Laser spot adjusting device, method and laser processing apparatus

Abstract

The application discloses a laser spot adjusting device, a laser spot adjusting method and a laser processing equipment. The laser spot adjusting device comprises a displacement adjusting assembly, a motor, a diaphragm disc and a control mechanism. The motor is arranged on the displacement adjusting assembly. The diaphragm disc is connected to an output shaft of the motor and is provided with a plurality of diaphragm light holes. The control mechanism is electrically connected with the displacement adjusting assembly and the motor respectively. An encoder position value is stored in the control mechanism. The control mechanism is used for adjusting the rotation angle of the motor and the displacement of the displacement adjusting assembly based on the encoder position value. When adjusting the spot of the laser beam emitted by the laser equipment, the control mechanism adjusts the rotation angle of the motor and the displacement of the displacement adjusting assembly based on the encoder position value, so that the position of the target diaphragm light hole of the diaphragm disc corresponds to the position of the laser beam emitted by the laser equipment, thereby avoiding the center of the laser beam from deviating from the center of the diaphragm light hole, and improving the laser processing effect.

Description

Technical Field

[0001] This application relates to the field of laser processing technology, specifically to a laser spot adjustment device, method, and laser processing equipment. Background Technology

[0002] Laser processing equipment often uses apertures of different sizes. The aperture determines the shape and diffraction effect of the laser beam, and thus the processing effect. The energy distribution of the laser beam is usually Gaussian or flat-topped. If the axis of the laser beam is offset from the center of the aperture, the shape and energy distribution of the beam after passing through the aperture will be affected, and the processing effect will deviate from the expected result. Summary of the Invention

[0003] In order to overcome the problems existing in the prior art, the main objective of this application is to provide a laser spot adjustment device that can prevent the laser beam axis from shifting from the center of the aperture.

[0004] To achieve the above objectives, this application specifically adopts the following technical solution: This application provides a laser spot adjustment device, which includes: Displacement adjustment assembly; The motor is disposed on the displacement adjustment assembly; An aperture plate is connected to the output shaft of the motor, and the aperture plate is provided with multiple aperture light-passing holes; The control mechanism is electrically connected to the displacement adjustment component and the motor respectively, and the control mechanism stores the encoder position value corresponding to each of the aperture disks. The control mechanism is used to adjust the rotation angle of the motor and the displacement of the displacement adjustment component based on the encoder position value, so that the center of the target aperture light-transmitting hole corresponding to the aperture disk is coaxial with the axis of the laser beam emitted by the laser device.

[0005] In some embodiments, the encoder position values ​​include motor rotation angle values ​​and displacement adjustment component displacement values, and each aperture corresponds to a set of encoder position values.

[0006] In some embodiments, the aperture disk is circular, and a plurality of aperture holes are distributed at circumferential intervals along the aperture disk.

[0007] In some embodiments, the laser spot adjustment device further includes a mounting base, which is mounted on the displacement adjustment assembly, and the motor is mounted on the mounting base.

[0008] In some embodiments, the displacement adjustment assembly includes a fixed base, a driving member, and a slide table. The slide table is slidably connected to the fixed base, the mounting base is mounted on the slide table, the driving member is disposed on the fixed base and connected to the slide table, and the driving member is used to drive the slide table to move.

[0009] In some embodiments, the slide moves horizontally and / or vertically.

[0010] In some embodiments, the mounting base is mounted to the slide by screws; and / or The motor is mounted to the mounting base by screws.

[0011] Correspondingly, this application also provides a laser processing device, which includes a laser and a laser spot adjustment device as described in any of the above embodiments. The laser is used to emit a laser beam, and the laser spot adjustment device is used to adjust the spot shape and diffraction effect of the laser beam emitted by the laser. The laser beam adjusted by the laser spot adjustment device is used to process circuit boards.

[0012] Accordingly, this application also provides a laser spot adjustment method, applied to the laser spot adjustment device as described in any of the above embodiments; the laser spot adjustment method includes: Obtain the encoder position values ​​corresponding to each aperture; Determine the target aperture; Obtain the encoder position value corresponding to the target aperture; Based on the encoder position value, adjust the rotation angle of the motor and the displacement of the displacement adjustment component to make the axis of the laser beam emitted by the laser device coaxial with the center of the target aperture.

