Laser welding machine and optical equipment

Abstract

The invention relates to the technical field of optical fiber imaging, in particular to a laser welding machine and optical equipment. The laser welding machine comprises a six-dimensional clamping module which clamps the optical fiber to be welded to the welding center based on the six-dimensional position information of the control module; the laser heat source module outputs four paths of P polarization laser based on the welding laser information of the control module and converges the four paths of P polarization laser to a welding center; the side surface imaging module is used for acquiring first image information of the to-be-welded optical fiber and feeding back the first image information to the control module; the control module adjusts the six-dimensional position information based on the first image information, and drives the six-dimensional clamping module to clamp the to-be-welded optical fiber to move to an end face imaging position; the end face imaging module collects second image information of the to-be-welded optical fiber and feeds back the second image information to the control module; the control module also adjusts the six-dimensional position information and the welding laser information based on the second image information. The optical fiber end face alignment polarization maintaining optical fiber is observed through the integrated end face imaging module, and the optical fiber alignment precision and the welding quality are improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of optical fiber imaging, and particularly relates to a laser fusion machine and optical equipment. BACKGROUND

[0002] In the optical path design of the laser fusion machine, in order to ensure the convergence accuracy and efficiency of each laser path, the transmission optical paths for each laser path are usually arranged on the same plane, and the confocal points of each laser path are located in the central region of the optical system. From the perspective of structural design, the laser optical path needs to carry high-power laser emitters, mirror groups, focusing mirrors and other core elements, and the imaging optical path needs to be configured with filters, imaging lenses and other monitoring components. When the elements are arranged on the same plane, the installation positions of the elements inevitably overlap, for example, the mounting seat of the focusing mirror may physically interfere with the adjustment bracket of the imaging lens. Such a design makes it difficult to arrange the hardware device for observing the fusion point to effectively observe the imaging optical path of the confocal points of each laser path, which affects the fusion control effect.

[0003] At present, the laser fusion machine vertically acts on the fusion area, and interferes with the imaging module in space, so that the imaging lens can only select a large working distance low magnification lens, the imaging effect of the optical fiber is general, the internal details of the optical fiber cannot be seen, and the high-quality fusion of the optical fiber is not conducive.

[0004] The above content is only used to assist in understanding the technical solutions of the present application and does not represent the acknowledgement of the above content as prior art. SUMMARY

[0005] The main purpose of the present application is to provide a laser fusion machine and optical equipment, which aims to solve the technical problem that the laser fusion machine cannot see the internal details of the optical fiber in the prior art.

[0006] To achieve the above purpose, the present application provides a laser fusion machine, which comprises a six-dimensional clamping module, a side imaging module, an end surface imaging module and a control module.

[0007] The six-dimensional clamping module clamps the optical fiber to be fused and moves to the fusion center based on the six-dimensional position information of the control module.

[0008] The laser heat source module is arranged on the first XY plane and is used for outputting four P-polarized lasers to converge at the fusion center based on the fusion laser information of the control module, and the fusion center is located on the second XY plane outside the first XY plane.

[0009] The side imaging module is arranged around the fusion center in the second XY plane, and is used for collecting first image information of the optical fiber to be fused and feeding back the first image information to the control module.

[0010] The control module is configured to adjust the six-dimensional position information based on the first image information, and drive the six-dimensional clamping module to clamp the to-be-fused optical fiber to move to an end face imaging position according to the adjusted six-dimensional position information.

[0011] The end face imaging module is configured to move to the fusion center after the to-be-fused optical fiber moves to the end face imaging position, acquire second image information of the to-be-fused optical fiber, and feed back the second image information to the control module.

[0012] The control module is further configured to adjust the six-dimensional position information and the fusion laser information based on the second image information.

[0013] Optionally, the end face imaging module comprises an electric displacement platform and two straight-angle prisms with inclined surfaces coated with reflective films.

[0014] The two straight-angle prisms are fixedly arranged on the electric displacement platform.

[0015] The electric displacement platform is configured to drive the straight-angle prisms to move to the fusion center to acquire the second image information of the to-be-fused optical fiber.

[0016] Optionally, the side face imaging module comprises an X-axis imaging unit and a Y-axis imaging unit.

[0017] The X-axis imaging unit is arranged in the X-axis direction of the fusion center on the second XY plane.

[0018] The Y-axis imaging unit is arranged in the Y-axis direction of the fusion center on the second XY plane.

[0019] Optionally, the X-axis imaging unit and the Y-axis imaging unit each comprise a backlight, a telecentric lens and a CCD camera.

[0020] A cross line composed of a line of sight formed by the backlight and the telecentric lens is parallel to a projection of a cross line formed by convergence of four P-polarized lasers of the laser heat source module at the fusion center.

[0021] Optionally, when the straight-angle prisms move to the fusion center, central axes of the two CCD cameras are each perpendicular to a central axis of the to-be-fused optical fiber.

[0022] Normal lines of the inclined surfaces of the two straight-angle prisms are respectively arranged on angle bisectors of the central axes of the two CCD cameras and the central axis of the to-be-fused optical fiber.

[0023] Optionally, the laser heat source module comprises a P-polarized laser optical system.

