WO2015159687A1 - 制御装置およびレーザ加工装置 - Google Patents
制御装置およびレーザ加工装置 Download PDFInfo
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- WO2015159687A1 WO2015159687A1 PCT/JP2015/059691 JP2015059691W WO2015159687A1 WO 2015159687 A1 WO2015159687 A1 WO 2015159687A1 JP 2015059691 W JP2015059691 W JP 2015059691W WO 2015159687 A1 WO2015159687 A1 WO 2015159687A1
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- WIPO (PCT)
- Prior art keywords
- laser beam
- wavelength conversion
- output value
- harmonic laser
- conversion crystal
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- 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
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- 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
- B23K26/0648—Shaping the laser beam, e.g. by masks or multi-focusing by means of optical elements, e.g. lenses, mirrors or prisms comprising lenses
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/353—Frequency conversion, i.e. wherein a light beam is generated with frequency components different from those of the incident light beams
- G02F1/354—Third or higher harmonic generation
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/37—Non-linear optics for second-harmonic generation
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
Definitions
- the present invention relates to a control device for controlling an output value of a laser beam and a laser processing device.
- the temperature of the wavelength conversion crystal is adjusted, and if the harmonic laser output exceeding the threshold cannot be obtained even if the temperature adjustment is performed, the wavelength conversion crystal is passed through the optical path. Was moved vertically. Thereby, since the passing point in the wavelength conversion crystal of the harmonic laser beam is updated, the output value of the harmonic laser beam can be recovered.
- the present invention has been made in view of the above, and an object of the present invention is to obtain a control device and a laser processing device that prevent processing defects from occurring during laser processing using harmonic laser light.
- the present invention provides an initial position of a moving optical system that adjusts the beam diameter of the harmonic laser beam output from the wavelength conversion crystal, and a distance from the initial position.
- a storage unit that stores the defined movement allowable range of the moving optical system, and a machining point output value that is an output value of the harmonic laser beam on the workpiece is equal to or greater than a first set value.
- the position of the moving optical system is moved, and it is determined whether or not the position of the moving optical system after the movement is within the movement allowable range. If the position is outside the movement allowable range, the wavelength conversion crystal And a controller that outputs an instruction to perform the movement to the outside.
- FIG. 1 is a diagram showing a configuration of a laser processing apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart showing a processing procedure of the laser processing apparatus according to the first embodiment.
- FIG. 3 is a diagram for explaining a thermal lens resulting from component deterioration of a laser oscillator.
- FIG. 4 is a flowchart showing a processing procedure of the laser processing apparatus according to the second embodiment.
- FIG. 5 is a diagram for explaining the rising relaxation phenomenon of the harmonic laser beam.
- FIG. 6 is a diagram illustrating a transition example of the output value of the harmonic laser beam.
- FIG. 7 is a view for explaining deterioration determination of the wavelength conversion crystal.
- FIG. 1 is a diagram showing a configuration of a laser processing apparatus according to Embodiment 1 of the present invention.
- FIG. 2 is a flowchart showing a processing procedure of the laser processing apparatus according to the first embodiment.
- FIG. 3 is a diagram for explaining a thermal
- FIG. 8 is a diagram illustrating a transition example of the output value of the harmonic laser beam when the comparison output is smaller than the lower limit output.
- FIG. 9 is a diagram illustrating a transition example of the output value of the harmonic laser beam when the temperature is adjusted regardless of the initial output value.
- FIG. 1 is a diagram showing a configuration of a laser processing apparatus according to Embodiment 1 of the present invention.
- the laser processing apparatus 1 includes a laser oscillator 20, a processing machine optical path system 30, and a control device 10.
- the laser processing apparatus 1 is an apparatus for laser processing the workpiece 2 by irradiating the workpiece 2 with harmonic laser light such as UV (Ultra Violet) laser light.
- the laser processing apparatus 1 of the present embodiment stores the initial position when the position of the moving optical system 31 is moved, and when the harmonic laser output at the processing point changes due to the generation of a thermal lens or the like.
- the position of the moving optical system 31 is moved within a predetermined range. Thereby, the laser processing apparatus 1 keeps the beam diameter at the mask position substantially constant even when a thermal lens or the like is generated.
- the laser processing apparatus 1 determines that the wavelength conversion crystal 42 is significantly deteriorated or damaged, and moves the wavelength conversion crystal 42. Perform temperature adjustment. Specifically, the laser processing apparatus 1 repeats the position movement of the moving optical system 31 and the laser processing. Then, when the laser processing apparatus 1 cannot move the beam diameter at the mask position within a predetermined range unless the moving optical system 31 is moved more than a predetermined amount of displacement from the initial position, the wavelength conversion crystal 42 is moved and the temperature is adjusted.
- the laser oscillator 20 includes a fundamental laser power meter 21, a fundamental wave unit 22, a wavelength conversion unit 23, and a harmonic laser power meter 24.
- the fundamental wave unit 22 has an excitation light source 41 and emits fundamental laser light from the excitation light source 41.
- the fundamental laser beam from the fundamental wave unit 22 is sent to the wavelength conversion unit 23.
- the fundamental laser power meter 21 detects the output value of the fundamental laser beam and sends it to the control device 10.
- the wavelength conversion unit 23 has a wavelength conversion crystal 42 and a crystal moving mechanism 43.
- the wavelength conversion crystal 42 converts the fundamental laser beam into a harmonic laser beam and sends it to the processing machine optical path system 30.
- the wavelength conversion crystal 42 is, for example, an SHG (Second Harmonic Generation) crystal, a THG (Third Harmonic Generation) crystal, an FHG (Forth Harmonic Generation) crystal, or the like.
- the crystal moving mechanism 43 moves the position of the wavelength conversion crystal 42.
- the crystal moving mechanism 43 changes the irradiation position of the fundamental wave laser beam on the wavelength conversion crystal 42 by moving the wavelength conversion crystal 42 in the direction perpendicular to the optical path.
- the crystal moving mechanism 43 moves the wavelength conversion crystal 42 in a direction perpendicular to the optical path when the harmonic laser output exceeding a predetermined value cannot be obtained even if the temperature of the wavelength conversion crystal 42 is adjusted. Further, the crystal moving mechanism 43 repeats the process of moving the moving optical system 31 described later in order to obtain a harmonic laser output greater than or equal to a predetermined value. Then, the crystal moving mechanism 43 moves the wavelength conversion crystal 42 in a direction perpendicular to the optical path when the distance between the moving optical system 31 and the initial position becomes a predetermined value or more.
