JP6485293B2 - Laser welding machine - Google Patents

Description

  The present invention relates to a laser welding machine including a laser beam emitting mechanism that deflects and emits input laser beam toward a workpiece.

  Conventionally, laser welding using a laser welding machine has been performed in the automobile industry and the like. For example, Patent Document 1 discloses a laser including a laser oscillator that emits laser light, an optical fiber that transmits the laser light, and a laser welding processing head (laser light emission mechanism) that irradiates the workpiece with laser light and welds it. A welding machine is disclosed (see FIG. 2 of Patent Document 1 and claims). Further, in this laser welding machine, a plurality of optical sensors are arranged in the laser oscillator, and the plasma light emitted from the laser light irradiation portion of the workpiece surface is passed through the laser welding processing head and the optical fiber. It is configured to lead to an optical sensor in the laser oscillator. And it describes that the beam focus is set by moving the laser welding processing head relative to the workpiece based on the emission intensity of the plasma light detected by the optical sensor.

JP 2005-34885 A

  By the way, when laser welding is performed continuously, particularly when laser welding is performed continuously at a high output and a small spot diameter, the optical system in the laser welding processing head (laser light emitting mechanism) It has been found that the focus position gradually shifts as the temperature rises. In order to solve this problem, prior to actual welding, it is conceivable to irradiate laser light continuously until the temperature of the optical system in the laser welding processing head (laser light emitting mechanism) is stabilized. Such so-called warm-up operation results in high costs.

  On the other hand, as described above, the laser welding machine disclosed in Patent Document 1 transmits the plasma light emitted from the laser irradiation site on the workpiece surface to the optical sensor in the laser oscillator through the laser welding processing head and the optical fiber. Then, focusing is performed based on the emission intensity detected by the light sensor. For this reason, even when the temperature of the optical system rises due to continuous welding and a focus shift occurs, it is considered that the focus shift can be eliminated by performing focusing before each welding.

  However, the laser welding machine disclosed in Patent Document 1 does not generate plasma light unless the workpiece is actually irradiated with laser light. Therefore, focusing cannot be performed unless laser light is irradiated. For this reason, prior to laser welding using an actual workpiece, a dummy workpiece is prepared, and this is irradiated with laser light to perform focusing. Therefore, even when the laser welding machine of Patent Document 1 is used, the cost is increased.

  The present invention has been made in view of such a current situation, and an object of the present invention is to provide a laser welding machine that can eliminate or reduce a focus shift associated with laser irradiation without preparing a dummy workpiece.

One aspect of the present invention for solving the above-described problem is a laser welding machine including a laser beam emitting mechanism that deflects and emits laser light toward a workpiece, and includes an illumination tool that irradiates the workpiece with inspection light. The laser light emitting mechanism is provided outside the laser light emitting mechanism, and the laser light emitting mechanism includes: a collimating lens that converts the laser light into parallel light; at least one galvano scanner that deflects the laser light that has passed through the collimating lens; A condensing lens that condenses and collects laser light, and is disposed between the collimating lens, the galvano scanner, and the condensing lens. The laser light that has passed through the collimating lens is transmitted while the illumination is performed. A half mirror that reflects the reflected inspection light that is reflected from the workpiece and travels backward in the optical path of the laser light. A focus shift detection unit that detects the focus shift of the focus using the reflected inspection light reflected by the half mirror, and moves the laser light emitting mechanism relative to the workpiece to move the laser light. The laser welding machine includes a moving mechanism that adjusts the distance between the emission mechanism and the workpiece.

  Prior to the actual laser welding, this laser welding machine irradiates the inspection light from the illuminator to the work, reflects the light from the work, and passes through the optical system in the laser light emitting mechanism through which the laser light passes in the reverse direction ( By detecting the focus shift by the focus shift detection unit using the reflection inspection light, for example, it is possible to detect the focus shift that occurs due to the temperature change of the optical system in the laser beam emitting mechanism. If there is a focus shift, the focus shift is performed by adjusting the distance between the laser beam output mechanism and the workpiece by moving the laser beam output mechanism relative to the workpiece by the moving mechanism. Can be eliminated or reduced. Therefore, if the above-mentioned laser welding machine is used, the focus shift accompanying laser irradiation can be eliminated or reduced without preparing a dummy workpiece.