[0024] The P-polarized laser light path system is arranged on the first XY plane, and is connected with the control module;

[0025] The P-polarized laser light path system is arranged on the first XY plane, and is connected with the control module;

[0026] Optionally, the P-polarized laser light path system comprises a laser, first to third P-polarized light splitters, and first to fourth mirror groups;

[0027] The laser is configured to generate P-polarized laser light based on the welding laser information of the control module;

[0028] The first P-polarized light splitter is configured to perform light splitting on the laser emitted by the laser to generate a transmitted first laser beam and a reflected second laser beam, transmit the first laser beam to the second P-polarized light splitter, and transmit the second laser beam to the third P-polarized light splitter;

[0029] The second P-polarized light splitter is configured to perform light splitting on the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmit the third laser beam to the first mirror group, and transmit the fourth laser beam to the second mirror group;

[0030] The third P-polarized light splitter is configured to perform light splitting on the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam, transmit the fifth laser beam to the mirror group, and transmit the sixth laser beam to the fourth mirror group;

[0031] The first to fourth mirror groups are configured to reflect and converge the third to sixth laser beams at the welding center to form first to fourth light paths;

[0032] The laser and the first to third P-polarized light splitters are arranged on the first XY plane, and the projection points of the reflection points of the first to fourth mirror groups on the first XY plane are symmetrically distributed relative to the welding center;

[0033] Each of the first to fourth mirror groups comprises a first planar mirror and a second planar mirror;

[0034] Each of the first planar mirrors is located on the first XY plane, and each of the second planar mirrors is located outside the first XY plane;

[0035] Each of the first planar mirrors is configured to reflect the third to sixth laser beams to the corresponding second planar mirrors along a direction parallel to the Z-axis;

[0036] Each of the second plane mirrors is configured to converge the third laser beam to the sixth laser beam at the welding center to form a first optical path to a fourth optical path.

[0037] The laser optical system further comprises a third plane mirror to a fifth plane mirror.

[0038] The third plane mirror is configured to reflect the laser emitted by the laser to the first P-polarization beamsplitter.

[0039] The fourth plane mirror is configured to reflect the first laser beam transmitted by the first P-polarization beamsplitter to the second P-polarization beamsplitter.

[0040] The fifth plane mirror is configured to reflect the second laser beam reflected by the first P-polarization beamsplitter to the third P-polarization beamsplitter.

[0041] Optionally, the laser heat source module comprises an S-polarization laser optical system.

[0042] The S-polarization laser optical system is arranged on the first XY plane, and the S-polarization laser optical system is connected to the control module.

[0043] The S-polarization laser optical system is configured to generate four P-polarization laser beams converged at the welding center based on the welding laser information of the control module.

[0044] Optionally, the S-polarization laser optical system comprises a laser, a first S-polarization beamsplitter to a third S-polarization beamsplitter, and a first plane mirror group to a fourth plane mirror group.

[0045] The first S-polarization beamsplitter is configured to split the laser emitted by the laser to generate a transmitted first laser beam and a reflected second laser beam, transmit the first laser beam to a second S-polarization beamsplitter, and transmit the second laser beam to the third S-polarization beamsplitter.

[0046] The second S-polarization beamsplitter is configured to split the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmit the third laser beam to a first plane mirror, and transmit the fourth laser beam to a second plane mirror.

[0047] The third S-polarization beamsplitter is configured to split the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam, transmit the fifth laser beam to a third plane mirror, and transmit the sixth laser beam to a fourth plane mirror.

[0048] The first to fourth plane mirrors are used for reflecting the third to sixth laser beams to converge at the welding center to form first to fourth optical paths.

[0049] The laser, the first to third S-polarization beam splitters and the first to fourth plane mirror groups are all in a first XY plane, the welding center is located outside the first XY plane, and the projection points of the reflection points of the first to fourth plane mirror groups on the first XY plane are symmetrically distributed relative to the welding center.

[0050] The first to fourth mirror groups each include a first plane mirror and a second plane mirror.

[0051] Each of the first plane mirrors and each of the second plane mirrors is located in the first XY plane.

[0052] Each of the first plane mirrors is used for reflecting the third to sixth laser beams along the first XY plane to the corresponding second plane mirror, and the third to sixth laser beams converge at the welding center after the light rays reflected by the first plane mirrors are reversely extended.

[0053] Each of the second plane mirrors is used for converging the third to sixth laser beams at the welding center to form first to fourth optical paths.

[0054] The laser optical path system further includes third to fifth plane mirrors.

[0055] The third plane mirror is used for reflecting the laser emitted by the laser to the first S-polarization beam splitter.

[0056] The fourth plane mirror is used for reflecting the first laser beam transmitted by the first S-polarization beam splitter to the second S-polarization beam splitter.

[0057] The fifth plane mirror is also used for reflecting the second laser beam reflected by the first S-polarization beam splitter to the third S-polarization beam splitter.

[0058] In addition, to achieve the above object, the application further provides an optical equipment including the laser welding machine as described above.

[0059] The application provides a laser fusion machine and optical equipment, the laser fusion machine comprising: a laser heat source module, a six-dimensional clamping module, a side imaging module, an end face imaging module and a control module; the six-dimensional clamping module clamps a to-be-fused optical fiber to move to a fusion center based on six-dimensional position information of the control module; the laser heat source module is arranged on a first XY plane and is used for outputting four P-polarized laser convergences to the fusion center based on fusion laser information of the control module, the fusion center being located on a second XY plane outside the first XY plane; the side imaging module is arranged around the fusion center in the second XY plane and is used for collecting first image information of the to-be-fused optical fiber and feeding back the first image information to the control module; the control module is used for adjusting the six-dimensional position information based on the first image information and driving the six-dimensional clamping module to clamp the to-be-fused optical fiber to move to an end face imaging position according to the adjusted six-dimensional position information; the end face imaging module is used for moving to the fusion center after the to-be-fused optical fiber moves to the end face imaging position, collecting second image information of the to-be-fused optical fiber and feeding back the second image information to the control module; and the control module is further used for adjusting the six-dimensional position information and the fusion laser information based on the second image information. The end face imaging module arranged integrally is used for observing the alignment of the optical fiber end face with the polarization maintaining optical fiber, so that the optical fiber alignment precision and the fusion quality are improved. BRIEF DESCRIPTION OF DRAWINGS

[0060] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description only show some embodiments of the present application, and other drawings can also be obtained according to the structures shown in the drawings without any creative labor.