- the harmonic laser power meter 24 measures the output value of the harmonic laser beam sent from the laser oscillator 20 to the processing machine optical path system 30.
- the harmonic laser power meter 24 sends the measurement result to the control unit 11 described later of the control device 10.
- the processing machine optical path system 30 includes a moving optical system 31, a mask 37, and a processing point output power meter 32, and guides harmonic laser light to the workpiece 2.
- the moving optical system 31 is a lens or the like.
- the moving optical system 31 adjusts the beam system of the harmonic laser light irradiated to the mask 37 by being moved in the optical axis direction.
- the mask 37 is provided with an opening having a predetermined radius, and the workpiece 2 is irradiated with the harmonic laser light that has passed through the opening.
- the machining point output power meter 32 measures the output value of the harmonic laser beam output to the machining point on the workpiece 2.
- the output value of the harmonic laser beam in the laser oscillator 20 is referred to as an output value P3 ⁇
- the output value of the harmonic laser beam output to the processing point on the workpiece 2 is referred to as a processing point output value. .
- the machining point output power meter 32 measures the machining point output value using, for example, harmonic laser light that passes through the mask 37 and is irradiated on the workpiece 2.
- the machining point output power meter 32 sends the measurement result to the control unit 11 described later of the control device 10.
- the control device 10 includes a control unit 11, an excitation light source 12, a temperature adjustment unit 13, a crystal movement mechanism control unit 14, a movement optical system control unit 15, and a storage unit 16.
- the excitation light source 12 sends excitation light to the excitation light source 41.
- the excitation light source 12 is, for example, an LD current.
- the excitation light source 12 adjusts the amount of the fundamental laser beam emitted from the excitation light source 41 by adjusting the LD current and the like.
- the temperature adjustment unit 13 adjusts the temperature of the wavelength conversion crystal 42.
- the temperature adjustment unit 13 is the wavelength conversion crystal.
- the temperature is adjusted so that 42 is lowered to the first temperature T1.
- the first threshold value Pmin and the fifth threshold value Pdmg are reference values for determining the degree of deterioration of the wavelength conversion crystal 42, respectively. Note that Pdmg ⁇ Pmin.
- the output value P3 ⁇ of the harmonic laser beam is lower than the second threshold value (Pmin + Pm), and the output value of the fundamental laser beam is the third threshold value (Px).
- the temperature is adjusted so that the temperature of the wavelength conversion crystal 42 is lowered to the second temperature T2.
- the first threshold value Pmin is a lower limit output allowed when the wavelength conversion crystal 42 is not deteriorated, and Pm is an output margin.
- the temperature adjustment unit 13 adjusts the temperature of the wavelength conversion crystal 42 so as to increase to the third temperature T3 after moving the position of the wavelength conversion crystal 42.
- the first temperature T1 to the third temperature T3 may be any temperature.
- the second temperature T2 is a temperature lower than the first temperature T1 and the third temperature T3.
- the first threshold value Pmin is a value equal to or less than the second threshold value (Pmin + Pm).
- the crystal moving mechanism control unit 14 controls the crystal moving mechanism 43.
- the crystal moving mechanism control unit 14 converts the wavelength into the crystal moving mechanism 43 when the output value P3 ⁇ of the harmonic laser beam is lower than the fourth threshold (Pmin + Pm) even if the temperature of the wavelength converting crystal 42 is lowered to the temperature Tx. The position of the crystal 42 is moved.
- the crystal moving mechanism control unit 14 moves the position of the wavelength conversion crystal 42 to the crystal moving mechanism 43 when the output value P3 ⁇ of the harmonic laser beam is lower than the fifth threshold value (Pdmg).
- the crystal moving mechanism control unit 14 moves the position of the wavelength conversion crystal 42 to the crystal moving mechanism 43 when the output value P3 ⁇ of the harmonic laser beam is lower than the sixth threshold value (Pmin + Pm). Further, the crystal moving mechanism control unit 14 causes the crystal moving mechanism 43 to move the position of the wavelength conversion crystal 42 when the position of the moving optical system 31 is outside the predetermined region.
- the moving optical system control unit 15 controls the position of the moving optical system 31. After adjusting the temperature of the wavelength conversion crystal 42, the moving optical system control unit 15 adjusts the position of the moving optical system 31 if the output value P3 ⁇ of the harmonic laser beam is within the acceptable range.
- the control unit 11 Based on the measurement result from the harmonic laser power meter 24 and the measurement result from the machining point output power meter 32, the control unit 11 includes the excitation light source power source 12, the temperature adjustment unit 13, the crystal moving mechanism control unit 14, the movement The optical system control unit 15 is controlled. The control unit 11 adjusts the output value P3 ⁇ of the harmonic laser beam at the exit of the laser oscillator 20 and the processing point output value at the processing point at an arbitrary timing between processing on the workpiece 2.
- the storage unit 16 stores the measurement result from the harmonic laser power meter 24 and the measurement result from the machining point output power meter 32.
- the storage unit 16 stores first to sixth threshold values.
- the storage unit 16 stores a movement allowable range in which the moving optical system 31 can move from the initial position without damaging the workpiece 2.
- the movement allowable range is defined by the distance from the initial position.
- the area defined by the movement allowable range is also updated.
- the storage unit 16 stores the initial position of the moving optical system 31 when the output value P3 ⁇ of the harmonic laser beam is measured after the position movement of the wavelength conversion crystal 42 and the temperature adjustment are performed. After the position conversion and temperature adjustment of the wavelength conversion crystal 42 are performed, the output value P3 ⁇ of the harmonic laser beam becomes larger than the sixth threshold value (Pmin + Pm), and the processing point output at the processing point becomes the moving optical system 31. It is adjusted by the position adjustment. The position of the moving optical system 31 at this time is the initial position and is stored in the storage unit 16.
- the control unit 11 determines whether the distance from the initial position of the moving optical system 31 is within the movement allowable range. Accordingly, the control unit 11 determines the degree of deterioration of the wavelength conversion crystal 42 that leads to processing defects based on the distance from the initial position of the moving optical system 31.
- the control unit 11 adopts the position of the moving optical system 31 when the moving optical system 31 is within the allowable movement range.
- the control unit 11 causes the crystal movement mechanism control unit 14 to move the position of the wavelength conversion crystal 42 and causes the storage unit 16 to adjust the position of the moving optical system 31 when the movement is outside the allowable movement range.
- FIG. 2 is a flowchart showing a processing procedure of the laser processing apparatus according to the first embodiment.
- control unit 11 causes the harmonic laser power meter 24 to check the output of the harmonic laser beam (step S20).
