Plastic welding equipment using a laser scanning method with bundled fibers

Abstract

The present invention relates to a laser scanning type plastic welding device using a bundle fiber, and includes a scanner 10 that is composed of a laser oscillator, a light source, and a number of rotating mirrors and that irradiates a laser beam B, a beam box 20 that is provided below the scanner 10 and forms a space onto which the laser beam B is irradiated, a first holding plate 30 that is supported at the bottom end of the beam box 20 and onto which the laser beam B is irradiated, and a first bundle fiber that is supported by the first holding plate 30 and that is composed of a number of first fibers 41, 41' for branching the irradiated laser beam B into a number of first laser beams B1. 40, a second holding plate 50 supported by a pair of bridges 51 extended from the beam box 20, a second bundle fiber 60 supported by the second holding plate 50 and consisting of a plurality of second fibers 61, 61' for connecting with each of the plurality of first and second fibers 41, 41' to branch the irradiated first laser beam B2 into a plurality of second laser beams B2, and a beam guide jig 80 for selectively pressing the first cover P1 toward the housing P2 and having channels 81 formed facing each other along the periphery of the first welding frame R1, in which the outlets of the second fibers 61, 61' are located.

Description

[Technical Field]

[0001] The present invention relates to a plastic welding device, and more particularly to a laser scanning type plastic welding device using a bundle fiber, which can weld a three-dimensional temporary assembly by directly irradiating a laser beam emitted from a laser beam scanner onto first and second welding frames of a temporary assembly made of plastic using a bundle fiber. [Background technology]

[0002] Generally, two plastic components are joined by applying adhesive to one of the upper and lower components to be joined, or by joining them using ultrasonic welding, vibration welding, or hot plate welding.

[0003] However, this method causes environmental pollution due to the use of adhesives, the appearance quality of the joint is low, and the joint strength is inconsistent, so when mechanical external force is applied, the inside of the product may be damaged, and above all, there is a problem with watertightness.

[0004] To address this issue, a laser welding method has been proposed that allows for localized heat conduction and non-contact welding.

[0005] The laser beam welding method involves attaching a laser beam-transmitting plastic cover, which serves as the upper component, to an opaque plastic housing, which serves as the lower component, and then forming a temporary assembly in which a second welding frame on the edge of the housing overlaps with a first welding frame on the edge of the cover. A light source supported by a robot then irradiates a laser beam along the first and second welding frames to weld the cover to the housing. The laser beam that passes through the first welding frame of the cover is absorbed by the second welding frame of the opaque housing, causing the melted second welding frame to weld to the first welding frame, thereby joining the cover and housing.

[0006] However, plastic welding of the temporary assembly must be performed while moving the robot supporting the light source, which requires a lot of time to precisely set the robot's movement path and move it for the actual welding, resulting in low welding-related productivity.

[0007] Furthermore, the robot itself is quite expensive and takes up a lot of space, which means that the price of the plastic welding equipment is inevitably set very high. In addition, there is a problem that a large installation space is required because an effort is required to precisely set the robot's movement path. Summary of the Invention [Problem to be solved by the invention]

[0008] The present invention was created to solve the above-mentioned problems, and its object is to provide a plastic welding device of a laser scanning type using a bundle fiber, which can weld a three-dimensional temporary assembly made of plastic using a bundle fiber without employing a robot, thereby shortening the welding time and increasing welding-related productivity. [Means for solving the problem]

[0009] In order to achieve the above object, the laser scanning type plastic welding device using a bundle fiber according to the present invention is for welding a first welding frame R1 of a cover P1 made of transparent plastic through which a laser beam transmits to a second welding frame R2 of a housing P2 made of opaque plastic having a three-dimensional shape, using a laser beam, and comprises a scanner 10 which is composed of a laser oscillator, a light source, and a plurality of rotating mirrors and irradiates a laser beam B, a beam box 20 which is provided below the scanner 10 and forms a space onto which the laser beam B is irradiated, a first holding plate 30 which is supported at the bottom end of the beam box 20 and onto which the laser beam B is irradiated, and a device supported by the first holding plate 30 which irradiates the irradiated laser beam B. The laser beam splitter includes a first fiber bundle 40 consisting of a plurality of first fibers 41, 41' for splitting the first laser beam B1 into a plurality of first laser beams B1; a second holding plate 50 supported by a pair of bridges 51 extended from the beam box 20; a second fiber bundle 60 supported by the second holding plate 50 and consisting of a plurality of second fibers 61, 61' for splitting the first laser beam B2, which is coupled to each of the plurality of first and second fibers 41, 41' and irradiated, into a plurality of second laser beams B2; and a beam guide jig 80 for selectively pressing the first cover P1 toward the housing P2 and having channels 81 formed facing each other along the periphery of the first welding frame R1, in which outlets of the second fibers 61, 61' are disposed.

