A concave laser engraving device and a laser engraving method thereof

Abstract

The application discloses a kind of intaglio laser engraving device, for engraving intaglio plate pattern on the laser engraving plate material to be, including detection module and measurement feedback module, detection module is set to the upper portion of laser engraving plate material, detection is carried out before, in the process, after laser engraving processing starts;Measurement feedback module, the result detected by receiving detection module is automatically fed back to terminal display system.The present application provides a kind of intaglio laser engraving device and its laser engraving method, compared with the existing intaglio laser engraving printing process, can real-time detection, timely feedback detection result, according to the detection result of real-time feedback timely adjustment process parameters, to realize closed-loop feedback plate engraving process quality control, overcome the defects existing in the quality control for meeting consistency, stability.

Description

Technical Field

[0001] This invention relates to a gravure laser engraving device and its laser engraving method, belonging to the field of securities printing technology. Background Technology

[0002] Existing gravure laser engraving typically uses the following methods to control the three-dimensional quality of the engraving pattern.

[0003] One method is to use a contact-type electronic digital height gauge to control the depth quality of the printing pattern. However, due to limitations in its function and the diameter of the measuring head, it is not possible to directly detect three-dimensional quality information such as the width, slope, and ink line structure of the printing pattern.

[0004] Another approach is to pre-calibrate the laser engraving process parameters to ensure equipment stability and consistency of process parameters. However, due to the long processing time and fluctuations in ambient and cooling water temperatures, the laser, a key component of the equipment, also experiences performance fluctuations. For example, increases or decreases in energy can lead to variations in plate quality. Therefore, it is impossible to precisely control the process parameters.

[0005] Another method is to use offline 3D shape inspection equipment for inspection. However, this type of inspection is usually carried out after the laser engraving process is completed. Therefore, if the pattern does not meet the quality requirements, on the one hand, it wastes dozens of hours of processing time and affects the product development or production schedule. On the other hand, it takes a long time to discover the quality problems after the product is scrapped, which may lead to the same continuous scrapping of the gravure plates that are already in production. Summary of the Invention

[0006] The technical problem to be solved by the present invention is to provide a gravure laser engraving device.

[0007] Another technical problem to be solved by the present invention is to provide a method for intaglio laser engraving.

[0008] To achieve the above-mentioned technical objectives, the present invention adopts the following technical solution:

[0009] A gravure laser engraving device includes a photolithography module, a detection module, a measurement feedback module, and a control module.

[0010] The photolithography module is used to etch patterns onto the printing plate;

[0011] The detection module is used to detect the three-dimensional parameters of the pattern etched by the photolithography module before, during and after the laser engraving process.

[0012] The measurement feedback module analyzes the three-dimensional parameters detected by the receiving detection module and sends the analysis results to the control module.

[0013] The control module receives the analysis results from the measurement feedback module and controls the lithography module based on the analysis results.

[0014] Preferably, the measurement feedback module includes a data receiving unit, a data analysis unit, and an analysis result sending unit.

[0015] The receiving data department receives the detection data sent by the detection module and sends it to the data analysis department;

[0016] The data analysis department receives the test data, compares it with the stored standard data, calculates the difference between the standard value and the actual value, derives different analysis results based on the difference, and sends the analysis results to the analysis result sending department.

[0017] Among the better aspects, the analysis results include automatic calibration, laser engraving of the pattern area, stopping laser engraving, and continuing laser engraving.

[0018] Preferably, the detection module includes a three-dimensional detection microscope, which is set at a preset distance from the plate to detect the three-dimensional structural parameters of the pattern on the plate.

[0019] Preferably, it also includes a modeling module, which establishes the photolithographic detection template of the gravure laser engraving device.

[0020] Preferably, it also includes a verification modeling module, which verifies the content of the photolithography inspection template established in the modeling module based on the actual situation of the gravure laser engraving device and the plate-making process requirements.

[0021] Preferably, it also includes a template management module, which stores the templates that have already been created in the modeling module.

[0022] Preferably, it also includes a terminal device, where the measurement feedback module feeds back all the detection data to the terminal device.