- the harmonic laser power meter 24 measures the output value P3 ⁇ of the harmonic laser beam and sends the measurement result to the control unit 11.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is greater than or equal to a predetermined value. Specifically, the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is less than the first threshold value Pmin. Then, when the output value P3 ⁇ of the harmonic laser beam is less than the first threshold value Pmin, the control unit 11 determines whether the output value P3 ⁇ of the harmonic laser beam is equal to or less than Pdmg which is the fifth threshold value. Determine whether or not.
- the control unit 11 determines that it is rejected (1). Moreover, the control part 11 determines with disqualification (2), when the output value P3 omega of a harmonic laser beam is below Pdmg which is a 5th threshold value. In other words, if Pdmg ⁇ P3 ⁇ ⁇ Pmin, it is determined as fail (1), and if P3 ⁇ ⁇ Pdmg, it is determined as fail (2). Moreover, the control part 11 determines with a pass, when the output value P3 omega of a harmonic laser beam is more than Pmin which is a 1st threshold value.
- the control unit 11 causes the temperature adjustment unit 13 to perform temperature adjustment of the wavelength conversion crystal 42 (Step S30). Thereby, the temperature adjustment unit 13 performs temperature adjustment so that the wavelength conversion crystal 42 falls to the temperature Tx.
- control unit 11 causes the harmonic laser power meter 24 to check the output of the harmonic laser beam (step S40).
- the harmonic laser power meter 24 measures the output value P3 ⁇ of the harmonic laser beam and sends the measurement result to the control unit 11.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is greater than or equal to a predetermined value. Specifically, the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser light is less than the second threshold value (Pmin + Pm). And the control part 11 determines with a failure, when the output value P3 omega of a harmonic laser beam is less than a 2nd threshold value. Moreover, the control part 11 determines with a pass, when the output value P3 omega of a harmonic laser beam is more than a 2nd threshold value.
- step S50 the control unit 11 performs output check of the fundamental laser beam (step S50).
- the controller 11 determines whether or not the output value P ⁇ of the fundamental wave laser beam is less than the third threshold value Px. And the control part 11 determines with a failure, when the output value Pomega of a fundamental wave laser beam is less than a 3rd threshold value. Moreover, the control part 11 determines with a pass, when the output value Pomega of a fundamental wave laser beam is more than a 3rd threshold value.
- the control unit 11 adjusts the light amount of the fundamental laser beam emitted from the excitation light source 41 by adjusting the LD current and the like (step S60). Furthermore, the control unit 11 causes the temperature adjustment unit 13 to perform temperature adjustment of the wavelength conversion crystal 42 (step S70). Thereby, the temperature adjustment unit 13 performs temperature adjustment so that the wavelength conversion crystal 42 falls to the temperature Tx.
- the temperature adjustment unit 13 performs temperature adjustment so as to decrease to the temperature Tx, the output value P3 ⁇ of the harmonic laser beam is lower than the second threshold value, and the output value of the fundamental laser beam is the third value.
- the temperature is adjusted so that the temperature drops to the temperature Tx after adjusting the LD current when it is lower than the threshold value.
- control unit 11 causes the harmonic laser power meter 24 to check the output of the harmonic laser beam (step S80).
- the harmonic laser power meter 24 measures the output value P3 ⁇ of the harmonic laser beam and sends the measurement result to the control unit 11.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is greater than or equal to a predetermined value. Specifically, the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is less than the fourth threshold value (Pmin + Pm). And the control part 11 determines with disqualification, when the output value P3 omega of a harmonic laser beam is less than a 4th threshold value. Moreover, the control part 11 determines with a pass, when the output value P3 omega of a harmonic laser beam is more than a 4th threshold value.
- control unit 11 determines whether or not the use point number N (N is a natural number) of the wavelength conversion crystal 42 is equal to or less than a specified number (step S90). Note that the value of the number N of used points here is the same value as the number of movements n of the wavelength conversion crystal 42.
- step S90 If P3 ⁇ ⁇ Pdmg in the process of step S20 (step S20, reject (2)), the control unit 11 determines whether or not the number N of use points of the wavelength conversion crystal 42 is equal to or less than a specified number. (Step S90).
- step S50 determines whether or not the use point number N of the wavelength conversion crystal is equal to or less than a specified number (step S90).
- step S90, No the control unit 11 determines that the life of the wavelength conversion crystal 42 is the lifetime, and performs output adjustment processing of the harmonic laser beam. finish. In other words, when the use point number N of the wavelength conversion crystal 42 exceeds the specified number, the output adjustment process of the harmonic laser beam is terminated.
- the control unit 11 causes the crystal movement mechanism control unit 14 to control the crystal movement mechanism 43.
- the crystal moving mechanism control unit 14 causes the crystal moving mechanism 43 to move the position of the wavelength conversion crystal 42 (step S100).
- control unit 11 causes the harmonic laser power meter 24 to check the output of the harmonic laser beam (step S130).
- the harmonic laser power meter 24 measures the output value P3 ⁇ of the harmonic laser beam and sends the measurement result to the control unit 11.
- the initial value update flag F is set to “1” when the wavelength conversion crystal 42 is moved. Then, the control unit 11 causes the machining point output power meter 32 to measure the machining point output value (step S160).
- step S20 determines whether Pmin ⁇ P3 ⁇ in the process of step S20 (step S20, pass). If Pmin ⁇ P3 ⁇ in the process of step S20 (step S20, pass), the control unit 11 causes the machining point output power meter 32 to measure the machining point output value (step S160).
- step S40 the control unit 11 causes the machining point output power meter 32 to measure the machining point output value (step S160).
- step S80 when P3 ⁇ ⁇ (Pmin + Pm) is satisfied in the process of step S80 (step S80, pass), the control unit 11 causes the machining point output power meter 32 to measure the machining point output value (step S160).
- control unit 11 moves the position of the moving optical system 31 to the moving optical system control unit 15 based on the measurement result of the processing point output value.
- the moving optical system control unit 15 adjusts the position of the moving optical system 31 according to the instruction from the control unit 11 so that the machining point output value becomes equal to or larger than the first set value (step S170).
- control unit 11 does not update the initial position of the moving optical system 31. And the control part 11 confirms whether the present position of the movement optical system 31 is in a regulation range (step S200).
- control unit 11 determines that the laser oscillator 20 is normal and ends the harmonic laser beam output adjustment processing.
- control unit 11 determines whether or not the use point number N of the wavelength conversion crystal 42 is equal to or less than the specified number (Step S200). S210).