[0010] In a specific embodiment of the present invention, a monitoring unit 70 for monitoring the operating status using a detecting fiber 62 branched from the second bundle fiber 60 is further included.

[0011] In a specific embodiment of the present invention, the monitoring unit 70 includes a power detector 71 for detecting the output of the second laser beam B2 irradiated from the first detecting fiber 62a among the detecting fibers and confirming in real time whether the second laser beam B2 is currently being irradiated, a heat detector 72 for detecting the output of the second laser beam B2 irradiated from the second detecting fiber 62b among the detecting fibers and generating a signal for inspecting the temperature of the product weld to which the output of the irradiated second laser beam B2 is applied, and a beam profiler 73 for detecting the second laser beam B2 irradiated from the second detecting fiber 62c among the detecting fibers and confirming the characteristics of the irradiated second laser beam B2.

[0012] In a specific embodiment of the present invention, the beam box 20 further includes a contamination source inflow prevention unit 90 for preventing external contamination sources from entering the inside of the beam box 20, and the contamination source inflow prevention unit 90 includes an air inlet 91 formed on the upper side of the beam box 20 for supplying air from which foreign matter has been filtered, and a plurality of air exhaust holes 92 formed on the lower side of the beam box 20 for exhausting the air that has entered the air inlet 91.

[0013] In a specific embodiment of the present invention, the scanner 10 further includes a first cooling part 100 for cooling the first holding plate 30 while the scanner 10 is in operation.

[0014] In a specific embodiment of the present invention, the first holding plate 30 further includes a fiber temperature sensor unit 110 consisting of a plurality of temperature sensors 111, 111', which are provided on the first holding plate 30 and independently connected to the first fibers 41, 41' constituting the first fiber bundle 40, and which measure the temperature of each of the first fibers 41, 41' and generate corresponding signals.

[0015] In a specific embodiment of the present invention, the scanner 10 further includes a second cooling part 120 for cooling the second holding plate 50 while the scanner 10 is in operation. [Effects of the Invention]

[0016] According to the present invention, the first fiber bundle 40 is supported by the first holding plate 30 and is made up of a plurality of first fibers 41, 41′ for branching the irradiated laser beam B into a plurality of first laser beams B1; the second fiber bundle 60 is supported by the second holding plate 50 and is made up of a plurality of second fibers 61, 61′ for connecting with each of the plurality of first and second fibers 41, 41′ and branching the irradiated first laser beam B2 into a plurality of second laser beams B2; and the beam guide jig 80 is used to selectively pressurize the first cover P1 toward the housing P2 and has channels 81 formed along the periphery of the first welding frame R1, facing each other, through which the outlets of the second fibers 61, 61′ are disposed. This allows the second laser beam B2 to be simultaneously irradiated throughout the entire channel 81 to weld the first and second welding frames R1, R2 at the same time, thereby reducing the time required for welding and improving efficiency.

[0017] In addition, the monitoring unit 70 can monitor in real time the temperature (output) of the second laser beam B2 irradiated onto the channel 81 during the process of welding the temporary assembly P, so that it is possible to check in real time whether there is a welding defect, thereby enabling high-quality welding and facilitating maintenance. [Brief explanation of the drawings]

[0018] [Figure 1] 1 is a perspective view of a laser scanning type plastic welding device using a bundle fiber according to the present invention. [Figure 2] 2 is a perspective view showing an extracted plastic housing and cover to be welded by the welding apparatus of FIG. 1. FIG. [Figure 3]FIG. 3 is a perspective view of the main components of the laser scanning type plastic welding device of FIG. 2. [Figure 4] 4 is a perspective view illustrating a channel at the bottom edge of the beam guide jig in which the second bundle fibers of FIG. 3 are arranged in a row. FIG. [Figure 5] 2 is a diagram for explaining a fiber temperature sensor unit for independently sensing the temperature of each of the first fibers constituting the first fiber bundle of FIG. 1. FIG. [Figure 6] 4 is a diagram for explaining a first cooling part provided on the first holding plate of FIG. 3. FIG. [Figure 7] 4 is a diagram for explaining a second cooling part provided on the second holding plate of FIG. 3. FIG. [Figure 8] 3 is a perspective view for explaining that the cover is welded to the housing of FIG. 2 by a laser beam. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0019] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A detailed description of a laser scanning type plastic welding apparatus using a bundle fiber according to the present invention will now be given with reference to the accompanying drawings.

