scanning direction becomes larger than the diameter of the polygon mirror, resulting in an increase in the width occupied by the laser scanning device. Therefore, in order to arrange the laser scanning lines on the surface of the electromagnetic steel sheet without gaps in the sheet width direction, it is necessary to arrange the laser irradiation device so as to extend in the sheet passing direction, which causes the problem of increasing the size of the equipment.
- the present disclosure reduces the width occupied by a laser scanning device and reduces the width occupied by a laser scanning device compared to conventional laser scanning devices, such as a laser scanning device in which the plane of rotation of the polygon mirror is parallel to the surface of the object.
- An object of the present invention is to allow scanning lines to be compactly arranged in the plate width direction.
- a laser scanning device that scans the surface of an object with a laser beam, comprising: a laser beam output unit that irradiates the laser beam; , a prism having a polygonal top surface and a bottom surface, at least one surface other than the top surface and the bottom surface being formed of a mirror, and an axis penetrating the top surface and the bottom surface being a rotation axis a polygon mirror that rotates and reflects the laser beam emitted from the laser beam output unit by the mirror; and an optical system that guides the laser beam reflected by the polygon mirror to the surface of the object.
- the rotation axis of the polygon mirror is parallel to the surface of the object and substantially parallel to the scanning direction of the laser beam.
- a laser scanning method for scanning a surface of an object with a laser beam, wherein the laser beam is and a prism shape having a polygonal top surface and a bottom surface, at least one surface other than the top surface and the bottom surface being formed of a mirror, and the top surface and the a reflection step of reflecting the laser beam emitted from the laser beam output unit by the polygon mirror rotating about an axis penetrating the bottom surface, and reflecting the laser beam by the polygon mirror using an optical system; and a light guiding step for guiding the laser beam to the surface of the object, wherein the rotation axis of the polygon mirror is parallel to the surface of the object and substantially parallel to the direction in which the laser beam is scanned.
- the width occupied by the laser scanning device is reduced compared to a conventional laser scanning device such as a laser scanning device in which the plane of rotation of the polygon mirror is substantially parallel to the surface of the object, A plurality of laser scanning lines can be compactly arranged in the plate width direction.
- FIG. 1 is a perspective view of a laser scanning device according to the first embodiment.
- FIG. 2 is a plan view of the laser scanning device according to the first embodiment.
- FIG. 3 is a diagram for explaining the effective scanning length of the laser beam according to the first embodiment.
- FIG. 4 is a plan view of the laser processing apparatus according to the first embodiment.
- FIG. 5 is a perspective view of a laser scanning device according to the second embodiment.
- FIG. 6 is a plan view of a laser scanning device according to the second embodiment.
- FIG. 7 is a plan view of a laser processing apparatus according to the second embodiment.
- FIG. 8 is a perspective view of a first rotating member applied to a first modification of the laser scanning device according to the second embodiment;
- FIG. 8 is a perspective view of a first rotating member applied to a first modification of the laser scanning device according to the second embodiment;
- FIG. 9 is a plan view of a first rotating member applied to a first modification of the laser scanning device according to the second embodiment
- FIG. 10 is a perspective view of a second rotating member applied to a second modification of the laser scanning device according to the second embodiment
- FIG. 11 is a front view of a second rotating member applied to a second modification of the laser scanning device according to the second embodiment
- FIG. 12 is a front view of a second rotating member applied to a second modification of the laser scanning device according to the second embodiment
- FIG. 13 is a plan view of a second rotating member applied to a second modification of the laser scanning device according to the second embodiment
- FIG. 14 is a side view of a second rotating member applied to a second modification of the laser scanning device according to the second embodiment
- FIG. 15 is a perspective view of a laser scanning device according to the third embodiment.
- FIG. 16 is a plan view of a laser scanning device according to the third embodiment.
- FIG. 17 is a plan view of a laser processing apparatus according to the third embodiment.
- FIG. 18 is a plan view of a laser scanning device according to the fourth embodiment.
- FIG. 19 is a plan view of a laser processing apparatus according to the fourth embodiment.
- FIG. 20 is a perspective view of a laser scanning device according to a comparative example.
- FIG. 21 is a plan view of a laser scanning device according to a comparative example.
- FIG. 22 is a diagram illustrating an effective scanning length of a laser beam according to a comparative example;
- FIG. 23 is a diagram illustrating an ideal scanning length of a laser beam according to a comparative example; It is a top view of the laser processing apparatus which concerns on a comparative example.
- an electrical steel sheet In recent years, while a grain-oriented electrical steel sheet (hereinafter referred to as an electrical steel sheet) is passed at high speed in the rolling direction, the surface of the electrical steel sheet is irradiated with a minute laser beam focused to a diameter of 1 mm or less, and scanned in the sheet width direction.
- Various studies have been conducted on a so-called magnetic domain control process, in which the core loss of an electromagnetic steel sheet is reduced by forming linear distortions or grooves on the surface of the electromagnetic steel sheet at regular intervals.
- a polygon mirror type laser scanning device using a polygon mirror is used to scan the laser beam.
- a steel plate is passed at a speed of about 100 m/min, scanning with only one laser scanning device to form a processed portion on the surface of an electromagnetic steel plate enables the laser beam to scan at an ultra-high speed.
- a polygon mirror is required, and a laser beam output section with a large output is required.
- a laser scanner having such a polygon mirror and a laser beam output section is very expensive.
- the scanning width of each laser scanning device is shortened, and by arranging a plurality of laser scanning devices in the width direction of the electromagnetic steel sheet, the electromagnetic steel sheet can be scanned using a plurality of laser beams.
- a method is adopted in which scanning can be performed over substantially the entire area in the width direction of the plate.
- FIG. 20 and 21 show a laser scanning device 150 according to a comparative example as an example of a polygon mirror type laser scanning device.
- a laser scanning device 150 according to the comparative example includes a laser beam output section 152 , a plane mirror 154 , a polygon mirror 156 , a motor 160 and a condenser mirror 170 .
- the X-axis direction corresponds to the width direction of the electromagnetic steel sheet 40
- the Y-axis direction corresponds to the length direction of the electromagnetic steel sheet 40
- the Z-axis direction corresponds to the thickness direction of the electromagnetic steel sheet 40 .
- the electromagnetic steel sheet 40 is passed from the - side to the + side in the Y-axis direction.
- the width direction of the electromagnetic steel sheet 40 may be referred to as the X-axis direction
- the length direction of the electromagnetic steel sheet 40 may be referred to as the Y-axis direction
- the thickness direction of the electromagnetic steel sheet 40 may be referred to as the Z-axis direction.
- the laser beam output unit 152 emits a laser beam B
- the plane mirror 154 reflects the laser beam B emitted from the laser beam output unit 152 to the polygon mirror 156 side.
- the polygon mirror 156 is formed in the shape of a disc by a low polygonal prism, and a plurality of mirror surfaces 162 are formed by mirrors on each surface corresponding to the outer peripheral surface.
- the polygon mirror 156 is fixed to the rotating shaft 164 of the motor 160 and rotates together with the rotating shaft 164 .
- Rotation shaft 164 extends in the normal direction of the surface of electromagnetic steel plate 40 (that is, the Z-axis direction), and the plane of rotation of polygon mirror 156 is substantially parallel to the surface of electromagnetic steel plate 40 (that is, substantially parallel to the XY plane). ).
- the polygon mirror 156 is reflected by the plane mirror 154 by the mirror of the mirror plane 162 that has moved to a position facing the plane mirror 154 in the X-axis direction and the focusing mirror 170 in the Y-axis direction.
- the reflected laser beam B is directed toward the collecting mirror 170 and reflected.
- the collecting mirror 170 reflects the laser beam B reflected by the mirror surface 162 toward the electromagnetic steel sheet 40 side and converges the laser beam B on the surface of the electromagnetic steel sheet 40 .
- the angle of reflection of the laser beam B when reflected by the mirror of the mirror surface 162 changes continuously, and the incident position of the laser beam B incident on the collecting mirror 170 changes.
- the position on the electromagnetic steel sheet 40 irradiated with the laser beam B changes, and the surface of the electromagnetic steel sheet 40 is continuously scanned with the laser beam B, thereby causing linear distortion or distortion on the surface of the electromagnetic steel sheet 40.
- a processed portion 42 which is a groove, is formed.
- the mirror surface 162 reflecting the laser beam B is switched to the next mirror surface 162, so that the position on the electromagnetic steel plate 40 irradiated with the laser beam B changes discontinuously.
- the electromagnetic steel sheet 40 moves in the Y direction at a constant speed, so that the next workpiece 42 is formed on the surface of the electromagnetic steel sheet 40 at a constant interval in the Y-axis direction from the current workpiece 42 .
