CN222660430U - A calibration device for laser galvanometer of laser marking machine - Google Patents
A calibration device for laser galvanometer of laser marking machine Download PDFInfo
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- CN222660430U CN222660430U CN202420603904.2U CN202420603904U CN222660430U CN 222660430 U CN222660430 U CN 222660430U CN 202420603904 U CN202420603904 U CN 202420603904U CN 222660430 U CN222660430 U CN 222660430U
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Abstract
The utility model discloses a correction device for a laser vibrating mirror of a laser marking machine, which comprises a main installation component, wherein a vertical installation component is arranged on the main installation component, a focusing adjustment control component is arranged on the vertical installation component, a laser generating component is arranged at the moving part of the focusing adjustment control component, a laser vibrating mirror is arranged at the output end of the laser generating component, a calibration component is arranged below the laser vibrating mirror on the main installation component, an auxiliary support is arranged on the laser vibrating mirror, and a drawing component is arranged on the auxiliary support. The utility model not only solves the problem of error input and time consumption in the traditional correction mode, but also has the advantages of high-precision measuring equipment in the aspect of precision, and avoids the problem of complexity caused by manually inputting data in the measurement of the high-precision equipment.
Description
Technical Field
The utility model relates to the technical field of laser galvanometer correction, in particular to a laser galvanometer correction device of a laser marking machine.
Background
The laser marking machine galvanometer adopts the working principle that laser beams are incident on two reflecting mirrors (scanning mirrors), the reflecting angles of the reflecting mirrors are controlled by a computer, the two reflecting mirrors can be scanned along X, Y axes respectively, so that the deflection of the laser beams is achieved, a laser focusing point with certain power density moves on marking materials according to the required requirements, so that permanent marks are left on the surfaces of the materials, the laser scanner is also called as a laser galvanometer, the laser scanner consists of an X-Y optical scanning head, an electronic driving amplifier and an optical reflecting lens, and a signal provided by a computer controller drives the optical scanning head through a driving amplifying circuit, so that the deflection of the laser beams is controlled on an X-Y plane.
The BOX correction of the industrial laser marking machine usually corrects the position of a laser coordinate system, after correction, the laser marking position is consistent with the actual physical coordinate position, a ruler or vernier caliper is generally adopted to measure the relative physical distance of four corners of a laser marking rectangular frame, under the condition of high precision requirement, three-dimensional equipment is adopted to measure the relative physical distance of the four corners of the laser marking rectangular frame, and then the measurement result is input into the laser marking system for correcting the laser marking coordinate system.
In summary, the correction method has the following problems that 1, the correction method is time-consuming and labor-consuming, after the relative physical distance of the correction points is measured, the position coordinates of each point are required to be manually input, and the correction method is very complicated, 2, human errors often occur in the process of inputting numbers, and are difficult for operators, 3, the precision and the high cost are problems, and when the correction method is manually measured, the visual errors caused by the limitation of human eyes are caused, and when the measurement is performed by using a high-precision three-dimensional measuring instrument, the purchase cost of the instrument is self-evident.
Disclosure of utility model
The utility model aims to solve the problems and designs a correction device for a laser galvanometer of a laser marking machine.
The technical scheme includes that the correction device for the laser vibrating mirror of the laser marking machine comprises a main installation component, wherein a vertical installation component is arranged on the main installation component, a focusing adjustment control component is arranged on the vertical installation component, a laser generating component is arranged at a moving part of the focusing adjustment control component, a laser vibrating mirror is arranged at an output end of the laser generating component, a calibration component is arranged below the laser vibrating mirror on the main installation component, an auxiliary support is arranged on the laser vibrating mirror, and a drawing component is arranged on the auxiliary support.
As a further description of the technical solution, the main mounting assembly includes a main mounting base plate, and a vertical mounting assembly is disposed on the main mounting base plate.
As a further description of the technical scheme, the vertical mounting assembly comprises a vertical mounting plate arranged on the main mounting assembly, and a focusing adjustment control assembly is arranged on the vertical mounting plate.
