WO2004101211A1 - レーザ加工装置 - Google Patents
レーザ加工装置 Download PDFInfo
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- WO2004101211A1 WO2004101211A1 PCT/JP2004/007129 JP2004007129W WO2004101211A1 WO 2004101211 A1 WO2004101211 A1 WO 2004101211A1 JP 2004007129 W JP2004007129 W JP 2004007129W WO 2004101211 A1 WO2004101211 A1 WO 2004101211A1
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- WIPO (PCT)
- Prior art keywords
- laser
- laser beam
- polarization
- optical path
- focal position
- Prior art date
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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
- B23K26/02—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
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
- B23K26/0613—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams having a common axis
-
- 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
- B23K26/0604—Shaping the laser beam, e.g. by masks or multi-focusing by a combination of beams
-
- 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
- B23K26/066—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms by using masks
-
- 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
- B23K26/067—Dividing the beam into multiple beams, e.g. multifocusing
-
- 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
-
- 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
- B23K26/083—Devices involving movement of the workpiece in at least one axial direction
- B23K26/0853—Devices involving movement of the workpiece in at least in two axial directions, e.g. in a plane
-
- 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
- B23K26/38—Removing material by boring or cutting
- B23K26/382—Removing material by boring or cutting by boring
Definitions
- the present invention relates to a laser processing machine whose main purpose is drilling a workpiece such as a pudding board, and the like. It is intended to improve quality.
- the laser beam that has passed through the mask is split into a plurality of light beams via a half mirror, and the split laser beams are guided to a plurality of galvano scanner systems arranged on the incident side of the f ⁇ lens, respectively. By scanning, it is possible to irradiate the processing area set in division.
- the split laser beam is introduced into the half of the f ⁇ lens via the first galvano scanner system.
- the other laser beam split is introduced into the other half of the f0 lens via the second galvano scanner system, and the first and second galvanoscanner systems are symmetrical with respect to the central axis of the f0 lens.
- f ⁇ lenses can be used at the same time for each ⁇ Z 2 to improve productivity.
- Patent Document 1 Japanese Unexamined Patent Publication No. 1 1 1 3 1 4 1 8 8 (Page 3, Fig. 1)
- each of the two laser beams split into a plurality of parts through a half mirror 1st galvo scanner system and 2nd galvo Since it is configured to scan with a Nosquiana system and irradiate a split I / O laser, the difference between the two laser beams dispersed by the half mirror is reflected and transmitted by the half mirror. Quality variations are likely to occur, and if the spectroscopic energy is different, more expensive optical components are required to equalize the energy.
- Another problem is that the optical path lengths of the two laser beams that have been split after passing through the mask differ from each other until the workpiece is irradiated, and the exact beam spot diameter on the workpiece is also different. there were.
- an object of the present invention is to provide a laser processing apparatus that can improve productivity at a lower cost by irradiating the same region with a laser beam that has been dispersed.
- the laser beam emitted from the oscillator is transmitted by the first polarizing means and reflected by the second polarizing means via the mirror.
- the third polarizing means for adjusting the polarization angle that can adjust the angle is arranged in front of the first polarizing means. .
- the laser beam emitted from the oscillator is transmitted by the first polarization unit, reflected by the second polarization unit via the mirror, and reflected by the first polarization unit.
- Laser that scans in two axes with the first galvano scanner splits it into the second laser beam that has passed through the second polarizing means, and scans the workpiece with the second galvano scanner
- the processing device measures the focal position of the two laser beams on the basis of the measuring means that measures the focal position of the laser beams, and focuses the focal point so that the difference between the focal positions of the two laser beams is less than the desired reference. It is adjusted by the position adjusting means.
- FIG. 1 is a diagram showing a schematic configuration of a laser beam machine according to Embodiment 1 of the present invention.
- FIG. 2 is a schematic diagram of the spectrum of the polarization beam splits.
- FIG. 3 is a diagram showing a schematic configuration of a laser beam machine according to Embodiment 2 of the present invention.
- FIG. 4 is an enlarged view of the polarization beam splitter portion for adjusting the polarization angle.
- FIG. 5 is a flow diagram of the automatic adjustment prod- uct for the polarization beam splitting for adjusting the polarization angle.