As the “moving mechanism”, for example, the position of the workpiece is fixed and the laser light emitting mechanism is moved to adjust the distance between them, or conversely, the position of the laser light emitting mechanism is A moving mechanism that adjusts the distance between the two by moving the workpiece, adjusting the distance between the two, a laser beam emitting mechanism, and a moving mechanism that adjusts the distance between the two are exemplified.
As the “illuminator”, in addition to an illuminator having a heat generating bulb or a fluorescent lamp, LED illumination or a separately prepared laser light source can be used.
Furthermore, in the above laser welding machine, it is preferable that the illumination tool is a laser welding machine that is an illumination tool using LEDs.

  Furthermore, in the above laser welding machine, it is preferable that the illumination tool is a laser welding machine that emits the inspection light having the same wavelength as the laser light.

Due to the chromatic dispersion of each lens of the optical system in the laser beam emitting mechanism, the focal length of each lens slightly differs for each wavelength. For this reason, when the focus shift is measured using the inspection light having a wavelength different from the wavelength of the laser light, there is a possibility that the size of the focus shift generated in the laser light emitting mechanism cannot be accurately measured. On the other hand, in the above-mentioned laser welding machine, since the inspection light has the same wavelength as that of the laser light, it is possible to accurately detect the size of the focus shift generated in the laser light emission mechanism. And based on the magnitude | size of this focus shift | offset | difference, the distance between a laser beam emission mechanism and a workpiece | work can be adjusted with a moving mechanism.
Examples of the illumination tool that emits inspection light having the same wavelength as the laser light include an LED light source adjusted to emit light having the same wavelength as the laser light used for welding and a laser light source using a laser diode.

  According to another aspect, the present invention is a laser welding machine including a laser beam emitting mechanism that deflects and emits laser light toward a workpiece, and includes an illumination tool that irradiates the workpiece with inspection light, and the laser beam emitting device. The mechanism includes a collimating lens that collimates the laser light, at least one galvano scanner that deflects the laser light that has passed through the collimating lens, a condensing lens that collects the laser light and collects it at a focal point, The laser light that is disposed between the collimating lens, the galvano scanner, and the condenser lens and passes through the collimating lens is transmitted, while the inspection light emitted from the illumination tool is reflected by the work and is Using the half mirror that reflects the reflection inspection light that travels in the reverse direction of the laser light path, and the reflection inspection light that is reflected by the half mirror, A focus shift detection unit that detects the focus shift of the focus, and moves the laser light emission mechanism relative to the workpiece to adjust the distance between the laser light emission mechanism and the workpiece. A laser welding method using a laser welding machine having a moving mechanism, wherein the inspection light is irradiated from the illuminator to the work prior to actually irradiating the work with the laser light. Using the reflected inspection light reflected from the position, the focus shift detection unit detects the focus shift, and based on the focus shift, the moving mechanism determines the distance between the laser light emitting mechanism and the workpiece. It is preferable to use a laser welding method including a welding process in which welding is performed by irradiating the workpiece with the laser beam after adjusting or eliminating or reducing the focus shift.

  In this laser welding method, prior to actual laser welding, inspection light is irradiated through the optical system in the laser light emitting mechanism through which the inspection light is irradiated from the illuminator and reflected by the work and through which the laser light passes ( The focus shift detection unit detects the focus shift using the reflection inspection light. When the focus shift has occurred, the distance between the laser beam emitting mechanism and the workpiece is adjusted by the moving mechanism to eliminate or reduce the focus shift, and then laser welding is performed on the workpiece. Therefore, according to this laser welding method, it is possible to perform laser welding without eliminating or reducing the focus shift caused by laser irradiation without preparing a dummy workpiece.

  Further, in the above laser welding method, the laser beam emitting mechanism is configured such that the focal point is positioned between the half mirror, the galvano scanner, and the condenser lens in an optical path direction along the optical path of the laser beam. A focal position changing lens system that can be changed, and the welding process corrects the position of the focal point with the focal position changing lens system so as to cancel out a focus shift occurring during the welding process. A laser welding method for performing welding is preferable.

  Since the temperature of the optical system in the laser beam emitting mechanism rises from the start of welding to the end of welding for one workpiece, it is the focus at the beginning and end of welding in the welding process. Deviation occurs. On the other hand, in the laser welding method described above, in the welding process, welding is performed on the workpiece while correcting the focal position with the focal position changing lens system so as to cancel out the focal shift generated during the welding process. It is possible to suppress the occurrence of defocusing while welding the workpiece, and to suppress the welding state from changing at the beginning and end of the welding process.