As a further description of the technical scheme, the focusing adjustment control assembly comprises a focusing adjustment control lifting module arranged on the vertical installation assembly, and a laser generation assembly is arranged at the moving part of the focusing adjustment control lifting module.
As a further description of the technical scheme, the laser generating assembly comprises a laser generator arranged at the moving part of the focusing adjustment control assembly, and a laser vibrating mirror is arranged at the output end of the laser generator.
As a further description of the technical scheme, the calibration assembly comprises a calibration plate arranged on the main installation assembly and located below the laser galvanometer, and the image capturing assembly comprises a shooting camera arranged on the auxiliary support.
A correction method of a laser galvanometer of a laser marking machine comprises the following steps:
the method comprises the steps of firstly, installing an industrial camera (1200 ten thousand pixels) on a bracket, and adjusting the definition of a picture shot by a camera lens (12 mm) through a focusing adjustment control component by utilizing camera picture taking software to make the display picture the clearest, namely, on the shooting focal length of the camera;
Placing a vision correction standard calibration plate (for example, a 7*7 round calibration plate with the diameter of the round dots being 7.5mm, the distance of the round dots being 15mm and the precision being 0.01 mm) under the industrial camera, moving the calibration plate, observing the position of the calibration plate in the visual field of the image, enabling the calibration plate to be at the right central position of the image and enabling all round dots on the calibration plate to be in the visual field range, and finely adjusting the focal length of the camera, so that the graph features in the calibration plate are the clearest;
Shooting a calibration plate image, identifying all graphs in the calibration plate by using a visual algorithm, and calculating the pixel coordinate values of the central points of all graphs;
The fourth step, a fiber laser marking system platform commonly used in an industrial laser marking system is installed, a piece of paper capable of being marked on the fiber laser marking system platform is utilized, and the marking focal length is adjusted by utilizing the marking effect presented on the paper, so that the marking effect is optimal;
Creating a dot matrix image file with the diameter of 7*7 dots being 7.5mm and the distance of the dots being 15mm, and marking the dot matrix on marking paper by using a marking system;
Step six, placing the marking paper with the marking dot matrix under a camera, shooting pictures, and identifying dots on the marking paper;
The method comprises the steps of shooting a picture of a laser marking point by a camera, identifying pixel coordinates of the laser marking feature point, knowing the laser coordinates of the laser marking point, establishing a relation R2 between the pixel coordinates and a laser coordinate system, obtaining a physical coordinate system relation R3 between the laser coordinate system and a calibration plate according to the two coordinate relations of R1 and R2, inputting R3 into a laser marking system to finish laser BOX region correction, eliminating the complicated step of manually inputting the point, avoiding the tiny distance difference which cannot be distinguished by naked eyes, and finishing laser BOX correction with high efficiency.
In the third step, the center graph of the calibration plate, for example, a circular calibration plate, the circle center of a round dot is the origin of coordinates, the center of a center row of round dots is the right direction of the X axis, the center of a center row of round dots is the upward direction of the Y axis, the physical coordinates of the circle center of each round dot of the calibration plate can be obtained by labeling the dimensions on the calibration plate, and the conversion relationship R1 from the pixel coordinate system of the camera to the physical coordinate system of the calibration plate is calculated according to the physical coordinates corresponding to the center coordinates of each graph of the calibration plate.
In the sixth step, the pixel coordinates of the circle centers of the dots on the marking paper are calculated by using a visual algorithm, the centers of the dots in the middle row are fitted into a straight line by using a least square method, the distance between each dot and the straight line is calculated, if the distance is larger than a certain set value (the set value is set by referring to the precision required by a customer), the corresponding axis precision of the vibrating mirror system is judged to be insufficient, the circle centers of the middle dots in the middle row are used for making a perpendicular line of the fitted straight line, the distance between the circle centers of the middle row of dots and the perpendicular line is calculated, if the distance is larger than a certain set value (the set value is set by referring to the precision required by the customer), the corresponding axis precision of the vibrating mirror system is judged to be insufficient, or the X-axis Y-axis verticality precision of the vibrating mirror system is not sufficient, and according to the mode, the control precision of the vibrating mirror system of the laser can be assisted to judge whether the control precision of the vibrating mirror system reaches the standard or not, and the defective marking products caused by the problem of the vibrating mirror system of the laser is reduced.
