Laser welding system with adjustable collimated spot size, device and method of use

Abstract

The application discloses a laser welding system with adjustable collimated light spot size, a device and a device use method, and belongs to the technical field of laser welding reliability. The laser welding system comprises a collimated light source, a collimated light source is used for emitting collimated laser; a posture adjusting laser vibration mirror is arranged on the output light path of the collimated light source and is used for turning the collimated laser emitted by the collimated light source; a laser reflection adjusting device is arranged on the output light path of the posture adjusting laser vibration mirror and is used for reflecting the collimated laser output by the posture adjusting laser vibration mirror to output collimated laser with different powers; and a laser adjusting device is arranged on the output light path of the laser reflection adjusting device and is used for adjusting the power of the collimated laser according to different welding requirements. The application realizes accurate distribution of laser energy, accurate adjustment of light spot size and flexible control of laser power. Thus, the problem that the array span non-equal-size welding points exist between the power special-purpose boards and the welding cannot be performed at one time is solved.

Description

Technical Field

[0001] This invention belongs to the field of laser welding reliability technology, specifically relating to a laser welding system, apparatus, and method of using the apparatus with adjustable collimated spot size. Background Technology

[0002] Currently, laser welding technology is beginning to be applied in the field of electronic assembly. Laser welding features non-contact heating, good thermal effect, uniform beam, and continuous laser energy. An optical system focuses the laser beam into a very small area, directly irradiating the welding area. The welding area absorbs light energy and converts it into heat energy, raising its temperature to the welding temperature, causing the solder to melt and wet. After laser heating stops, the welding area cools, the solder solidifies, forming an alloy layer, thus achieving the purpose of electrical connection. Current laser welding technology for board-to-board connector welding is mature, but it can only complete the welding of board-to-board connector joints of equal size in one pass. For power supply board-to-board connector arrays with unequal spans, multiple adjustments to the laser mechanism position and changes to the output spot size are required to adapt to the welding requirements of different joints. This laser adjustment work means that the laser output energy, spot size, and laser structure all need to be constantly adjusted during the welding process. This not only disrupts the normal production cycle but also introduces additional positioning errors due to repeated adjustments, resulting in more equipment debugging time. Summary of the Invention

[0003] The purpose of this invention is to provide a laser welding system, apparatus, and method of using the collimated laser spot size adjustable, which outputs different laser energies under the same collimated laser emission power to simultaneously weld joints with different energy requirements; and overcomes the shortcomings of the prior art by adjusting the spot size of different weld joints under different energy requirements through a laser adjustment device.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] In a first aspect, the present invention provides a laser welding system with adjustable collimated spot size, comprising:

[0006] Collimated light source; a collimated light source is used to emit collimated laser light.

[0007] An attitude-adjusting laser galvanometer is placed in the output optical path of a collimating light source to redirect the collimated laser emitted by the collimating light source.

[0008] A laser reflection adjustment device is installed in the output optical path of the attitude adjustment laser galvanometer to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers.

[0009] The laser adjustment device is located in the output optical path of the laser reflection adjustment device and is used to adjust the power of the collimated laser for different welding requirements.

[0010] Furthermore, the laser reflection adjustment device includes a primary rotating beam splitter module and a secondary rotating mirror module; the primary rotating beam splitter module is located on the output optical path of the attitude-adjusting laser galvanometer, and the secondary rotating mirror module is located on the output optical path of the primary rotating beam splitter module; the primary rotating beam splitter module reflects a portion of the collimated laser output from the attitude-adjusting laser galvanometer to the secondary rotating mirror module, and transmits the other portion to the laser adjustment device.

[0011] Furthermore, the laser adjustment device includes a first plano-concave lens moving module and a second plano-concave lens moving module;

[0012] The first plano-concave lens moving module is set on the output optical path of the first-stage rotating beam splitter module, and the first plano-convex lens module is coaxially set on the output optical path of the first plano-concave lens moving module; the first plano-concave lens moving module is used to receive the collimated laser transmitted by the first-stage rotating beam splitter module and, together with the first plano-convex lens module, adjust the power of the collimated laser.