- FIG. 6 is a diagram showing a schematic configuration of the laser beam machine according to the third embodiment of the present invention.
- FIG. 7 is a diagram schematically showing changes in the focal point position in the laser beam machine according to Embodiment 3 of the present invention.
- FIG. 8 is a view showing a schematic configuration of the laser beam machine according to Embodiment 4 of the present invention.
- FIG. 9 is a diagram schematically showing changes in the focal point position in the laser beam machine according to the fourth embodiment of the present invention.
- FIG. 10 is a schematic diagram showing a change in the deflection direction of the laser beam in the laser beam machine according to the fourth embodiment of the present invention.
- Fig. 11 is a flowchart of the automatic focus position adjustment product ⁇ by the focus position variable means.
- Fig. 1 shows a drilling hole where two laser beams can be scanned simultaneously by splitting one laser beam into two laser beams using a polarizing beam splitter for spectroscopy.
- 1 is a schematic configuration diagram showing a laser processing apparatus.
- 1 is the laser oscillator
- 2 is the laser beam
- 2 a is the retarder 3 the polarization direction of the laser beam 2 before incidence
- 2 b is the polarization direction of the laser beam 2 after being reflected by the retarder 3
- 3 is a straight line
- 4 is a mask that cuts out the necessary part of the laser light from the incident laser light to make the processing hole the desired size and shape
- 5 reflects the laser light 2
- 6 is a first polarization beam splitter that splits the laser beam 2 into two laser beams
- 7 is one laser beam that is split by the first polarization beam splitter 6
- 7 a is the polarization direction of the laser beam
- 8 is the other laser beam split by the first polarized beam split
- 8a is the polarization of the laser beam 8.
- Direction, 9 is the second polarization beam splitter for guiding the laser beam 7 and the laser beam 8 to the galvano scanner 12, 10 is for condensing the laser beam 7, 8 on the workpiece 1 3 f 0 lens, 1 1 is the first galvanometer for scanning the laser beam 8 biaxially and leading to the second polarization beam splitting, 1 2 is the laser beam 7 and laser beam 8 biaxially A second galvano scanner for scanning and leading to the workpiece 22, 13 is the workpiece, and 14 is an XY stage for moving the workpiece 13.
- optical path lengths until the laser beams 7 and 8 split by the first modified beam splitter 6 reach the second polarizing beam splitter 8 are designed to be the same optical path length.
- one laser beam is split into two laser beams using a spectral polarization beam splitter, and the two laser beams are scanned independently, thereby simultaneously processing two locations.
- the laser light 2 oscillated by the linearly polarized light from the laser oscillator 1 is converted into circularly polarized light by the retarder 3 arranged in the middle of the optical path, and the mask 4, The light is guided to the first polarization beam splitter 6 via the mirror 1.
- the laser beam 2 incident as circularly polarized light has the P wave component transmitted through the polarization beam splitter 6 to become the laser beam 7, and the S wave component reflected by the polarized beam splitter 6.
- the laser 7 and the laser light 8 are split so as to have the same energy.
- the laser beam 7 that has passed through the first polarization beam splitter 6 is guided to the second polarization beam splitter 9 via the bend mirror 1.
- the laser beam 8 reflected by the first beam splitter 6 is scanned in the biaxial direction by the first galvano scanner 11 and then guided to the second polarization beam splitter 9.
- the laser beam 7 is always guided to the second polarizing beam splitter 9 at the same position, but the laser beam 8 is controlled by controlling the swing angle of the first galvano scanner 11. The position and angle incident on 9 can be adjusted.
- the laser beams 7 and 8 are scanned in the two-axis directions by the second galvano scanner 12, and then guided to the f 0 lens 10, and are condensed at predetermined positions on the workpiece 13, respectively.
- the laser beam 8 can be irradiated on the workpiece 13 at the same position as the laser beam 7.
- the galvano scanner 11 by scanning the galvano scanner 11 at an arbitrary position within the preset range, for example, by scanning the galvano scanner 11, the characteristics of the optical element of the beam splitter with the laser beam 7 as the center are changed. Taking into account, scan within the range of 4 mm square and, for example, 2 different galvano scanners that swing within a range that can be machined by 50 mm square, etc. Can be irradiated with laser light. Further, in the present embodiment, the laser beam 8 reflected from the first polarization beam splitter 6 is transmitted through the second polarization beam splitter 9, and the laser beam 7 transmitted through the first polarization beam splitter 6 is The second polarizing beam splitter 9 is configured to reflect.