- FIG. 20 only the current processed portion 42 is shown for convenience.
- a plurality of the laser scanning devices 150 as described above are arranged in the width direction of the electromagnetic steel sheet 40 to scan the plurality of laser beams B on the electromagnetic steel sheet 40 .
- the following problem arises when attempting to scan in the sheet width direction.
- FIG. 22 is a diagram for explaining the effective scanning length Ls' of the laser beam B.
- the effective scanning length Ls' is such that the laser beam B with a finite beam diameter di emitted from the laser beam output unit 152 is formed on the mirror surface 162 of the polygon mirror 156.
- the beam diameter when reaching the mirror is the beam when the laser beam reflected by the polygon mirror 156 reaches the electromagnetic steel plate 40 during the period from contacting one end of the mirror to contacting the other end of the mirror.
- the diameter corresponds to the length along the direction of the rotation axis 164 of the polygon mirror 156 moving on the surface of the electromagnetic steel plate.
- the beam diameter di of the laser beam B emitted from the laser beam output unit 152 is determined by assuming that the intensity distribution of the laser beam B in the direction parallel to the plane of rotation of the polygon mirror 156 is a Gaussian distribution. It is the diameter that becomes "1/e 2 " of the intensity at the center of the optical axis, and is generally defined as the diameter of the region containing about 86% of the total power of the laser beam B. It may be defined as appropriate, such as a region containing power or a region containing 95% of the total power.
- FIG. 23 is a diagram for explaining the ideal scanning length Ls′′ of the laser beam B.
- the ideal scanning length Ls′′ is the laser beam B emitted from the laser beam output unit 152 as the polygon mirror 156 rotates. (That is, the laser beam B whose beam diameter can be regarded as a point) reaches the mirror formed on the mirror surface 162 of the polygon mirror 156.
- the optical axis touches one end of the mirror and then reaches the other end of the mirror.
- the optical axis of the laser beam reflected by the polygon mirror 156 when it reaches the electromagnetic steel plate 40 has a length along the direction of the rotation axis 164 of the polygon mirror 156 moving on the surface of the electromagnetic steel plate. Equivalent to.
- irregular reflection and/or split reflection of the laser beam B occurs at the boundaries of the plurality of mirror surfaces 162 formed on the outer peripheral surface of the polygon mirror 156 . Therefore, at the timing when the outer shape of the laser beam B passes through the boundary and the boundary is located inside the outer shape of the laser beam B, the power of the laser beam B with which the surface of the electromagnetic steel sheet 40 is irradiated decreases.
- the effective scanning length Ls' considering the size of the beam diameter of the beam B is shorter than the ideal scanning length Ls'' not considering the size of the beam diameter of the laser beam B.
- the plurality of laser beams B are scanned in the width direction of the electromagnetic steel sheet 40.
- the number of laser scanning devices 150 required for scanning in the plate width direction increases.
- the reflection loss of the laser beam B at the boundary portion of the plurality of mirror surfaces 162 is the tangential direction length Lm of the mirror surface 162 along the tangential direction of the polygon mirror 156 .
- the beam diameter di of the laser beam B incident on the mirror surface 162 For example, if the tangential length Lm is sufficiently large compared to the beam diameter di, the reflection loss will decrease and the effective scanning length Ls' will increase.
- the beam diameter di becomes small, the focusing performance of the laser beam B may deteriorate, and the surface of the electromagnetic steel sheet 40 may not be distorted or grooved. Also, when using a high-power laser beam B, such as in the case of processing grooves on the surface of the electromagnetic steel sheet 40, if the beam diameter di is reduced, the power density on the mirror surface increases, causing the problem of damage to the mirror. also occurs. Therefore, there is a limit to reducing the beam diameter di.
- the diameter of the polygon mirror 156 should be increased.
- the plane of rotation of polygon mirror 156 is parallel to the surface of electromagnetic steel plate 40 . Therefore, increasing the diameter of the polygon mirror 156 increases the width w of the laser scanning device 150 (that is, the width occupied by the laser scanning device 150), as shown in FIG. Therefore, there is a problem that it is difficult to arrange all the laser scanning devices 150 side by side in the width direction of the electromagnetic steel sheet 40 due to restrictions on installation locations.
- the light in the XY plane direction of the beam is condensed by one condensing mirror 170 as the condensing element.
- an f ⁇ lens may be used.
- the laser beam B may be condensed on an ellipse in combination with a condensing mirror that condenses only the light of . In either configuration, there is a limit to how much the beam diameter di on the mirror surface 22 of the polygon mirror 156 can be reduced for the reasons described above. need to be bigger.
- the first embodiment of the present disclosure has been made in view of the above problems, and is different from the configuration in which the plane of rotation of the polygon mirror is parallel to the surface of the electromagnetic steel sheet as in the laser scanning device according to the comparative example.
- the surface of a predetermined object is irradiated with the laser beam B to process the surface of the object or to modify the surface of the object.
- Various metal materials can be used as the object, but an electromagnetic steel sheet 40 can be used as an example, and it is particularly preferable to use a grain-oriented electromagnetic steel sheet. The description shall be given as an example.
- the laser scanner 10 As shown in FIG. 1, the laser scanner 10 according to the first embodiment includes a laser beam output section 12, a plane mirror 14, a polygon mirror 16, an optical system 18, and a motor 20. As shown in FIG.
- the laser beam output unit 12 irradiates a laser beam B, which is oscillated by a laser light source (not shown) and transmitted using an optical fiber or the like, toward a plane mirror 14 to be described later.
- the laser beam output unit 12 is located, for example, on the Y-axis direction + side (in other words, the positive direction side of the Y-axis) of the polygon mirror 16 and on the Z-axis direction + side (in other words, the positive direction side of the Z-axis) of the electromagnetic steel plate 40 . ).
- the laser beam output unit 12 is arranged so as to irradiate the laser beam B toward the Z-axis direction - side (in other words, the Z-axis negative direction side, ie, the electromagnetic steel sheet 40 side).
- the plane mirror 14 reflects the laser beam B output from the laser beam output unit 12, and changes the traveling direction of the laser beam B to the direction of the mirror surface 22 of the polygon mirror 16, which will be described later.
- the plane mirror 14 is arranged, for example, in a space below the laser beam output section 12 (that is, the negative side in the Z-axis direction) and above the electromagnetic steel plate 40 (that is, the positive side in the Z-axis direction). 12 and a polygon mirror 16, which will be described later, on the optical path of the laser beam B.
- the plane mirror 14 is arranged in such a direction as to reflect the laser beam B output from the laser beam output unit 12 toward the Y-axis direction - side (that is, the polygon mirror 16 side).
- the polygon mirror 16 has a prismatic shape with a polygonal top surface (that is, upper surface) and bottom surface (that is, lower surface).
- the polygon mirror 16 has a mirror surface 22 formed by mirroring at least one surface other than the top surface and the bottom surface.
- the polygon mirror 16 rotates around an axis passing through the top and bottom surfaces of the polygon mirror 16 as a rotation axis 24 .
- the polygon mirror 16 reflects the laser beam B emitted from the laser beam output unit 12 and reflected by the plane mirror 14 by the mirror of the mirror surface 22 .
- the direction of the laser beam B reflected by the mirror surface 22 changes according to the rotation of the polygon mirror 16, and the position where the laser beam B reaches the surface of the electromagnetic steel plate 40 through the optical system 18, which will be described later. will change. Therefore, the surface of the electromagnetic steel plate 40 can be scanned with the laser beam B as the polygon mirror 16 rotates.
- the top surface and bottom surface of the polygon mirror 16 are polygonal, the polygon may be regarded as a circle, and the diagonal line thereof may be referred to as the "outer diameter" in the following description.
- the rotating shaft 24 of the polygon mirror 16 is fixed to the rotating shaft of the motor 20 and rotates together.
- the motor 20 may have a reduction mechanism connected to the rotating shaft 24 .
- the rotating shaft 24 of the polygon mirror 16 extends parallel to the surface of the electromagnetic steel plate 40, for example, in the X-axis direction.
- the rotation plane of the polygon mirror 16 is a YZ plane perpendicular to the X-axis direction when viewed from the Z-axis direction.
- the laser beam B is substantially It is arranged at a position where it is reflected by the first mirror 26 located on the Z-axis direction - side.
- the optical system 18 is a group of optical elements that guide the laser beam B reflected by the polygon mirror 16 to the surface of the electromagnetic steel plate 40 that is the object.
- the optical system 18 can be realized by appropriately combining known optical elements, and includes, for example, a first mirror 26 , a second mirror 28 and a condenser mirror 30 .
- the first mirror 26 is arranged on the Z-axis direction - side facing the mirror surface 22 reflecting the laser beam B among the plurality of mirror surfaces 22 .