[0013] The second plano-concave lens moving module is disposed on the output optical path of the secondary rotating mirror module, and a second plano-convex lens module is coaxially disposed on the output optical path of the second plano-concave lens moving module; the second plano-concave lens moving module is used to receive the collimated laser transmitted by the secondary rotating mirror module and to adjust the power of the collimated laser by the second plano-convex lens module.

[0014] Secondly, the present invention provides a laser welding apparatus with adjustable collimated spot size, comprising:

[0015] Collimated light source; a collimated light source is used to emit collimated laser light.

[0016] An attitude-adjusting laser galvanometer is placed in the output optical path of a collimating light source to redirect the collimated laser emitted by the collimating light source.

[0017] A laser reflection adjustment device is installed in the output optical path of the attitude adjustment laser galvanometer to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers.

[0018] The laser adjustment device is set in the output optical path of the laser reflection adjustment device. It is used to adjust the power of the collimated laser to form the required spot size according to different welding requirements.

[0019] Furthermore, the laser reflection adjustment device includes a primary rotating beam splitter module and a secondary rotating mirror module. The primary rotating beam splitter module includes several beam splitters with different reflectivities and a frame, with the beam splitters arranged in an arc array on the frame surface. The primary rotating beam splitter module has a window at the radially facing position of the frame, and an inner indexing plate at the upper end of the frame. The primary rotating beam splitter module is rotated and adjusted along the axial direction, and the beam splitters transmit the laser light incident from the attitude adjustment laser galvanometer radially through the window to the secondary rotating mirror module.

[0020] The secondary rotating reflector module includes several reflectors with different reflectivities and a housing; the housing is fitted around the frame, and an outer ring indexing plate is provided at the upper end of the housing. The housing and the frame are coaxially rotatably connected, and several reflectors are arranged in an arc array on the inner surface of the housing on the same side of the window.

[0021] Furthermore, the laser adjustment device includes a first plano-concave lens module moving cavity and a second plano-concave lens module moving cavity. A first laser range amplification cavity is fixedly connected below the first plano-concave lens module moving cavity, and a first plano-convex lens module bearing cavity is fixedly connected below the first laser range amplification cavity. A second laser range amplification cavity is fixedly connected below the second plano-concave lens module moving cavity, and a second plano-convex lens module bearing cavity is fixedly connected below the second laser range amplification cavity.

[0022] Furthermore, a first plano-concave lens moving module is detachably disposed within the moving cavity of the first plano-concave lens module, and a second plano-concave lens moving module is detachably disposed within the moving cavity of the second plano-concave lens module; both the first and second plano-concave lens moving modules are driven by a motor to move within their respective moving cavities; a first plano-convex lens module is fixed within the bearing cavity of the first plano-convex lens module, and a second plano-convex lens module is fixed within the bearing cavity of the second plano-convex lens module.

[0023] Furthermore, the inner dial is engraved with gear position markings, and the outer dial is engraved with gear position markings.

[0024] Furthermore, the inner and outer indexing plates are connected by a rotating ratchet to achieve coaxial limiting indexing rotation.

[0025] Thirdly, the present invention provides a method for using a laser welding device with adjustable collimation spot size, comprising the following steps:

[0026] Step 1: According to the welding requirements of the first welding point, rotate the first-stage rotating beam splitter module to the beam splitter with the reflectivity required for welding.

[0027] Step 2: The first plano-concave lens moving module moves up and down along the first plano-concave lens module moving cavity to a position that can form the welding spot size required for the first welding point;

[0028] Step 3: According to the welding requirements of the second welding point, rotate the secondary rotating reflector module to the reflector that achieves the required reflectivity for welding.

[0029] Step 4: The second plano-concave lens moving module moves up and down along the second plano-concave lens module moving cavity to a position that can form the welding spot size required for the second welding point;

[0030] Step 5: Start the collimating light source and perform welding on point 1 and point 2 to be welded;

[0031] Step Six: Repeat steps one through four until all solder joints are completed.