As a further description of the present technical solution, let the physical coordinate matrix of the calibration plate be S [ Xs Ys ], the camera pixel coordinate matrix be P [ Xp Yp ], the laser coordinate matrix be L [ xlyl ], the pixel coordinate matrix corresponding to the laser dotting be M [ Xm Ym ], the affine transformation of the spatial coordinate transformation is generally as follows:
Wherein T is a transformation matrix, s=p is a transformation matrix obtained by converting a pixel coordinate space into a physical coordinate space according to the affine transformation, and is obtained by calculating the equation s=p, thereby obtaining a physical coordinate matrix M for laser dotting, and likewise m=l is a transformation matrix obtained by converting a laser coordinate space into a coordinate of a physical coordinate, and is also obtained by calculating a transformation matrix according to a physical coordinate of any point coordinate in the laser coordinate space.
The method has the advantages that the method not only solves the problem of error input and time consumption in the traditional correction mode, but also has the advantages of high-precision measuring equipment in the aspect of precision, and avoids the problem of complexity caused by manual data input in the measurement of the high-precision equipment.
The invention adopts the industrial camera to match with the standard calibration plate as an aid, and further carries out quick and accurate correction on the laser scanning galvanometer by means of the high-precision characteristic of the calibration plate.
Drawings
FIG. 1 is a schematic diagram of the overall structure of a correction device of the present utility model;
FIG. 2 is a schematic diagram of the whole structure of another view angle of the calibration device of the present utility model.
In the figure, 1, a main mounting assembly; 2, a vertical installation component; 3, a focusing adjustment control component; the device comprises a laser generating component, a laser vibrating mirror, a calibration component, an auxiliary bracket, a drawing component, a main mounting base plate, a vertical mounting plate, a focusing adjustment control lifting module, a laser generator, a laser vibrating mirror, a calibration plate, a shooting camera and a shooting camera, wherein the laser vibrating mirror comprises a main mounting base plate, a vertical mounting plate, a focusing adjustment control lifting module, a laser generator, a laser vibrating mirror, a calibration component, an auxiliary bracket, a drawing taking component, a main mounting base plate, a laser vibrating mirror, a calibration camera and a shooting camera.
Detailed Description
The utility model will be described in detail with reference to the accompanying drawings, and as shown in fig. 1-2, a correction device for a laser galvanometer of a laser marking machine comprises a main mounting assembly 1, and the main mounting assembly 1 will be described in detail, wherein the main mounting assembly 1 comprises a main mounting base plate 9, and a vertical mounting assembly 2 is arranged on the main mounting base plate 9.
In order to facilitate the installation of the focus adjustment control assembly 3, the main installation assembly 1 is provided with a vertical installation assembly 2, and the vertical installation assembly 2 will be described in detail below, the vertical installation assembly 2 includes a vertical installation plate 10 provided on the main installation assembly 1, and the focus adjustment control assembly 3 is provided on the vertical installation plate 10.
In order to facilitate the focus adjustment of the industrial camera, a focus adjustment control assembly 3 is provided on the vertical mounting assembly 2, and the focus adjustment control assembly 3 will be described in detail below, the focus adjustment control assembly 3 includes a focus adjustment control lifting module 11 provided on the vertical mounting assembly 2, and a laser generating assembly 4 is provided at a moving part of the focus adjustment control lifting module 11.
The laser generation assembly 4 is arranged at the moving part of the focusing adjustment control assembly 3, the laser generation assembly 4 comprises a laser generator 12 arranged at the moving part of the focusing adjustment control assembly 3, and a laser galvanometer 5 is arranged at the output end of the laser generator 12.