- the first mirror 26 is arranged so as to reflect the laser beam B reflected by the mirror surface 22 toward the + side in the X-axis direction. Also, the first mirror 26 is arranged such that the optical axis of the first mirror 26 is parallel to the X-axis direction.
- the second mirror 28 is arranged on the + side in the X-axis direction with respect to the first mirror 26, and is arranged in such a direction as to reflect the laser beam B reflected by the first mirror 26 to the + side in the Y-axis direction.
- the second mirror 28 is arranged such that the optical axis of the second mirror 28 is parallel to the Y-axis direction.
- the collecting mirror 30 is, for example, a collecting parabolic mirror.
- the condenser mirror 30 is arranged on the positive side in the Y-axis direction with respect to the second mirror 28 and on the positive side in the Z-axis direction with respect to the electromagnetic steel plate 40 .
- the condensing mirror 30 is arranged in such a direction as to reflect the laser beam B reflected by the second mirror 28 to the Z-axis direction - side (that is, the electromagnetic steel plate 40 side).
- the collecting mirror 30 is arranged so that the optical axis of the collecting mirror 30 is parallel to the Z-axis direction.
- the position of the condensing mirror 30 is set at a position where the incident laser beam B is condensed on the surface of the electromagnetic steel plate 40 .
- This condenser mirror 30 is formed in an elongated shape.
- the direction of the condenser mirror 30 is set such that the longitudinal direction of the condenser mirror 30 is parallel to the X-axis direction when viewed from the Z-axis direction, so that the scanning direction of the laser beam B is aligned with the X-axis direction. They are set substantially parallel.
- the optical system 18 can guide the laser beam B reflected by the polygon mirror 16 to the surface of the electromagnetic steel plate 40, and the laser beam B on the surface of the electromagnetic steel plate 40 according to the rotation of the polygon mirror 16. can be changed, for example, parallel to the X-axis direction. That is, the laser beam B can be used to scan the surface of the electromagnetic steel sheet 40 , which is an object, to process the surface of the electromagnetic steel sheet 40 or to modify the surface of the electromagnetic steel sheet 40 .
- the laser beam B emitted from the optical system 18, particularly the collector mirror 30, is The direction of scanning the surface of the electromagnetic steel sheet 40 is along the X-axis direction. That is, the direction of the rotating shaft 24 of the polygon mirror 16 and the scanning direction are parallel. In other words, the rotation axis 24 extends along the direction in which the laser beam B is scanned. Therefore, by using the laser scanning device 10 of the present disclosure, the width occupied by the polygon mirror 16 in the width direction of the electromagnetic steel sheet 40, which tends to increase in the radial direction perpendicular to the rotation axis 24, can be reduced relative to the scannable width. can be relatively small. That is, the width occupied by each laser scanning device 10 can be reduced.
- the laser scanning device 10 performs processing for scanning the surface of the electromagnetic steel plate 40 with the laser beam B, which is performed by the laser scanning device 10 .
- the laser beam B when the laser beam B is irradiated from the laser beam output unit 12 toward the plane mirror 14, the laser beam B is directed by the plane mirror 14 to the Y-axis direction - side (that is, the polygon mirror 16 side). reflected to
- the polygon mirror 16 is rotated integrally with the rotating shaft 24 of the motor 20, and the laser beam B emitted from the laser beam output unit 12 is directed to the mirror surface 22 of the polygon mirror 16. to reflect.
- the laser beam B reflected by the mirror of the mirror surface 22 is reflected by the first mirror 26 to the + side in the X-axis direction, and the laser beam B reflected by the first mirror 26 is reflected by the second mirror 28 to the + side in the Y-axis direction. reflected. Also, the laser beam B reflected by the second mirror 28 is reflected by the condensing mirror 30 and condensed on the surface of the electromagnetic steel plate 40 . That is, the laser beam B reflected by the polygon mirror 16 is guided to the surface of the electromagnetic steel plate 40 .
- the angle of reflection of the laser beam B reflected by the mirror surface 22 continuously changes. and the incident position of the laser beam B incident on the condenser mirror 30 change. Then, the laser beam B is irradiated in the X-axis direction, and by scanning the surface of the electromagnetic steel sheet 40 with the laser beam B, the processed portion 42 that is a linear distortion or groove is formed on the surface of the electromagnetic steel sheet 40 .
- the mirror surface 22 reflecting the laser beam B is switched to the next mirror surface 22, so that the electromagnetic steel plate 40 is spaced apart from the currently processed portion 42 in the Y-axis direction.
- the next processed portion 42 is formed on the surface of . In FIG. 1, for convenience, only the current processed portion 42 is shown.
- the plane of rotation of the polygon mirror 16 (that is, the YZ plane) is orthogonal to the X-axis direction.
- the width W of the laser scanning device 10 according to the first embodiment is the width of the laser scanning device 150 according to the comparative example illustrated in FIG. narrower than Further, the laser scanning device 10 according to the first embodiment satisfies W ⁇ Ls in the relationship between the width W and the effective scanning length Ls.
- the diameter of the polygon mirror 16 is preferably 400 mm or more. is.
- the width W is the width of the laser scanning device 10 along the X-axis direction (that is, the width occupied in the width direction of the electromagnetic steel sheet 40).
- the width W corresponds to the maximum width between the + side end and the - side end of the laser scanning device 10 in the X-axis direction.
- the effective scanning length Ls is the beam length when the laser beam B emitted from the laser beam output unit 12 reaches the mirror formed on the polygon mirror 16 as the polygon mirror 16 rotates.
- the effective scanning length Ls is defined by the length along the rotation axis 24 of the polygon mirror 16 .
- the effective scanning length Ls corresponds to the length of the processed portion 42 in the X-axis direction.
- part of the range of the width W of the laser scanning device 10 protrudes from the range of the effective scanning length Ls. is satisfied, the range of the width W of the laser scanning device 10 may protrude from the range of the effective scanning length Ls.
- laser processing equipment Next, a laser processing device 50 using the laser scanning device 10 according to the first embodiment will be described.
- the laser processing device 50 includes a plurality of laser scanning devices 10. As shown in FIG. A plurality of laser scanning devices 10 are arranged side by side in the X-axis direction. The positions of the plurality of laser scanning devices 10 are set such that adjacent laser scanning devices 10 form the processed portions 42 continuously in the X-axis direction or partially overlap the processed portions 42 in the X-axis direction. ing.
- the adjacent laser scanning apparatuses 10 are controlled to scan the laser beam B in the same direction and/or control to shift the timing of scanning the laser beam B is performed.
- the number of laser scanning devices 10 provided in the laser processing device 50 can be any number as long as it is two or more. good.
- the laser processing device 50 can make the width occupied by each laser scanning device 10 smaller than the scanning width in the width direction of the electromagnetic steel sheet 40. It becomes possible to configure the entire processing apparatus 50 compactly.
- a method for manufacturing an electromagnetic steel sheet according to the first embodiment is a method for manufacturing an electromagnetic steel sheet using the laser scanning device 10 according to the first embodiment.
- a subsequent recrystallization annealing process, a coating process, and a laser processing process are provided.
- the slab is hot rolled to produce a hot rolled steel sheet.
- the hot-rolled steel sheet is cold-rolled to produce a cold-rolled steel sheet.
- the primary recrystallization annealing step the cold-rolled steel sheet is subjected to decarburization annealing to develop primary recrystallization in the cold-rolled steel sheet.
- the secondary recrystallization annealing step the cold-rolled steel sheet after the decarburization annealing is subjected to finish annealing to develop secondary recrystallization in the cold-rolled steel sheet, thereby forming the cold-rolled steel sheet into the electrical steel sheet 40 .
- the coating step the electromagnetic steel sheet 40 after finish annealing is coated.
- the laser processing process is performed, for example, after the secondary recrystallization process.
- the surface of the electromagnetic steel sheet 40 is scanned and irradiated with the laser beam B to form the processed portion 42 on the surface of the electromagnetic steel sheet 40 .
- a laser processing method using the laser processing apparatus 50 illustrated in FIG. 4 described above is performed.
- a laser beam B is output from the laser beam output unit 12
- the laser beam B output from the laser beam output unit 12 is The laser beam B reflected by the plane mirror 14 is reflected by the polygon mirror 16 while the polygon mirror 16 is being rotated. lead to the surface.
- a processed portion 42 which is a distortion or a groove, is formed on the surface of the electromagnetic steel sheet 40 over the sheet width direction.
- the above-described laser processing method is repeatedly performed while the electromagnetic steel sheet 40 is passed, so that a plurality of processed portions 42 that are continuous in the X-axis direction or partially overlap in the X-axis direction are formed. They are formed at regular intervals in the length direction of the electromagnetic steel sheet 40 .