[0032] Compared with the prior art, the present invention has the following beneficial technical effects:

[0033] This invention provides a laser welding system with adjustable collimated spot size. A collimated light source emits collimated laser light, and an attitude-adjusting laser mirror is placed in the collimated optical path to redirect the collimated laser. A laser reflection adjustment device reflects the collimated laser light output from the attitude-adjusting laser mirror, outputting collimated lasers of different powers, enabling simultaneous welding of solder joints with different energy requirements. A laser adjustment device adjusts the power of the collimated laser for different welding needs, allowing for spot size adjustment for different solder joints under varying energy requirements. Through the combined action of the attitude-adjusting laser mirror, laser reflection adjustment device, and laser adjustment device, precise laser energy distribution, accurate spot size adjustment, and flexible laser power control can be achieved. This solves the problem of power supply board connectors having arrays with unequal spacing solder joints, which cannot be welded in a single operation.

[0034] The present invention provides a laser welding device with adjustable collimated spot size, comprising a collimated light source, an attitude-adjusting laser galvanometer, a laser reflection adjustment device, and a laser adjustment device, which can adapt to a variety of different welding needs;

[0035] Specifically, it includes a first plano-concave lens module moving cavity and a second plano-concave lens module moving cavity, as well as the first plano-concave lens moving module and the second plano-concave lens moving module therein. Since the first plano-concave lens module moving cavity and the second plano-concave lens module moving cavity can be driven by a motor to move the plano-concave lens moving module within the cavity, and they work in coordination with the first plano-convex lens module and the second plano-convex lens module respectively, they can change the propagation characteristics of light, thereby achieving precise adjustment of the light spot size.

[0036] The present invention employs a primary rotating beamsplitter module comprising multiple beamsplitters with different reflectivities arranged in an arc array on the frame surface. The inner indexing plate at the upper end of the frame is marked with position indicators and can be rotated axially for adjustment. Operators can select a beamsplitter with a suitable reflectivity by rotating the inner indexing plate according to different welding power requirements. This beamsplitter transmits the laser beam incident from the attitude-adjusting laser galvanometer radially through a window to the secondary rotating mirror module. Multiple mirrors with different reflectivities in the secondary rotating mirror module are arranged in an arc array on the inner surface of the outer shell, and the outer shell and the frame of the primary rotating beamsplitter module are coaxially rotatably connected. An outer indexing plate, also marked with position indicators, is located at the upper end of the outer shell. Depending on different welding conditions, a suitable mirror can be selected by rotating the outer indexing plate to further adjust the reflection of the laser beam transmitted from the primary rotating beamsplitter module. This design allows for flexible distribution and reflection adjustment of laser energy. Beamsplitters with different reflectivities can be selected according to welding requirements to achieve different laser power outputs, enabling the device to handle welding tasks with varying power requirements.

[0037] Specifically, the modular design of the device allows for the addition of rotating mirror modules and the increase in the number of rotating mirror modules to meet different spot size requirements, based on actual welding needs. Attached Figure Description

[0038] Figure 1 This is a schematic diagram of a laser welding system with adjustable collimation spot size according to an embodiment of the present invention.

[0039] Figure 2 This is a schematic diagram of a laser welding device with adjustable collimation spot size according to an embodiment of the present invention.

[0040] Figure 3 This is a half-sectional schematic diagram of a laser welding device with adjustable collimation spot size according to an embodiment of the present invention.

[0041] Figure 4 This is a top view schematic diagram of the laser reflection adjustment device in an embodiment of the present invention.

[0042] Figure 5 This is a bottom view schematic diagram of the laser reflection adjustment device in an embodiment of the present invention.

[0043] Figure 6 This is a schematic diagram of a laser welding system that meets three different welding point requirements in an embodiment of the present invention.

[0044] In the diagram, 1. Collimating light source; 2. First-stage rotating beam splitter module; 2-1. Beam splitter; 3. First plano-concave lens moving module; 4. First plano-convex lens module; 5. Second plano-convex lens module; 6. Second plano-concave lens moving module; 7. Second-stage rotating reflector module; 7-1. Reflector; 8. Attitude-adjusting laser galvanometer; 9. Housing; 10-1. First plano-concave lens module moving cavity; 10-2. Second plano-concave lens module moving cavity; 11-1. First laser range amplification cavity; 11-2. Second laser range amplification cavity; 12-1. First plano-convex lens module bearing cavity; 12-2. Second plano-convex lens module bearing cavity; 13. Frame; 14. Window; 15. Outer indexing plate; 16. Inner indexing plate. Detailed Implementation

[0045] To enable those skilled in the art to better understand the present invention, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present invention.