[0013] In some embodiments, obtaining the encoder position values ​​corresponding to each aperture includes: As the laser beam passes through each aperture in sequence... If the laser beam spot shifts, adjust the rotation angle of the motor and the displacement of the displacement adjustment component to make the laser beam coaxial with the aperture. Then record the rotation angle value of the motor and the displacement value of the displacement adjustment component as the encoder position value of the aperture. If the laser beam spot does not shift, record the rotation angle of the motor and the displacement value of the displacement adjustment component as the encoder position value of the aperture.

[0014] In some embodiments, adjusting the rotation angle of the motor and the displacement of the displacement adjustment component includes: Adjust the rotation angle of the motor so that the height of the target aperture is consistent with the height of the laser beam spot; Adjust the displacement of the displacement adjustment component so that the center of the target aperture is coaxial with the axis of the laser beam.

[0015] Compared to existing technologies, the laser spot adjustment device of this application includes a displacement adjustment component, a motor, an aperture plate, and a control mechanism. The motor is mounted on the displacement adjustment component, the aperture plate is connected to the output shaft of the motor, and the aperture plate has multiple aperture light-passing holes. The control mechanism is electrically connected to the displacement adjustment component and the motor, and stores the encoder position value corresponding to each aperture plate. When adjusting the spot of the laser beam emitted by the laser device, the control mechanism adjusts the rotation angle of the motor and the displacement of the displacement adjustment component based on the encoder position value, so that the position of the target aperture light-passing hole of the corresponding aperture plate corresponds to the position of the laser beam emitted by the laser device, thereby avoiding the center of the laser beam from deviating from the center of the aperture light-passing hole and improving the laser processing effect. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a front view of an existing aperture plate.

[0018] Figure 2 A schematic diagram of the existing aperture plate mounting structure.

[0019] Figure 3 A perspective view of the laser spot adjustment device provided in the embodiments of this application.

[0020] Figure 4 This is a front view of the laser spot adjustment device provided in an embodiment of this application.

[0021] Figure 5 A side view of the laser spot adjustment device provided in an embodiment of this application.

[0022] Figure 6 This is a top view of the laser spot adjustment device provided in an embodiment of this application.

[0023] Figure 7 An exploded perspective view of the laser spot adjustment device provided in the embodiments of this application.

[0024] Figure 8A flowchart of a laser spot adjustment method provided in an embodiment of this application.

[0025] Figure 9 This is a light spot diagram of the laser beam after passing through the aperture in the aperture disk provided in the embodiment of this application.

[0026] Figure 10 This is a pattern of the laser beam after it passes through an aperture using existing technology.

[0027] Attached image labels: 1. Displacement adjustment assembly; 2. Electric motor; 3. Aperture plate; 31. Aperture light aperture; 4. Mounting base; 41. Fixing part; 42. Mounting part; 421. Mounting hole; 5. Screws; 100. Aperture plate; 101. Aperture light aperture. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0029] In the description of this application, unless otherwise expressly specified and limited, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; unless otherwise specified or explained, the term "multiple" refers to two or more, and the term "various types" refers to two or more; the terms "connection," "fixed," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, an integral connection, or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0030] In the description of this specification, it should be understood that the directional terms such as "upper" and "lower" used in the embodiments of this application are used to describe the angles shown in the accompanying drawings and should not be construed as limiting the embodiments of this application. Furthermore, in the context, it should also be understood that when it is mentioned that an element is connected "upper" or "lower" to another element, it can be directly connected to the other element "upper" or "lower," or indirectly connected to the other element "upper" or "lower" through an intermediate element.

[0031] Laser equipment often utilizes apertures of varying sizes. The aperture determines the shape and diffraction effect of the laser beam, thus influencing the laser processing outcome. The energy distribution of the laser beam is typically Gaussian or flat-topped. If the laser beam axis shifts from the aperture center, the shape and energy distribution of the beam after passing through the aperture will be affected, resulting in a deviation from the expected processing effect. Due to manufacturing and assembly precision errors, this shift between the laser beam axis and the aperture center can easily occur. (Refer to...) Figure 9 and Figure 10 As shown, Figure 9 This is a pattern of the laser beam after passing through the aperture in the aperture disk provided in this embodiment. Figure 9 The laser beam is coaxial with the aperture. Figure 10 This is a pattern of the laser beam after passing through an aperture using existing technology. Figure 10 The laser beam and the aperture are not coaxial.