- the rotation shaft 24 extends in the X-axis direction, and the rotation plane of the polygon mirror 16 is perpendicular to the X-axis direction when viewed from the Z-axis direction. . Therefore, compared to the case where the plane of rotation of the polygon mirror 156 is parallel to the surface of the electromagnetic steel plate 40 as in the laser scanning device 150 according to the comparative example illustrated in FIG. In the laser scanning device 10 according to the first embodiment, the width W occupied by the laser scanning device 10 along the X-axis direction can be reduced.
- the rotation plane of the polygon mirror 16 is orthogonal to the X-axis direction when viewed from the Z-axis direction, so that the width W of the laser scanning device 10 is larger than the effective scanning length Ls. can also be narrowed. Therefore, in the laser processing device 50 including a plurality of laser scanning devices 10, the plurality of laser scanning devices 10 can be arranged side by side in the X-axis direction while avoiding interference between adjacent laser scanning devices 10. As a result, compared to the case where a plurality of laser scanning devices 150 are arranged side by side in the X-axis direction and the Y-axis direction, for example, like the laser processing device 180 according to the comparative example illustrated in FIG. In the laser processing device 50 according to the first embodiment illustrated in 1, it is possible to reduce the size and cost of the laser processing device 50 including the plurality of laser scanning devices 10 .
- the laser processing step is performed after the secondary recrystallization step as an example, but is performed after any one of the cold rolling step, the primary recrystallization annealing step, and the coating step. good too.
- the laser processing process may be performed after the coating process.
- a re-coating process may be performed after the laser processing process as needed.
- the cold-rolled steel sheet corresponds to an example of the "target object” and the "steel sheet formed into an electromagnetic steel sheet” in the present disclosure.
- the laser scanning device 10 the laser scanning method, the laser processing device 50, and the laser processing method are applied to laser processing of an electromagnetic steel sheet. may be applied.
- the laser scanning device 10 and the laser scanning method may be applied to uses other than laser processing.
- the laser scanning device 10 includes the plane mirror 14 that reflects the laser beam B output from the laser beam output unit 12 toward the polygon mirror 16, but the plane mirror 14 is omitted. may Then, the position of the laser beam output unit 12 may be set to a position where the laser beam B is output toward the polygon mirror 16 .
- the arrangement of the laser beam output unit 12, the plane mirror 14, the first mirror 26, the second mirror 28, and the collecting mirror 30 may be other than the above.
- the optical system 18 includes the first mirror 26, the second mirror 28, and the condenser mirror 30, but the optical system other than the first mirror 26, the second mirror 28, and the condenser mirror 30 It may have parts.
- the optical system 18 includes the condensing mirror 30, but instead of the condensing mirror 30, it may include an f ⁇ lens.
- the surface of the electromagnetic steel sheet 40 passed in the horizontal direction is irradiated with the laser beam B by the laser scanning device 10.
- the surface of 40 may be irradiated with laser beam B by laser scanning device 10 .
- the plurality of laser scanning devices 10 arranged in the X-axis direction are arranged at the same position in the Y-axis direction, but the plurality of laser scanning devices 10 arranged in the X-axis direction Some of the laser scanning devices 10 may be displaced from other laser scanning devices 10 in the Y-axis direction.
- a laser scanning device 60 according to the second embodiment shown in FIGS. 5 and 6 has the following configuration compared to the laser scanning device 10 according to the first embodiment illustrated in FIGS. 1 and 2 described above. has been edited.
- the longitudinal direction of the condenser mirror 30 is inclined with respect to the X-axis direction when viewed from the Z-axis direction.
- the scanning direction of B is inclined with respect to the X-axis direction. Note that even if the longitudinal direction of the condenser mirror 30 is parallel to the X-axis direction without being tilted with respect to the X-axis direction, the electromagnetic steel plate 40 is also conveyed during the scanning period. Therefore, in most cases, the scanning direction is not parallel to the X-axis, but is slightly inclined from the X-axis toward the Y-axis.
- the rotating shaft 24 of the polygon mirror 16 is oriented in a direction that intersects the scanning direction of the laser beam B when viewed from the normal direction of the surface of the electromagnetic steel plate 40 as the object. That is, in the present disclosure, even if the rotation axis 24 of the polygon mirror 16 faces a direction that intersects the scanning direction of the laser beam B when viewed from the normal direction of the surface of the electromagnetic steel sheet 40, the rotation axis 24 are assumed to be substantially parallel to the scanning direction. In other words, the rotation axis 24 extends along the direction in which the laser beam B is scanned.
- a first tilt angle ⁇ 1 between the scanning direction of the laser beam B and the X-axis direction is set to 0° ⁇ 45°, for example.
- the processed portion 42 formed on the surface of the electromagnetic steel sheet 40 can be inclined with respect to the X-axis direction. Therefore, when the electromagnetic steel sheet 40 is bent, it is possible to suppress breakage of the electromagnetic steel sheet 40 starting from the processed portion 42 . Further, when the first inclination angle ⁇ 1 is smaller than 45°, the effect of reducing iron loss by forming the processed portion 42 on the surface of the electromagnetic steel sheet 40 can be ensured. It should be noted that the first inclination angle ⁇ 1 is more preferably 5° or more and 10° or less.
- the laser beam B is scanned in an oblique direction with respect to the X-axis direction. specified by The effective scanning length Ls is calculated by L ⁇ cos ⁇ , where L is the scanning length of the laser beam B.
- the plane of rotation of the polygon mirror 16 (that is, the YZ plane) intersects the X-axis direction when viewed from the Z-axis direction. Accordingly, the width W of the laser scanning device 60 according to the second embodiment is narrower than the width w of the laser scanning device 150 according to the comparative example illustrated in FIG. Further, the laser scanning device 60 according to the second embodiment satisfies W ⁇ Ls in relation to the width W and the effective scanning length Ls.
- the width W is the width of the laser scanning device 60 along the X-axis direction.
- the width W corresponds to the width from the + side end to the - side end of the laser scanning device 60 in the X-axis direction.
- the + side end and the - side end of the laser scanning device 60 in the X-axis direction may be any part of the laser scanning device 60 .
- a laser processing device 70 includes a plurality of laser scanning devices 60.
- a plurality of laser scanning devices 60 are arranged side by side in the X-axis direction.
- the positions of the plurality of laser scanning devices 60 are set so that adjacent laser scanning devices 60 partially overlap the processed portion 42 in the X-axis direction.
- the overlapping length Wo corresponds to the length by which parts of the processed portions 42 formed adjacent to each other in the X-axis direction overlap in the X-axis direction. Parts of the workpieces 42 adjacent in the X-axis direction are formed apart in the Y-axis direction.
- the number of multiple laser scanning devices 60 provided in the laser processing device 70 can be any number as long as it is two or more. good.
- the laser scanning method and laser processing method according to the second embodiment are the same as the laser scanning method and laser processing method according to the above-described first embodiment, except that the laser beam B is scanned in a direction oblique to the X-axis direction. There is, and the explanation is omitted.
- the processed portion 42 which is a linear distortion or groove formed on the surface of the electromagnetic steel sheet 40, is scanned. It can be tilted with respect to the X-axis direction. Therefore, even when the electromagnetic steel sheet 40 is bent, it is possible to suppress breakage of the electromagnetic steel sheet 40 starting from the processed portion 42 .
- the optical system 18 may include a first rotating member 62.
- the first rotating member 62 is plate-shaped and has an isosceles trapezoidal shape in plan view. Note that, in the present disclosure, the shape of the first rotating member 62 can be changed as appropriate.
- the first rotating member 62 is rotatably supported along the XY plane about a rotation center 62A by a rotation support mechanism (not shown).
- the first rotation center 62A is located on the optical axis of the first mirror 26 and on the reflecting surface of the second mirror 28 when viewed from the Z-axis direction.
- the first rotating member 62 rotates, the distance on the optical axis center between the first mirror 26 and the second mirror 28 remains the same. Also, the first rotating member 62 rotates along a plane including the optical path of the laser beam B between the second mirror 28 and the condenser mirror 30 .
- the second mirror 28 and the condenser mirror 30 are fixed on the upper surface of the first rotating member 62 .
- the first rotary member 62 is formed with a hole 64 through which the laser beam B reflected by the condenser mirror 30 passes.
- the hole 64 has an isosceles trapezoidal shape in plan view.
- the second mirror 28 corresponds to the reflecting mirror of the present disclosure. Note that in the present disclosure, the shape of the hole 64 can be changed as appropriate.
- the optical system 18 according to the second embodiment includes the first rotating member 62, the first tilt angle ⁇ 1 between the scanning direction of the laser beam B and the X-axis direction can be adjusted.