[0020] In the following, the terms "upper" or "above" may refer not only to something directly above in contact with the other, but also to something above without contact. Terms such as "first" and "second" may be used to describe various components, but the components should not be limited by these terms. Terms are used only to distinguish one component from another. A singular expression includes a plural expression unless the context clearly indicates otherwise. Furthermore, when a part "comprises" a component, this does not mean that it excludes other components, but that it may further include other components, unless otherwise specified. Furthermore, terms such as "... unit," "module," and the like used in this specification refer to a unit that performs at least one function or operation.

[0021] Fig. 1 is a perspective view of a laser scan type plastic welding device using a fiber bundle according to the present invention, Fig. 2 is a perspective view showing an excerpt of a plastic housing and cover to be welded by the welding device of Fig. 1, Fig. 3 is a perspective view of the main components of the laser scan type plastic welding device of Fig. 2, Fig. 4 is a perspective view illustrating a channel at the bottom edge of a beam guide jig in which the second fiber bundle of Fig. 3 is arranged in a row, Fig. 5 is a diagram illustrating a fiber temperature sensor unit for independently sensing the temperature of each of the first fibers constituting the first fiber bundle of Fig. 1, and Fig. 8 is a perspective view illustrating a cover welded to the housing of Fig. 2 by a laser beam.

[0022] As shown in the figure, the laser scanning type plastic welding device using a bundle fiber according to the present invention is used to use a laser beam to weld a first welding frame R1 of a cover P1 made of transparent plastic through which the laser beam passes to a second welding frame R2 of a housing P2 made of opaque plastic with a three-dimensional shape.

[0023] Such a laser scanning type plastic welding device includes a scanner 10 that is composed of a laser oscillator, a light source, and a plurality of rotating mirrors and that irradiates a laser beam B; a beam box 20 that is provided below the scanner 10 and that forms a space onto which the laser beam B is irradiated; a first holding plate 30 that is supported at the lower end of the beam box 20 and that irradiates the laser beam B; a first bundle fiber 40 that is supported by the first holding plate 30 and that consists of a plurality of first fibers 41, 41' for branching the irradiated laser beam B into a plurality of first laser beams B1; a second holding plate 50 that is supported by a pair of bridges 51 that extend from the beam box 20; a second bundle fiber 60 that is supported by the second holding plate 50 and that consists of a plurality of second fibers 61, 61' for connecting with each of the plurality of first and second fibers 41, 41' to branch the irradiated first laser beam B2 into a plurality of second laser beams B2; a monitoring unit 70 for monitoring the operating status using a detecting fiber 62 branched from the fiber bundle 60; a beam guide jig 80 for selectively pressing the first cover P1 toward the housing P2 and having channels 81 formed along the periphery of the first welding frame R1, where outlets of the second fibers 61, 61′ are disposed; a contamination source inflow prevention unit 90 for preventing external contamination sources from entering the inside of the beam box 20; a first cooling part 100 for cooling the first holding plate 30 while the scanner 10 is operating; a fiber temperature sensor unit 110 provided on the first holding plate 30 and including a plurality of temperature sensors 111, 111′, each independently connected to the first fibers 41, 41′ constituting the first fiber bundle 40, for measuring the temperature of each of the first fibers 41, 41′ and generating a corresponding signal; and a second cooling part 120 for cooling the second holding plate 50 while the scanner 10 is operating.

[0024] As shown in FIG. 2, the temporary assembly P, which consists of a cover P1 overlapping a housing P2, is completely joined by welding the first and second welding edges R1, R2 with a laser beam. After welding, the temporary assembly is completed and can be used in various fields, for example, as the body of a front lamp or rear lamp of an automobile.

[0025] The scanner 10 is comprised of a laser oscillator, a light source, and a plurality of rotating mirrors, and is a configuration commonly used in the art, so further detailed description will be omitted.