- control unit 11 determines that P3 ⁇ ⁇ (Pmin + Pm) in the process of step S130 (step S130, reject), whether or not the number N of used points of the wavelength conversion crystal 42 is equal to or less than the specified number. Is determined (step S210).
- control unit 11 determines that the life of the wavelength conversion crystal 42 is the lifetime, and performs the output adjustment processing of the harmonic laser beam. finish.
- step S210 when the use point number N of the wavelength conversion crystal 42 is N ⁇ the specified number of times (Yes in step S210), the control unit 11 determines whether or not the number of movements n of the moving optical system 31 is equal to or less than the specified number. Determination is made (step S220).
- step S220, No the control unit 11 determines that the laser oscillator 20 is abnormal and ends the harmonic laser beam output adjustment processing. .
- Step S220 when the moving number n of the moving optical system 31 is n ⁇ the specified number (step S220, Yes), the control unit 11 performs the processing of steps S100 to S130. And control part 11 performs processing of Step S210, when output value P3 omega of a harmonic laser beam is less than the 6th threshold (Step S130, rejection). In addition, when the output value P3 ⁇ of the harmonic laser beam is equal to or greater than the sixth threshold (Step S130, pass), the control unit 11 performs the processes of Steps S140 to S200.
- the control unit 11 determines that the current position of the moving optical system 31 is within the specified range in the process of step S200, or the use point number N of the wavelength conversion crystal 42 is N> the specified number in the process of step S210.
- the processing of steps S100 to S220 is repeated until it is determined or until it is determined in the processing of step S220 that the number of movements n of the moving optical system 31 is n> the specified number.
- the second threshold value, the fourth threshold value, and the sixth threshold value are the same has been described, but these values may be different.
- FIG. 3 is a diagram for explaining a thermal lens resulting from component deterioration of a laser oscillator.
- 3A shows the beam propagation state before adjusting the position of the moving optical system 31
- FIG. 3B shows the beam propagation state after adjusting the position of the moving optical system 31.
- Yes. 3A and 3B the optical path from the wavelength conversion crystal 42 to the mask 37 is shown.
- the moving optical system 31 before position adjustment is illustrated as a moving optical system lens 31A
- the moving optical system 31 after position adjustment is illustrated as a moving optical system lens 31B.
- 3 shows the case where the moving optical system lenses 31A and 31B are collimating lenses, the moving optical system lenses 31A and 31B may be ⁇ / 2 plates or the like.
- the wavelength converting crystal 42 42 temperature adjustment is performed.
- the beam passing point temperature of the wavelength conversion crystal 42 increases due to deterioration or damage, and the temperature of the wavelength conversion crystal 42 is lowered in order to cool the amount shifted from the optimum value. Therefore, the temperature gradient between the side surface of the wavelength conversion crystal 42 and the beam passing point is increased, and as a result, a thermal lens is generated.
- the harmonic laser beam 51 when no thermal lens is generated due to deterioration of the wavelength conversion crystal 42 or the like is applied to the mask 37 so that a desired processing point output value can be obtained. More specifically, the mask 37 is irradiated with a harmonic laser beam 51 having a beam diameter capable of obtaining a desired processing point output value. At this time, the harmonic laser beam 51 output from the wavelength conversion crystal 42 is applied to the mask 37 via the collimating lens 35 and the moving optical system 31.
- the thermal lens Since the wavelength conversion crystal 42 has a negative refractive index temperature characteristic, the thermal lens appears as a concave lens.
- the harmonic laser beam 52 in the case where the thermal lens is generated due to deterioration of the wavelength conversion crystal 42 or the like is irradiated to the mask 37 with a beam diameter larger than a desired beam diameter.
- the utilization rates of the harmonic laser beams 51 and 52 in the mask 37 differ depending on whether or not a thermal lens is generated. For this reason, the processing point output value taken out after passing through the mask 37 varies depending on whether or not a thermal lens is generated.
- the output value P3 ⁇ of the harmonic laser beam is the same at the exit of the laser oscillator 20, the propagation of the laser beam changes and the machining point output value changes.
- the position of the moving optical system 31 is adjusted so that the beam diameter at the mask 37 is the same before and after the generation of the thermal lens.
- the control unit 11 adjusts the position of the moving optical system 31, thereby making the beam diameter at the mask 37 the same.
- the wavefront of the harmonic laser beam in the mask 37 changes before and after the deterioration of the wavelength conversion crystal 42, it has been found that the processing state of the workpiece 2 changes. In other words, it has been found that the divergence angle, which is a harmonic laser wavefront, changes due to the deterioration of the wavelength conversion crystal 42.
- the position of the moving optical system 31 is stored in the storage unit 16 as the initial position. deep.
- the position of the moving optical system 31 is, for example, the position of the collimating lens when the processing point output value is adjusted with the moving collimating lens and the mask 37.
- the processing point output value is adjusted by adjusting the position of the collimating lens in the optical path direction.
- the processing point output value is adjusted by the ⁇ / 2 plate and the polarizer
- the processing point output value of the position of the moving optical system 31 is adjusted by adjusting the rotational position of the ⁇ / 2 plate.
- FIG. 3B shows a state in which the harmonic laser beam 52 is changed to the harmonic laser beam 53 by adjusting the position of the moving optical system lens 31 ⁇ / b> A to the position of the moving optical system lens 31 ⁇ / b> B.
- the harmonic laser beam 53 is a laser beam irradiated on the mask 37 with the same beam diameter as the harmonic laser beam 51.
- the harmonic laser beams 51 and 53 are laser beams that do not damage the workpiece 2 during laser processing.
- the beam diameter on the mask 37 is adjusted to be the same as that before the generation of the thermal lens by adjusting the position of the moving optical system lens 31A. Due to the deterioration of the wavelength conversion crystal 42, the wavefront of the harmonic laser beam 53 becomes sharper than the harmonic laser beam 51. In the present embodiment, since the position of the moving optical system 31 is adjusted within a predetermined range, the harmonic laser beam on the mask 37 has the same wavefront before and after the generation of the thermal lens.
- the storage unit 16 stores the movement allowable range from the initial position where the workpiece 2 is not damaged during laser processing. Then, the control unit 11 determines that the wavelength conversion crystal 42 is significantly deteriorated when the moving optical system 31 moved to adjust the processing point output value exceeds the allowable movement range from the initial position. The conversion crystal 42 is moved perpendicularly to the harmonic laser beam 52, thereby changing the beam passing point. Further, the control unit 11 performs temperature adjustment after the wavelength conversion crystal 42 is moved, newly adjusts the position of the moving optical system 31, and newly stores it as the initial position.