- the first rotating member 62 supports the second mirror 28 and the collector mirror 30 so as to fix the relative positions of the second mirror 28 and the collector mirror 30 . Therefore, even when the position of the second mirror 28 changes so as to change the first tilt angle ⁇ 1 between the scanning direction and the X-axis direction, the rotation of the first rotary member 62 allows the second mirror 28 to rotate. Changes in the position of the mirror 28 and changes in the position of the collector mirror 30 can be interlocked.
- the predetermined first tilt angle ⁇ 1 may be formed by rotating the first rotating member 62 before the scanning of the laser beam B is started.
- the first inclination angle ⁇ 1 may be changed at any time by changing the sheet threading speed or by an angle rotating device (not shown) as necessary.
- the scanning direction when the scanning direction is changed as necessary, it is not necessary to adjust the second mirror 28 and the condenser mirror 30 individually, and the change can be easily made only by rotating the first rotating member 62.
- the relative positional relationship between the second mirror 28 and the condenser mirror 30 since the relative positional relationship between the second mirror 28 and the condenser mirror 30 is fixed, the position of the laser beam incident on the reflecting surface of the condenser mirror 30 is constant. Therefore, the light condensing property does not change before and after changing the scanning direction, and stable processing can be performed.
- the optical system 18 according to the second embodiment may include a second rotating member 63, as shown in FIGS.
- the second rotating member 63 is plate-shaped and rectangular in plan view. Note that, in the present disclosure, the shape of the second rotating member 63 can be changed as appropriate.
- a first mirror 26 is installed on the upper surface of the second rotating member 63 at one end (the left end in FIG. 10) corresponding to the lower side of the polygon mirror (not shown).
- the second rotating member 63 is rotatably supported along the ZX plane about a second rotation center 63A by a rotation support mechanism (not shown).
- the second center of rotation 63A is located on the optical axis of the second mirror 28 and on the planar reflecting surface of the first mirror 26 when viewed in the Y-axis direction.
- the second rotating member 63 has a function of rotating around the axis of the second rotation center 63A. Even if the second rotating member 63 rotates, the distance on the optical axis between the first mirror 26 and the second mirror 28 remains the same. Rotation of the second rotating member 63 causes the plane including the optical path of the laser beam B between the first mirror 26 and the second mirror 28 to move toward the XY plane in FIG. Rotate towards, towards or away from.
- the first rotating member 62 is rotatably supported along the XY plane about the first rotation center 62A.
- a first rotating member 62 according to the second modification shown in FIG. 10 has a rectangular shape in plan view and a hole 64 has a rectangular shape as compared with the first rotating member 62 described in the first modification. point is different. Also in the second rotating member 63 of the second modified example, the shape of the hole 64 can be changed as appropriate.
- Other configurations of the first rotating member 62 according to the second modified example are the same as those of the first rotating member 62 according to the first modified example.
- a first distance L1 between a scanning start position P1 on the surface of the electromagnetic steel plate 40 and the reflection point of the condenser mirror 30, and a scanning end position P2 on the surface of the electromagnetic steel plate 40 and the reflection point of the condenser mirror 30 are and a second distance L2 of .
- the first distance L1 and the second distance L2 match the focal length of the condenser mirror 30, no defocus occurs over the entire length of the scanning line between the scanning start position P1 and the scanning end position P2.
- a second inclination angle ⁇ 2 is formed between the surface of the electromagnetic steel sheet 40 and the X-axis direction as shown in FIG.
- the first distance L1 and the second distance L2 are different.
- the first distance L1 and the second distance L2 match the focal length of the collecting mirror 30 by rotating the second rotating member 63 by the second tilt angle ⁇ 2.
- the predetermined second tilt angle ⁇ 2 may be formed by rotating the second rotating member 63 in advance before the scanning of the laser beam B is started.
- a change in inclination may be detected by a steel plate inclination measuring device (not shown) and the second inclination angle ⁇ 2 may be changed as needed. Therefore, in the second modification, uniform laser processing can be performed over the entire width of the scanning direction of the laser beam B on the surface of the electromagnetic steel sheet 40 .
- the scanning direction forms a first inclination angle ⁇ 1 with the X-axis direction.
- the position of the second mirror 28 and the position of the collecting mirror 30 change integrally. Therefore, as shown in FIG. 14, the surface of the electromagnetic steel sheet 40 can be subjected to laser processing while suppressing the occurrence of out-of-focus blur, as in the first modification.
- the first mirror 26 , the second mirror 28 , and the collecting mirror 30 may be provided on the second rotating member 63 without providing the first rotating member 62 .
- a laser scanning device 80 according to the third embodiment shown in FIGS. 15 and 16 has the following configuration compared to the laser scanning device 60 according to the second embodiment illustrated in FIGS. has been edited.
- the laser scanning device 80 includes a first laser scanning section 82, a second laser scanning section 84, a polygon mirror 16, and a motor 20.
- the first laser scanning section 82 includes a laser beam output section 12 , a plane mirror 14 and an optical system 18 .
- the laser beam output unit 12, the plane mirror 14, and the optical system 18, which constitute the first laser scanning unit 82, are the same as those in the above-described second embodiment.
- the polygon mirror 16 and the motor 20 are the same as those in the above-described second embodiment.
- the laser beam output unit 12 outputs a first laser beam B1.
- the first laser beam B1 irradiates the surface of the electromagnetic steel plate 40 via the plane mirror 14, the polygon mirror 16, and the optical system 18. As shown in FIG.
- the second laser scanning unit 84 includes a laser beam output unit 92, a mirror 94, and an optical system 98.
- Optical system 98 includes first mirror 106 , second mirror 108 , and collector mirror 110 .
- Laser beam output section 92 , mirror 94 , first mirror 106 , second mirror 108 , and collecting mirror 110 are arranged with laser beam output section 12 , plane mirror 14 , first mirror 26 , second mirror 26 with respect to axis of rotation 24 . It is arranged at a position symmetrical to the mirror 28 and the condenser mirror 30 in the Y-axis direction.
- laser beam output section 92, mirror 94, first mirror 106, second mirror 108, and collection mirror 110 are integrated into laser beam output section 12, plane mirror 14, first mirror 26, second mirror 28, and They have the same configuration as the condensing mirror 30 .
- the laser beam output unit 92 outputs the second laser beam B2.
- the surface of the electromagnetic steel plate 40 is irradiated with the first laser beam B1 output from the laser beam output unit 12 via the plane mirror 14, the polygon mirror 16, and the optical system 18.
- the second laser beam B2 output from 92 irradiates the surface of the electromagnetic steel plate 40 via a mirror 94 , a polygon mirror 96 and an optical system 98 .
- the second laser beam B2 is scanned in the opposite direction to the first laser beam B1.
- the orientations of the second mirror 108 and the condenser mirror 110 are set so that the scanning direction of the second laser beam B2 is parallel to the scanning direction of the first laser beam B1.
- the positions of the second mirror 108 and the condenser mirror 110 correspond to the position and length in the X-axis direction of the processed portion 42 formed by the second laser beam B2 and the processed portion formed by the first laser beam B1. 42 in the X-axis direction and the same length.
- the effective scanning length Ls1 of the first laser beam B1 and the effective scanning length Ls2 of the second laser beam B2 are the same.
- the processed portion 42 formed by the second laser beam B2 is formed in the central portion between the plurality of processed portions 42 formed by the first laser beam B1.
- the outer diameter of the polygon mirror 16 and/or the arrangement position of the optical system 18 are set so that That is, in the laser scanning device 80 according to the third embodiment, the pitch of the plurality of processed portions 42 is PL, and the processed portions 42 formed by the first laser beam B1 and the processed portions formed by the second laser beam B2
- the distance from the processed portion 42 is G
- n is an integer of 0 or more
- the laser processing device 120 includes a plurality of laser scanning devices 80.
- a plurality of laser scanning devices 80 are arranged side by side in the X-axis direction.
- the positions of the plurality of laser scanning devices 80 are set such that adjacent laser scanning devices 80 partially overlap the processed portion 42 in the X-axis direction.
- the overlapping length Wo corresponds to the length by which parts of the processed portions 42 formed adjacent to each other in the X-axis direction overlap in the X-axis direction. Parts of the workpieces 42 adjacent in the X-axis direction are formed apart in the Y-axis direction.
- the number of laser scanning devices 80 provided in the laser processing device 120 can be any number as long as it is two or more. good.
- the surface of the electromagnetic steel sheet 40 is irradiated with the first laser beam B1 and the second laser beam B2 by a single laser scanning device 80. This is the same as the laser scanning method and the laser processing method according to the second embodiment, so description thereof will be omitted.
- the surface of the electromagnetic steel plate 40 is irradiated with the first laser beam B1 and the second laser beam B2 on both sides of the polygon mirror 16 in the Y-axis direction.