It is explanatory drawing which shows the laser welding machine which concerns on Embodiment 1. FIG. 1 is a perspective view of a battery (work) according to Embodiment 1. FIG. FIG. 4 is a plan view of the first embodiment as viewed from above the battery (workpiece). It is explanatory drawing which shows the laser welding machine which concerns on Embodiment 2. FIG.

(Embodiment 1)
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 shows a laser welding machine 1 according to the first embodiment. 2 and 3 show a battery (work) 800 to be laser welded by the laser welding machine 1. Hereinafter, the vertical direction of the laser welding machine 1 is defined as the Z direction ZH, and the direction perpendicular to the Z direction ZH is defined as the XY direction XYH (see FIG. 1). The battery 800 will be described with the battery lateral direction AH, the battery thickness direction BH, and the battery vertical direction CH set to the directions shown in FIGS.

The laser welding machine 1 includes a laser oscillator 10, an optical fiber 20, a laser light emission mechanism 30, a lighting tool 50, a moving mechanism 60, a control device 70, and the like.
Among these, the laser oscillator 10 is a fiber laser device that generates laser light LB, specifically, laser light LB having a wavelength of 1070 nm. The laser oscillator 10 and a laser beam emitting mechanism 30 described below are connected via an optical fiber 20.

  The laser beam emitting mechanism 30 is a device that deflects and emits the laser beam LB emitted from the tip of the optical fiber 20 connected thereto toward the battery 800 that is a workpiece. The laser light emitting mechanism 30 includes a collimating lens 31, two galvano scanners (first galvano scanner 33 and second galvano scanner 35), a condensing lens 37, a Z lens system (focal position changing lens system) 39, and , A half mirror 41, a defocus detection unit 43, a protective glass 49, and the like.

Among these, the collimating lens 31 is a lens that converts the laser light LB input to the laser light emitting mechanism 30 from the tip of the optical fiber 20 into parallel light traveling in the Z direction ZH (vertical direction in FIG. 1).
The first galvano scanner 33 and the second galvano scanner 35 deflect laser light LB that has passed through the collimating lens 31 and further passed through a half mirror 41 and a Z lens system 39, which will be described later, in the XY directions XYH. Each of the first galvano scanner 33 and the second galvano scanner 35 has a motor (not shown) and a total reflection mirror rotatably attached thereto, and the total reflection mirror is irradiated by rotating the motor. The angle of the laser beam LB can be deflected. The laser light LB deflected by the first galvano scanner 33 and the second galvano scanner 35 is applied to the battery 800 from the laser light emitting mechanism 30 through the protective glass 49 attached to the laser light emitting mechanism 30.

The condensing lens 37 is a lens that condenses and collects the laser beam LB at the focal point. The condenser lens 37 is disposed between the first galvano scanner 33 and the second galvano scanner 35.
The Z lens system 39 is disposed between a half mirror 41 described later and the first galvano scanner 33. The Z lens system 39 is a lens system that can change the focal position of the laser beam LB in the optical path direction LH along the optical path of the laser beam LB. Specifically, the Z lens system 39 includes a lens and a moving mechanism (not shown) that moves the lens in the optical path direction LH. By moving the lens in the optical path direction LH, the position of the focal point of the laser light LB. Are moved forward and backward in the optical path direction LH (Z direction ZH).

  The half mirror 41 is disposed between the collimating lens 31 and the Z lens system 39. The half mirror 41 transmits the laser beam LB that has passed through the collimating lens 31. On the other hand, reflected inspection light TC (reflected inspection light TC, which is reflected by the battery 800 and travels backward in the optical path of the laser beam LB) is reflected.

  In FIG. 1, the defocus detection unit 43 surrounded by a broken line is a detection unit that detects defocus using the reflection inspection light TC reflected by the half mirror 41. The defocus detection unit 43 is a detection unit that detects a defocus using a phase difference, and includes a first condensing lens 44, a second condensing lens 45, a pair of separator lenses 46, and an optical sensor 47. And have. The reflected inspection light TC reflected by the half mirror 41 passes through the first condenser lens 44 and the second condenser lens 45 and further passes through the pair of separator lenses 46. Thereby, two images are formed on the optical sensor 47. If the distance L between the two images formed coincides with the predetermined distance when the image is in focus, the image is in focus. On the other hand, when the interval L between the two images formed is wider or narrower than the predetermined interval, it can be seen that there is a focus shift having a magnitude corresponding to the difference in the interval.