- the utilization factor of the laser light at the processing point falls within the predetermined range. Therefore, when laser processing using harmonic laser light is performed. It is possible to prevent processing defects from occurring.
- the initial position of the moving optical system 31 is stored, and the wavelength conversion crystal 42 is moved when the moving optical system 31 exceeds the allowable movement range. It is possible to prevent processing defects from occurring during laser processing using light.
- the wavelength conversion crystal 42 is moved when the output value P3 ⁇ of the harmonic laser beam sent from the laser oscillator 20 to the processing machine optical path system 30 is lower than a predetermined ratio from the initial output value.
- the wavelength conversion crystal 42 is moved when the amount of change in the output value P3 ⁇ of the harmonic laser beam has decreased by a predetermined percentage or more from the initial output value.
- the output value P3 ⁇ of the harmonic laser beam is lower than the seventh threshold value (Pmin or Pc (x)) and is higher than the tenth threshold value (Pdmg).
- the temperature adjustment is performed so that the wavelength conversion crystal 42 is lowered to the fourth temperature T4.
- Pc (x) is a comparative output used for determining the deterioration of the wavelength conversion crystal 42, and is a value defined using the rate of decrease from the initial output.
- the output value P3 ⁇ of the harmonic laser beam is lower than the eighth threshold (Pmin or Pc (x)) and the output value of the fundamental laser beam is the first value.
- the threshold value (Px) is lower than 3
- the temperature adjustment is performed so that the temperature of the wavelength conversion crystal 42 is lowered to the fifth temperature T5.
- the temperature adjustment unit 13 adjusts the temperature so that the temperature of the wavelength conversion crystal 42 is lowered to the sixth temperature T6 after the position of the wavelength conversion crystal 42 is moved.
- the fourth temperature T4 to the sixth temperature T6 may be any temperature.
- the fifth temperature T5 is a temperature lower than the fourth temperature T4 and the sixth temperature T6.
- the case where the fourth temperature T4 to the sixth temperature T6 are all the same temperature Tx will be described.
- the crystal moving mechanism control unit 14 controls the crystal moving mechanism 43.
- the crystal moving mechanism control unit 14 is configured to operate the crystal moving mechanism 43 when the output value P3 ⁇ of the harmonic laser beam is lower than the ninth threshold value (Pjdg (x)) even if the temperature of the wavelength conversion crystal 42 is lowered to the temperature Tx.
- the position of the wavelength conversion crystal 42 is moved.
- the crystal moving mechanism control unit 14 causes the crystal moving mechanism 43 to move the position of the wavelength conversion crystal 42 when the output value P3 ⁇ of the harmonic laser beam is lower than the tenth threshold (Pmin + Pm).
- the crystal moving mechanism control unit 14 moves the position of the wavelength conversion crystal 42 to the crystal moving mechanism 43 when the output value P3 ⁇ of the harmonic laser beam is lower than the eleventh threshold value (Pdmg).
- the storage unit 16 stores the seventh to eleventh threshold values.
- the storage unit 16 also stores an initial output value (P0) of the output value P3 ⁇ of the harmonic laser beam when the position of the wavelength conversion crystal 42 is moved.
- the storage unit 16 also stores a comparison output used for determining the deterioration of the wavelength conversion crystal 42.
- the control unit 11 determines whether the output value P3 ⁇ of the harmonic laser beam is within a predetermined range of change from the initial output value. Specifically, the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is within the output value allowable range defined by the decrease rate of the initial output value. Accordingly, the control unit 11 determines the degree of deterioration of the wavelength conversion crystal 42 that leads to processing defects based on the amount of variation from the initial output value.
- FIG. 4 is a flowchart showing a processing procedure of the laser processing apparatus according to the second embodiment. Of the processes in FIG. 4, the description of the same processes as those in the first embodiment shown in FIG. 2 is omitted.
- the control unit 11 When the wavelength conversion crystal 42 is arranged in the laser processing apparatus 1, the control unit 11 resets the number of movements of the wavelength conversion crystal 42 (step S10). And the control part 11 makes the harmonic laser power meter 24 perform the output check of a harmonic laser beam (step S21). Thereby, the harmonic laser power meter 24 measures the output value P3 ⁇ of the harmonic laser beam.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is greater than or equal to a predetermined value.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is less than the seventh threshold value.
- the seventh threshold is, for example, Pc (x) when Pc (x)> Pmin, and Pmin when Pc (x) ⁇ Pmin.
- the comparison output Pc (x) is defined by ⁇ x, which is the rate of decrease from the initial output P0.
- Pc (x) when the wavelength conversion crystal 42 is moved for the first time is Pc (1)
- Pc (x) when the wavelength conversion crystal 42 is moved for the Mth M is a natural number
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is equal to or greater than Pc (x), and the seventh threshold value is Pmin. In some cases, it is determined whether or not P3 ⁇ that is the output value of the harmonic laser beam is equal to or greater than Pmin. The controller 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is equal to or less than the 11th threshold value Pdmg when P3 ⁇ is equal to or greater than Pc (x) or equal to or greater than Pmin. .
- the control unit 11 determines that the output is not acceptable (3). . Moreover, the control part 11 determines with disqualification (4), when the output value P3 omega of a harmonic laser beam is below 11th threshold value Pdmg. In other words, if Pdmg ⁇ P3 ⁇ ⁇ Pc (x) or Pdmg ⁇ P3 ⁇ ⁇ Pmin, it is determined as fail (3), and if P3 ⁇ ⁇ Pdmg, it is determined as fail (4). Moreover, the control part 11 determines with a pass, when the output value P3 omega of a harmonic laser beam is more than 7th threshold value Pmin or Pc (x). In the following description, a case where Pc (x)> Pmin is described.
- control unit 11 causes the temperature adjustment unit 13 to perform temperature adjustment of the wavelength conversion crystal 42 (step S30).
- control unit 11 causes the harmonic laser power meter 24 to check the output of the harmonic laser beam (step S41). Thereby, the harmonic laser power meter 24 measures the output value P3 ⁇ of the harmonic laser beam.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is greater than or equal to a predetermined value.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is less than the eighth threshold value Pc (x). And the control part 11 determines with a failure, when the output value P3 omega of a harmonic laser beam is less than an 8th threshold value. Moreover, the control part 11 determines with a pass, when the output value P3 omega of a harmonic laser beam is more than an 8th threshold value.