[0046] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this invention are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of the invention described herein can be implemented in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0047] Example 1

[0048] See Figure 1 This invention provides a laser welding system with adjustable collimated spot size, comprising:

[0049] A collimated light source is used to emit collimated laser light; it provides the initial laser source for the entire system.

[0050] An attitude-adjusting laser galvanometer is placed in the output optical path of a collimating light source to redirect the collimated laser emitted by the collimating light source. The redirection angle of the attitude-adjusting laser galvanometer can be calibrated and finely adjusted, or the angle can be deflected as needed. When the collimated laser enters the attitude-adjusting laser galvanometer, the angle adjustment function of the attitude-adjusting laser galvanometer redirects the collimated laser, allowing the collimated laser to be transmitted according to a preset direction and angle.

[0051] A laser reflection adjustment device is installed in the output optical path of the attitude adjustment laser galvanometer to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers.

[0052] For example, the laser reflection adjustment device includes a first-stage rotating beam splitter module and a second-stage rotating reflector module, which can adjust the transmission path and power distribution of the laser. The first-stage rotating beam splitter module is located on the output optical path of the attitude-adjusting laser galvanometer, and the second-stage rotating reflector module is located on the output optical path of the first-stage rotating beam splitter module. The first-stage rotating beam splitter module reflects a portion of the collimated laser output from the attitude-adjusting laser galvanometer to the second-stage rotating reflector module, and transmits the other portion to the laser adjustment device.

[0053] The laser adjustment device, located in the output optical path of the laser reflection adjustment device, is used to adjust the power of the collimated laser for different welding requirements; the power of the collimated laser can be precisely adjusted according to different welding requirements.

[0054] The laser adjustment device includes a first plano-concave lens moving module and a second plano-concave lens moving module.

[0055] For example, the first plano-concave lens moving module is disposed on the output optical path of the first-stage rotating beam splitter module, and the first plano-convex lens module is coaxially disposed on the output optical path of the first plano-concave lens moving module; the first plano-concave lens moving module is used to receive the collimated laser transmitted by the first-stage rotating beam splitter module and, together with the first plano-convex lens module, adjust the power of the collimated laser.

[0056] The second plano-concave lens moving module is positioned on the output optical path of the secondary rotating mirror module, and a second plano-convex lens module is coaxially positioned on the output optical path of the second plano-concave lens moving module. The second plano-concave lens moving module receives the collimated laser transmitted from the secondary rotating mirror module and, together with the second plano-convex lens module, adjusts the power of the collimated laser. The first and second plano-concave lens moving modules cooperate with the first and second plano-convex lens modules, respectively. By adjusting the relative position or spacing between the lenses, the power of the collimated laser on different paths can be adjusted, enabling the system to adjust the spot size for different solder joints under different energy requirements.

[0057] Example 2

[0058] See Figures 2 to 5 This invention provides a laser welding apparatus with adjustable collimated spot size, employing the aforementioned laser welding optical path system with adjustable collimated spot size, comprising:

[0059] Collimating light source 1, used to emit collimated laser light;

[0060] The attitude-adjusting laser galvanometer 8 is set in the output optical path of the collimating light source 1 and is used to redirect the collimated laser emitted by the collimating light source 1.

[0061] A laser reflection adjustment device is installed in the output optical path of the attitude adjustment laser galvanometer 8 to reflect the collimated laser output from the attitude adjustment laser galvanometer 8 to output collimated lasers of different powers.

[0062] For example, the laser reflection adjustment device includes a primary rotating beam splitter module 2 and a secondary rotating reflector module 7. The primary rotating beam splitter module 2 is located below the attitude adjustment laser galvanometer 8. The primary rotating beam splitter module 2 includes several beam splitters 2-1, and these beam splitters 2-1 have different reflectivities; such as Figure 4 As shown, five beam splitters 2-1 with different reflectivities are bonded to the surface of the frame 13 in an arc array. The first-stage rotating beam splitter module 2 has a window 14 at the radial facing position of the frame 13. An inner ring indexing plate 16 is riveted to the upper end of the frame 13. The inner ring indexing plate 16 is engraved with a stop mark, so that the first-stage rotating beam splitter module 2 can be rotated and adjusted along the axis as needed. The five beam splitters 2-1 with different reflectivities on the first-stage rotating beam splitter module 2 can transmit the collimated laser emitted by the attitude adjustment laser galvanometer 8 radially through the window 14 on the frame 13 to the second-stage rotating mirror module 7.