[0026] As shown in Figure 1, the beam box 20 is located below the scanner 10 and has a three-dimensional shape that forms a space into which the laser beam B is irradiated, with the entrance side facing the scanner 10 and the exit side facing the first holding plate 30.

[0027] A laser safety window 21 for checking the inside is provided in front of the beam box 20. The laser safety window 21 allows an operator to check the inside of the beam box 20 to confirm whether the welding equipment is operating normally, and protects the operator from the laser beam during the check.

[0028] As shown in FIG. 3, the first holding plate 30 is formed in the shape of a rectangular plate as a whole, and is supported on the lower end of the beam box 20 on the outlet side.

[0029] Two plate slots 31, 32 that support the inlets of a plurality of first fibers 41, 41′ are formed on the upper side of the first holding plate 30. In this case, it is preferable that the plate slots 31, 32 are provided with beam guiders (not shown) for focusing the laser beam B emitted from the scanner 10 onto the first and second fibers 41, 41′.

[0030] The first fiber bundle 40 is made up of a plurality of first fibers 41, 41' so that the incident laser beam B can be split into a plurality of first laser beams B1, and the inlet sides of the first fibers 41, 41' are located inside the plate slots 31, 32.

[0031] As shown in FIG. 3, the second holding plate 50 is formed in the shape of a square plate overall, and is supported by a pair of bridges 51 extending from the beam box 20 .

[0032] The second fiber bundle 60 includes a plurality of second fibers 61, 61' for branching the incident first laser beam B2 into a plurality of second laser beams B2. To this end, the plurality of second fibers 61, 61' are connected to each of the first fibers 41, 41' so as to branch into a plurality of units, as shown in FIG.

[0033] The monitoring unit 70 monitors the operating status using a detecting fiber 62 branched from the second bundle fiber 60, and as shown in FIG. 1, includes a power detector 71 that detects the output of the second laser beam B2 irradiated from the first detecting fiber 62a among the detecting fibers and checks in real time whether the second laser beam B2 is currently being irradiated, a heat detector 72 that detects the second laser beam B2 irradiated from the second detecting fiber 62b among the detecting fibers and generates a signal for checking the temperature of the product weld to which the output of the irradiated second laser beam B2 is applied, and a beam profiler 73 that detects the second laser beam B2 irradiated from the second detecting fiber 62c among the detecting fibers and checks the characteristics of the irradiated second laser beam B2.

[0034] Through such power detector 71, it is possible to check in real time whether the laser beam is being irradiated normally, through heat detector 72, it is possible to inspect the temperature of the product welding part to which the output of the irradiated second laser beam B2 is applied, and through beam profiler 73, it is possible to check characteristics similar to the wavelength of the irradiated second laser beam B2. The signals generated from these power detector 71, heat detector 72 and beam profiler 73 are used as signals to check in real time whether the cover P1 is being welded to the housing P2 normally, and conversely, are used as signals to generate an alarm when an abnormal event occurs.

[0035] 4, the beam guide jig 80 has a shape with an uneven surface formed to correspond to the first cover P1 so that the first welding frame R1 of the first cover P1 can be pressed. A channel 81 is formed at the bottom edge of the beam guide jig 80 along the periphery of the first welding frame R1, in which outlets of the plurality of second bundle fibers 60 are arranged.

[0036] When the beam guide jig 80 presses the cover P1 pre-assembled on the housing R2, the channel 81 faces the first and second welding frames R1 and R2. In this state, the second laser beam B2 is simultaneously irradiated onto the second fibers 61 and 61' constituting the second fiber bundle 60, and welding is performed simultaneously on all of the first and second welding frames R1 and R2 corresponding to the channel 81.

[0037] By using such a beam guide jig 80, the second welding frame R2 of the housing P2 and the first welding frame R1 of the cover P1 are welded together, and as shown in FIG. 8, the cover P1 is integrated with the housing P2.

[0038] The contamination source inflow prevention unit 90 includes an air inlet 91 formed on the upper side of the beam box 20 to supply air from which foreign matter has been filtered, and a plurality of air exhaust holes 92 formed on the lower side of the beam box 20 to exhaust the air that has flowed into the air inlet 91.

[0039] An appropriate space is required between the scanner 10 and the first bundle fiber 40 for the laser beam to diverge, and such a space is formed inside the beam box 20 .