- the two laser beams that have undergone spectroscopy have undergone both reflection and transmission processes. This makes it possible to offset the disruption of energy balance.
- the quality of the processed hole processed into the workpiece 13 by the laser beam 7 and the laser beam 8 greatly depends on the energy of the laser beam.
- the first polarization beam splitter 6 that splits the laser beam 2 into the laser beam 7 and the laser beam 8 is used to transmit the P wave and reflect the S wave. Spectroscopy into laser beam.
- FIG. 2 shows a front view of the first polarizing beam splitter 6 in the center, a side view on the left and right, and a top view on the top.
- 6 ⁇ is the optical element part of the polarization beam splitter, and in the case of a carbon dioxide laser, ZnSe and Ge are used.
- 62 is a mirror for folding the laser beam to 90 °.
- the laser beam incident on the polarization beam splitter 6 has the property that the component in the polarization direction 7a (P wave component) is transmitted and the component in the polarization direction 8a (S wave component) is reflected.
- the polarization direction of the incident laser light is the same as the polarization direction 7 a (P wave component), it is all transmitted, and if it is the same as the polarization direction 8 a (S wave component), it is all reflected.
- the laser beam is equally divided into circularly polarized light in which all polarization directions exist homogeneously, and the polarization direction that forms an angle of 45 ° with the P wave and S wave.
- the light 8 has the same energy.
- the laser beam 8 between the first polarization beam splitter 6 and the second polarization beam splitter 9 and Since the optical path length of 7 is the same, the beam spot diameters of the two separated laser beams can be made the same.
- the same optical path length is obtained.
- the optical path length of laser beams 8 and 7 can be kept the same. Embodiment 2.
- the laser light 2 oscillated from the laser oscillator 1 needs to be incident on the retarder 3 at an angle where the incident light and the reflected light form 90 °, and the polarization direction of the laser light 2 2a must be incident on the retarder 3 at an angle of 45 ° with respect to the intersecting line between the plane having the incident optical axis and the reflected optical axis as two sides and the reflecting surface of the retarder 3.
- the circular polarization rate decreases, and the laser beam enters the first polarization beam splitter 6.
- the balance of the P-wave component and S-wave component of the light 2 is lost, and the energy of the laser light 7 and the laser light 8 is not uniform, the polarization direction when entering the retarder 3 of the laser light 2, and
- the polarization direction is invisible, and the optical axis angle is not visible when the light beam is not visible as in the case of a carbon dioxide laser, so the circular polarization rate is measured. It must be repeated, and it is a very complicated work There are also cases where it becomes a business.
- the laser beam 2 is changed to circularly polarized light 2b, it is reflected by several mirrors 5 until it enters the first polarizing bi-axial splitter 6, but when reflected by the mirror 5, it is circularly polarized light.
- the rate may decrease.
- FIG. 3 is a schematic configuration diagram showing a laser processing apparatus according to an embodiment of the present invention.
- 2c is the polarization direction of the laser light 2 before entering the third polarization beam splitter 15 and 2d is the polarization direction of the laser light 2 after passing through the third polarization beam splitter 15 , 15 is a third polarization beam splitter for adjusting the polarization direction of the laser beam 2, 16 is a power sensor for measuring the energy of the laser beam emitted from the f0 lens 10, and 17 is a laser beam.
- the first shutter that blocks 7, and 18 is the second shutter that blocks laser light 8.
- the power sensor 16 is fixed to the XY table 14 and when the energy of the laser beam is measured, the power sensor 16 can be moved to a position where the laser beam hits the light receiving part of the power sensor 16. ing.
- FIG. 4 is a detailed view of the third polarizing bean split 15 shown in FIG.