[0063] The secondary rotating reflector module 7 includes several reflectors 7-1 with different reflectivities and a housing 9; the housing 9 is fitted around the frame 13, and an outer ring indexing plate 15 is provided on the upper end of the housing 9. The housing 9 and the frame 13 are coaxially rotatably connected, and several reflectors 7-1 are arranged in an arc array on the inner surface of the housing 9 on the same side of the window 14.

[0064] like Figure 5 As shown, the outer shell 9 of the secondary rotating mirror module 7 is fitted around the frame 13. The secondary rotating mirror module 7 includes five mirrors 7-1 with different reflectivities. An outer ring indexing plate 15 is riveted to the upper end of the outer shell 9 and the outer ring indexing plate 15 is engraved with a stop mark. The outer ring indexing plate 15 and the inner ring indexing plate 16 are connected by a rotating ratchet to achieve coaxial limit indexing rotation.

[0065] The equipment operator can select the position of the inner ring indexing disk 16 on the first-stage rotating beam splitter module 2 according to the different laser welding power required for different welding points. This will make the beam splitter 2-1 with the required reflectivity coaxial with the collimated laser transmitted from the attitude adjustment laser galvanometer 8. One of the selected beam splitters 2-1 on the first-stage rotating beam splitter module 2 will reflect part of the collimated laser through the window 14 to the second-stage rotating reflector module 7, and the other part will be transmitted to the laser adjustment device.

[0066] The laser adjustment device is set in the output optical path of the laser reflection adjustment device. It is used to adjust the power of the collimated laser to form the required spot size according to different welding requirements.

[0067] For example, the laser adjustment device includes a first plano-concave lens module moving cavity 10-1 and a second plano-concave lens module moving cavity 10-2. A first laser range amplification cavity 11-1 is fixedly connected below the first plano-concave lens module moving cavity 10-1, and a first plano-convex lens module carrying cavity 12-1 is fixedly connected below the first laser range amplification cavity 11-1. A first plano-concave lens moving module 3 is detachably disposed inside the first plano-concave lens module moving cavity 10-1. The first plano-concave lens moving module 3 can move up and down inside the first plano-concave lens module moving cavity 10-1 by a motor. A first plano-convex lens module 4 is fixed inside the bearing cavity 12-1; a second laser range amplification cavity 11-2 is fixedly connected below the second plano-concave lens module moving cavity 10-2, and a second plano-convex lens module bearing cavity 12-2 is fixedly connected below the second laser range amplification cavity 11-2; a second plano-concave lens moving module 6 is detachably installed inside the second plano-concave lens module moving cavity 10-2; the second plano-concave lens moving module 6 can move up and down inside the second plano-concave lens module moving cavity 10-2 driven by a motor; and a second plano-convex lens module 5 is fixed inside the second plano-convex lens module bearing cavity 12-2.

[0068] The collimated laser transmitted from the first-stage rotating beam splitter module 2 to the laser adjustment device is received by the first plano-concave lens module moving cavity 10-1. When the collimated laser enters the first plano-concave lens module moving cavity 10-1, the motor drives the first plano-concave lens module 3 to move up and down within the first plano-concave lens module moving cavity 10-1. The relative distance between the first plano-concave lens module 3 and the first plano-convex lens module 4 changes. Combined with the processing of the first laser range amplification cavity 11-1, the laser is amplified into scattered laser. After passing through the first plano-convex lens module 4, it is converged again into the parallel laser required for the solder joint, thereby changing the power and spot size of the collimated laser of the line.

[0069] The collimated laser reflected by the first-stage rotating beam splitter module 2 to the second-stage rotating mirror module 7 is received by the moving cavity 10-2 of the second plano-concave lens module. When the collimated laser enters the moving cavity 10-2, the motor drives the second plano-concave lens module 6 to move up and down within the cavity. This change in the relative distance between the second plano-concave lens module 6 and the second plano-convex lens module 5, combined with processing by the second laser range amplification cavity 11-2, amplifies the laser into scattered laser light. This light is then converged again by the second plano-convex lens module 5 into the parallel laser light required for the solder joint, thus changing the power and spot size of the collimated laser in this circuit. Consequently, the laser adjustment device outputs two different laser energies.