[0040] Meanwhile, if foreign matter, such as dust or fumes generated during the welding of the temporary assembly, enters the inside of the beam box 20, the foreign matter may adhere to the inlet surfaces of the first fibers 41, 41′ constituting the first fiber bundle 40. When a laser beam is irradiated in this state, the foreign matter adhering to the inlet surfaces is burned and causes the inlet surfaces to become opaque. In this case, the opaque inlet surfaces absorb the energy of the laser beam and their temperature rises to several hundred degrees or more, which may damage the first fiber bundle 40 itself or the coating surrounding the first fiber bundle.

[0041] To prevent this, the contamination source inflow prevention unit 90 supplies air, from which foreign matter has been filtered, through the air inlet 91 to constantly maintain a positive pressure inside the beam box 20, thereby preventing external foreign matter from entering the beam box 20. This makes it possible to protect the various optical systems and the first fiber bundle 40 from external contamination sources.

[0042] The fiber temperature sensor unit 110 independently measures the temperature of each of the first fibers 41, 41' that make up the first fiber bundle 40, senses whether a specific first fiber is abnormally heated, and generates a signal so that appropriate action can be taken.The fiber temperature sensor unit 110 includes multiple temperature sensors, 20 temperature sensors 111, 111' in this embodiment.

[0043] The laser beam B emitted from the scanner 10 is irradiated onto a plurality of first fibers 41, 41' provided on the first holding plate 30. At this time, some of the laser beam B that is not incident on the entrance of the first fibers 41, 41' is absorbed around the first fibers 41, 41', and the first fibers are heated by conductive heat, which may ultimately damage them.

[0044] In the present invention, by adopting a fiber temperature sensor unit 110 consisting of a plurality of temperature sensors 111, 111' that independently measure the temperature of each of a plurality of first fibers 41, 41', it is possible to sense abnormal heating of a specific first fiber 41, 41' due to a laser beam that is not completely incident on the first fiber 41, 41', and by taking appropriate measures accordingly, it is possible to prevent damage to the first fibers 41, 41'.

[0045] FIG. 6 is a diagram for explaining a first cooling part provided on the first holding plate of FIG.

[0046] The first cooling part 100 includes a first refrigerant flow path 101 formed in a zigzag shape inside the first holding plate 30, a first inlet 102 provided on one side of the first holding plate 30 to supply refrigerant to the first refrigerant flow path 101, and a first outlet 103 provided on the other side of the first holding plate 30 to discharge the refrigerant that has passed through the refrigerant flow path 101.

[0047] This first cooling part 100 cools the heat that may be generated in the first holding plate 30 during the process of distributing the laser beam B emitted from the scanner 10 into multiple first laser beams B1, thereby preventing the first handle fiber 40 supported by the first holding plate 30 from being damaged by high heat.

[0048] FIG. 7 is a diagram for explaining a second cooling part provided on the second holding plate of FIG.

[0049] The second cooling part 120 includes a second inner refrigerant flow path 121 formed inside the inner side of the second holding plate 50, a second inner inlet 122 provided on one side of the second holding plate 50 to supply refrigerant to the second inner refrigerant flow path 121, a second inner outlet 123 provided on the other side of the second holding plate 50 to discharge the refrigerant that has passed through the second inner refrigerant flow path 121, a second outer refrigerant flow path 124 formed inside the outer side of the second holding plate 50, a second outer inlet 125 provided on one side of the second holding plate 50 to supply refrigerant to the second outer refrigerant flow path 124, and a second outer outlet 126 provided on the other side of the second holding plate 50 to discharge the refrigerant that has passed through the second outer refrigerant flow path 124.

[0050] Such second cooling part 120 cools the heat that may be generated in the second holding plate 50 during the process of distributing the first laser beam B1 irradiated from the first bundle fiber 40 into multiple second laser beams B2, thereby preventing the second bundle fiber 60 supported by the second holding plate 50 from being damaged by high heat. [Industrial Applicability]

[0051] As described above, according to the present invention, the first fiber bundle 40 is supported by the first holding plate 30 and is made up of a plurality of first fibers 41, 41′ for branching the irradiated laser beam B into a plurality of first laser beams B1; the second fiber bundle 60 is supported by the second holding plate 50 and is made up of a plurality of second fibers 61, 61′ for connecting with each of the plurality of first and second fibers 41, 41′ and branching the irradiated first laser beam B2 into a plurality of second laser beams B2; and the beam guide jig 80 is used to selectively pressurize the first cover P1 toward the housing P2 and has opposing channels 81 formed along the periphery of the first welding frame R1, through which the outlets of the second fibers 61, 61′ are disposed. This allows the second laser beam B2 to be simultaneously irradiated throughout the entire channel 81 to weld the first and second welding frames R1, R2 at the same time, thereby reducing the time required for welding and improving efficiency.