- the processed portions 42 can be formed on both sides in the axial direction. Therefore, it is possible to improve the processing efficiency when forming a plurality of processed portions 42 on the surface of the electromagnetic steel plate 40, as compared with, for example, the case where the processed portions 42 are formed on one side of the polygon mirror 16 in the Y-axis direction. can be done.
- the processed portions 42 can be formed on both sides of the polygon mirror 16 in the Y-axis direction.
- the pitch of the processed portions 42 formed by the first laser scanning section 82 and the pitch of the processed sections 42 formed by the second laser scanning section 84 The pitch of the processed portions 42 to be processed can be widened. Therefore, the time required to form one processed portion 42 can be increased, so that the effective scanning length Ls of the first laser beam B1 and the effective scanning length Ls of the second laser beam B2 can be increased. . Thereby, it is possible to improve the processing efficiency when forming the plurality of processed portions 42 on the surface of the electromagnetic steel sheet 40 .
- the first laser beam B1 and the second laser beam B2 are scanned in directions oblique to the X-axis direction.
- the first laser beam B1 and the second laser beam B2 may each be scanned in the X-axis direction.
- the laser scanning device 130 according to the fourth embodiment shown in FIGS. 18 and 19 has the following configuration compared to the laser scanning device 80 according to the third embodiment illustrated in FIGS. 15 and 16 described above. has been edited.
- the second laser scanning section 84 is arranged point-symmetrically with respect to the first laser scanning section 82 about the center point 16A of the polygon mirror 16 when viewed from the Z-axis direction. It is configured. Specifically, while the second mirror 28 and the condenser mirror 30 of the first laser scanning unit 82 are arranged on the + side in the X-axis direction and the + side in the Y-axis direction with respect to the polygon mirror 16, the second The second mirror 108 and the condenser mirror 110 of the laser scanning unit 84 are arranged on the - side in the X-axis direction and the - side in the Y-axis direction with respect to the polygon mirror 16 .
- the second laser beam B2 is scanned in the opposite direction to the first laser beam B1.
- the orientations of the second mirror 108 and the condenser mirror 110 are set so that the scanning direction of the second laser beam B2 is parallel to the scanning direction of the first laser beam B1. Furthermore, the positions of the second mirror 108 and the condenser mirror 110 are such that the length in the X-axis direction of the processed portion 42 formed by the second laser beam B2 is the length of the processed portion 42 formed by the first laser beam B1. It is set at a position that is the same as the length in the X-axis direction.
- the effective scanning length Ls1 of the first laser beam B1 and the effective scanning length Ls2 of the second laser beam B2 are the same.
- a laser processing device 140 includes a plurality of laser scanning devices 130.
- a plurality of laser scanning devices 130 are arranged side by side in the X-axis direction.
- the positions of the plurality of laser scanning devices 130 are set so that adjacent laser scanning devices 130 partially overlap the processed portion 42 in the X-axis direction.
- the overlapping length Wo corresponds to the length by which parts of the processed portions 42 formed adjacent to each other in the X-axis direction overlap in the X-axis direction. Parts of the workpieces 42 adjacent in the X-axis direction are formed apart in the Y-axis direction.
- the relationship between the width W, the effective scanning length Ls1 of the first laser beam B1, the effective scanning length Ls2 of the second laser beam B2, and the overlapping length Wo is such that W ⁇ It satisfies Ls1+Ls2-Wo.
- FIG. 19 shows two laser scanning devices 130 as an example, the number of laser scanning devices 130 included in the laser processing device 140 can be any number as long as it is two or more. good.
- the second laser scanning unit 84 is configured point-symmetrically with respect to the first laser scanning unit 82, so that the object formed by the second laser beam B2 is
- the laser scanning method and the laser processing method according to the third embodiment are the same except that the position of the processed portion 42 is symmetrical with respect to the position of the processed portion 42 formed by the first laser beam B1. , the description of which is omitted.
- the surface of the electromagnetic steel plate 40 is irradiated with the first laser beam B1 and the second laser beam B2 on both sides of the polygon mirror 16 in the X-axis direction.
- the processed portions 42 can be formed on both sides in the axial direction. Therefore, compared to the case where the processed portion 42 is formed on one side of the polygon mirror 16 in the X-axis direction, it is possible to form the processed portion 42 over a wider range in the X-axis direction with a single laser scanning device 10. can be done.
- the processed portions 42 can be formed on both sides of the polygon mirror 16 in the X-axis direction. 42 having the same length, the laser scanning device 130 is used as compared with the case where the processed portion 42 is formed on one side of the polygon mirror 16 in the X-axis direction by one laser scanning device 130, for example. It can be made smaller.
- the first laser beam B1 and the second laser beam B2 are scanned in directions inclined with respect to the X-axis direction.
- the first laser beam B1 and the second laser beam B2 may each be scanned in the X-axis direction.
- aspect 1 is A laser scanning device that scans the surface of an object with a laser beam, a laser beam output unit that irradiates the laser beam; It has a prism shape having a polygonal top surface and a bottom surface, at least one surface other than the top surface and the bottom surface is formed of a mirror, and it rotates about an axis penetrating the top surface and the bottom surface as a rotation axis.
- a polygon mirror for reflecting the laser beam emitted from the laser beam output unit by the mirror; an optical system for guiding the laser beam reflected by the polygon mirror to the surface of the object; the rotation axis of the polygon mirror is parallel to the surface of the object and substantially parallel to the direction in which the laser beam is scanned; Laser scanner.
- Aspect 2 is As the polygon mirror rotates, when the laser beam emitted from the laser beam output unit reaches the mirror formed on the polygon mirror, the beam diameter changes from one end of the mirror to the other.
- Aspect 3 is The optical system is a reflecting mirror that reflects the laser beam reflected by the polygon mirror and changes the scanning direction of the laser beam; a collecting mirror that reflects the laser beam reflected by the reflecting mirror toward the object; a rotating member that supports the reflecting mirror and the collecting mirror and rotates along a plane that includes the optical path of the laser beam between the reflecting mirror and the collecting mirror; comprising 3.
- the laser scanning device according to aspect 1 or 2.
- Aspect 5 is A plurality of the laser scanning devices according to aspect 1 are arranged side by side in the width direction of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet, and the surface of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet is scanned with the laser beam. to process, Laser processing equipment.
- Aspect 6 is A plurality of the laser scanning devices according to aspect 1 are arranged side by side in the plate width direction of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet, and the surface of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet is scanned with a laser beam. to process, A method for manufacturing an electromagnetic steel sheet.
- a laser scanning device that scans the surface of an object with a laser beam, a laser beam output unit that irradiates the laser beam; It has a prismatic shape with polygonal upper and lower surfaces, at least one surface other than the upper surface and the lower surface is formed of a mirror, and it rotates about an axis passing through the upper surface and the lower surface as a rotation axis, a polygon mirror that causes the mirror to reflect the laser beam emitted from the laser beam output unit; an optical system for guiding the laser beam reflected by the polygon mirror to the surface of the object; the rotation axis of the polygon mirror is parallel to the surface of the object and substantially parallel to the direction in which the laser beam is scanned; Laser scanner.
- Another aspect 2 is As the polygon mirror rotates, when the laser beam emitted from the laser beam output unit reaches the mirror formed on the polygon mirror, the beam diameter changes from one end of the mirror to the other.
- Another aspect 3 is A laser scanning method for scanning a surface of an object with a laser beam, a laser beam output step of irradiating the laser beam using a laser beam output unit;
- a polygon mirror having a prismatic shape with polygonal upper and lower surfaces, at least one surface other than the upper and lower surfaces being formed of a mirror, and rotating about an axis passing through the upper and lower surfaces.
- Laser scanning method for scanning a surface of an object with a laser beam, a laser beam output step of irradiating the laser beam using a laser beam output unit;
- a polygon mirror having a prismatic shape with polygonal upper and lower surfaces, at least one surface other
- Another aspect 4 is A plurality of the laser scanning devices according to another aspect 1 are arranged side by side in the width direction of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet, and the surface of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet is scanned with the laser beam. Scan and process with Laser processing equipment.
- Another aspect 5 is A plurality of the laser scanning devices according to another aspect 1 are arranged side by side in the plate width direction of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet, and the surface of the electromagnetic steel sheet or the steel sheet formed on the electromagnetic steel sheet is scanned with a laser beam. scan and process A method for manufacturing an electromagnetic steel sheet.
- the width occupied by the laser scanning device is reduced compared to conventional laser scanning devices such as those in which the plane of rotation of the polygon mirror is substantially parallel to the surface of the object. be able to.
