A laser imaging control method, system and related devices

Abstract

Embodiments of the present application provide a laser imaging control method, system and related device, which are used to improve the precision of laser imaging. The method of the embodiments of the present application comprises: controlling a light-emitting array to perform preset pattern exposure on a heat-sensitive material region on a workpiece table in at least three position regions in a second coordinate system according to a position guide in the second coordinate system, so as to form at least three preset patterns in the heat-sensitive material region; recording coordinates T of feature points of the at least three preset patterns in the second coordinate system i ; identifying feature points D i in the at least three preset patterns in a first coordinate system by using a CCD camera; calculating a mapping relationship of points in the first coordinate system in the second coordinate system according to D i and T i ; mapping coordinates of pixel exposure points in an exposure region on the workpiece table to the second coordinate system according to the mapping relationship; and controlling the light-emitting array to perform exposure on the pixel exposure points in the exposure region on the workpiece table according to the position in the second coordinate system.

Description

Technical Field

[0001] This application relates to the field of laser imaging technology, and in particular to a laser imaging control method, system and related equipment. Background Technology

[0002] The principle of laser imaging technology is to control the laser to scan and expose the photosensitive coating on the exposure area, then develop the exposed photosensitive coating to generate the desired developed image on the exposure area. Compared with traditional processes, laser imaging technology reduces process complexity and saves production costs, and can be applied to fields such as screen printing plate making, PCB pattern transfer, and photolithography machines.

[0003] like Figure 1 The laser imaging device shown includes a laser array 1 and a workpiece stage 2. In the laser imaging process, the workpiece stage 2 needs to be moved to the opposite side (e.g., directly below) of the laser array 1's light emission direction to achieve selective scanning exposure of the photosensitive coating area on the workpiece stage 2. To achieve precise positioning of the laser scanning position on the photosensitive coating area on the workpiece stage, the laser array is set to move in both the horizontal guide rail 3 direction and the vertical guide rail direction (not shown, perpendicular to the horizontal guide rail 3), while the workpiece stage moves vertically. Before each laser scanning exposure, a specialized instrument is used to measure and reset the laser and workpiece stage to a preset initial position. A relative positional relationship between the two is pre-established based on their preset initial positions, and this relative positional relationship is consistently used to calculate the pixel position on the workpiece stage.

[0004] The applicant noted that due to environmental factors (such as temperature changes, mechanical wear, and mechanical vibration), the workpiece stage may deform or shift, causing changes in the relative position between the laser and the workpiece stage. Determining the scannable position of the laser on the workpiece stage based on a pre-set mapping between the laser's displacement position and the initial position of the workpiece stage results in a deviation between the actual and theoretical scanning positions. This leads to inaccurate laser positioning on the workpiece stage, thus affecting the accuracy of laser imaging. Ensuring the accuracy of laser imaging has become a pressing issue. Summary of the Invention

[0005] This application provides a laser imaging control method, system, and related equipment to improve the accuracy of laser imaging.

[0006] A first aspect of this application provides a laser imaging control method applied to a laser imaging device, the laser imaging device including a light-emitting array, a CCD camera, and a workpiece stage, and may include:

[0007] controlling the light-out array to direct the preset pattern exposure on the heat-sensitive material region on the workpiece table according to the positions in the second coordinate system, to form at least three preset patterns on the heat-sensitive material region;

[0008] recording the coordinate points T of the feature points of the at least three preset patterns in the second coordinate system i ;

[0009] recognizing the feature points D of the at least three preset patterns by the CCD camera i in the first coordinate system, the first coordinate system and the second coordinate system are located in the same plane or in parallel planes;

[0010] calculating the mapping relationship between the first coordinate system and the second coordinate system according to the D i , T i , and mapping the coordinates of the pixel exposure points in the exposure region on the workpiece table to the second coordinate system according to the mapping relationship, to control the light-out array to expose the pixel exposure points in the exposure region on the workpiece table according to the positions in the second coordinate system.

[0011] Optionally, as a possible implementation, the laser imaging control method in the embodiment of the application, according to the D i , T i calculating the mapping relationship between the first coordinate system and the second coordinate system, can include:

[0012] the D i , T i into a preset plane rectangular coordinate system mapping formula:

[0013] X T = X D *cosθ- Y D *sinθ+A0 (1)

[0014] Y T = X D *sinθ+ Y D *cosθ+B0 (2)

[0015] iteratively calculating the mapping relationship between the first coordinate system and the second coordinate system according to equations (1) and (2).