[0070] Specifically, during routine maintenance, the first plano-convex lens module 4 and the second plano-convex lens module 5 can be removed from the first plano-convex lens module carrier cavity 12-1 and the second plano-convex lens module carrier cavity 12-2, and the excess material and dust that have seeped into the first laser range amplification cavity 11-1 and the second laser range amplification cavity 11-2 can be cleaned.

[0071] See Figure 6 In some preferred embodiments of the present invention, if future design requirements necessitate laser welding of three or more weld joints of different sizes and with varying energy requirements, the secondary rotating mirror module is modified to a secondary rotating beam splitter module, and a tertiary rotating mirror module is added, still arranged in an arc-window-coaxial configuration. Taking three weld joints of different sizes and with varying energy requirements as an example: the primary rotating beam splitter module splits the incident laser into two paths. The first path, a transmitted laser, completes welding of the first group of weld joints through the moving cavity of the plano-concave lens module and the laser range amplification cavity; the second path, a reflected laser, is incident on the secondary rotating beam splitter module.

[0072] The secondary rotating beam splitter module can split the incident laser into two paths. The first path is transmitted laser, which completes the welding of the second set of welding points through the moving cavity of the plano-concave lens module and the laser range amplification cavity. The second path is reflected laser, which is incident on the tertiary rotating mirror module.

[0073] The three-stage rotating mirror module directs the incident laser through the moving cavity of the plano-concave lens module and the laser range amplification cavity to complete the welding of the third set of weld points. Subsequently, structural iterations can be performed, and by appropriately increasing the output power of the collimating laser, the welding needs of more non-uniformly sized weld points can be met.

[0074] Example 3

[0075] This invention provides a method for using a laser welding device with adjustable collimation spot size, comprising the following steps:

[0076] Step 1: According to the welding requirements of the first welding point, rotate the first-stage rotating beam splitter module to the beam splitter with the reflectivity required for welding.

[0077] Step 2: The first plano-concave lens moving module moves up and down along the first plano-concave lens module moving cavity to a position that can form the welding spot size required for the first welding point;

[0078] Step 3: According to the welding requirements of the second welding point, rotate the secondary rotating reflector module to the reflector that achieves the required reflectivity for welding.

[0079] Step 4: The second plano-concave lens moving module moves up and down along the second plano-concave lens module moving cavity to a position that can form the welding spot size required for the second welding point;

[0080] Step 5: Start the collimating light source and weld the two points to be soldered together;

[0081] Step Six: Repeat steps one through four until all solder joints are completed.

[0082] For example, the collimated spot size adjustable laser welding device of the present invention is mounted on a laser welding equipment with a gantry motion mechanism. The collimated light source 1 of the present invention is docked with the laser generator of the laser welding equipment, the housing 9 is connected to the rotation angle controller of the laser welding equipment, and the first plano-concave lens moving module 3 and the second plano-concave lens moving module 6 are respectively connected to the displacement controller of the laser welding equipment in the first plano-concave lens module moving cavity 10-1 and the second plano-concave lens module moving cavity 10-2. The power supply board connector waiting to be welded is placed on the guide rail of the equipment, and the alignment is completed by applying the industry-standard CCD recognition MARK technology. The welding parameters of the array non-uniform weld points are programmed according to industry experience: spot size and laser power requirements.

[0083] Step 1: According to the process requirements of the weld point of product A to be welded: spot size, laser power, the first-level rotating beam splitter module 2 responds to the command of the equipment rotation angle controller and rotates to the beam splitter 2-1 with the required reflectivity of the process.

[0084] Step 2: The first plano-concave lens moving module 3 responds to the command of the equipment displacement controller and moves along the first plano-concave lens module moving cavity 10-1 to the position where the required spot size for forming weld point A can be formed;

[0085] Step 3: Based on the process requirements of weld point B of the product being welded: spot size and laser power, the secondary rotating reflector module 7 responds to the command of the equipment rotation angle controller and rotates to the reflector 7-1 with the required reflectivity for the process.