- the control unit 11 When P3 ⁇ ⁇ Pc (x) is satisfied (step S41, failure), the control unit 11 performs an output check of the fundamental laser beam (step S50). The controller 11 determines whether or not the output value P ⁇ of the fundamental wave laser beam is less than the third threshold value Px. And the control part 11 determines with a failure, when the output value Pomega of a fundamental wave laser beam is less than a 3rd threshold value. Moreover, the control part 11 determines with a pass, when the output value Pomega of a fundamental wave laser beam is more than a 3rd threshold value.
- the control unit 11 adjusts the light amount of the fundamental laser beam emitted from the excitation light source 41 by adjusting the LD current and the like (step S60). Furthermore, the control unit 11 causes the temperature adjustment unit 13 to perform temperature adjustment of the wavelength conversion crystal 42 (step S70). Thereby, the temperature adjustment unit 13 performs temperature adjustment so that the wavelength conversion crystal 42 falls to the temperature Tx.
- control unit 11 causes the harmonic laser power meter 24 to check the output of the harmonic laser beam (step S81). Thereby, the harmonic laser power meter 24 measures the output value P3 ⁇ of the harmonic laser beam.
- the control unit 11 determines whether or not the output value P3 ⁇ of the harmonic laser beam is greater than or equal to a predetermined value.
- the control unit 11 of this embodiment determines whether or not the output value P3 ⁇ of the harmonic laser beam is less than the output determination value Pjdg (x) that is the ninth threshold value.
- the output determination value Pjdg (x) is obtained by adding Pm, which is an output margin, to Pc (x), which is the eighth threshold value, and is used as a criterion for determining whether or not to move the wavelength conversion crystal 42.
- the output determination value Pjdg (x) is an output lower limit value that is allowed as the output value P3 ⁇ of the harmonic laser beam. When the output value P3 ⁇ of the harmonic laser beam is smaller than this value, the wavelength conversion is performed. The movement of the crystal 42 is performed.
- the control unit 11 determines that the output is not acceptable when the output value P3 ⁇ of the harmonic laser beam is less than the ninth threshold value. Moreover, the control part 11 determines with a pass, when the output value P3 omega of a harmonic laser beam is more than a 9th threshold value.
- step S90 determines whether or not the number N of use points of the wavelength conversion crystal 42 is equal to or less than a specified number. If P3 ⁇ ⁇ Pdmg in the process of step S21 (step S21, reject (4)), the control unit 11 determines whether or not the number N of used points of the wavelength conversion crystal 42 is equal to or less than a specified number. (Step S90).
- step S50 determines whether or not the use point number N of the wavelength conversion crystal is equal to or less than a specified number (step S90).
- control unit 11 determines that the life of the wavelength conversion crystal 42 is the lifetime, and performs output adjustment processing of the harmonic laser beam. finish.
- control unit 11 When the use point number N of the wavelength conversion crystal 42 is N ⁇ the specified number (step S90, Yes), the control unit 11 performs the same process as steps S100 to S130 of the first embodiment. That is, the control unit 11 moves the position of the wavelength conversion crystal 42 (step S100) and increments the number of crystal movements by one (step S110). Further, the control unit 11 causes the temperature adjustment unit 13 to adjust the temperature of the wavelength conversion crystal 42 (step S120), and then causes the harmonic laser power meter 24 to check the output of the harmonic laser light (step S130). ).
- control unit 11 updates the initial output value of the laser oscillator 20 at the crystal position Np corresponding to the use point number N (step S150). Thereby, the initial output value of the harmonic laser beam after moving the wavelength conversion crystal 42 is updated.
- the initial output value is stored in the storage unit 16.
- control unit 11 causes the machining point output power meter 32 to measure the machining point output value (step S160). If Pc (x) ⁇ P3 ⁇ in the process of step S21 (step S21, pass), the control unit 11 causes the machining point output power meter 32 to measure the machining point output value (step S160).
- step S41 the control unit 11 causes the machining point output power meter 32 to measure the machining point output value (step S160).
- step S81 if Pjdg (x) ⁇ P3 ⁇ in the processing of step S81 (step S81, pass), the control unit 11 causes the processing point output power meter 32 to measure the processing point output value (step S160).
- step S160 the control unit 11 moves the position of the moving optical system 31 to the moving optical system control unit 15 based on the measurement result of the processing point output value.
- the moving optical system control unit 15 adjusts the position of the moving optical system 31 according to the instruction from the control unit 11 so that the machining point output value is within a predetermined range (step S170).
- the control part 11 judges that the laser oscillator 20 is normal, and complete
- step S130 reject
- the control unit 11 determines that P3 ⁇ ⁇ (Pmin + Pm) in the process of step S130 (step S130, reject) in the process of step S130 (step S130, reject)
- control unit 11 determines that the life of the wavelength conversion crystal 42 is the lifetime, and performs the output adjustment processing of the harmonic laser beam. finish.
- step S210 when the use point number N of the wavelength conversion crystal 42 is N ⁇ the specified number of times (Yes in step S210), the control unit 11 determines whether or not the number of movements n of the moving optical system 31 is equal to or less than the specified number. Determination is made (step S220).
- step S220, No the control unit 11 determines that the laser oscillator 20 is abnormal and ends the harmonic laser beam output adjustment processing. .
- step S220 when the moving number n of the moving optical system 31 is n ⁇ the specified number (step S220, Yes), the control unit 11 performs the processing of steps S100 to S130.
- the control unit 11 determines that the number N of use points of the wavelength conversion crystal 42 is N ⁇ specified number in the process of step S210, or the number of movements n of the moving optical system 31 is n> specified number in the process of step S220. The processes in steps S100 to S130, S210, and S220 are repeated until it is determined that there is.
- FIG. 5 is a diagram for explaining the rising relaxation phenomenon of the harmonic laser beam.
- the horizontal axis in FIG. 5 is time, and the vertical axis is the normalized output of the harmonic laser beam.
- the characteristic 61 shows the characteristic when the wavelength conversion crystal 42 is small or small.
- the characteristic 62 shows the characteristics when the wavelength conversion crystal 42 is heavily contaminated or large.
- the wavelength conversion crystal 42 dust burn-in and deterioration occur with the passage of laser light such as fundamental wave laser light and harmonic laser light. Thereby, the wavelength conversion crystal 42 easily absorbs the harmonic laser, and the temperature of the beam passing point of the wavelength conversion crystal 42 temporarily rises when the laser beam passes. Thereafter, the temperature is thermally diffused, and the temperature distribution in the wavelength conversion crystal 42 becomes uniform.
- the wavelength conversion efficiency in the wavelength conversion crystal 42 changes. For this reason, the pulse output of the harmonic laser beam changes with time at the rise time when the output of the harmonic laser beam is started, and as a result, it takes a long time to stabilize at the desired output. In the present embodiment, this phenomenon is called a relaxation phenomenon.