[0016] Optionally, as a possible implementation, in the embodiment of the application, the heat-sensitive material region provided on the workpiece table is formed by embedding a surface heat-sensitive material.

[0017] Optionally, as a possible implementation, in this embodiment of the application, the heat-sensitive material area provided on the workpiece stage is formed of a heat-sensitive material that can be detachably fixed to the surface.

[0018] Optionally, as a possible implementation, in this embodiment of the application, the preset graphic is a centrally symmetrical graphic.

[0019] Optionally, as one possible implementation, in this embodiment of the application, the preset pattern is a cross shape.

[0020] A second aspect of this application provides a laser imaging control system, which may include:

[0021] The first control module is used to control the light-emitting array to expose a preset pattern on the thermal material area on the workpiece stage in at least three preset position areas in the second coordinate system according to the position guidance in the preset second coordinate system, so as to form at least three preset patterns in the thermal material area.

[0022] The recording module is used to record the coordinates T of the feature points of each of the at least three preset graphics in the second coordinate system. i ;

[0023] The recognition module uses the CCD camera to identify feature points D in the at least three preset images. i The coordinates in a first coordinate system, wherein the first coordinate system and the second coordinate system are located in the same plane or in parallel planes;

[0024] The second control module is used to control the data according to the D. i T i The mapping relationship between points in the first coordinate system and the second coordinate system is calculated, and the coordinates of the pixel exposure points in the exposure area of ​​the workpiece stage are mapped to the second coordinate system according to the mapping relationship, so as to control the light output array to expose the pixel exposure points in the exposure area of ​​the workpiece stage according to the position in the second coordinate system.

[0025] Optionally, as one possible implementation, in this embodiment of the application, the second control module may include:

[0026] The computing unit is used to process the D i T i The mapping relationship between points in the first coordinate system and points in the second coordinate system is obtained by iterative calculation using a preset Cartesian coordinate system mapping formula.

[0027] A third aspect of this application provides a computer device including a processor, which executes a computer program stored in a memory to implement the steps of the first aspect and any possible implementation thereof.

[0028] A fourth aspect of this application provides a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of the first aspect and any possible implementation thereof.

[0029] As can be seen from the above technical solutions, the embodiments of this application have the following advantages:

[0030] In this embodiment, after the laser imaging device is initially run or after a certain period of operation, the light-emitting array is first controlled to expose preset patterns at at least three different positions on the thermosensitive material area set on the workpiece stage. Then, the mapping relationship between points in the first coordinate system and points in the second coordinate system is calculated using the coordinates of the feature points of each of the at least three preset patterns in both the first and second coordinate systems. Finally, the coordinates of the pixel exposure points in the exposure area on the workpiece stage are mapped to the second coordinate system according to the mapping relationship. Therefore, in this embodiment, the mapping relationship between the displacement position coordinate system of the light-emitting array in the laser imaging device and the position coordinate system of the exposure area on the workpiece stage can be periodically calibrated by coordinate system transformation. Compared with the related technology that uses relative positional relationships to convert pixel positions on the workpiece stage, this application can dynamically correct deviations caused by deformation or displacement of the workpiece stage according to the working environment, and the accuracy of laser imaging is further improved through coordinate transformation. Attached Figure Description

[0031] Figure 1 This is a schematic diagram illustrating an application scenario of a laser imaging control method according to an embodiment of this application;

[0032] Figure 2 This is a schematic diagram of one embodiment of a laser imaging control method in this application.

[0033] Figure 3 This is a schematic diagram of coordinate system transformation in a laser imaging control method according to an embodiment of this application;

[0034] Figure 4 This is a schematic diagram of one embodiment of a computer device according to the present application. Detailed Implementation

[0035] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present application, and not all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative effort should fall within the scope of protection of the present application.

[0036] In the specification, claims, and accompanying drawings of this application, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are used only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0037] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, unless otherwise stated, "a plurality of" means two or more. Unless otherwise expressly specified and limited, the terms "installed," "connected," and "joined" should be interpreted broadly, for example, as a fixed connection, a detachable connection, or an integral connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or a connection within two elements. The term "comprising" and any variations thereof are intended to cover non-exclusive inclusion. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0038] To facilitate understanding, the application scenarios of the embodiments of this application are described below. The embodiments of this application are applied to a laser imaging device, which includes a light-emitting array, a CCD camera, and a workpiece stage. The light-emitting array can move horizontally and vertically, and the workpiece stage can move vertically. In related technologies, during laser imaging, the workpiece stage needs to be moved to the opposite side (e.g., directly below) of the light-emitting array's emission direction to achieve selective scanning and exposure of the photosensitive coating area on the workpiece stage by the laser.