[0061] Figure 1 It is a structural schematic diagram of the first embodiment of the laser optical path system of the present application.

[0062] Figure 2 It is a structural schematic diagram of the six-dimensional clamping module in the first embodiment of the laser fusion machine of the present application.

[0063] Figure 3 It is a structural schematic diagram of the end face imaging module in the first embodiment of the laser fusion machine of the present application.

[0064] Figure 4 It is a structural schematic diagram of the side imaging module in the first embodiment of the laser fusion machine of the present application.

[0065] Figure 5 It is a schematic diagram of the principle of the end face imaging work in the first embodiment of the laser fusion machine of the present application.

[0066] Figure 6 Structure diagram of the second embodiment of the laser fusion machine of the present application;

[0067] Figure 7 Front view structure diagram of the second embodiment of the laser light path system of the present application.

[0068] Figure 8 Structure diagram of the third embodiment of the laser fusion machine of the present application;

[0069] Figure 9 Front view structure diagram of the third embodiment of the laser light path system of the present application.

[0070] Brief Description of the Drawings: 1, laser heat source module; 2, six-dimensional clamping module; 3, side imaging module; 4, end face imaging module; 5, control module; 10, laser; 201, first P-polarization beamsplitter; 202, second P-polarization beamsplitter; 203, third P-polarization beamsplitter; 301, first mirror group; 302, second mirror group; 303, third mirror group; 304, fourth mirror group; 40, fusion center; 50, first plane mirror; 60, second plane mirror; 70, third plane mirror; 80, fourth plane mirror; 90, fifth plane mirror.

[0071] The implementation, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. DETAILED DESCRIPTION

[0072] It should be understood that the specific embodiments described herein merely exemplify the present application and are not intended to limit the present application.

[0073] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0074] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications will also change accordingly.

[0075] In addition, the description related to "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the protection scope required by the present application.

[0076] Referring to Figure 1 , Figure 1 is a structural schematic diagram of a first embodiment of the laser fusion machine of the present application, as Figure 1 indicated, in the present embodiment, the laser fusion machine comprises a laser heat source module, a six-dimensional clamping module, a side imaging module, an end face imaging module and a control module.

[0077] It should be noted that the six-dimensional clamping module can clamp the to-be-fused optical fiber to move to the fusion center based on the six-dimensional position information of the control module. The laser heat source module is arranged in the first XY plane and can be used to output four P-polarized laser beams converging at the fusion center based on the fusion laser information of the control module, and the fusion center is located in the second XY plane outside the first XY plane. The side imaging module is arranged around the fusion center in the second XY plane and can be used to collect first image information of the to-be-fused optical fiber and feed back the first image information to the control module. The control module can be used to adjust the six-dimensional position information based on the first image information, and drive the six-dimensional clamping module to clamp the to-be-fused optical fiber to move to the end face imaging position according to the adjusted six-dimensional position information. The end face imaging module can be used to move to the fusion center after the to-be-fused optical fiber moves to the end face imaging position, collect second image information of the to-be-fused optical fiber, and feed back the second image information to the control module. The control module can also be used to adjust the six-dimensional position information and the fusion laser information based on the second image information.

[0078] It should be understood that the control module can be a computer control module with professional software, which can realize the functions of information collection, processing and transmission through a pre-set software program. The image information can be data information converted from the image analog data of the to-be-fused end cap and the fiber in the fusion by a camera, an analog-to-digital conversion device or the like. The first image information can be image information for imaging and identifying the side surface of the to-be-fused fiber at the fusion center, and the second image information can be image information for imaging and identifying the end surface of the to-be-fused fiber at the fusion center. The six-dimensional adjustment of the six-dimensional clamping module can be X / Y / Z / θX / θY / θZ adjustment, which is respectively used for controlling the up-down, left-right, front-back, pitch, roll and rotation of the end cap and the fiber. The six-dimensional adjustment is all driven by a motor and controlled by six-dimensional position information output by the computer software program of the control module. The laser power of the laser heat source module can also be controlled by fusion laser information output by the computer software program of the control module. The six-dimensional electrically-adjusted fiber clamping module can further include a set of backlights for providing an illumination light source when imaging the end surface of the fiber. Referring to Figure 2 , Figure 2 FIG. 1 is a structural schematic diagram of a six-dimensional clamping module in a first embodiment of a laser fusion machine according to the present application.

[0079] Further, the end surface imaging module includes an electric displacement platform and two straight-angle prisms with reflective film on inclined surfaces. Both of the straight-angle prisms are fixedly arranged on the electric displacement platform. The electric displacement platform is used to drive the straight-angle prisms to move to the fusion center to collect the second image information of the to-be-fused fiber. Referring to Figure 3 , Figure 3 FIG. 2 is a structural schematic diagram of an end surface imaging module in the first embodiment of the laser fusion machine according to the present application.

[0080] It should be noted that when the end surface imaging module is needed to be used for imaging the end surface of the to-be-fused fiber, the straight-angle prisms in the end surface imaging module will be moved to the fusion center by the electric displacement platform. After the imaging of the end surface of the fiber is completed, the end surface imaging module will be moved to the reset origin by the electric displacement platform.