- Laser scanning device 12
- Laser beam output unit 14
- Plane mirror 16
- Polygon mirror 18
- Optical system 20
- Motor 16
- Rotary shaft 26
- First mirror 28
- Second mirror 30
- Condensing mirror 40
- Electromagnetic steel plate 42
- Work piece 50
- Laser processing device 60
- Laser scanning device 62
- First rotating member 63
- Second rotating member 64
- Hole 70
- Laser processing device 80
- Laser scanning device 82
- First laser scanning unit 84
- Second laser scanning unit 92
- Laser beam output unit 94
- Polygon mirror 98
- laser scanning device 130
- laser scanning device 140
- laser processing device B B1 first laser beam B2 second laser beam
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Abstract
Description
図20及び図21には、ポリゴンミラー式のレーザ走査装置の一例として、比較例に係るレーザ走査装置150が示されている。比較例に係るレーザ走査装置150は、レーザビーム出力部152、平面ミラー154、ポリゴンミラー156、モータ160、及び集光ミラー170を備える。X軸方向は電磁鋼板40の板幅方向に相当し、Y軸方向は電磁鋼板40の長さ方向に相当し、Z軸方向は電磁鋼板40の板厚方向に相当する。電磁鋼板40は、Y軸方向-側から+側へ向けて通板される。以下、電磁鋼板40の板幅方向をX軸方向と称し、電磁鋼板40の長さ方向をY軸方向と称し、電磁鋼板40の板厚方向をZ軸方向と称する場合がある。
df=α×(f×λ)/di・・・(1)
ただし、αはレーザビームBに固有の定数であり、λはレーザビームBの波長であり、fは集光ミラー170の焦点距離である。
次に、本開示の第1実施形態について説明する。
図1に示すように、第1実施形態に係るレーザ走査装置10は、レーザビーム出力部12、平面ミラー14、ポリゴンミラー16、光学系18、及びモータ20を備える。
続いて、第1実施形態に係るレーザ走査装置10を用いた処理の流れについて説明する。
続いて、図2に示すレーザ走査装置10の幅W及び有効走査長さLsの関係について説明する。
続いて、第1実施形態に係るレーザ走査装置10を用いたレーザ加工装置50について説明する。
続いて、第1実施形態に係る電磁鋼板の製造方法について説明する。
続いて、第1実施形態の作用及び効果について説明する。
続いて、第1実施形態の変形例について説明する。
次に、本開示の第2実施形態について説明する。
続いて、第2実施形態の作用及び効果について第1実施形態と異なる点を説明する。
続いて、本開示の第2実施形態の第1変形例について説明する。
続いて、本開示の第2実施形態の第2変形例について説明する。
次に、本開示の第3実施形態について説明する。
G=(2n+1)×PL・・・(2)
続いて、第3実施形態の作用及び効果について第2実施形態と異なる点を説明する。
続いて、本開示の第3実施形態の変形例について説明する。
次に、本開示の第4実施形態について説明する。
続いて、第4実施形態の作用及び効果について第3実施形態と異なる点を説明する。
続いて、本開示の第4実施形態の変形例について説明する。
本明細書からは、以下の態様が概念化される。
対象物の表面をレーザビームで走査するレーザ走査装置であって、
前記レーザビームを照射するレーザビーム出力部と、
多角形の頂面及び底面を有する角柱状であり、前記頂面及び前記底面を除く少なくともいずれか一つの面がミラーで形成されており、前記頂面及び前記底面を貫く軸を回転軸として回転して、前記レーザビーム出力部から照射された前記レーザビームを前記ミラーで反射させるポリゴンミラーと、
前記ポリゴンミラーで反射した前記レーザビームを前記対象物の表面に導く光学系と、を有し、
前記ポリゴンミラーの前記回転軸は、前記対象物の表面と平行で、前記レーザビームが走査される方向と略平行である、
レーザ走査装置。
前記ポリゴンミラーの回転に伴って、前記レーザビーム出力部から照射された前記レーザビームが前記ポリゴンミラーに形成された前記ミラーに到達した際のビーム径が、当該ミラーの一端に接してから、当該ミラーの他端に接するまでの間に、前記ポリゴンミラーで反射した前記レーザビームが前記対象物に到達した際のビーム径が、前記対象物の表面で移動する前記ポリゴンミラーの前記回転軸の方向に沿った長さを、有効走査長さLsとし、
前記ポリゴンミラーの前記回転軸の方向に沿った前記レーザ走査装置の幅をWとした場合に、W<Lsを満たす、
態様1に記載のレーザ走査装置。
前記光学系は、
前記ポリゴンミラーで反射した前記レーザビームを反射し前記レーザビームの走査方向を変化させる反射ミラーと、
前記反射ミラーで反射した前記レーザビームを前記対象物に反射する集光ミラーと、
前記反射ミラーと前記集光ミラーとを支持し、前記反射ミラーと前記集光ミラーとの間の前記レーザビームの光路を含む平面に沿って回転する回転部材と、
を備える、
態様1又は2に記載のレーザ走査装置。
対象物の表面をレーザビームで走査するレーザ走査方法であって、
レーザビーム出力部を用いて、前記レーザビームを照射するレーザビーム出力ステップと、
多角形の頂面及び底面を有する角柱状であり、前記頂面及び前記底面を除く少なくともいずれか一つの面がミラーで形成されており、前記頂面及び前記底面を貫く軸を回転軸として回転するポリゴンミラーを用いて、前記レーザビーム出力部から照射された前記レーザビームを前記ミラーで反射させる反射ステップと、
光学系を用いて、前記ポリゴンミラーで反射した前記レーザビームを前記対象物の表面に導く導光ステップと、
を有し、
前記ポリゴンミラーの前記回転軸は、前記対象物の表面と平行で、前記レーザビームが走査される方向と略平行である、
レーザ走査方法。
態様1に記載のレーザ走査装置を、電磁鋼板又は電磁鋼板に形成される鋼板の板幅方向に複数並べて配置し、前記電磁鋼板又は前記電磁鋼板に形成される鋼板の表面を前記レーザビームで走査して加工する、
レーザ加工装置。
態様1に記載のレーザ走査装置を、電磁鋼板又は電磁鋼板に形成される鋼板の板幅方向に複数並べて配置し、前記電磁鋼板又は前記電磁鋼板に形成される鋼板の表面をレーザビームで走査して加工する、
電磁鋼板の製造方法。
また、本明細書からは、以下の他の態様が概念化される。
対象物の表面をレーザビームで走査するレーザ走査装置であって、
前記レーザビームを照射するレーザビーム出力部と、
多角形の上面及び下面を有する角柱状であり、前記上面及び前記下面を除く少なくともいずれか一つの面がミラーで形成されており、前記上面及び前記下面を貫く軸を回転軸として回転して、前記レーザビーム出力部から照射された前記レーザビームを前記ミラーで反射させるポリゴンミラーと、
前記ポリゴンミラーで反射した前記レーザビームを前記対象物の表面に導く光学系と、を有し、
前記ポリゴンミラーの前記回転軸は、前記対象物の表面と平行で、前記レーザビームが走査される方向と略平行である、
レーザ走査装置。
前記ポリゴンミラーの回転に伴って、前記レーザビーム出力部から照射された前記レーザビームが前記ポリゴンミラーに形成された前記ミラーに到達した際のビーム径が、当該ミラーの一端に接してから、当該ミラーの他端に接するまでの間に、前記ポリゴンミラーで反射した前記レーザビームが前記対象物に到達した際のビーム径が、前記対象物の表面で移動する前記ポリゴンミラーの前記回転軸の方向に沿った長さを、有効走査長さLsとし、
前記ポリゴンミラーの前記回転軸の方向に沿った前記レーザ走査装置の幅をWとした場合に、W<Lsを満たす、
他の態様1に記載のレーザ走査装置。
対象物の表面をレーザビームで走査するレーザ走査方法であって、
レーザビーム出力部を用いて、前記レーザビームを照射するレーザビーム出力ステップと、
多角形の上面及び下面を有する角柱状であり、前記上面及び前記下面を除く少なくともいずれか一つの面がミラーで形成されており、前記上面及び前記下面を貫く軸を回転軸として回転するポリゴンミラーを用いて、前記レーザビーム出力部から照射された前記レーザビームを前記ミラーで反射させる反射ステップと、
光学系を用いて、前記ポリゴンミラーで反射した前記レーザビームを前記対象物の表面に導く導光ステップと、
を有し、
前記ポリゴンミラーの前記回転軸は、前記対象物の表面と平行で、前記レーザビームが走査される方向と略平行である、
レーザ走査方法。
他の態様1に記載のレーザ走査装置を、電磁鋼板又は電磁鋼板に形成される鋼板の板幅方向に複数並べて配置し、前記電磁鋼板又は前記電磁鋼板に形成される鋼板の表面を前記レーザビームで走査して加工する、
レーザ加工装置。
他の態様1に記載のレーザ走査装置を、電磁鋼板又は電磁鋼板に形成される鋼板の板幅方向に複数並べて配置し、前記電磁鋼板又は前記電磁鋼板に形成される鋼板の表面をレーザビームで走査して加工する、
電磁鋼板の製造方法。
12 レーザビーム出力部
14 平面ミラー
16 ポリゴンミラー
18 光学系
20 モータ
22 ミラー面
24 回転軸
26 第1ミラー
28 第2ミラー
30 集光ミラー
40 電磁鋼板
42 被加工部
50 レーザ加工装置
60 レーザ走査装置
62 第1回転部材
63 第2回転部材
64 穴
70 レーザ加工装置
80 レーザ走査装置
82 第1レーザ走査部
84 第2レーザ走査部
92 レーザビーム出力部
94 ミラー
96 ポリゴンミラー
98 光学系
106 第1ミラー
108 第2ミラー
110 集光ミラー
120 レーザ加工装置
130 レーザ走査装置