[0039] For example, the components related to the light-emitting array may include a horizontal guide rail, a horizontal moving platform, and a vertical moving platform; the horizontal moving platform is disposed on the horizontal guide rail and can move along the horizontal guide rail, and a vertical guide rail is disposed on the horizontal moving platform; the vertical moving platform is disposed on the vertical guide rail and can move along the vertical guide rail, and a light source (e.g., a row of multiple lasers distributed in a straight line) is disposed on the vertical moving platform.

[0040] For ease of description, in the following embodiments, the plane containing the side of the workpiece stage facing the emitted light array is used as the reference plane, and a first (rectangular) coordinate system X parallel to this reference plane is established for the pixels on the workpiece stage. D O D Y D In this first coordinate system, the Y-axis is parallel to the upper preset axis of the workpiece stage (this preset axis may not be parallel to the vertical direction); a second (rectangular) coordinate system X is established for the light output array points, parallel to this reference plane. T O T Y T In this second coordinate system, the X-axis and Y-axis are parallel to the horizontal and vertical directions, respectively. The horizontal direction refers to the direction parallel to the pixel rows of the desired image to be formed on the exposure area of ​​the aforementioned reference plane, and the vertical direction refers to the direction perpendicular to the selected horizontal direction. Therefore, the horizontal and vertical directions in this application vary with the location of the exposure area and the direction of the pixel rows of the desired image to be formed on the exposure area; the specific directions are not limited here. The second coordinate system and the first coordinate system can be located on the same plane (i.e., the reference plane) or they can be located on two related parallel planes.

[0041] The specific process described below in the embodiments of this application is as follows. Please refer to [link / reference]. Figure 2 One embodiment of a laser imaging control method in this application may include:

[0042] S201: Control the light-emitting array to perform preset pattern exposure on the heat-sensitive material area on the workpiece stage according to the preset position guidance in the preset second coordinate system at least three preset position areas in the second coordinate system.

[0043] The applicant noted that, in order to ensure the accuracy of imaging, after the laser imaging equipment is first run or after a certain period of operation, it is necessary to reset the workpiece stage and the light output array to the preset zero point position to redetermine the positional mapping relationship between the workpiece stage and the light output array.

[0044] Specifically, the control system can control the light-emitting array to perform preset pattern exposure on the heat-sensitive material area on the workpiece stage according to the position guidance in the preset second coordinate system at least three preset position areas in the second coordinate system.

[0045] In addition, the control system also needs to record the coordinates T of the feature points of at least three preset patterns in the second coordinate system during the exposure process. i T i In this context, i is a positive integer used to identify different feature points.

[0046] Optionally, the heat-sensitive material area can be formed by heat-sensitive material embedded in the surface of the workpiece stage, or it can be formed by heat-sensitive material that is detachably fixed to the surface. Preferably, the heat-sensitive material is disposed in the edge area of ​​the workpiece stage outside the area used to fix the workpiece.

[0047] S202: Use a CCD camera to identify feature points D in at least three adjacent preset images. i The coordinates of the point in the first coordinate system.

[0048] After forming at least three preset patterns located at different positions, the control system can use a CCD camera to directly capture the plane containing the heat-sensitive material area on the workpiece stage and identify each feature point D in each preset pattern. i The coordinates in the first coordinate system. For example, a CCD camera can identify one or more fixed points on a workpiece stage. The specific algorithm for identifying the coordinates of points in the plane can refer to existing technologies, which will not be elaborated here.

[0049] Among them, the feature points in the preset graphic are preferably points that can be easily identified in the preset graphic, such as the intersection of a cross graphic, the center point of a centrally symmetrical graphic, etc.

[0050] S203: According to D i T i Calculate the mapping relationship between points in the first coordinate system and the second coordinate system.

[0051] In determining D i T i Then we can calculate the mapping relationship between points in the first coordinate system and the second coordinate system.