Next, the lighting tool 50 will be described. This illuminating device 50 is an illuminating device using LEDs, and emits inspection light TB having the same wavelength (specifically, 1070 nm) as the above-mentioned laser light LB. The lighting tool 50 is disposed obliquely above the battery 800 and can irradiate the inspection light TB toward the case lid member 813 of the battery 800.
The moving mechanism 60 has a motor and can move the entire laser beam emitting mechanism 30 in the Z direction ZH. Thereby, the distance of the Z direction ZH between the laser beam emission mechanism 30 and the battery 800 can be adjusted.

  The control device 70 includes a CPU, a ROM, and a RAM, and includes a microcomputer that operates according to a predetermined control program stored in the ROM or the like. The control device 70 is connected to the laser oscillator 10 and can control on / off of the emission of the laser beam LB, the output of the laser beam LB, and the like. Further, the control device 70 is connected to the laser beam emitting mechanism 30 and controls the angles of the total reflection mirrors of the first galvano scanner 33 and the second galvano scanner 35, respectively, so that the laser beam LB is emitted in the XY direction XYH. Can be deflected. Further, the control device 70 can control the movement of the lens of the Z lens system 39 in the optical path direction LH to advance and retract the focal position of the laser beam LB in the optical path direction LH (Z direction ZH).

  Further, the control device 70 is connected to the moving mechanism 60, controls the movement of the laser light emitting mechanism 30 in the Z direction ZH, and the distance in the Z direction ZH between the laser light emitting mechanism 30 and the battery 800. Can be adjusted. Specifically, when a focus shift is detected by the focus shift detection unit 43, the laser light emitting mechanism 30 is moved in the Z direction ZH so as to eliminate the focus shift according to the size of the focus shift. You can control the movement. Further, the control device 70 is connected to the lighting tool 50 and can control on / off of the emission of the inspection light TB.

  Next, the battery 800 which is a workpiece will be described (see FIGS. 1 to 3). The battery 800 is a rectangular sealed battery mounted on a vehicle such as a hybrid vehicle or an electric vehicle. The battery 800 includes a battery case 810 made of a metal (specifically, aluminum) in a rectangular parallelepiped box shape. The battery case 810 includes a bottomed rectangular tube-shaped case main body member 811 and a rectangular plate-shaped case cover member 813 that closes the opening of the case main body member 811. An electrode body, an electrolytic solution, and the like (not shown) are accommodated in the case main body member 811, and a positive electrode terminal 820 and a negative electrode terminal 830 are fixed to the case lid member 813. The case main body member 811 and the case lid member 813 are laser welded over the entire circumference along the opening of the case main body member 811 and the periphery of the case lid member 813 using the laser welding machine 1 described above.

  Next, a laser welding method using the above laser welding machine 1 will be described. First, a battery 800 in which the opening of the case body member 811 is closed with a case lid member 813 (battery 800 in a state where the case body member 811 and the case lid member 813 are not yet welded) is prepared. Fix in place.

  Next, a “welding process” is performed on the battery 800. First, as shown in FIG. 3, the angles of the total reflection mirrors of the first galvano scanner 33 and the second galvano scanner 35 are controlled so that the irradiation position of the laser beam LB becomes the upper center focus position PA. At the same time, the position of the lens in the optical path direction LH of the Z lens system 39 is controlled to be adjusted to a predetermined position (a position where the focal point of the laser beam LB becomes the focusing position PA).

  Next, prior to actually irradiating the battery 800 with the laser light LB, the illumination light 50 is irradiated with the inspection light TB toward the battery 800. The inspection light TB is reflected by the battery 800, and part of the reflected reflected inspection light TC travels in the reverse direction through the optical system in the laser light emitting mechanism 30 through which the laser light LB passes. Specifically, the reflection inspection light TC passes through the protective glass 49, is reflected by the total reflection mirror of the second galvano scanner 35, passes through the condenser lens 37, and is totally reflected by the first galvano scanner 33. Reflected by. Further, the reflection inspection light TC passes through the lens of the Z lens system 39 and travels toward the half mirror 41.

  Further, the reflection inspection light TC is reflected by the half mirror 41 and enters the defocus detection unit 43. In the defocus detection unit 43, the reflection inspection light TC passes through the first condenser lens 44, the second condenser lens 45, and the pair of separator lenses 46 in this order, and forms two images on the optical sensor 47. As described above, when the distance L between the two images is a predetermined distance, the images are in focus. On the other hand, when the interval L between the two images is wider or narrower than the predetermined interval, there is a deviation in focus according to the difference in the interval. Therefore, the control device 70 controls the moving mechanism 60 based on the interval L detected by the focus deviation detection unit 43. Specifically, the laser light emitting mechanism 30 is moved in the Z direction ZH so as to eliminate the focus deviation, the distance in the Z direction ZH between the laser light emitting mechanism 30 and the battery 800 is adjusted, and the focus deviation is corrected. After the cancellation, the irradiation with the inspection light TB from the illumination tool 50 is turned off.