- 20 is a servo motor
- 2 1 is a bracket for fixing the third polarizing beam splitter 15 and the servo motor
- 2 2 is the power of the servo motor 20 to the third polarizing beam splitter 1 5
- the timing bell ⁇ ⁇ ⁇ , 2 3 is attached to the servo motor 20 and the timing bell ⁇ 2 2
- the first pulley that transmits the power of the thermomotor 20, 24 is the second pulley that is attached to the third polarizing beam splitter 15 and is rotated by the timing bell ⁇ 2
- 25 is the third pulley
- This is a damper that receives the S wave component of the laser beam 2 reflected by the polarizing beam splitter 15.
- the laser beam 2 is oscillated by the linearly polarized light 2 c from the laser oscillator 1, reflected by the mirror 5, and guided to the third polarization beam splitter 15.
- the P wave component of the laser beam 2 passes through the third polarization beam splitter 15, changes its polarization direction to linearly polarized light 2 d having an angle different from that of the linearly polarized light 2 c, and is guided to the mask 4.
- the S wave component of the laser beam 2 is reflected by the third polarization beam splitter 15 and absorbed by the damper 25.
- the laser beam 2 transmitted through only a desired portion in the mask 4 is reflected by the mirror 5 and guided to the first polarization beam splitter 6. '
- the P-wave component of the laser light is transmitted through the first polarization beam splitter 6 (laser light 7), and the S-wave component is the first polarization beam splitter 6.
- the laser beam 7 is reflected by the mirror 5, guided to the second polarization beam splitter 9, and then guided to the second galvano scanner 12 and scanned in the X and Y directions, and the f0 lens.
- Workpiece 1 3 focused on 1 0 and mounted on XY table 1 4 is processed.
- the laser beam 8 is scanned in the X and Y directions by the first galvano scanner 11 and guided to the second polarization beam splitter 9.
- the second galvano scanner 12 scans again in the X direction and the Y direction, and then the light is collected by the f 0 lens ⁇ 0 and processed on the workpiece 13 mounted on the XY table 14.
- the ratio of the P wave component and the S wave component incident on the first polarization beam splitter 6 can be changed.
- linearly polarized laser light it is only necessary to change the polarization angle 2 d of the incident laser light 2 c , except for the loss at the first polarizing beam splitter 6, production errors, etc.
- the laser beam 2 in the polarization direction is incident, all the laser beam 7 is transmitted, and if the laser beam 2 having the same polarization direction as the S wave is incident, all the laser beam 8 is reflected.
- the laser beam 2 may be incident at a polarization angle of.
- the polarization angle 2 c when the laser beam 2 is oscillated from the laser oscillator 1 is determined by the optical structure of the laser oscillator 1, the polarization angle cannot be easily changed.
- the laser beam 2 is passed through the third polarization beam splitter 15, only the P wave component is transmitted and the S wave component is reflected. Therefore, by changing the third polarization beam splitter 15 angle, the laser The polarization angle 2c of the light 2 can be easily changed. As described above, the S wave component of the laser beam 2 reflected by the third polarizing beam splitter 15 is received by the damper 25.
- the third polarizing beam splitter 15 When adjusting the angle of the polarization direction with the third polarizing beam splitter 15, the S-wave component is not transmitted and lost, so when using laser light efficiently, the third polarizing beam splitter 15
- the polarization angle 2c of the laser beam 2 before incidence (the polarization angle when oscillated from the laser oscillator 1) is as close as possible to the polarization angle 2d of the laser beam 2 after passing through the third polarization beam splitter 15 Just design. In such a design, the angle adjustment amount of the third polarization beam splitting is sufficient to compensate for the manufacturing error of each optical system part, and the energy loss in this part is less than several percent. .
- the angle adjustment mechanism of the third polarization beam splitter 15 is as shown in FIG.
- the third polarizing beam splitter 15 is fixed to the bracket 2 1 so that it can rotate around the optical axis of the laser beam 2 and rotates together with the third polarizing beam splitter 15.
- the second pulley 24 is fixed.
- the support motor 20 to which the first pulley 23 is attached is also fixed to the bracket 21, and the servo is connected to the second pulley 24 and the servo connected to the third polarization beam splitter 15.
- the first pulley 23 fixed to the motor 20 is connected by a timing bell 22.
- the S wave component of the laser light 2 reflected by the third polarizing beam splitter 15 can be received by the damper 25.
- the polarization angle 20 of the laser beam 2 before the polarization beam splitter 15 is preferably incident on the same angle as possible with the polarization angle 2 d of the laser beam 2 after the third polarization beam splitter 15.