[0086] Step 4: The second plano-concave lens moving module 6 responds to the command of the equipment displacement controller and moves along the second plano-concave lens module moving cavity 10-2 to the position where the required spot size for forming the B welding point can be formed;

[0087] In actual production, steps one, two, three, and four involve the process parameters driving the equipment controller to operate automatically in parallel.

[0088] Step 5: The laser generator of the laser welding equipment is started to weld points A and B.

[0089] It should be noted that when the collimated laser is first injected into the collimating light source 1, the collimation of the laser is calibrated by the attitude adjustment laser galvanometer 8. If the collimated laser is not injected into the collimating light source 1 for the first time, the attitude adjustment laser galvanometer 8 does not need to be adjusted.

[0090] Step Six: Repeat steps one through four to complete the soldering of non-uniform solder joints in this typical power connector array.

[0091] Specific processes in the production process:

[0092] Collimated light source 1 outputs collimated laser light of a certain power. The collimated laser light is split into two paths at the first-stage rotating beam splitter module 2. The first path is transmitted through the first-stage rotating beam splitter module 2. The parallel laser light passes through the first plano-concave lens moving module 3 and is amplified into scattered laser light within the first laser range amplification cavity 11-1. Then, it is converged again by the first plano-convex lens module 4 to become the parallel laser light required for solder point A, with a coverage area equal to the required spot size for solder point A. The second path is reflected from the first-stage rotating beam splitter module 2. The parallel laser light is reflected through window 14 to the second-stage rotating mirror module 7. Then, it passes through the mirror 7-1, which is parallel to the first-stage rotating beam splitter module 2, and the parallel laser light is incident on the second plano-concave lens moving module 6. It is amplified into scattered laser light within the second laser range amplification cavity 11-2 and then converged again by the second plano-convex lens module 5 to become the parallel laser light required for solder point B, with a coverage area equal to the required spot size for solder point B.

[0093] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A laser welding system with adjustable collimated spot size, characterized in that, include: Collimated light source; a collimated light source is used to emit collimated laser light. An attitude-adjusting laser galvanometer is placed in the output optical path of a collimating light source to redirect the collimated laser emitted by the collimating light source. A laser reflection adjustment device is installed in the output optical path of the attitude adjustment laser galvanometer to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers. A laser adjustment device is installed in the output optical path of the laser reflection adjustment device to adjust the power of the collimated laser for different welding requirements; The laser reflection adjustment device includes a primary rotating beam splitter module and a secondary rotating mirror module; the primary rotating beam splitter module is located on the output optical path of the attitude-adjusting laser galvanometer, and the secondary rotating mirror module is located on the output optical path of the primary rotating beam splitter module; the primary rotating beam splitter module reflects a portion of the collimated laser output from the attitude-adjusting laser galvanometer to the secondary rotating mirror module, and transmits the other portion to the laser adjustment device; The first-stage rotating beam splitter module includes several beam splitters with different reflectivities and a frame. The beam splitters are arranged in an arc array on the surface of the frame. The first-stage rotating beam splitter module has a window at the radial facing position of the frame, and an inner indexing plate is provided at the upper end of the frame. The stop of the first-stage rotating beam splitter module is rotated and adjusted along the axial direction. The beam splitter transmits the laser light incident by the attitude adjustment laser galvanometer radially through the window to the second-stage rotating reflector module. The secondary rotating reflector module includes several reflectors with different reflectivities and a housing; the housing is fitted around the frame, and an outer ring indexing plate is provided at the upper end of the housing. The housing and the frame are coaxially rotatably connected, and several reflectors are arranged in an arc array on the inner surface of the housing on the same side of the window. The laser adjustment device includes a first plano-concave lens moving module and a second plano-concave lens moving module. The first plano-concave lens moving module is set on the output optical path of the first-stage rotating beam splitter module, and the first plano-convex lens module is coaxially set on the output optical path of the first plano-concave lens moving module; the first plano-concave lens moving module is used to receive the collimated laser transmitted by the first-stage rotating beam splitter module and, together with the first plano-convex lens module, adjust the power of the collimated laser. The second plano-concave lens moving module is set on the output optical path of the secondary rotating mirror module, and the second plano-convex lens module is coaxially set on the output optical path of the second plano-concave lens moving module. The second plano-concave lens moving module is used to receive the collimated laser transmitted by the second-stage rotating mirror module and to adjust the power of the collimated laser using the second plano-convex lens module.