[0032] For example, during the fabrication of the aperture aperture 101 on the aperture disk 100, due to manufacturing errors, the aperture aperture 101 will not be precisely located on the theoretical aperture distribution circle A. The actual aperture position B may differ slightly from the theoretical aperture position C. This will cause the center of the aperture aperture 101 to be out of axis from the laser beam center. (Refer to...) Figure 1 As shown, Figure 1 This is a front view of an existing aperture disk. However, after the aperture disk 100 is installed, due to manufacturing errors, the actual center of the aperture disk may not coincide with the theoretical center. This can cause the center of the aperture aperture to be out of axis from the center of the laser beam. (Refer to...) Figure 2 As shown, Figure 2 A schematic diagram of the existing aperture plate mounting structure.

[0033] To improve the laser processing effect, ensuring that the axis of the laser beam passes through the center of the aperture is an indispensable step in laser processing. However, it is often difficult to meet such high requirements in the production and assembly process. This requires finding a reliable method to offset the precision errors caused by production and assembly, so as to solve the problem that the axis of the laser beam is not aligned with the axis of the aperture when the laser beam passes through the aperture.

[0034] Reference Figures 3 to 6 As shown, Figure 3 This is a perspective view of the laser spot adjustment device provided in the embodiments of this application. Figure 4 This is a front view of the laser spot adjustment device provided in the embodiments of this application. Figure 5 This is a side view of the laser spot adjustment device provided in an embodiment of this application. Figure 6This is a top view of a laser spot adjustment device provided in an embodiment of this application. The embodiment of this application discloses a laser spot adjustment device, which includes a displacement adjustment component 1, a motor 2, an aperture plate 3, a mounting base 4, and a control mechanism (not shown in the figure). The displacement adjustment component 1 is disposed on the laser device, the mounting base 4 is disposed on the displacement adjustment component 1, the motor 2 is disposed on the mounting base 4, and the aperture plate 3 is connected to the output shaft of the motor 2, so that the displacement adjustment component 1 can drive the aperture plate 3 to move linearly, and the motor 2 can drive the aperture plate 3 to rotate. The control mechanism is electrically connected to the displacement adjustment component 1 and the motor 2, and stores the encoder position value corresponding to the first aperture plate. When adjusting the spot of the laser beam emitted by the laser device, the control mechanism adjusts the rotation angle of the motor 2 and the displacement of the displacement adjustment component 1 based on the encoder position value, so that the position of the target aperture light-passing hole of the corresponding aperture plate 3 corresponds to the position of the laser beam emitted by the laser device, that is, so that the axis of the laser beam emitted by the laser device passes through the center of the target aperture light-passing hole. Among them, the target aperture refers to the aperture used to adjust the spot of the laser beam emitted by the laser device. The aperture disk 3 is not directional, and either side can be the light-entry side.

[0035] Specifically, the encoder position value corresponding to the first aperture disk includes the motor rotation angle value and the displacement value of the displacement adjustment component. Using tools such as a spot analyzer, the light spot passing through the aperture aperture 31 is observed. After confirming the spot offset, the rotation angle of the motor 2 is adjusted to align the used aperture aperture 31 with the light spot position. Then, the position of the slide of the displacement adjustment component 1 is adjusted to make the used aperture aperture 31 coincide with the light spot position. These adjustment steps can be repeated multiple times to achieve the desired effect. After adjusting one aperture aperture 31, the motor 2 rotates by one angle to the next aperture aperture 31, and the position of the second aperture aperture 31 is fine-tuned in the same way until the second aperture aperture 31 coincides with the light spot. This process is repeated until all aperture apertures 31 are adjusted. The motor rotation angle value and displacement value of the displacement adjustment component corresponding to each aperture aperture 31 are recorded to obtain the encoder position value corresponding to each aperture aperture 31. When using any aperture 31, simply input the encoder position value corresponding to different aperture 31, and the corresponding aperture 31 can be adjusted to coincide with the light spot. This allows for automatic coaxial adjustment of the laser beam axis and the aperture 31 axis for any type of aperture disk 3, thus offsetting the precision errors caused by production and assembly.

[0036] Continue to refer to Figure 4As shown, the aperture disk 3 is circular and has multiple aperture through-holes 31. These aperture through-holes 31 are evenly spaced along the circumference of the aperture disk 3, and each aperture through-hole 31 corresponds to a set of encoder position values. When a laser beam illuminates an aperture through-hole 31 on the aperture disk 3, the rotation angle of the motor 2 can be adjusted to switch between different aperture through-holes 31 to adjust the spot size of the laser beam. Specifically, when it is necessary to use a specific aperture through-hole (target aperture through-hole) to adjust the laser beam emitted by the laser device, the control mechanism drives the motor 2 to rotate a certain angle based on the motor rotation angle value in the encoder position value corresponding to that aperture through-hole 31. Then, based on the displacement value of the displacement adjustment component in the encoder position value corresponding to that aperture through-hole 31, the control mechanism drives the displacement adjustment component 1 to move a certain distance, so that the aperture through-hole 31 is in a suitable position, thereby allowing the axis of the laser beam emitted by the laser device to pass through the center of the aperture through-hole 31.