The output end of the laser generating component 4 is provided with a laser galvanometer 5, and in order to facilitate correction of the laser galvanometer 5, a calibration component 6 is arranged below the laser galvanometer 5 on the main mounting component 1, and the calibration component 6 will be described in detail below, and the calibration component 6 includes a calibration plate 13 arranged below the laser galvanometer 5 on the main mounting component 1.
For the convenience of installing the drawing component 8, an auxiliary support 7 is arranged on the laser galvanometer 5, for the convenience of photographing and recording, the drawing component 8 is arranged on the auxiliary support 7, and the drawing component 8 is described in detail below, and the drawing component 8 comprises a photographing camera 14 arranged on the auxiliary support 7.
The correction device is described in detail above, and the correction method of the laser galvanometer 5 of the laser marking machine is described in detail below, and includes the following steps:
The method comprises the steps of firstly, installing an industrial camera (1200 ten thousand pixels) on a bracket, and adjusting the definition of a picture shot by a camera lens (12 mm) through a focusing adjustment control component 3 by utilizing camera picture taking software to enable a display picture to be the clearest, namely, on a camera shooting focal length;
Placing a vision correction standard calibration plate 13 (for example, a 7*7 round calibration plate 13 with the diameter of the round dots being 7.5mm, the space of the round dots being 15mm and the precision being 0.01 mm) under an industrial camera, moving the calibration plate 13, observing the position of the calibration plate in an image view field, enabling the calibration plate to be at the right central position of the image and all round dots on the calibration plate 13 to be in the view field range, finely adjusting the focal length of the camera, and enabling the graphic features in the calibration plate 13 to be the clearest;
In the third step, the center graph of the calibration plate 13, such as a round calibration plate 13, the circle center of a round dot is taken as the origin of coordinates, the center of a middle row of round dots is taken as the right direction of the X axis, the center of a middle column of round dots is taken as the upward direction of the Y axis, and the physical coordinates of the center of each round dot of the calibration plate 13 can be obtained by labeling the size on the calibration plate 13;
The fourth step, a fiber laser marking system platform commonly used in an industrial laser marking system is installed, a piece of paper capable of being marked on the fiber laser marking system platform is utilized, and the marking focal length is adjusted by utilizing the marking effect presented on the paper, so that the marking effect is optimal;
Creating a dot matrix image file with the diameter of 7*7 dots being 7.5mm and the distance of the dots being 15mm, and marking the dot matrix on marking paper by using a marking system;
The method comprises the steps of setting marking paper of a marking dot matrix under a camera, shooting pictures, and identifying dots on the marking paper, wherein in the step six, a visual algorithm is utilized to calculate pixel coordinates of circle centers of all dots on the marking paper, a least square method is utilized to fit all dot centers of a middle row into a straight line, if the distance between each dot and the straight line is calculated to be larger than a certain set value (the set value is set by referring to the precision required by a customer), the fact that the corresponding axis precision of the vibrating mirror system is insufficient is calculated, the circle centers of all dots in the middle row are used for making perpendicular lines of the fit straight line, and if the distance between the circle centers of all dots in the middle row and the perpendicular line is larger than a certain set value (the set value is set by referring to the precision required by the customer), the fact that the corresponding axis precision of the vibrating mirror system is insufficient or the X-axis Y-axis verticality precision of the vibrating mirror system is insufficient is judged;
The method comprises the steps of shooting a picture of a laser marking point by a camera, identifying pixel coordinates of the laser marking feature point, knowing the laser coordinates of the laser marking point, establishing a relation R2 between the pixel coordinates and a laser coordinate system, obtaining a physical coordinate system relation R3 between the laser coordinate system and a calibration plate 13 according to the two coordinate relations of R1 and R2, inputting R3 into the laser marking system to finish laser BOX region correction, eliminating the complicated step of manually inputting the point, avoiding micro-distance difference indistinguishable by naked eyes, and finishing laser BOX correction with high efficiency.