[0052] In addition, the monitoring unit 70 can monitor in real time the temperature (output) of the second laser beam B2 irradiated onto the channel 81 during the process of welding the temporary assembly P, so that it is possible to check in real time whether there is a welding defect, thereby enabling high-quality welding and facilitating maintenance.

Claims

1. The laser beam welding device is for welding a first welding frame (R1) of a cover (P1) made of transparent plastic through which a laser beam can pass to a second welding frame (R2) of a housing (P2) made of opaque plastic having a three-dimensional shape, using a laser beam; a scanner (10) that is composed of a laser oscillator, a light source, and a plurality of rotating mirrors and emits a laser beam (B); a beam box (20) provided below the scanner (10) to form a space onto which the laser beam (B) is irradiated; a first holding plate (30) supported at the lower end of the beam box (20) and onto which the laser beam (B) is irradiated; a first bundle fiber (40) supported by the first holding plate (30) and consisting of a plurality of first fibers (41, 41') for splitting the irradiated laser beam B into a plurality of first laser beams (B1); a second holding plate (50) supported by a pair of bridges (51) extending from the beam box (20); a second bundle fiber (60) supported by the second holding plate (50) and consisting of a plurality of second fibers (61, 61') for branching the first laser beam (B2) into a plurality of second laser beams (B2) coupled to each of the plurality of first and second fibers (41, 41'); A laser scanning type plastic welding device using a bundle fiber, characterized in that it includes a beam guide jig (80) that selectively presses the first cover (P1) toward the housing (P2) and has channels (81) formed opposite to each other along the periphery of the first welding frame R1, in which the outlets of the second fibers (61, 61') are arranged.

2. 2. The laser scanning type plastic welding device using a bundle fiber according to claim 1, further comprising a monitoring unit (70) for monitoring the operating status using a detecting fiber (62) branched from the second bundle fiber (60).

3. The monitoring unit (70) includes a power detector (71) for detecting the output of the second laser beam (B2) irradiated from the first detecting fiber (62a) among the detecting fibers and for checking in real time whether the second laser beam (B2) is currently being irradiated; a heat detector (72) that detects the second laser beam (B2) irradiated from the second detecting fiber (62b) among the detecting fibers and generates a signal for detecting the temperature of the welded portion of the product to which the output of the irradiated second laser beam (B2) is applied; 3. The laser scanning type plastic welding device using a fiber bundle according to claim 2, further comprising a beam profiler (73) for detecting the second laser beam (B2) irradiated from the second detecting fiber (62c) among the detecting fibers and confirming the characteristics of the irradiated second laser beam (B2).

4. The beam box further includes a contamination source inflow prevention unit (90) for preventing external contamination sources from entering the beam box (20).

2. The laser scanning type plastic welding device using a bundle fiber according to claim 1, wherein the contamination source inflow prevention unit (90) comprises an air inlet (91) formed on the upper side of the beam box (20) for supplying air from which foreign matter has been filtered and removed, and a plurality of air exhaust holes (92) formed on the lower side of the beam box (20) for exhausting the air that has flowed into the air inlet (91).

5. 2. The laser scanning type plastic welding device using a bundle fiber according to claim 1, further comprising a first cooling part (100) for cooling the first holding plate (30) while the scanner (10) is operating.

6. 2. The laser scanning type plastic welding device using a fiber bundle according to claim 1, further comprising a fiber temperature sensor unit (110) comprising a plurality of temperature sensors (111, 111′) that are provided on the first holding plate (30) and independently connected to the first fibers (41, 41′) constituting the first fiber bundle (40), measuring the temperature of each of the first fibers (41, 41′) and generating a corresponding signal.

7. 2. The laser scanning type plastic welding device using a bundle fiber according to claim 1, further comprising a second cooling part (120) for cooling the second holding plate (50) while the scanner (10) is operating.

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