[0081] Further, the side surface imaging module includes an X-axis imaging unit and a Y-axis imaging unit. The X-axis imaging unit is arranged on the X-axis direction of the fusion center on the second XY plane, and the Y-axis imaging unit is arranged on the Y-axis direction of the fusion center on the second XY plane. Both of the X-axis imaging unit and the Y-axis imaging unit include a backlight, a telecentric lens and a CCD camera. The projection of the cross line composed of the line of sight of the backlight and the telecentric lens is parallel to the projection of the cross line composed of the four-way P-polarized laser of the laser heat source module converging at the fusion center. Referring to Figure 4 , Figure 4Structure diagram of the side imaging module in the first embodiment of the laser fusion machine.

[0082] It should be noted that the backlight, the telecentric lens and the CCD camera are all focused on the fusion center. The backlight is used to provide an illumination light source, and the telecentric lens and the CCD camera are used to image and identify the side surface of the optical fiber and the end cap at the fusion center. This is advantageous to improve the space utilization, and the opening above facilitates loading and taking the optical fiber end cap.

[0083] It should be understood that the optical fiber to be fused includes left and right optical fibers, and the center axes of the left and right optical fibers are both perpendicular to the center axes of the CCD cameras of the X and Y axes in the side imaging module. The bevels of the two right-angle prisms of the end surface imaging module are coated with high-reflective films. The normal line of the bevel of the left prism is located on the angle bisector of the right angle formed by the left optical fiber and the center axis of the Y-axis camera, so that the image of the left optical fiber is reflected by the bevel of the right-angle prism into the imaging lens of the Y-axis camera. The normal line of the bevel of the right prism is located on the angle bisector of the right angle formed by the right optical fiber and the center axis of the X-axis camera, so that the image of the right optical fiber is reflected by the bevel of the right-angle prism into the imaging lens of the X-axis camera. When the end surface imaging module is moved to the appropriate position of the fusion center by the electric displacement platform, the left and right optical fibers are translated by a fixed distance towards the X and Y cameras, respectively, so that the front end surface of the optical fiber is reflected by the bevel of the right-angle prism into the imaging lens, and a clear image is seen in the camera, realizing the identification and alignment of the polarization maintaining optical fiber cat eye. Refer to Figure 5 , Figure 5 The principle diagram of the end surface imaging work in the first embodiment of the laser fusion machine.

[0084] In a possible implementation, when the polarization maintaining optical fiber is fused, the six-dimensional electrically adjustable optical fiber clamping module clamps and fixes the optical fiber to be fused so that it appears in the side imaging module. The side imaging module images the optical fiber to be fused to form first image information. The computer software of the control module identifies the posture of the optical fiber through the first image information and controls the six-dimensional electrically adjustable optical fiber clamping module to align the optical fibers on both sides of the optical fiber to be fused. Then, the clamped optical fiber is retracted and translated in a specific direction, while the end surface imaging module moves to the fusion center to image the end surface of the optical fiber to be fused to form second image information. The computer software of the control module identifies the fast and slow axes of the optical fiber through the second image information and rotates the optical fiber by the θZ rotating motor for alignment. After the fast and slow axes of the polarization maintaining optical fiber are aligned, the end surface imaging module is moved to the reset origin by the electric displacement platform. The optical fiber reappears in the side imaging module and is aligned again. Finally, the four-beam CO2 laser heat source module is used for heating and fusion.

[0085] In this embodiment, the laser welding machine includes: a laser heat source module, a six-dimensional clamping module, a side imaging module, an end face imaging module and a control module; the six-dimensional clamping module clamps the optical fiber to be welded and moves it to the welding center based on the six-dimensional position information of the control module; the laser heat source module is set in the first XY plane, and is used to output four P-polarized lasers based on the welding laser information of the control module and converge at the welding center, and the welding center is located in a second XY plane outside the first XY plane; the side imaging module is set around the welding center in the second XY plane, and is used to collect the first XY position of the optical fiber to be welded. The six-dimensional position information is obtained by the optical fiber end face imaging module, and the first image information is fed back to the control module; the control module is used to adjust the six-dimensional position information based on the first image information, and drive the six-dimensional clamping module to clamp the optical fiber to be fused to the end face imaging position according to the adjusted six-dimensional position information; the end face imaging module is used to move to the fusion center after the optical fiber to be fused moves to the end face imaging position, collect second image information of the optical fiber to be fused, and feed the second image information back to the control module; the control module is also used to adjust the six-dimensional position information and the fusion laser information based on the second image information. The optical fiber end face is observed to align with the polarization-maintaining fiber through the integrated end face imaging module, thereby improving the optical fiber alignment accuracy and fusion quality.

[0086] Reference Figure 6 , Figure 6 FIG. 1 is a schematic structural diagram of a second embodiment of a laser welding machine according to the present invention. Figure 6 As shown, in this embodiment, the laser heat source module includes a P-polarized laser optical path system. The P-polarized laser optical path system is arranged in the first XY plane and is connected to the control module. The P-polarized laser optical path system can be used to generate four P-polarized laser beams based on the welding laser information from the control module, which converge at the welding center.

[0087] Specifically, the P-polarized laser optical path system includes: a laser, first to third P-polarization beam splitters and first to fourth reflector groups.

[0088] It should be noted that the first P-polarization beamsplitter can be used for splitting the laser emitted by the laser to generate a transmitted first laser beam and a reflected second laser beam, and transmitting the first laser beam to the second P-polarization beamsplitter and transmitting the second laser beam to the third P-polarization beamsplitter. The second P-polarization beamsplitter can be used for splitting the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, and transmitting the third laser beam to the first mirror group and transmitting the fourth laser beam to the second mirror group. The third P-polarization beamsplitter can be used for splitting the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam, and transmitting the fifth laser beam to the mirror group and transmitting the sixth laser beam to the fourth mirror group. The first to fourth mirror groups can be used for reflecting the third to sixth laser beams to converge at the fusion center to form first to fourth optical paths.