[0052] For example, such as Figure 3 As shown, assume that the coordinates of three feature points D1, D2, and D3 in the first coordinate system are (A1, B1), (A2, B2), and (A3, B3), respectively, and their coordinates in the second coordinate system are T1(M1, N1), T2(M2, N2), and T3(M3, N3), respectively. According to existing technology, the applicable Cartesian coordinate system mapping formula between the feature points in the first coordinate system and the second coordinate system is:

[0053] X T = X D *cosθ- Y D*sinθ+A0 (1)

[0054] Y T = X D *sinθ+ Y D *cosθ+B0 (2)

[0055] Substitute the coordinates of the three feature points D1, D2, and D3 in the two coordinate systems into equations (1) to (2) to obtain the values ​​of A0, B0, and θ. Substitute these values ​​into equations (1) and (2) to obtain the mapping relationship between the points in the first coordinate system and the points in the second coordinate system.

[0056] It is understandable that coordinate transformation between two Cartesian coordinate systems can also be achieved by referring to various methods in the technology, such as coordinate transformation based on matrix transformation based on the principles of translation and rotation, which will not be elaborated here.

[0057] S204: Based on the mapping relationship, the coordinates of the pixel exposure points in the exposure area of ​​the workpiece stage are mapped to the second coordinate system, and the light output array is controlled to expose the pixel exposure points in the exposure area of ​​the workpiece stage according to the position in the second coordinate system.

[0058] After obtaining the mapping relationship between points in the first coordinate system and the second coordinate system, the coordinates of the pixel exposure points in the exposure area of ​​the workpiece stage can be mapped to the second coordinate system according to the mapping relationship. In this way, the control system can control the light-emitting array to scan the exposure area of ​​the workpiece stage, and expose the pixel exposure points in the exposure area of ​​the workpiece stage according to their positions in the second coordinate system during the scanning process, forming a latent image. Taking a light-emitting array composed of lasers as an example, the specific imaging process is as follows: The image to be imaged on the exposure area of ​​the workpiece is rasterized (the specific rasterization process is existing technology) to obtain the position information of the laser exposure points in the exposure area; during the movement of the lasers on the light-emitting array, the real-time position of the lasers (or the projection points of the lasers on the exposure area) on the light-emitting array can be used to determine whether the position where the laser can be exposed is consistent with the mapped position of the laser exposure points in the exposure area; if they are consistent, the corresponding laser can be activated for exposure until the exposure of the entire exposure area is completed.

[0059] As can be seen from the above disclosure, in this embodiment, after the laser imaging device is initially run or after a certain period of operation, the light-emitting array is first controlled to expose preset patterns at at least three different positions on the thermosensitive material area set on the workpiece stage. Then, the mapping relationship between points in the first coordinate system and the second coordinate system is calculated using the coordinates of the feature points of each of the at least three preset patterns in both the first and second coordinate systems. Finally, the coordinates of the pixel exposure points in the exposure area on the workpiece stage are mapped to the second coordinate system according to the mapping relationship. Therefore, in this embodiment, the mapping relationship between the displacement position coordinate system of the light-emitting array in the laser imaging device and the position coordinate system of the exposure area on the workpiece stage can be periodically calibrated by coordinate system transformation. This allows for dynamic correction of deviations caused by deformation or displacement of the workpiece stage according to the working environment, thereby improving the accuracy of laser imaging.

[0060] This application embodiment also provides a laser imaging control system, which may include:

[0061] The first control module is used to control the light-emitting array to expose the thermal material area on the workpiece stage to a preset pattern according to the position guidance in the preset second coordinate system at least three preset position areas in the second coordinate system, so as to form at least three preset patterns in the thermal material area.

[0062] The recording module is used to record the coordinates T of the feature points of at least three preset graphics in the second coordinate system. i ;

[0063] The recognition module uses a CCD camera to identify feature points D in at least three preset images. i The coordinates in the first coordinate system, where the first coordinate system and the second coordinate system lie in the same plane or in parallel planes;

[0064] The second control module is used to control according to D. i T i The mapping relationship between points in the first coordinate system and the second coordinate system is calculated. Based on the mapping relationship, the coordinates of the pixel exposure points in the exposure area of ​​the workpiece stage are mapped to the second coordinate system so as to control the light output array to expose the pixel exposure points in the exposure area of ​​the workpiece stage according to the position in the second coordinate system.