  Next, laser welding is performed by irradiating the battery 800 with the laser beam LB. Specifically, the laser beam LB is emitted from the laser oscillator 10. The laser light LB is input into the laser light emitting mechanism 30 through the optical fiber 20. In the laser beam emitting mechanism 30, the laser beam LB passes through the collimator lens 31 and becomes parallel light. Thereafter, the laser beam LB passes through the half mirror 41, further passes through the lens of the Z lens system 39, and is reflected by the total reflection mirror of the first galvano scanner 33. Thereafter, the laser beam LB passes through the condenser lens 37, is reflected by the total reflection mirror of the second galvano scanner 35, and is irradiated to the battery 800 from the laser beam emitting mechanism 30 through the protective glass 49.

  In the laser welding in the first embodiment, as shown in FIG. 3, the welding start / end position PB located at the upper left corner is started, and clockwise to the opening of the case body member 811 and the periphery of the case lid member 813. The process proceeds along one round and returns to the original position (when returning to the welding start / end position PB). The laser welding for one round is performed by controlling the angles of the total reflection mirrors of the first galvano scanner 33 and the second galvano scanner 35 to deflect the laser beam LB in the XY direction XYH.

  Further, in the laser welding for one round, along with the change in the deflection angle of the first galvano scanner 33 and the second galvano scanner 35, from the laser light emitting mechanism 30 to the welding position of the battery 800 (irradiation position of the laser light LB). The length of the optical path changes gradually. Therefore, welding is performed while moving the lens of the Z lens system 39 in the optical path direction LH so that the laser beam LB is always focused at any welding position on the battery 800. In the first embodiment, the relationship between the welding position and the lens position of the Z lens system 39 is determined in advance, and the lens of the Z lens system 39 is moved in the optical path direction LH based on this relationship.

  By the way, the temperature of the optical system in the laser beam emitting mechanism 30 also rises between the start of laser welding and the end of laser welding for one battery 800. For this reason, the focus shift | offset | difference accompanying a temperature rise arises also during the welding process for 1 round. Therefore, in the first embodiment, in addition to the movement of the lens of the Z lens system 39 in accordance with the above-described welding position (deflection angle), Z shift is performed so as to cancel out the focus shift generated during the welding process for one round. Laser welding is performed while moving the lens of the lens system 39 in the optical path direction LH and correcting the focal position of the laser beam LB.

  Specifically, as shown in FIG. 3 and Table 1, the laser welding path for one round is divided into 10 sections, and for each section, the focal shift caused by the temperature rise during laser welding is offset. The correction movement amount of the lens of the Z lens system 39 is determined in advance. In addition, the correction movement amount (mm) shown in Table 1 describes the movement in the traveling direction of the laser beam LB in the optical path direction LH as a plus (minus the movement in the backward direction).

When laser welding for one round is performed, as described above, the focus generated by the temperature rise during the welding process is further added to the position of the lens of the Z lens system 39 determined in advance in relation to the welding position. Laser welding is performed while moving the lens in the optical path direction LH by adding a correction movement amount of the lens for offsetting the deviation.
Thus, the welding process is completed. Thereafter, the welded battery 800 is removed and replaced with a new battery 800 before welding, and the welding process is performed again on the new battery 800 in the same manner as described above.

  As described above, in the laser welding machine 1, prior to actual laser welding, the inspection light TB is irradiated from the lighting device 50 to the battery 800, and reflected by the battery 800, and the laser light emitting mechanism 30 through which the laser light LB passes. By using the inspection light TB (reflection inspection light TC) that has passed through the optical system in the opposite direction, the focus shift detection unit 43 detects the focus shift, thereby changing the temperature of the optical system in the laser light emitting mechanism 30. It is possible to detect a focus shift that occurs with this. When the focus shift occurs, the laser beam emission mechanism 30 is moved by the moving mechanism 60 and the distance between the laser beam emission mechanism 30 and the battery 800 is adjusted to eliminate the focus shift. it can. Therefore, if the laser welding machine 1 is used, the focus shift accompanying laser irradiation can be eliminated without preparing a dummy workpiece.