140 レーザ加工装置
B レーザビーム
B1 第1レーザビーム
B2 第2レーザビーム
Claims (6)
- 対象物の表面をレーザビームで走査するレーザ走査装置であって、
前記レーザビームを照射するレーザビーム出力部と、
多角形の頂面及び底面を有する角柱状であり、前記頂面及び前記底面を除く少なくともいずれか一つの面がミラーで形成されており、前記頂面及び前記底面を貫く軸を回転軸として回転して、前記レーザビーム出力部から照射された前記レーザビームを前記ミラーで反射させるポリゴンミラーと、
前記ポリゴンミラーで反射した前記レーザビームを前記対象物の表面に導く光学系と、を有し、
前記ポリゴンミラーの前記回転軸は、前記対象物の表面と平行で、前記レーザビームが走査される方向と略平行である、
レーザ走査装置。 - 前記ポリゴンミラーの回転に伴って、前記レーザビーム出力部から照射された前記レーザビームが前記ポリゴンミラーに形成された前記ミラーに到達した際のビーム径が、当該ミラーの一端に接してから、当該ミラーの他端に接するまでの間に、前記ポリゴンミラーで反射した前記レーザビームが前記対象物に到達した際のビーム径が、前記対象物の表面で移動する前記ポリゴンミラーの前記回転軸の方向に沿った長さを、有効走査長さLsとし、
前記ポリゴンミラーの前記回転軸の方向に沿った前記レーザ走査装置の幅をWとした場合に、W<Lsを満たす、
請求項1に記載のレーザ走査装置。 - 前記光学系は、
前記ポリゴンミラーで反射した前記レーザビームを反射し前記レーザビームの走査方向を変化させる反射ミラーと、
前記反射ミラーで反射した前記レーザビームを前記対象物に反射する集光ミラーと、
前記反射ミラーと前記集光ミラーとを支持し、前記反射ミラーと前記集光ミラーとの間の前記レーザビームの光路を含む平面に沿って回転する回転部材と、
を備える、
請求項1又は2に記載のレーザ走査装置。 - 対象物の表面をレーザビームで走査するレーザ走査方法であって、
レーザビーム出力部を用いて、前記レーザビームを照射するレーザビーム出力ステップと、
多角形の頂面及び底面を有する角柱状であり、前記頂面及び前記底面を除く少なくともいずれか一つの面がミラーで形成されており、前記頂面及び前記底面を貫く軸を回転軸として回転するポリゴンミラーを用いて、前記レーザビーム出力部から照射された前記レーザビームを前記ミラーで反射させる反射ステップと、
光学系を用いて、前記ポリゴンミラーで反射した前記レーザビームを前記対象物の表面に導く導光ステップと、
を有し、
前記ポリゴンミラーの前記回転軸は、前記対象物の表面と平行で、前記レーザビームが走査される方向と略平行である、
レーザ走査方法。 - 請求項1に記載のレーザ走査装置を、電磁鋼板又は電磁鋼板に形成される鋼板の板幅方向に複数並べて配置し、前記電磁鋼板又は前記電磁鋼板に形成される鋼板の表面を前記レーザビームで走査して加工する、
レーザ加工装置。 - 請求項1に記載のレーザ走査装置を、電磁鋼板又は電磁鋼板に形成される鋼板の板幅方向に複数並べて配置し、前記電磁鋼板又は前記電磁鋼板に形成される鋼板の表面をレーザビームで走査して加工する、
電磁鋼板の製造方法。
Priority Applications (6)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US18/549,361 US20240139869A1 (en) | 2021-03-30 | 2022-03-30 | Laser scanning device, laser scanning method, laser processing device, and electrical steel sheet manufacturing method |
BR112023019654A BR112023019654A2 (pt) | 2021-03-30 | 2022-03-30 | Dispositivos de varredura a laser e de processamento a laser, e, métodos de varredura a laser de varrer uma superfície de um objeto com um feixe de laser e de fabricação de chapa de aço elétrico |
KR1020237031596A KR20230145591A (ko) | 2021-03-30 | 2022-03-30 | 레이저 주사 장치, 레이저 주사 방법, 레이저 가공 장치 및 전자 강판의 제조 방법 |
JP2023511691A JPWO2022210995A1 (ja) | 2021-03-30 | 2022-03-30 | |
EP22781205.4A EP4318075A1 (en) | 2021-03-30 | 2022-03-30 | Laser scanning device, laser scanning method, laser processing device, and electrical steel plate manufacturing method |
CN202280021118.5A CN116981977A (zh) | 2021-03-30 | 2022-03-30 | 激光扫描装置、激光扫描方法、激光加工装置以及电磁钢板的制造方法 |
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Citations (6)
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JP2001062577A (ja) * | 1999-08-31 | 2001-03-13 | Toppan Forms Co Ltd | レーザ加工装置 |
WO2003103887A1 (de) * | 2002-06-07 | 2003-12-18 | Mlt Micro Laser Technology Gmbh | Vorrichtung zur substratbehandlung mittels laserstrahlung |
JP2004191863A (ja) * | 2002-12-13 | 2004-07-08 | Ricoh Co Ltd | 光走査用ミラー、光走査方法、光走査装置及び画像形成装置 |
CN101804518A (zh) * | 2010-04-02 | 2010-08-18 | 苏州市博海激光科技有限公司 | 多激光器并联式卷烟接装纸激光打孔方法及设备 |
JP2018507111A (ja) | 2014-12-24 | 2018-03-15 | ポスコPosco | 鋼板表面の溝形成方法およびその装置 |
JP2021058353A (ja) | 2019-10-04 | 2021-04-15 | 株式会社藤商事 | 遊技機 |
-
2022
- 2022-03-30 CN CN202280021118.5A patent/CN116981977A/zh active Pending
- 2022-03-30 US US18/549,361 patent/US20240139869A1/en active Pending
- 2022-03-30 JP JP2023511691A patent/JPWO2022210995A1/ja active Pending
- 2022-03-30 EP EP22781205.4A patent/EP4318075A1/en active Pending
- 2022-03-30 BR BR112023019654A patent/BR112023019654A2/pt unknown
- 2022-03-30 WO PCT/JP2022/016369 patent/WO2022210995A1/ja active Application Filing
- 2022-03-30 KR KR1020237031596A patent/KR20230145591A/ko unknown
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
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JP2001062577A (ja) * | 1999-08-31 | 2001-03-13 | Toppan Forms Co Ltd | レーザ加工装置 |
WO2003103887A1 (de) * | 2002-06-07 | 2003-12-18 | Mlt Micro Laser Technology Gmbh | Vorrichtung zur substratbehandlung mittels laserstrahlung |
JP2004191863A (ja) * | 2002-12-13 | 2004-07-08 | Ricoh Co Ltd | 光走査用ミラー、光走査方法、光走査装置及び画像形成装置 |
CN101804518A (zh) * | 2010-04-02 | 2010-08-18 | 苏州市博海激光科技有限公司 | 多激光器并联式卷烟接装纸激光打孔方法及设备 |
JP2018507111A (ja) | 2014-12-24 | 2018-03-15 | ポスコPosco | 鋼板表面の溝形成方法およびその装置 |
JP2021058353A (ja) | 2019-10-04 | 2021-04-15 | 株式会社藤商事 | 遊技機 |
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JPWO2022210995A1 (ja) | 2022-10-06 |
US20240139869A1 (en) | 2024-05-02 |
KR20230145591A (ko) | 2023-10-17 |
CN116981977A (zh) | 2023-10-31 |
BR112023019654A2 (pt) | 2023-10-31 |
EP4318075A1 (en) | 2024-02-07 |
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