[0065] Optionally, as a possible implementation, the second control module in this application embodiment may include:

[0066] Computational unit, used to convert D i T i The mapping relationship between points in the first coordinate system and points in the second coordinate system is obtained by iterative calculation using the preset Cartesian coordinate system mapping formula.

[0067] Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, devices, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here.

[0068] The laser imaging control system in this application embodiment has been described above from the perspective of modular functional entities. Please refer to [link to relevant documentation]. Figure 4 The computer device in the embodiments of this application will now be described from the perspective of hardware processing:

[0069] The computer device 1 may include a memory 11, a processor 12, and an input / output bus 13. The processor 12 executes the computer program to implement the above-described... Figure 2 The steps in the method embodiments shown, for example Figure 2 Steps 201 to 204 are shown. Alternatively, the processor executes a computer program to implement the functions of each module or unit in the above-described device embodiments.

[0070] The memory 11 includes at least one type of readable storage medium, including flash memory, hard disk, multimedia card, card-type memory (e.g., SD or DX memory), magnetic memory, magnetic disk, optical disk, etc. In some embodiments, the memory 11 can be an internal storage unit of the computer device 1, such as the hard disk of the computer device 1. In other embodiments, the memory 11 can be an external storage device of the computer device 1, such as a plug-in hard disk, smart media card (SMC), secure digital (SD) card, flash card, etc., equipped on the computer device 1. Furthermore, the memory 11 can include both internal storage units and external storage devices of the computer device 1. The memory 11 can be used not only to store application software and various types of data installed on the computer device 1, such as computer program code, but also to temporarily store data that has been output or will be output.

[0071] In some embodiments, processor 12 may be a central processing unit (CPU), controller, microcontroller, microprocessor or other data processing chip, used to run program code stored in memory 11 or process data, such as executing computer programs.

[0072] The input / output bus 13 can be a peripheral component interconnect (PCI) bus or an extended industry standard architecture (EISA) bus, etc. This bus can be divided into address bus, data bus, control bus, etc.

[0073] Furthermore, the computer device may also include a wired or wireless network interface 14, which may optionally include a wired interface and / or a wireless interface (such as a Wi-Fi interface, a Bluetooth interface, etc.), typically used to establish communication connections between the computer device 1 and other electronic devices.

[0074] Optionally, the computer device 1 may further include a user interface, which may include a display, an input unit such as a keyboard, and optionally, a standard wired interface or a wireless interface. Optionally, in some embodiments, the display may be an LED display, a liquid crystal display, a touch-sensitive liquid crystal display, or an OLED (Organic Light-Emitting Diode) touchscreen, etc. The display may also be appropriately referred to as a screen or display unit, used to display information processed in the computer device 1 and to display a visual user interface.

[0075] Figure 4 Only computer device 1 with components 11-14 and computer programs is shown; those skilled in the art will understand that... Figure 4 The structure shown does not constitute a limitation on the computer device 1, and may include fewer or more components than shown, or combine certain components, or have different component arrangements.

[0076] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, can perform the above-described functions. Figure 2 The steps in the method embodiments shown, for example Figure 2 Steps 201 to 204 are shown. Alternatively, the processor executes a computer program to implement the functions of each module or unit in the above-described device embodiments.

[0077] In the several embodiments provided in this application, it should be understood that the disclosed systems, apparatuses, and methods can be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative; for instance, the division of units is only a logical functional division, and in actual implementation, there may be other division methods. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Furthermore, the coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection between apparatuses or units through some interfaces, and may be electrical, mechanical, or other forms.

[0078] The units described as separate components may or may not be physically separate. The components shown as units may or may not be physical units; that is, they may be located in one place or distributed across multiple network units. Some or all of the units can be selected to achieve the purpose of this embodiment according to actual needs.

[0079] Furthermore, the functional units in the various embodiments of this application can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0080] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of this application, in essence, or the part that contributes to the prior art, or all or part of the technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods described in the various embodiments of this application. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0081] The above-disclosed content is only used to illustrate the technical solutions of this application, and not to limit them; although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or make equivalent substitutions for some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this application.