[0037] Furthermore, the displacement adjustment assembly 1 includes a fixed base, a driving component, and a slide table. The fixed base is mounted on the laser equipment, the slide table is slidably connected to the fixed base, and the mounting base 4 is mounted on the slide table. The driving component is disposed on the fixed base and connected to the slide table, so that the slide table moves via the driving component, thereby driving the mounting base 4 and the motor 2 to move. The driving component can be a linear motor or a cylinder.

[0038] Reference Figure 7 As shown, Figure 7 This is an exploded perspective view of the laser spot adjustment device provided in the embodiment of this application. The mounting base 4 includes a fixing part 41 and a mounting part 42, which are connected to the fixing part 41 to form an L-shaped structure. The fixing part 41 is connected to the slide of the displacement adjustment assembly 1 by screws 5. The mounting part 42 is provided with a mounting hole. The motor 2 is mounted on the mounting part 42 by screws 5, and the output shaft of the motor 2 passes through the mounting hole 421.

[0039] In this embodiment, the slide moves horizontally. In some embodiments, the slide can also move vertically or in other directions. Simultaneously, the light spot position can also be at other positions on the aperture plate 3; fine-tuning can also be achieved by moving the slide in other directions. In other embodiments, the displacement adjustment component 1 may also include two electrically driven translation slides. The motor 2 rotates only by a fixed angle, and the overlap of the light spot and the aperture through the hole is achieved by changing the positions of the two electrically driven translation slides. For example, a combination of a horizontally driven translation slide and a vertically driven translation slide, or a slide that can move simultaneously in both the horizontal and vertical directions.

[0040] This application achieves coaxiality between the aperture 31 and the laser beam by combining translation and rotation directions. Furthermore, by recording the translation and rotation positions corresponding to each aperture 31, when using different apertures 31, it is only necessary to retrieve the translation and rotation positions corresponding to different apertures 31 to ensure that each aperture 31 is precisely kept coaxial with the laser beam.

[0041] Accordingly, embodiments of this application also provide a laser processing device, which includes a laser and a laser spot adjustment device as described in any of the above embodiments. The laser is used to emit a laser beam, and the laser spot adjustment device is used to adjust the spot shape and diffraction effect of the laser beam emitted by the laser. The laser beam adjusted by the laser spot adjustment device is used to process circuit boards, such as drilling or cutting circuit boards.

[0042] Correspondingly, refer to Figure 8 As shown, Figure 8 A flowchart illustrating a laser spot adjustment method provided in an embodiment of this application. An embodiment of this application also discloses a laser spot adjustment method applied to the laser spot adjustment device described in the above embodiments, the laser spot adjustment method comprising the following steps: S11. Obtain the encoder position value corresponding to each aperture.

[0043] Specifically, when the laser beam passes through each aperture 31 in sequence, if the laser beam spot shifts, the rotation angle of the motor 2 and the displacement of the displacement adjustment component 1 are adjusted to make the center of the laser beam coaxial with the center of the aperture 31. The rotation angle value of the motor 2 and the displacement value of the displacement adjustment component 1 are then recorded as the encoder position value of the aperture 31. If the laser beam spot does not shift, the rotation angle value of the motor 2 and the displacement value of the displacement adjustment component 1 are directly recorded as the encoder position value of the aperture 31.

[0044] Furthermore, when the laser beam spot shifts, the rotation angle of motor 2 is first adjusted so that the height of the target aperture is consistent with the height of the laser beam spot. Then, the displacement of displacement adjustment component 1 is adjusted so that the center of the target aperture is coaxial with the axis of the laser beam.

[0045] S12. Determine the target aperture.

[0046] The target aperture is a light-passing aperture used to adjust the spot of the laser beam emitted by a laser device.

[0047] S13. Obtain the encoder position value corresponding to the target aperture.

[0048] Specifically, the encoder position values ​​include the motor rotation angle value and the displacement adjustment component displacement value. Each aperture corresponds to a set of motor rotation angle values ​​and displacement adjustment component displacement values. Obtaining the encoder position value corresponding to the target aperture means obtaining the motor rotation angle value and displacement adjustment component displacement value corresponding to the aperture being used.