2. A laser welding device with adjustable collimated spot size, characterized in that, The laser welding system with adjustable collimated spot size as described in claim 1 includes: Collimated light source; a collimated light source is used to emit collimated laser light. An attitude-adjusting laser galvanometer is placed in the output optical path of a collimating light source to redirect the collimated laser emitted by the collimating light source. A laser reflection adjustment device is installed in the output optical path of the attitude adjustment laser galvanometer to reflect the collimated laser output by the attitude adjustment laser galvanometer to output collimated lasers of different powers. The laser adjustment device is set in the output optical path of the laser reflection adjustment device. It is used to adjust the power of the collimated laser to form the required spot size according to different welding requirements.

3. The laser welding device with adjustable collimated spot size according to claim 2, characterized in that, The laser reflection adjustment device includes a primary rotating beam splitter module and a secondary rotating reflector module. The primary rotating beam splitter module includes several beam splitters with different reflectivities and a frame. The beam splitters are arranged in an arc array on the surface of the frame. The primary rotating beam splitter module has a window at the radial facing position of the frame, and an inner indexing plate is provided at the upper end of the frame. The primary rotating beam splitter module is rotated and adjusted along the axial direction. The beam splitters transmit the laser light incident from the attitude adjustment laser galvanometer radially through the window to the secondary rotating reflector module. The secondary rotating reflector module includes several reflectors with different reflectivities and a housing; the housing is fitted around the frame, and an outer ring indexing plate is provided at the upper end of the housing. The housing and the frame are coaxially rotatably connected, and several reflectors are arranged in an arc array on the inner surface of the housing on the same side of the window.

4. The laser welding device with adjustable collimated spot size according to claim 3, characterized in that, The laser adjustment device includes a first plano-concave lens module moving cavity and a second plano-concave lens module moving cavity. A first laser range amplification cavity is fixedly connected below the first plano-concave lens module moving cavity, and a first plano-convex lens module bearing cavity is fixedly connected below the first laser range amplification cavity. A second laser range amplification cavity is fixedly connected below the second plano-concave lens module moving cavity, and a second plano-convex lens module bearing cavity is fixedly connected below the second laser range amplification cavity.

5. The laser welding device with adjustable collimated spot size according to claim 4, characterized in that, The first plano-concave lens module is detachably disposed in the moving cavity of the first plano-concave lens module, and the second plano-concave lens module is detachably disposed in the moving cavity of the second plano-concave lens module. Both the first plano-concave lens module and the second plano-concave lens module are driven by a motor to move within their respective moving cavities. The first plano-convex lens module is fixed in the bearing cavity of the first plano-convex lens module, and the second plano-convex lens module is fixed in the bearing cavity of the second plano-convex lens module.

6. The laser welding device with adjustable collimated spot size according to claim 4, characterized in that, The inner dial has gear position markings engraved on it, and the outer dial has gear position markings engraved on it.

7. The laser welding device with adjustable collimated spot size according to claim 4, characterized in that, The inner and outer indexing plates are connected by a rotating ratchet to achieve coaxial limiting indexing rotation.

8. A method of using a laser welding apparatus with adjustable collimated spot size as described in any one of claims 2-7, characterized in that, Includes the following steps: Step 1: According to the welding requirements of the first welding point, rotate the first-stage rotating beam splitter module to the beam splitter with the reflectivity required for welding. Step 2: The first plano-concave lens moving module moves up and down along the first plano-concave lens module moving cavity to a position that can form the welding spot size required for the first welding point; Step 3: According to the welding requirements of the second welding point, rotate the secondary rotating reflector module to the reflector that achieves the required reflectivity for welding. Step 4: The second plano-concave lens moving module moves up and down along the second plano-concave lens module moving cavity to a position that can form the welding spot size required for the second welding point; Step 5: Start the collimating light source and weld the two points to be soldered together; Step Six: Repeat steps one through four until all solder joints are completed.

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