Claims

1. A laser imaging control method, characterized in that, The laser imaging method is applied to a laser imaging device, which includes a light-emitting array, a CCD camera, and a workpiece stage. The light-emitting array is controlled to expose a preset pattern on the thermal material area on the workpiece stage in at least three preset position areas in the second coordinate system according to the position guidance in the preset second coordinate system, so as to form at least three preset patterns in the thermal material area; Record the coordinates T of the feature points of each of the at least three preset graphics in the second coordinate system. i ; The CCD camera is used to identify feature points D in the at least three preset patterns. i The coordinates in the first coordinate system are located in the same plane or in parallel planes as the second coordinate system. When the plane on the side of the workpiece stage facing the light-emitting array is taken as the reference plane, the first coordinate system is a rectangular coordinate system parallel to the reference plane established for the pixels on the workpiece stage. The Y-axis in the first coordinate system is parallel to the preset axis on the workpiece stage. The second coordinate system is a rectangular coordinate system parallel to the reference plane established for the light-emitting array points. The X-axis and Y-axis in the second coordinate system are parallel to the horizontal and vertical directions, respectively. The horizontal direction refers to the direction parallel to the pixel row of the image to be formed on the exposure area of ​​the reference plane, and the vertical direction refers to the direction perpendicular to the horizontal direction. According to the D i T i The mapping relationship between points in the first coordinate system and the second coordinate system is calculated, and the coordinates of the pixel exposure points in the exposure area of ​​the workpiece stage are mapped to the second coordinate system according to the mapping relationship. The light output array is then controlled to expose the pixel exposure points in the exposure area of ​​the workpiece stage according to their positions in the second coordinate system.

2. The method according to claim 1, characterized in that, According to the D i T i Calculate the mapping relationship between the first coordinate system and the second coordinate system. include: D i T i Substitute into the preset Cartesian coordinate system mapping formula: X T = X D *cosθ- Y D *sinθ+A0 (1) Y T = X D *sinθ+ Y D *cosθ+B0 (2) The values ​​of A0, B0 and θ of the points in the first coordinate system in the second coordinate system are obtained by iterative calculation based on equations (1) and (2).

3. The method according to claim 1 or 2, characterized in that, The thermally sensitive material area set on the workpiece stage is formed by embedding thermally sensitive material into the surface.

4. The method according to claim 1 or 2, characterized in that, The thermally sensitive material area set on the workpiece stage is formed by a thermally sensitive material that can be detachably fixed to the surface.

5. The method according to claim 1 or 2, characterized in that, The preset graphic is a centrally symmetrical graphic.

6. The method according to claim 1 or 2, characterized in that, The preset shape is a cross.

7. A laser imaging control system, characterized in that, include: The first control module is used to control the light-emitting array to expose a preset pattern on the thermal material area on the workpiece stage in at least three preset position areas in the second coordinate system according to the position guidance in the preset second coordinate system, so as to form at least three preset patterns in the thermal material area. The recording module is used to record the coordinates T of the feature points of each of the at least three preset graphics in the second coordinate system. i ; The recognition module is used to identify feature points D in the at least three preset images using a CCD camera. i The coordinates in the first coordinate system are located in the same plane or in parallel planes as the second coordinate system. When the plane on the side of the workpiece stage facing the light-emitting array is taken as the reference plane, the first coordinate system is a rectangular coordinate system parallel to the reference plane established for the pixels on the workpiece stage. The Y-axis in the first coordinate system is parallel to the preset axis on the workpiece stage. The second coordinate system is a rectangular coordinate system parallel to the reference plane established for the light-emitting array points. The X-axis and Y-axis in the second coordinate system are parallel to the horizontal and vertical directions, respectively. The horizontal direction refers to the direction parallel to the pixel row of the image to be formed on the exposure area of ​​the reference plane, and the vertical direction refers to the direction perpendicular to the horizontal direction. The second control module is used to control the data according to the D. i T i The mapping relationship between points in the first coordinate system and the second coordinate system is calculated, and the coordinates of the pixel exposure points in the exposure area of ​​the workpiece stage are mapped to the second coordinate system according to the mapping relationship, so as to control the light output array to expose the pixel exposure points in the exposure area of ​​the workpiece stage according to the position in the second coordinate system.

8. The system according to claim 7, characterized in that, The second control module includes: The computing unit is used to process the D i T i The mapping relationship between points in the first coordinate system and points in the second coordinate system is obtained by iterative calculation using a preset Cartesian coordinate system mapping formula.

9. A computer device, characterized in that, The computer device includes a processor for implementing the method as described in any one of claims 1 to 6 when executing a computer program stored in a memory.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, it implements the method as described in any one of claims 1 to 6.

Images