The physical coordinate matrix of the calibration plate 13 is S [ Xs Ys ], the camera pixel coordinate matrix is P [ Xp Yp ], the laser coordinate matrix is L [ xlyl ], the pixel coordinate matrix corresponding to laser dotting is M [ Xm Ym ], and affine transformation of the spatial coordinate transformation is generally as follows:
Wherein T is a transformation matrix, s=p is a transformation matrix obtained by converting a pixel coordinate space into a physical coordinate space according to the affine transformation, and is obtained by calculating the equation s=p, thereby obtaining a physical coordinate matrix M for laser dotting, and likewise m=l is a transformation matrix obtained by converting a laser coordinate space into a coordinate of a physical coordinate, and is also obtained by calculating a transformation matrix according to a physical coordinate of any point coordinate in the laser coordinate space.
The method can be extended into a marking system with a paraxial installation aiming at the marking range of the vibrating mirror and the visual field range of the camera under the same visual field, namely, the camera is installed outside a marking system platform, and the marking system with the paraxial installation mode comprises the following specific steps (the first six steps are similar to the above method):
And A, installing an industrial camera (1200 ten thousand pixels) on a bracket, and adjusting the definition of a picture shot by a camera lens (12 mm) by using camera image taking software to make the display picture the clearest, namely, on the shooting focal length of the camera.
And B, placing a vision correction standard calibration plate (for example, a 7*7 dot diameter 7.5mm dot spacing 15mm precision 0.01mm round calibration plate) under the industrial camera, moving the calibration plate, observing the position of the calibration plate in the image field of view, enabling the calibration plate to be at the right central position of the image and enabling all dots on the calibration plate to be in the field of view, and finely adjusting the focal length of the camera to enable the graphic features in the calibration plate to be the clearest.
And C, shooting an image of the calibration plate, identifying all the images in the calibration plate by using a visual algorithm, calculating the pixel coordinate values of the central points of all the images, and marking the physical coordinates of the circle centers of each dot of the calibration plate by using the central image of the calibration plate, such as a circular calibration plate, wherein the circle centers of the dots are the origin of coordinates, the circle centers of a middle row of dots are the right direction in the X-axis direction, the circle centers of a middle column of dots are the upward direction in the Y-axis direction, and the physical coordinates of the circle centers of each dot of the calibration plate can be obtained by marking the dimensions on the calibration plate. And calculating a conversion relation R1 from the pixel coordinate system of the camera to the physical coordinate system of the calibration plate according to the physical coordinates corresponding to the central coordinates of each graph of the calibration plate.
And D, installing a fiber laser marking system platform commonly used in an industrial laser marking system. The paper capable of being marked on the paper is utilized, and the marking focal length is adjusted by utilizing the marking effect displayed on the paper, so that the marking effect is optimal.
And E, creating a dot matrix image file with the diameter of 7*7 dots being 7.5mm and the distance of the dots being 15mm, and marking the dot matrix on marking paper by using a marking system.
And F, placing the marking paper marked with the dot matrix under a camera, shooting a picture, identifying dots on the marking paper, and calculating the pixel coordinates of the circle centers of all the dots on the marking paper by using a visual algorithm. And (3) fitting the centers of all the dots in the middle row into a straight line by using a least square method, calculating the distance between each dot and the straight line, and judging that the galvanometer system in the laser marking system has a problem if the distance is more than 0.02 mm. And (3) making a perpendicular line of the fitting straight line by using the center of the center circle of the middle row, calculating the distance between the center circle of the line of the fitting straight line, and judging that the galvanometer system in the laser marking system has a problem if the distance is more than 0.02 mm. According to the method, whether the laser galvanometer system has problems or not can be judged in an auxiliary mode, and defective products of marking products caused by the problems of the laser galvanometer system are reduced.