Furthermore, in the laser welding machine 1 according to the first embodiment, the inspection light TB has the same wavelength as the laser light LB, so that the size of the focus shift generated in the laser light emitting mechanism 30 can be detected with high accuracy. Then, the distance between the laser beam emitting mechanism 30 and the battery 800 can be adjusted by the moving mechanism 60 based on the magnitude of this focal shift.
Further, in the laser welding method described above, welding is performed on the battery 800 while correcting the focal position by the Z lens system 39 so as to cancel out the focal shift generated during the welding process. Therefore, it is possible to suppress the occurrence of a focus shift while welding each battery 800, and to suppress the welding state from changing at the beginning and end of the welding process.

(Embodiment 2)
Next, a second embodiment will be described. The laser welding machine 1 of Embodiment 1 has the Z lens system 39, whereas the laser welding machine 100 of Embodiment 2 (see FIG. 4) uses an Fθ lens instead of the Z lens system 39. The point which has the lens unit 139 to include differs from the laser welding machine 1 of Embodiment 1. FIG. The lens unit 139 is attached outside the protective glass 49. Even if the length of the optical path from the laser beam emitting mechanism 130 to the welding position of the battery 800 is changed because the laser beam LB is deflected in the laser welding for one round by the lens unit 139, the lens unit 139 is always on the battery 800. The laser beam LB can be focused at any welding position.

  In the laser welding machine 1 of the first embodiment, the condenser lens 37 is disposed between the first galvano scanner 33 and the second galvano scanner 35. On the other hand, the laser welding machine 100 of the second embodiment is different from the laser welding machine 1 of the first embodiment in that the condenser lens 137 is disposed between the second galvano scanner 35 and the protective glass 49. . The rest is the same as in the first embodiment.

  Prior to actual laser welding, the laser welding machine 100 according to the second embodiment also irradiates the battery 800 with the inspection light TB from the illuminator 50, and uses the reflection inspection light TC to detect the focus shift by the focus shift detection unit 43. As a result, it is possible to detect a focus shift caused by a temperature change of the optical system in the laser beam emitting mechanism 30. When the focus shift occurs, the laser beam emission mechanism 30 is moved by the moving mechanism 60 and the distance between the laser beam emission mechanism 30 and the battery 800 is adjusted to eliminate the focus shift. it can. Therefore, if the laser welding machine 100 is used, the focus shift accompanying laser irradiation can be eliminated without preparing a dummy workpiece. In addition, the same part as Embodiment 1 has the same effect as Embodiment 1. FIG.

In the above, the present invention has been described with reference to the first and second embodiments. However, the present invention is not limited to the above-described first and second embodiments, and can be appropriately modified and applied without departing from the gist thereof. Needless to say, you can.
In the first and second embodiments, the illuminator using the LED is illustrated as the illuminator 50, but is not limited thereto. For example, a laser light source that emits laser light, preferably a laser light source that emits laser light having the same wavelength as the laser light LB used for welding, can also be used as the illumination tool.

DESCRIPTION OF SYMBOLS 1,100 Laser welding machine 10 Laser oscillator 30,130 Laser output mechanism 31 Collimating lens 33 1st galvano scanner 35 2nd galvano scanner 37,137 Condensing lens 39 Z lens system (focal position change lens system)
139 Lens unit 41 Half mirror 43 Defocus detection unit 49 Protective glass 50 Illuminator 60 Moving mechanism 70 Control device LB Laser light TB Inspection light TC Reflection inspection light 800 Battery (work)

Claims (2)

A laser welding machine including a laser beam emitting mechanism that deflects and emits laser beam toward a workpiece,
An illumination tool for irradiating the workpiece with inspection light is provided outside the laser beam emitting mechanism ,
The laser beam emitting mechanism is
A collimating lens that converts the laser light into parallel light;
At least one galvano scanner that deflects the laser light that has passed through the collimating lens;
A condensing lens that condenses the laser light and collects it at the focal point;
The laser light that is disposed between the collimating lens, the galvano scanner, and the condenser lens and passes through the collimating lens is transmitted, while the inspection light emitted from the illumination tool is reflected by the work and is A half mirror that reflects reflected inspection light that travels in the opposite direction of the laser beam;
Using the reflection inspection light reflected by the half mirror, and a focus shift detection unit that detects a focus shift of the focus, and
A laser welding machine comprising: a moving mechanism that adjusts a distance between the laser light emitting mechanism and the work by moving the laser light emitting mechanism relative to the work. The laser welding machine according to claim 1,
  The illuminator is an illuminator using LEDs.
Laser welding machine.