[0049] S14. Adjust the rotation angle of the motor and the displacement of the displacement adjustment component based on the encoder position value so that the axis of the laser beam emitted by the laser device is coaxial with the center of the target aperture.

[0050] Specifically, the control mechanism drives the motor 2 to rotate a certain angle based on the motor rotation angle value in the encoder position value corresponding to the used aperture 31, and then drives the displacement adjustment component 1 to move a certain distance based on the displacement value of the displacement adjustment component in the encoder position value corresponding to the used aperture 31, so that the used aperture 31 is in a suitable position, thereby enabling the axis of the laser beam emitted by the laser device to pass through the center of the used aperture 31.

[0051] This application solves the problem of the aperture 31 being out of axis with the laser beam by means of translation and rotation. At the same time, it can reduce the requirements for the machining accuracy and assembly accuracy of the aperture position, save costs and manpower, and the position recording and aperture switching can be realized by software, which is convenient and fast.

[0052] The above description is merely a preferred embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for adjusting laser spot size, characterized in that, An application is made in a laser spot adjustment device, the laser spot adjustment device including a displacement adjustment component, a motor, an aperture plate and a control mechanism, wherein the motor is disposed in the displacement adjustment component; The aperture plate is connected to the output shaft of the motor, and the aperture plate is provided with multiple aperture light-passing holes; The control mechanism is electrically connected to the displacement adjustment component and the motor respectively, and the control mechanism stores the encoder position value corresponding to each light-transmitting hole of the aperture disk. The control mechanism is used to adjust the rotation angle of the motor and the displacement of the displacement adjustment component based on the encoder position value, so that the center of the target light-transmitting hole of the aperture disk is coaxial with the axis of the laser beam emitted by the laser device. The encoder position values ​​include the motor rotation angle value and the displacement value of the displacement adjustment component, and each of the light apertures corresponds to a set of encoder position values; The laser spot adjustment method includes: Obtain the encoder position values ​​corresponding to each aperture; Determine the target aperture; Obtain the encoder position value corresponding to the target aperture; The rotation angle of the motor and the displacement of the displacement adjustment component are adjusted based on the encoder position value so that the axis of the laser beam emitted by the laser device is coaxial with the center of the target aperture. The step of obtaining the encoder position value corresponding to each aperture includes: As the laser beam passes through each aperture in sequence... If the laser beam spot shifts, adjust the rotation angle of the motor and the displacement of the displacement adjustment component to make the laser beam coaxial with the aperture. Then record the rotation angle value of the motor and the displacement value of the displacement adjustment component as the encoder position value of the aperture. If the laser beam spot does not shift, record the rotation angle of the motor and the displacement value of the displacement adjustment component as the encoder position value of the aperture.

2. The laser spot adjustment method according to claim 1, characterized in that, The aperture disk is circular in shape, and a plurality of aperture holes are distributed at intervals along the circumference of the aperture disk.

3. The laser spot adjustment method according to any one of claims 1 to 2, characterized in that, The laser spot adjustment device also includes a mounting base, which is mounted on the displacement adjustment assembly, and the motor is mounted on the mounting base.

4. The laser spot adjustment method according to claim 3, characterized in that, The displacement adjustment assembly includes a fixed base, a driving component, and a slide. The slide is slidably connected to the fixed base, the mounting base is installed on the slide, the driving component is disposed on the fixed base and connected to the slide, and the driving component is used to drive the slide to move.

5. The laser spot adjustment method according to claim 4, characterized in that, The slide moves horizontally and / or vertically.

6. The laser spot adjustment method according to claim 4, characterized in that, The mounting base is installed on the slide table by screws; and / or The motor is mounted to the mounting base by screws.

7. The laser spot adjustment method according to claim 1, characterized in that, The adjustment of the rotation angle of the motor and the displacement of the displacement adjustment component include: Adjust the rotation angle of the motor so that the height of the target aperture is consistent with the height of the laser beam spot; Adjust the displacement of the displacement adjustment component so that the center of the target aperture is coaxial with the axis of the laser beam.

8. A laser processing device, characterized in that, The device includes a laser and a laser beam adjustment device. The laser is used to emit a laser beam, and the laser beam adjustment device uses the laser beam adjustment method as described in any one of claims 1 to 7 to adjust the beam shape and diffraction effect of the laser beam emitted by the laser. The adjusted laser beam is used to process circuit boards.

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