And G, calculating a rotation angle A of a straight line according to the straight line fitted by the center of the middle row of dots obtained in the step six, enabling the physical coordinate system rotation established in the step three to be parallel to the X axis and the fitted straight line, and translating the origin of the physical coordinate system to the center of the middle row of dots in the step six. Through rotation and translation, the physical coordinate system is consistent with the laser coordinate system. Let the conversion relationship of this rotation and translation be R4.
And H, shooting a picture of the laser dotting point by a camera, identifying the pixel coordinate of the laser dotting feature point, knowing the laser coordinate of the laser dotting point, and establishing a relation R2 between the pixel coordinate and a laser coordinate system. According to the two coordinate relations of R1 and R2, the physical coordinate relation R3 of the laser coordinate system and the calibration plate can be obtained. And then, inputting the central coordinates of each dot of the dot matrix obtained according to the R3 and the R4 into a laser marking system to finish the correction of the vibrating mirror BOX area of the paraxial laser marking system.
The invention not only solves the problem of error input and time consumption in the traditional correction mode, but also has the advantages of high-precision measurement equipment in precision, and avoids the problem of complexity caused by manual data input in the measurement of the high-precision equipment.
The invention adopts the industrial camera to match with the standard calibration plate as an aid, and further carries out quick and accurate correction on the laser scanning galvanometer by means of the high-precision characteristic of the calibration plate.
The above technical solution only represents the preferred technical solution of the present utility model, and some changes that may be made by those skilled in the art to some parts of the technical solution represent the principles of the present utility model, and the technical solution falls within the scope of the present utility model.
Claims (6)
1. The utility model provides a correcting unit of laser marking machine laser galvanometer, its characterized in that, including main installation component (1), be provided with vertical installation component (2) on main installation component (1), be provided with focus adjustment control assembly (3) on vertical installation component (2), the removal position of focus adjustment control assembly (3) is provided with laser generation subassembly (4), the output of laser generation subassembly (4) is provided with laser galvanometer (5), be located laser galvanometer (5) below on main installation component (1) and be provided with demarcation subassembly (6), be provided with auxiliary stand (7) on laser galvanometer (5), be provided with on auxiliary stand (7) and get picture subassembly (8).
2. The correction device for the laser galvanometer of the laser marking machine according to claim 1, wherein the main mounting assembly (1) comprises a main mounting base plate (9), and the main mounting base plate (9) is provided with a vertical mounting assembly (2).
3. The correction device for the laser galvanometer of the laser marking machine according to claim 1, wherein the vertical mounting assembly (2) comprises a vertical mounting plate (10) arranged on the main mounting assembly (1), and a focusing adjustment control assembly (3) is arranged on the vertical mounting plate (10).
4. The correction device for the laser galvanometer of the laser marking machine according to claim 1, wherein the focusing adjustment control assembly (3) comprises a focusing adjustment control lifting module (11) arranged on the vertical installation assembly (2), and a laser generation assembly (4) is arranged at a moving part of the focusing adjustment control lifting module (11).
5. The correction device for the laser galvanometer of the laser marking machine according to claim 1, wherein the laser generating assembly (4) comprises a laser generator (12) arranged at a moving part of the focusing adjustment control assembly (3), and a laser galvanometer (5) is arranged at an output end of the laser generator (12).
6. The correction device for the laser galvanometer of the laser marking machine according to claim 1, characterized in that the calibration assembly (6) comprises a calibration plate (13) arranged on the main installation assembly (1) and positioned below the laser galvanometer (5), and the image taking assembly (8) comprises a shooting camera (14) arranged on the auxiliary bracket (7).
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| Application Number | Priority Date | Filing Date | Title |
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| CN202420603904.2U CN222660430U (en) | 2024-03-27 | 2024-03-27 | A calibration device for laser galvanometer of laser marking machine |
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| CN202420603904.2U CN222660430U (en) | 2024-03-27 | 2024-03-27 | A calibration device for laser galvanometer of laser marking machine |
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