[0089] It should be understood that the laser can be a carbon dioxide laser, which outputs carbon dioxide laser as a heat source, and the laser is linearly polarized laser. The first to third P-polarization beamsplitters can each divide the incident light into two beams of equal power, one of which is transmitted without change in direction, and the other of which is reflected by 90°. For a P-polarization beamsplitter, only P-polarized light can achieve power splitting, and both the transmitted light and the reflected light are P-polarized light. Therefore, the installation direction of the laser can make the linearly polarized light meet the P-polarized incident when it reaches the P-polarization beamsplitter. The first to fourth mirror groups can be optical components composed of plane mirrors that reflect and converge laser beams at the fusion center, and the laser passes through the first to fourth mirror groups to form first to fourth optical paths converging at the fusion center.

[0090] Specifically, the P-polarized laser generated by the laser passes through the first P-polarization beamsplitter to be divided into a transmitted first laser beam and a 90° reflected second laser beam, and the first laser beam and the second laser beam have equal power and are both P-polarized light. The first laser beam enters the second P-polarization beamsplitter to be divided again into a transmitted third laser beam and a 90° reflected fourth laser beam, and the third laser beam and the fourth laser beam have equal power and are both P-polarized light. Similarly, the second laser beam enters the third P-polarization beamsplitter to be divided again into a transmitted fifth laser beam and a 90° reflected sixth laser beam, and the fifth laser beam and the sixth laser beam have equal power and are both P-polarized light. The third, fourth, fifth, and sixth laser beams converge at the fusion center through the first to fourth mirror groups, respectively.

[0091] The laser and the first to third P-polarization beamsplitters are in the XY plane, the fusion center is located outside the XY plane, and the projection points of the reflection points of the first to fourth mirror groups on the XY plane are symmetrically distributed relative to the fusion center.

[0092] It should be noted that, since the projection points of the reflection points of the first to fourth mirror groups on the XY plane are symmetrically distributed relative to the welding center, the distances from the laser light outlets to the welding center through the first to fourth light paths are equal, and the incident angles and the exit angles on the corresponding mirrors are also the same, which have complete consistency, ensuring that the optical paths of the four laser beams reaching the welding center are equal and the effects are consistent. Meanwhile, the four laser beams converging at the welding center have P polarization relative to the XY plane.

[0093] Since the laser light path design is almost not coplanar with the welding center, the imaging light path on the plane of the laser light path and the welding center does not interfere, and the installation structure of each can be conveniently designed, improving the control accuracy of the convergence of each laser beam.

[0094] Reference Figure 7 , Figure 7 is a front view structural diagram of a second embodiment of the laser light path system of the present application, as Figure 7 indicated, in this embodiment, the same or similar contents as the first embodiment described above can be referred to the above introduction, and will not be described in detail. The first to fourth mirror groups each include a first plane mirror and a second plane mirror.

[0095] It should be noted that each of the first plane mirrors is located on the XY plane, and each of the second plane mirrors is located outside the XY plane; each of the first plane mirrors is used for reflecting the third to sixth laser beams to the corresponding second plane mirrors along the direction parallel to the Z axis; and each of the second plane mirrors is used for converging the third to sixth laser beams at the welding center to form the first to fourth light paths.

[0096] It should be understood that, since the aforementioned laser and the first to third P-polarization beam splitters are coplanar with the XY plane, each of the first plane mirrors is also located on the XY plane, in order to realize that the welding center is not on the XY plane, each of the second plane mirrors which is not on the XY plane needs to be arranged to realize that the third to sixth laser beams converge at the welding center. At the same time, in order to ensure that the optical paths of the four laser beams reaching the welding center are equal and the effects are consistent, the second plane mirrors are arranged at the same distance along the direction parallel to the Z axis corresponding to each of the first plane mirrors. So that the first to sixth laser beams are all P-polarized, and the polarization direction of the laser beam is parallel to the XY plane.

[0097] Specifically, the second plane mirrors converge to form a first to fourth optical path with the Z-axis direction forming a 60-degree angle. According to the optical theory, compared with the laser vertically acting on the XY plane, the P-polarized laser with a 60-degree angle with the Z-axis has higher transmittance (i.e. higher laser absorption rate) and lower reflectivity when heating the end cap front end surface parallel to the XY plane, thereby improving the laser power utilization rate and reducing the influence of reflected stray light.

[0098] Further, the laser optical system can further include a third plane mirror. The third plane mirror is located on the XY plane. The third plane mirror can be used to reflect the laser emitted by the laser to the first P-polarized beam splitter. Similarly, the laser optical system can further include a fourth plane mirror and a fifth plane mirror. The fourth plane mirror and the fifth plane mirror are both located on the XY plane. The fourth plane mirror can be used to reflect the first laser beam transmitted by the first P-polarized beam splitter to the second P-polarized beam splitter. The fifth plane mirror can be used to reflect the second laser beam reflected by the first P-polarized beam splitter to the third P-polarized beam splitter. By setting the plane mirror, the laser direction can be changed, and the overall size design can be optimized.

[0099] It should be noted that the fourth plane mirror and the fifth plane mirror can be replaced by a cylindrical mirror. The cylindrical mirror can focus the laser in one dimension, so that the circular spot converges into an elliptical spot, thereby improving the laser power density without reducing the laser heating range. The above four second plane mirrors can also be replaced by cylindrical mirrors with shorter focal length to further improve the laser power density.