- the adjustment of the angle of the third polarization beam splitter 15 5 makes the role of finely adjusting the polarization angle 2 d because the laser beam 2 is incident on the first polarization beam splitter 6 at an accurate polarization angle.
- FIG. 5 shows a flow for automatically adjusting the angle of the polarization beam splitter for adjusting the polarization angle so that two laser beams can be extracted at a desired ratio of energy in the embodiment of the present invention.
- the allowable energy difference between the laser beam 7 and the laser beam 8 is determined and input to a control device not described in the figure, and the automatic angle adjustment program for the third polarization beam splitter 15 is executed.
- the light receiving part of the power sensor 1 6 fixed to the XY table 1 4 is f
- the power sensor 16 moves to a position where the laser light emitted from the 0 lens 10 can be received.
- the second shutter 18 is closed, and laser light is oscillated from the laser oscillator 1.
- the laser beam 8 is blocked at that portion, and only the laser beam 7 is emitted from the f 0 lens 10, and the energy of the laser beam 7 is measured by the power sensor 16. Is done.
- the energy difference between the two laser beams measured in the control unit is calculated and compared with the tolerance entered at the beginning.
- the program ends, but if it is outside the tolerance, adjust the angle of the third polarizing beam splitter 15 and measure the energy of the two laser beams again. The above operation is repeated until.
- the angle adjustment amount of the third polarization beam splitter 15 depends on the polarization direction 2 c of the incident laser beam 2 and the mounting angle of the first polarization beam splitter 6.
- the third polarization beam splitter 1 5 If the polarization angle 2d of the laser beam 2 after transmission is changed from the polarization angle 2c of the laser beam 2 before the incident by a few degrees from the polarization angle 2c of the laser beam 2 before the incident, the third polarization beam splitter 1 It can be theoretically derived that the energy difference of about 7% per angle of 5 can be adjusted.
- the relationship between the adjustment angle of the third polarizing beam splitter 15 and the energy difference between the two laser beams is as follows: the polarization angle 2 c of the incident laser beam 2 and the mounting angle of the first polarizing beam splitter 6 Therefore, if the allowable value is about 5%, the adjustment (program) will be completed if the above adjustment loop is executed twice. Easy adjustment in time.
- one laser beam is split into two laser beams using a spectral polarization beam splitter, and the two laser beams are scanned independently, thereby simultaneously processing two locations.
- the polarization angle of the laser beam can be changed with respect to the P wave (transmitted wave) and S wave (reflected wave) of the polarization polarization split beam.
- a polarizing beam splitter for adjusting the polarization angle is set in front of this, and a mechanism capable of adjusting the angle is provided in the polarizing beam splitter for adjusting the polarization angle, and the angle can be adjusted by a command from the control device.
- a sensor that can measure the energy of the laser beam is provided, the energy of the two laser beams is measured, and the angle of the polarization beam splitter for adjusting the polarization angle is automatically adjusted so that the two laser beams can be extracted at the desired ratio.
- the ability to adjust makes it possible to reduce the setup time of the Lie layer, and the ease of adjustment eliminates the need for operator skill and realizes stable machining.
- the beam spot diameter is made the same by making the optical path lengths the same. Since the two laser beams are scanned so that they are irradiated at different positions and are guided to the same f ⁇ lens, they pass through different optical paths. May change and the focal positions of the two laser beams may be different, resulting in differences in processing quality (hole diameter, hole depth, roundness, etc.).
- the galvanometer mirror is lightened to improve the driving speed of the galvano scanner, and the polarization beam splitter is mounted with an optical element that reflects or transmits the laser beam. Because it is fixed to the part and integrated, the variation is suppressed due to its characteristics. It was difficult to manufacture, and the focal position of the laser beam was a different factor.
- FIG. 6 is a schematic configuration diagram showing a laser processing apparatus according to an embodiment of the present invention.
- 30 is a first deformable mirror that is a first focal position varying means for laser light 7
- 3 1 is a second deformable mirror that is a second focal position varying means for laser light 7
- Reference numeral 2 denotes a CCD camera which is an image sensor for measuring the hole diameter, hole position, etc. of a machined hole by laser light.