- the pulse output of the harmonic laser beam rises to a desired output in a short time as indicated by the characteristic 61.
- the wavelength conversion crystal 42 is very dirty or large, as shown by the characteristic 62, it takes a long time for the pulse output of the harmonic laser light to rise to a desired output.
- the temperature change at the beam passing point in the wavelength conversion crystal 42 can always occur due to the presence / absence of laser beam passage, damage to the beam passing point of the wavelength conversion crystal 42, and the degree of deterioration.
- the control unit 11 outputs the harmonic laser beam when the laser beam is passed for the first time at the beam passing point on the wavelength conversion crystal 42.
- An initial output value that is a value is stored. For example, after the position of the wavelength conversion crystal 42 is moved, the control unit 11 stores the initial output value of the harmonic laser light when the laser light is first passed.
- the control unit 11 determines that the wavelength conversion crystal 42 is significantly deteriorated. Then, the controller 11 changes the beam passing point by moving the wavelength conversion crystal 42 in the direction perpendicular to the laser light. After movement of the wavelength conversion crystal 42, temperature adjustment is performed and a new initial output value is stored. With this flow, the pulse fluctuation width of the harmonic laser beam can be kept within a specified range, so that processing defects due to the relaxation phenomenon can be prevented.
- control unit 11 may change Pc (x), which is the threshold value of the reduction ratio of the initial output value, for each beam passing point of the wavelength conversion crystal 42.
- Pc (x) the threshold value of the reduction ratio of the initial output value
- the control unit 11 may change Pc (x) according to the magnitude of the output value of the fundamental laser beam when the initial output value is stored.
- the control unit 11 may change the output determination value Pjdg (x) for each beam passing point of the wavelength conversion crystal 42.
- FIG. 6 is a diagram showing a transition example of the output value of the harmonic laser beam.
- FIG. 6 shows the transition of the output value of the harmonic laser beam when the temperature adjustment and movement of the wavelength conversion crystal 42 are executed according to the processing of the present embodiment.
- the initial output value at the beam passage point (1) is indicated by an initial output value P0 (1)
- the initial output value at the beam passage point (2) is indicated by an initial output value P0 (2)
- the output determination value Pjdg (1) is an output determination value at the beam passage point (1)
- the output determination value Pjdg (2) is an output determination value at the beam passage point (2)
- Pc (1) is a comparison output at the beam passage point (1)
- Pc (2) is a comparison output at the beam passage point (2).
- the control unit 11 adjusts the temperature of the wavelength conversion crystal 42. As a result, the output value P3 ⁇ of the harmonic laser beam increases. In the laser processing apparatus 1, the phenomenon in which the output value P3 ⁇ of the harmonic laser beam decreases and the process of increasing the output value P3 ⁇ of the harmonic laser beam by temperature adjustment are repeated.
- the movement process of the wavelength conversion crystal 42 is executed. Thereby, the passing position of the laser light in the wavelength conversion crystal 42 is changed from the beam passing point (1) to the beam passing point (2).
- the same processing as that for the beam passing point (1) is executed for the beam passing point (2).
- the output value P3 ⁇ of the harmonic laser beam decreases.
- the control unit 11 adjusts the temperature of the wavelength conversion crystal 42.
- the output value P3 ⁇ of the harmonic laser beam increases.
- the phenomenon that the output value P3 ⁇ of the harmonic laser beam decreases, the process of increasing the output value P3 ⁇ of the harmonic laser beam by temperature adjustment, and the process of moving the wavelength conversion crystal 42 are repeated.
- FIG. 7 is a view for explaining deterioration determination of the wavelength conversion crystal. If the harmonic laser beam having the initial output value P0 (1) is continuously used, the output value P3 ⁇ of the harmonic laser beam decreases. When the output value P3 ⁇ of the harmonic laser beam becomes smaller than Pjdg (1) that is a comparative output value at the beam passing point (1), the output value P3 ⁇ of the harmonic laser beam becomes 0 at any timing thereafter. . For this reason, when the output value P3 ⁇ of the harmonic laser beam becomes smaller than Pjdg (1), the control unit 11 determines that the deterioration of the wavelength conversion crystal 42 has progressed beyond a predetermined value and moves the wavelength conversion crystal 42. To do.
- FIG. 8 is a diagram illustrating a transition example of the output value of the harmonic laser beam when the comparison output is smaller than the lower limit output.
- the initial output value at the beam passage point (M) is indicated by an initial output value P0 (M)
- the initial output value at the beam passage point (M + 1) is indicated by an initial output value P0 (M + 1).
- the output determination value Pjdg (M) is an output determination value at the beam passing point (M).
- Pmin is larger than Pc (M).
- the output value P3 ⁇ of the harmonic laser beam decreases.
- the control unit 11 performs temperature adjustment of the wavelength conversion crystal 42.
- the output value P3 ⁇ of the harmonic laser beam increases.
- the phenomenon in which the output value P3 ⁇ of the harmonic laser beam decreases and the process of increasing the output value P3 ⁇ of the harmonic laser beam by temperature adjustment are repeated.
- the movement process of the wavelength conversion crystal 42 is performed. Thereby, the passing position of the laser light in the wavelength conversion crystal 42 is changed from the beam passing point (M) to the beam passing point (M + 1). Then, the same processing as that for the beam passing point (M) is executed for the beam passing point (M + 1).
- FIG. 9 is a diagram showing a transition example of the output value of the harmonic laser beam when the temperature is adjusted regardless of the initial output value.
- FIG. 9 shows the transition of the output value of the harmonic laser light when the temperature adjustment and movement of the wavelength conversion crystal 42 are executed without taking measures against the rising relaxation phenomenon of the harmonic laser light.
- the initial output value at the beam passage point (Z1) is indicated by an initial output value P0 (Z1)
- the initial output value at the beam passage point (Z2) is indicated by an initial output value P0 (Z2).
- the output determination value Pjdg (Zx) is an output determination value common to all beam passing points.
- Pmin is a lower limit output common to all beam passing points.
- Pdmg is a reference value for determining whether or not the wavelength conversion crystal 42 is deteriorated, and is a value common to all beam passing points.
- the output value P3 ⁇ of the harmonic laser beam decreases.
- the control unit 11 performs temperature adjustment of the wavelength conversion crystal 42. As a result, the output value P3 ⁇ of the harmonic laser beam increases.