[0100] In this embodiment, the first to fourth mirror groups of the laser optical system each include a first plane mirror and a second plane mirror. A third plane mirror located on the XY plane is used to reflect the laser emitted by the laser to the first P-polarized beam splitter. A fourth plane mirror and a fifth plane mirror located on the XY plane are used to reflect the first laser beam transmitted by the first P-polarized beam splitter to the second P-polarized beam splitter and to reflect the second laser beam reflected by the first P-polarized beam splitter to the third P-polarized beam splitter. Each of the first plane mirrors is located on the XY plane, and each of the second plane mirrors is located outside the XY plane. The laser emitted by the laser passes through the first to fourth optical paths with equal distances, and the first to fourth optical paths form a 60-degree angle with the Z-axis direction, thereby improving the laser power utilization rate and reducing the influence of reflected stray light.

[0101] Reference Figure 8 , Figure 8A structure schematic diagram of a third embodiment of the laser welding machine is shown in the figure. Figure 8 As shown in the figure, in this embodiment, the same or similar contents as the above embodiments can be referred to the above introduction, and the subsequent will not be described in detail. The laser light path system comprises a laser, first to third S-polarization beam splitters, and first to fourth mirror groups.

[0102] It should be noted that the first S-polarization beam splitter can be used for splitting the laser emitted by the laser to generate a transmitted first laser beam and a reflected second laser beam, transmitting the first laser beam to the second S-polarization beam splitter, and transmitting the second laser beam to the third S-polarization beam splitter. The second S-polarization beam splitter can be used for splitting the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmitting the third laser beam to the first mirror group, and transmitting the fourth laser beam to the second mirror group. The third S-polarization beam splitter can be used for splitting the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam, transmitting the fifth laser beam to the mirror group, and transmitting the sixth laser beam to the fourth mirror group. The first to fourth mirror groups can be used for reflecting the third to sixth laser beams to converge at the welding center to form first to fourth light paths.

[0103] It should be understood that the laser can adopt a carbon dioxide laser as a heat source to output carbon dioxide laser, and the laser is linearly polarized laser. The first to third S-polarization beam splitters can each divide the incident light into two beams of equal power, one transmitted light direction unchanged, and the other light reflected by 90°. For the S-polarization beam splitter, only the incident light is S-polarized light to achieve power sharing, and the transmitted light and the reflected light are both S-polarized light. Therefore, the installation direction of the laser can make the linearly polarized light meet the S-polarized incident when reaching the S-polarization beam splitter. The first to fourth mirror groups can be optical components composed of plane mirrors to reflect and converge the laser beams at the welding center. The laser passes through the first to fourth mirror groups to form first to fourth light paths converging at the welding center.

[0104] Specifically, the S-polarized laser generated by the laser passes through the first S-polarized beam splitter to be divided into a transmitted first laser beam and a 90° reflected second laser beam, the power of the first laser beam and the second laser beam is equal and both are P-polarized light. The first laser beam enters the second S-polarized beam splitter to be divided again into a transmitted third laser beam and a 90° reflected fourth laser beam, the power of the third laser beam and the fourth laser beam is equal and both are P-polarized light. Similarly, the second laser beam enters the third S-polarized beam splitter to be divided again into a transmitted fifth laser beam and a 90° reflected sixth laser beam, the power of the fifth laser beam and the sixth laser beam is equal. The third laser beam, the fourth laser beam, the fifth laser beam and the sixth laser beam are respectively converged on the welding center through the first to fourth reflecting mirrors.

[0105] The laser, the first to third S-polarized beam splitters and the first to fourth plane reflecting mirror groups are all in the XY plane, the welding center is located outside the XY plane, and the projection points of the reflecting points of the first to fourth reflecting mirror groups on the XY plane are symmetrically distributed relative to the welding center. The first laser beam and the second laser beam are both in S-polarized state, and the polarization direction is perpendicular to the XY plane. The third laser beam to the sixth laser beam are all in P-polarized state, and the polarization direction is parallel to the XY plane.

[0106] It should be noted that, due to the symmetric distribution of the projection points of the reflecting points of the first to fourth reflecting mirror groups on the XY plane relative to the welding center, the distances from the laser light outlet to the welding center through the first to fourth light paths are equal, and the incident angle and the exit angle on the corresponding reflecting mirror are also the same, which has complete consistency, ensuring that the optical paths of the four laser beams reaching the welding center are equal and consistent. At the same time, the four laser beams converging on the welding center are all in P-polarized state relative to the XY plane.

[0107] Due to the laser light path design and the welding center being almost not coplanar, the imaging light path on the plane of the laser light path and the welding center will not interfere, and the installation structure of each laser light path can be conveniently designed, improving the control accuracy of the convergence of each laser light path.

[0108] Reference Figure 9 , Figure 9 is a front view structural diagram of a third embodiment of the laser light path system of the present application, as Figure 9 shown, in this embodiment, the same or similar contents as the above embodiments can be referred to the above introduction, and will not be described in detail. The first to fourth reflecting mirror groups each include a first plane mirror and a second plane mirror, and each of the first plane mirrors and the second plane mirrors is located in the XY plane.

[0109] It should be noted that each of the first plane mirrors is used to reflect the third laser beam to the sixth laser beam along the XY plane to the corresponding second plane mirror, and the light rays reflected by each of the first plane mirrors converge at the welding center after being reversely extended; each of the second plane mirrors is used to converge the third laser beam to the sixth laser beam at the welding center to form the first to fourth optical paths.