- the third polarization beam splitter in the present embodiment is for energy adjustment, and has a different function than the focus position adjustment in the present embodiment.
- the sixth embodiment of the present embodiment is added to the system of FIG. 1 by adding to the system of FIG.
- the laser light 7 transmitted through the first polarizing beam splitter 6 is guided to the second polarizing beam splitter 7 via the first deformable mirror 30 and the second deformable mirror 3 1.
- the laser beam 8 reflected by the first beam splitter 6 is scanned in the biaxial direction by the first galvano scanner 11 and then guided to the second polarization beam splitter 9.
- FIG. 7 is a schematic diagram showing a change in the focal position of the laser beam 7 when the deformable mirror 30 is deformed into a concave shape, for example, in the laser processing apparatus according to the embodiment of the present invention.
- 4 is a mask
- 10 is an f 0 lens (focal length F)
- 30 is a deformable mirror (focal length f)
- 3 3 is a focus when an image of the mask 4 is transferred by the f 0 lens 10.
- the mask 4 can be considered to be at a virtual position 34.
- the distance b 1 between the virtual mask position 34 and the deformable mirror 3 0 can be expressed by equation (2) when the deformable mirror — 3 0 is considered equivalent to a lens with the focal length f. (2)
- bl can be obtained from equation (3).
- Equation (3) The right side of Equation (3) obtained here is multiplied by ⁇ 1. This is because the focal length f of the deformable mirror 30 is extremely large, so solving Equation (3) gives b 1 This is because the value becomes negative.
- the virtual mask position 34 to f 0 lens 10 The relationship between the distance a 2 and f 0 lens 10 0 to the focal position after change 3 5 is the distance between the work distance b 2 and the virtual mask position 34 to f. 0 Distance to lens 10 0. a 2 can be expressed by equation (5).
- Equation (6) can be derived from Equation (4) and Equation (5).
- the focal length f of the first deformable mirror 30 and the second deformable mirror 3 1 in equation (3) Then, b 1 can be obtained, and the work distance b 2 of laser light 7 can be obtained from Eq. (6).
- the work distance b 2 of the laser beam 7 can be freely changed.
- Deformable mirror 3 0, 3 1 to f 0 Lens 1 0 Distance to d 1 f 0 Lens 1 0 Focal length
- the laser beam 8 stroke distance B 106.309 mm, and at this time, the work distance of the laser beam 7 is O with respect to the laser beam 8.
- you can calculate the focal length b 1 1525.54mm, and adjust the deformable mirrors 3 0 and 3 1 to achieve this focal length.
- the deformable mirror can obtain the same effect even when it is convex, and in this case, the focal position of the laser beam 7 can be increased.
- the focal length f of the first deformable mirror 30 or the second deformable mirror 31 is changed independently of the focal position when transferring the laser beam, and there is a difference in the focal position due to variations in the optical components through which the laser beam 8 and the laser beam 7 pass.
- the focal length f of the deformable mirrors 3 0 and 3 1 is determined by measuring the shift amount of the focal position of the laser light 7 with the focal position of the laser light 8 as a reference. This makes it possible to minimize the difference in focal position.
- a method of adjusting the focal distance of only one of the first deformable mirror 30 and only the second deformable mirror 31; Adjusting the focal length of both the first deformable mirror 30 and the second deformable mirror 1 3 1 and changing the focal point position with either of the deformable mirrors is equivalent to the amount of focal position change.
- the two deformable mirrors are twisted with respect to each other.
- the deformable mirror 30 is perpendicular to the plane including the optical paths in the X direction and the Z axis direction, and the X direction and the Z direction. 4 5 for an optical path angle of 90 ° in the axial direction.
- the deformable mirror 3 1 has optical paths in the Z and Y axis directions.
- the effect of the focal length of the two deformable mirrors when it is placed perpendicular to the containing plane and 45 ° normal to the 90 ° optical path angle in the Z and Y directions By changing the focal position of the laser beam 7 and making the focal lengths of the two deformable mirrors equal, there is an effect of reducing aberrations caused by inserting a deformable mirror in the optical path. This makes it possible to carry out more stable quality processing.
- a laser processing apparatus in which means for changing the optical path length is added as focus position adjusting means when the focus positions of the two laser beams subjected to spectroscopy are different.