- the laser processing apparatus 1 may execute a process in which the process described in the first embodiment and the process described in the second embodiment are combined. In this case, for example, the laser processing apparatus 1 executes both the thermal lens countermeasure process described in the first embodiment and the rise mitigation phenomenon countermeasure process described in the second embodiment. Specifically, the laser processing apparatus 1 performs the processes in steps S21, S41, and S81 described in FIG. 4 instead of the processes in steps S20, S40, and S80 described in FIG. Perform the process described.
- the initial output value of the harmonic laser light output value P3 ⁇ is stored, and the output value P3 ⁇ of the harmonic laser light is decreased from the initial output value by a predetermined rate or more. Since the wavelength conversion crystal 42 is moved, it is possible to prevent processing defects from occurring during laser processing using harmonic laser light.
- control device and laser processing device according to the present invention are suitable for controlling the output value of laser light.
- SYMBOLS 1 Laser processing apparatus 2 Workpiece, 10 Control apparatus, 11 Control part, 13 Temperature adjustment unit, 14 Crystal movement mechanism control unit, 15 Movement optical system control unit, 16 Storage part, 20 Laser oscillator, 23 Wavelength conversion unit, 24 harmonic laser power meter, 30 processing machine optical path system, 31 moving optical system, 31A, 31B moving optical system lens, 32 processing point output power meter, 37 mask, 42 wavelength conversion crystal, 43 crystal moving mechanism, 51-53 Harmonic laser light.
Abstract
Description
図1は、本発明の実施の形態1に係るレーザ加工装置の構成を示す図である。レーザ加工装置1は、レーザ発振器20、加工機光路系30、制御装置10を備えている。レーザ加工装置1は、UV(Ultra Violet)レーザ光などの高調波レーザ光を被加工物2に照射することによって被加工物2をレーザ加工する装置である。
つぎに、図4~図9を用いてこの発明の実施の形態2について説明する。実施の形態2では、レーザ発振器20から加工機光路系30に送られる高調波レーザ光の出力値P3ωが、初期出力値から所定の割合よりも低下した場合に波長変換結晶42を移動させる。換言すると、高調波レーザ光の出力値P3ωの変化量が、初期出力値から所定の割合以上低下した場合に、波長変換結晶42が移動させられる。
Claims (9)
- 波長変換結晶から出力された高調波レーザ光のビーム径を調整する移動光学系の初期位置と、前記初期位置からの距離で定義された前記移動光学系の移動許容範囲と、を記憶する記憶部と、
前記高調波レーザ光の被加工物上での出力値である加工点出力値が第1の設定値以上となるよう前記移動光学系の位置を移動させるとともに、移動後の前記移動光学系の位置が前記移動許容範囲内であるか否かを判定し、前記移動許容範囲外である場合には、前記波長変換結晶の移動を行わせる指示を外部出力する制御部と、
を備えることを特徴とする制御装置。 - 前記制御部は、前記波長変換結晶の移動を行わせた後、前記加工点出力値が前記第1の設定値以上となるよう前記移動光学系の位置を再び移動させ、移動後の前記移動光学系の初期位置を前記記憶部に更新させ、更新後の初期位置に基づいて、前記移動光学系の位置が前記移動許容範囲内であるか否かを判定することを特徴とする請求項1に記載の制御装置。
- 前記移動光学系は、コリメートレンズであり、
前記移動許容範囲は、前記コリメートレンズの光路方向の位置に関する範囲であることを特徴とする請求項1または2に記載の制御装置。 - 前記移動光学系は、λ/2板であり、
前記移動許容範囲は、前記λ/2板の回転位置に関する範囲であることを特徴とする請求項1または2に記載の制御装置。 - 波長変換結晶の温度調整が行なわれた後に前記波長変換結晶から出力される高調波レーザ光の初期出力値と、前記初期出力値の低下割合で定義された比較出力値と、を記憶する記憶部と、
前記高調波レーザ光の出力値が前記比較出力値以下になると前記波長変換結晶の温度調整を行わせるとともに、温度調整後の前記高調波レーザ光の出力値が前記比較出力値よりも大きな値である出力判定値以上であるか否かを判定し、前記出力判定値未満である場合には、前記波長変換結晶の移動を行わせる指示を外部出力する制御部と、
を備えることを特徴とする制御装置。 - 前記比較出力値は、前記高調波レーザ光が前記波長変換結晶を通過する位置であるビーム通過点毎に予め設定された値であることを特徴とする請求項5に記載の制御装置。
- 前記出力判定値は、前記高調波レーザ光が前記波長変換結晶を通過する位置であるビーム通過点毎に予め設定された値であることを特徴とする請求項5に記載の制御装置。
- 波長変換結晶を用いて高調波レーザ光を出力するレーザ発振器と、
移動光学系を用いて前記高調波レーザ光を被加工物上へ導く加工機光路系と、
前記レーザ発振器および前記加工機光路系を制御する制御装置と、
を有し、
前記制御装置は、
波長変換結晶から出力された高調波レーザ光のビーム径を調整する移動光学系の初期位置と、前記初期位置からの距離で定義された前記移動光学系の移動許容範囲と、を記憶する記憶部と、
前記高調波レーザ光の被加工物上での出力値である加工点出力値が第1の設定値以上となるよう前記移動光学系の位置を移動させるとともに、移動後の前記移動光学系の位置が前記移動許容範囲内であるか否かを判定し、前記移動許容範囲外である場合には、前記波長変換結晶の移動を行わせる指示を外部出力する制御部と、
を備えることを特徴とするレーザ加工装置。 - 波長変換結晶を用いて高調波レーザ光を出力するレーザ発振器と、
移動光学系を用いて前記高調波レーザ光を被加工物上へ導く加工機光路系と、
前記レーザ発振器および前記加工機光路系を制御する制御装置と、
を有し、
前記制御装置は、
波長変換結晶の温度調整が行なわれた後に前記波長変換結晶から出力される高調波レーザ光の初期出力値と、前記初期出力値の低下割合で定義された比較出力値と、を記憶する記憶部と、
前記高調波レーザ光の出力値が前記比較出力値以下になると前記波長変換結晶の温度調整を行わせるとともに、温度調整後の前記高調波レーザ光の出力値が前記比較出力値よりも大きな値である出力判定値以上であるか否かを判定し、前記出力判定値未満である場合には、前記波長変換結晶の移動を行わせる指示を外部出力する制御部と、
を備えることを特徴とするレーザ加工装置。
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JPWO2015159687A1 (ja) | 2017-04-13 |
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KR20160083955A (ko) | 2016-07-12 |
KR101718677B1 (ko) | 2017-03-21 |
CN105940345B (zh) | 2018-05-29 |
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