[0110] It should be understood that, since the aforementioned laser and the first to third S-polarization beam splitters are in the XY plane, each of the first plane mirrors and a plane mirror are also located in the XY plane, in order to realize that the welding center is not in the XY plane, the projection of the light rays reflected by each of the first plane mirrors converging at the welding center in the XY plane after being reversely extended is needed to be set, so that the third laser beam to the sixth laser beam can converge at the welding center. At the same time, in order to ensure that the optical paths of the four laser beams reaching the welding center are equal and the effects are consistent, the second plane mirror and each of the first plane mirrors are correspondingly arranged at the same distance along the direction parallel to the Z axis. Further, the third laser beam to the sixth laser beam are converted from S-polarization state to P-polarization state, and the polarization direction of the laser beam is parallel to the XY plane.

[0111] Specifically, each of the second plane mirrors converging at the welding center forms a first to fourth optical path, and each of the first to fourth optical paths forms an angle of 60 degrees with the Z axis direction. According to the optical theory knowledge, compared with the laser vertically acting on the XY plane, the P-polarized laser with an angle of 60 degrees with the Z axis has higher transmittance (i.e. higher laser absorption rate) and lower reflectivity when heating the front end surface of the end cap parallel to the XY plane, which improves the laser power utilization rate and reduces the influence of reflected stray light.

[0112] Further, the laser optical system can further include a third plane mirror. The third plane mirror is located in the XY plane. The third plane mirror can be used to reflect the laser emitted by the laser to the first S-polarization beam splitter. Similarly, the laser optical system can further include a fourth plane mirror and a fifth plane mirror; the fourth plane mirror and the fifth plane mirror are both located in the XY plane; the fourth plane mirror can be used to reflect the first laser beam transmitted by the first P-polarization beam splitter to the second S-polarization beam splitter; the fifth plane mirror can be used to reflect the second laser beam reflected by the first S-polarization beam splitter to the third S-polarization beam splitter. By setting the plane mirror, the direction of the laser can be changed, and the overall size design can be optimized.

[0113] It should be noted that the fourth plane mirror and the fifth plane mirror can be replaced by a cylindrical mirror, which can focus the laser in one dimension, so that the circular spot converges into an elliptical spot, thereby improving the laser power density without reducing the laser heating range. The four second plane mirrors can also be replaced by cylindrical mirrors with shorter focal lengths to further improve the laser power density.

[0114] In the embodiment, the first to fourth mirror groups of the laser light path system each include a first plane mirror and a second plane mirror. A third plane mirror located in the XY plane is used to reflect the laser emitted by the laser to the first S-polarization beamsplitter. A fourth plane mirror and a fifth plane mirror located in the XY plane are used to reflect the first laser beam transmitted by the first S-polarization beamsplitter to the second S-polarization beamsplitter and reflect the second laser beam reflected by the first S-polarization beamsplitter to the third S-polarization beamsplitter. Each of the first plane mirrors and the second plane mirrors is located outside the XY plane. The laser emitted by the laser passes through the first to fourth light path distances, respectively, and converges at the four laser beams at the welding center, and the polarization state of the laser relative to the XY plane is P-polarization. Meanwhile, the first to fourth light paths form an angle of 60 degrees with the Z-axis direction, thereby improving the laser power utilization rate and reducing the influence of reflected stray light.

[0115] The above merely describes the preferred embodiments of the present application, and does not limit the protection scope of the present application. Any equivalent structure or equivalent flow transformation based on the content of the specification and the drawings, or direct or indirect application in other related technical fields, are also included in the protection scope of the present application.

[0116] Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the protection scope of the present application.

[0117] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain posture (as shown in the drawings), and if the certain posture changes, the directional indications also change accordingly.

[0118] In addition, the descriptions in the present application involving "first", "second" and the like are only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of various embodiments can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of such technical solutions does not exist, nor within the protection scope required by the present application.

Claims

1. A laser welding machine, characterized in that: The laser welding machine includes: a laser heat source module, a six-dimensional clamping module, a side imaging module, an end face imaging module and a control module; The six-dimensional clamping module clamps the optical fiber to be spliced ​​and moves it to the splicing center based on the six-dimensional position information of the control module; The laser heat source module is arranged in a first XY plane and is used to output four P-polarized lasers based on the welding laser information of the control module and converge at the welding center, and the welding center is located in a second XY plane outside the first XY plane; The side imaging module is arranged around the fusion center in the second XY plane, and is used to collect first image information of the optical fiber to be fusion-spliced, and feed the first image information back to the control module; The control module is configured to adjust the six-dimensional position information based on the first image information, and drive the six-dimensional clamping module to clamp the optical fiber to be spliced ​​and move it to an end face imaging position according to the adjusted six-dimensional position information; The end face imaging module is used to move to the fusion center after the optical fiber to be fused moves to the end face imaging position, collect second image information of the optical fiber to be fused, and feed the second image information back to the control module; The control module is further configured to adjust the six-dimensional position information and the welding laser information based on the second image information.

2. The laser welding machine according to claim 1, characterized in that The end face imaging module includes: an electric displacement platform and two right-angle prisms with reflective coatings on the inclined surfaces; The two right-angle prisms are both fixedly mounted on the electric displacement platform; The electric displacement platform is used to drive the right-angle prism to move to the fusion center to collect the second image information of the optical fiber to be fused.

3. The laser welding machine according to claim 2, characterized in that: The side imaging module includes: an X-axis imaging unit and a Y-axis imaging unit; The X-axis imaging unit is arranged in the X-axis direction of the welding center on the second XY plane; The Y-axis imaging unit is arranged in the Y-axis direction of the welding center on the second XY plane.

4. The laser welding machine according to claim 3, characterized in that The X-axis imaging unit and the Y-axis imaging unit both include: a backlight, a telecentric lens and a CCD camera; The cross line formed by the sight line formed by the backlight and the telecentric lens is parallel to the projection of the cross line formed by the four P-polarized lasers of the laser heat source module converging at the welding center.