- FIG. 8 is a schematic configuration diagram showing a laser processing apparatus according to an embodiment of the present invention.
- reference numeral 37 denotes a part of the focal position changing means, which is a first movable mirror having a structure that can be translated in parallel to the X axis and that can change the angle with an axis parallel to the Y axis as a fulcrum.
- 36 is a part of the focal position changing means, so that even if the incident angle changes due to the movement of the first movable mirror 37, the optical path guided to the second polarization beam splitter 9 is not changed.
- This is a second movable mirror having a structure capable of adjusting the angle.
- FIG. 9 shows, for example, the position and angle of the first movable mirror 36 and the second movable mirror 37 in the laser processing apparatus according to the embodiment of the present invention.
- the optical path length between the second movable mirror 3 and the second movable mirror 37 By extending the optical path length between the second movable mirror 3 and the second movable mirror 37, the optical path between the mask 4 to f 0 lens 10 in laser light 7
- the figure t which is a schematic diagram showing changes in the focal position of the laser light 7 when the length is extended
- 4 is a mask
- 10 is an f0 lens with a focal length F1
- 38 is a lens by extending the optical path length.
- the focal length F 1 of the f 0 lens 10 the distance A 1 from the mask 4 to the f ⁇ lens 10, and the distance from the f 0 lens 10 to the focal position 3 9, as in the third embodiment.
- the relationship of a certain work distance B 1 can be expressed by the following equation.
- FIG. 0 shows the first embodiment when the optical path length between the first movable mirror 37 and the second movable mirror 36 is changed and the focal position of the laser beam 7 is moved in the fourth embodiment of the present invention.
- the arrangement of the movable mirror 1 3 7 and the second movable mirror 3 6 and the change of the polarization direction 7 a of the laser beam 7 are shown.
- 7a is the polarization direction of the laser beam 7 incident on the second polarization beam splitter 9 when the optical path length is not changed
- 7b is the first movable mirror 37 and the second movable mirror. The polarization direction of the laser beam 7 when the optical path length between 3 and 6 is changed is shown.
- the polarization direction 7 a of the laser beam 7 matches the S wave component of the second polarization beam splitter 9, so that all the energy of the laser beam 7 is the second polarization beam splitter 9 Is used as the machining energy.
- the polarization direction 7 b of the laser beam 7 is incident with an angle with respect to the S wave component of the second polarization beam splitter 9. Part of the energy that is transmitted is transmitted as the P-wave component of the second polarization beam splitter 9, so energy loss of the laser light 7 occurs in this part.
- the direction of polarization of the laser light transmitted through the third polarization beam splitter 15 is guided at an angle of 45 ° with respect to the S-wave and P-wave of the first polarization beam splitter 6, and the first Even if the energy of the laser beam 8 reflected from one polarization beam splitter 6 and the energy of the transmitted laser beam 7 are made equal, the energy of the laser beam 7 is lost in the second polarization beam ⁇ Split 9 The energy of laser light 8 and laser light 7 cannot be made equal. In such a case, the polarization angle of the third polarization beam splitter 15 is adjusted, and the energy of the laser beam 7 lost by the second polarization beam splitter 9 is canceled out. What is necessary is just to adjust the polarization angle of the laser beam which injects into.
- the energy of the laser beam 7 can be increased by increasing the P-wave component transmitted through the first polarization beam splitter 6, so that the polarization angles of the laser beams incident on the first polarization beam splitter 6 are orthogonal to each other.
- P waves, from the angle of 4 5 ° with respect to S-wave, further to tilt in a direction close to the P-wave, in the embodiment of the third polarization beam splitter 1 5 may be a polarization angle adjustment c the invention
- the laser beam 8 Based on the focal position of As a result, the distance between the first movable mirror 37 and the second movable mirror 36 is determined by measuring the shift amount of the focal position of the laser beam 7, and the difference between the focal positions of the laser beams 8 and 7 is determined. It is possible to minimize.
- the energy loss of the laser light 7 generated at this time can be compensated by adjusting the polarization angle using the third polarization bi-split 15 and the energy of the laser light 8 and the laser light 7 Can be made equal.