5. The laser welding machine according to claim 4, characterized in that: When the right-angle prism moves to the fusion center, the central axes of the two CCD cameras are perpendicular to the central axes of the optical fibers to be fused; The normal lines of the inclined surfaces of the two right-angle prisms are respectively arranged on the angle bisectors of the central axes of the two CCD cameras and the central axis of the optical fibers to be fused.

6. The laser welding machine according to claim 1, wherein: The laser heat source module includes: a P-polarized laser light path system; The P-polarized laser light path system is arranged in the first XY plane, and the P-polarized laser light path system is connected to the control module; The P-polarized laser optical path system is used to generate four P-polarized laser beams based on the welding laser information of the control module, which are then converged at the welding center.

7. The laser welding machine according to claim 6, characterized in that: The P-polarized laser optical path system includes: a laser, first to third P-polarized beam splitters and first to fourth reflector groups; The laser is used to generate P-polarized laser light based on the welding laser information of the control module; a first P-polarization beam splitter, configured to perform a splitting process on the laser light emitted by the laser to generate a transmitted first laser beam and a reflected second laser beam, transmit the first laser beam to the second P-polarization beam splitter, and transmit the second laser beam to the third P-polarization beam splitter; The second P-polarization beam splitter is used to perform a splitting process on the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmit the third laser beam to the first reflector group, and transmit the fourth laser beam to the second reflector group; The third P-polarization beam splitter is used to perform a splitting process on the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam, transmit the fifth laser beam to the reflector group, and transmit the sixth laser beam to the fourth reflector group; The first to fourth reflecting mirror groups are used to reflect the third to sixth laser beams and converge them at the welding center to form first to fourth optical paths; The laser and the first to third P-polarization beam splitters are arranged on the first XY plane, and the projection points of the reflection points of the first to fourth reflector groups on the first XY plane are symmetrically distributed relative to the welding center; The first to fourth reflector groups each include: a first plane reflector and a second plane reflector; Each of the first plane reflectors is located in the first XY plane, and each of the second plane reflectors is located outside the first XY plane; Each of the first plane reflecting mirrors is used to reflect the third laser beam to the sixth laser beam along a direction parallel to the Z axis to the corresponding second plane reflecting mirror; Each of the second plane reflective mirrors is used to converge the third laser beam to the sixth laser beam at the welding center to form first to fourth optical paths; The laser optical path system further includes: a third plane reflecting mirror to a fifth plane reflecting mirror; The third plane reflecting mirror is used to reflect the laser light emitted by the laser to the first P-polarization beam splitter; a fourth plane reflecting mirror, configured to reflect the first laser beam transmitted by the first P-polarization beam splitter to the second P-polarization beam splitter; The fifth plane reflecting mirror is used to reflect the second laser beam reflected by the first P-polarization beam splitter to the third P-polarization beam splitter.

8. The laser welding machine according to claim 1, wherein: The laser heat source module includes: an S-polarized laser light path system; The S-polarized laser light path system is arranged in the first XY plane, and the S-polarized laser light path system is connected to the control module; The S-polarized laser optical path system is used to generate four paths of P-polarized laser light after the S-polarized laser light is split based on the welding laser information of the control module and converge at the welding center.

9. The laser welding machine according to claim 8, characterized in that: The S-polarized laser optical path system includes: a laser, first to third S-polarized beam splitters and first to fourth plane reflector groups; a first S-polarization beam splitter, configured to perform a splitting process on the laser light emitted by the laser to generate a transmitted first laser beam and a reflected second laser beam, transmit the first laser beam to the second S-polarization beam splitter, and transmit the second laser beam to the third S-polarization beam splitter; The second S-polarization beam splitter is used to perform beam splitting processing on the first laser beam to generate a transmitted third laser beam and a reflected fourth laser beam, transmit the third laser beam to the first plane reflector, and transmit the fourth laser beam to the second plane reflector; The third S-polarization beam splitter is used to perform beam splitting processing on the second laser beam to generate a transmitted fifth laser beam and a reflected sixth laser beam, transmit the fifth laser beam to the third plane reflective mirror, and transmit the sixth laser beam to the fourth plane reflective mirror; The first to fourth plane reflectors are used to reflect the third to sixth laser beams and converge them at the welding center to form first to fourth optical paths; The laser, the first to third S-polarization beam splitters, and the first to fourth plane reflector groups all share a first XY plane, the welding center is located outside the first XY plane, and the projection points of the reflection points of the first to fourth plane reflector groups on the first XY plane are symmetrically distributed relative to the welding center; The first to fourth reflector groups each include: a first plane reflector and a second plane reflector; Each of the first plane reflectors and each of the second plane reflectors are located in the first XY plane; Each of the first plane reflectors is configured to reflect the third to sixth laser beams along the first XY plane to the corresponding second plane reflector, and the light rays of the third to sixth laser beams reflected by each of the first plane reflectors are extended in the reverse direction and converged at the welding center; Each of the second plane reflective mirrors is used to converge the third laser beam to the sixth laser beam at the welding center to form first to fourth optical paths; The laser optical path system further includes: a third plane reflecting mirror to a fifth plane reflecting mirror; The third plane reflecting mirror is used to reflect the laser light emitted by the laser to the first S-polarization beam splitter; a fourth plane reflecting mirror, configured to reflect the first laser beam transmitted by the first S-polarization beam splitter to the second S-polarization beam splitter; The fifth plane reflecting mirror is further configured to reflect the second laser beam reflected by the first S-polarization beam splitter to the third S-polarization beam splitter.

10. An optical device, characterized in that: The optical device includes the laser welding machine according to any one of claims 1 to 9.

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