- the optical path length is automatically adjusted by the focal length of the two variable mirrors or the two movable mirrors. The flow for this will be described with reference to FIG.
- the workpiece for adjustment 1 3 (for example, an acrylic plate) installed in advance on the XY stage 14 is moved into the processing area of the f 0 lens 10.
- First shutter 1 8 is opened, second shutter 1 7 is closed, and only laser light 8 is processed on the workpiece for confirmation of the focal position, for example, by a driving device (not shown), the first polarizing beam splitter Move the optical path parts between 6 and f 0 lens 10 and the set of CCD camera 3 2 in the Z direction, change the distance between the work piece 1 3 and the f 0 lens 10 in the Z axis direction, By moving XY stage 14, machining with different work distances is performed at different positions.
- the first shutter 17 is opened, the second shutter 18 is closed, and the workpiece is subjected to processing for confirming the focal position using only the laser beam 7.
- the program ends if the difference between the focal positions is within the tolerance value, but the tolerance value is not met. Adjusts the focal length of the deformable mirror or the optical path length by the movable mirror from the difference in the focal positions of the two laser beams 8 and 7, and again performs processing to confirm the focal position of the two laser beams. The above operation is repeated until the value is within the allowable value.
- the third polarizing beam splitter 15 adjusts the energy of the two laser beams to be uniform. Just do it.
- This focus position adjustment is performed regularly, for example, during setup or when the equipment is started up, so that the hole quality of the two laser beams is always higher. Therefore, it is possible to carry out stable machining because the skill level of the operator is not required. According to the present invention, it is possible to make the beam spot diameters substantially the same by minimizing the difference in energy quality of the dispersed laser light and making the optical path lengths the same, thereby improving productivity at low cost. be able to.
Abstract
Description
Claims
Priority Applications (3)
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JP2005506297A JP4466561B2 (ja) | 2003-05-19 | 2004-05-19 | レーザ加工装置 |
DE112004000048T DE112004000048B4 (de) | 2003-05-19 | 2004-05-19 | Laserbearbeitungsvorrichtung |
US10/524,241 US20050247682A1 (en) | 2003-05-19 | 2004-05-19 | Laser beam machine |
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JP2003139962 | 2003-05-19 | ||
JP2003-139962 | 2003-05-19 |
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PCT/JP2004/007129 WO2004101211A1 (ja) | 2003-05-19 | 2004-05-19 | レーザ加工装置 |
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US (1) | US20050247682A1 (ja) |
JP (1) | JP4466561B2 (ja) |
KR (1) | KR100731799B1 (ja) |
CN (1) | CN100393470C (ja) |
DE (1) | DE112004000048B4 (ja) |
TW (1) | TWI275439B (ja) |
WO (1) | WO2004101211A1 (ja) |
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CN101439442B (zh) * | 2007-11-21 | 2012-03-21 | 三菱电机株式会社 | 激光加工装置 |
CN102789066A (zh) * | 2011-05-18 | 2012-11-21 | 旭丞光电股份有限公司 | 激光光束转换装置及方法 |
WO2012176429A1 (ja) * | 2011-06-23 | 2012-12-27 | 東洋製罐株式会社 | 構造体、構造体形成方法及び構造体形成装置 |
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- 2004-05-19 WO PCT/JP2004/007129 patent/WO2004101211A1/ja active Application Filing
- 2004-05-19 DE DE112004000048T patent/DE112004000048B4/de not_active Expired - Fee Related
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WO2021187042A1 (ja) * | 2020-03-16 | 2021-09-23 | 住友重機械工業株式会社 | ビーム分岐装置及び分岐比調整方法 |
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Also Published As
Publication number | Publication date |
---|---|
TWI275439B (en) | 2007-03-11 |
CN100393470C (zh) | 2008-06-11 |
DE112004000048T5 (de) | 2005-08-18 |
CN1700968A (zh) | 2005-11-23 |
KR100731799B1 (ko) | 2007-06-25 |
DE112004000048B4 (de) | 2007-11-08 |
US20050247682A1 (en) | 2005-11-10 |
KR20060012010A (ko) | 2006-02-06 |
JPWO2004101211A1 (ja) | 2006-07-13 |
JP4466561B2 (ja) | 2010-05-26 |
TW200518867A (en) | 2005-06-16 |
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