[0023] A laser engraving method using a gravure laser engraving apparatus, comprising:

[0024] S1: Place the plate material on the processing support table of the gravure laser engraving device and start the depth calibration detection program of the detection module;

[0025] S2: Start the photolithography module to laser-etch a depth calibration pattern at a designated location outside the pattern area;

[0026] S3: The detection module performs three-dimensional automatic detection of the depth calibration pattern and sends the detection data to the measurement feedback module;

[0027] S4: The measurement feedback module compares and analyzes the received test data with the standard data. If the data exceeds the standard tolerance range, it sends an automatic calibration command to the control module; if the data does not exceed the standard tolerance, it sends a command to the control module to start laser engraving.

[0028] S5: If the control module receives the automatic calibration command in step S4, the control module sends an automatic calibration command to the detection module. After the detection module performs automatic calibration, it repeats steps S2-S4 until the three-dimensional data of the depth calibration pattern is within the standard value range. If the control module receives the command to start laser engraving in step S4, it turns on the photolithography module to perform laser engraving.

[0029] S6: The photolithography module performs laser engraving on the patterned area of ​​the plate and starts the sampling depth detection program of the detection module.

[0030] S7: After the photolithography module etches the first sampling pattern, it performs three-dimensional detection on the sampling pattern, detects the specified three-dimensional parameters of the cross section, and sends the three-dimensional parameters of the cross section to the measurement feedback module.

[0031] S8: The measurement feedback module compares and analyzes the received three-dimensional parameters of the cross section with the standard data. If the parameters exceed the standard tolerance range, it sends a command to the control module to stop laser engraving; if the parameters do not exceed the standard tolerance, it sends a command to the control module to continue laser engraving.

[0032] S9: During the process of laser engraving the pattern from the first to the last opening in the photolithography module, the detection module repeats the detection process of steps S7-S8.

[0033] S10: After all laser engraving processes are completed, the detection module performs depth detection on the designated positions from the first to the last opening and sends the obtained three-dimensional parameters to the measurement feedback module.

[0034] S11: The measurement feedback module receives the three-dimensional parameter analysis uniformity from step S10;

[0035] S12: After all laser engraving processes on the plate are completed, the measurement feedback module sends all the detection data back to the terminal equipment.

[0036] Preferably, before step S1, the method further includes:

[0037] S00: Use the modeling module to create a photolithographic detection template for the gravure laser engraving device;

[0038] S01: Using the verification modeling module, verify the content of the photolithography detection template established in the modeling module according to the actual situation of the gravure laser engraving device and the plate making process requirements.

[0039] The present invention has the following technical effects: The present invention provides a gravure laser engraving device and a laser engraving method, which, compared with the existing gravure laser engraving printing process, can detect in real time, provide timely feedback on detection results, and adjust process parameters in a timely manner based on the real-time feedback detection results, thereby realizing closed-loop feedback quality control of the printing plate engraving process and overcoming the defects of the existing quality control in meeting consistency and stability requirements. Attached Figure Description

[0040] Figure 1 This is a schematic diagram of the composition of the gravure laser engraving device of the present invention;

[0041] Figure 2 This is a schematic diagram of the plate to be laser-engraved in an embodiment of the present invention;

[0042] Figure 3 This is a flowchart of the laser engraving method of the gravure laser engraving apparatus of the present invention;

[0043] Figure 4 for Figure 3 Flowchart of steps preceding step S1. Detailed Implementation

[0044] The technical content of the present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0045] like Figure 1 As shown, the gravure laser engraving device 10 provided by the present invention includes a base 1, a workpiece carrying platform 2, a fixed bracket 3, a photolithography module 4, a detection module 5, a measurement feedback module (not shown), and a control module (not shown). The workpiece carrying platform 2 is mounted on the base 1, and is parallel to the horizontal plane, used to carry the workpiece to be processed and move it in a certain direction to complete the laser engraving of the pattern. The fixed bracket 3 is mounted on the base 1, and the extension direction of the fixed bracket 3 is parallel to the movement direction of the workpiece carrying platform 2. The photolithography module 3 and the detection module 4 are both mounted on the fixed bracket 5. Since the measurement feedback module and the control module are software installed on a computer, they are not shown in the figure. The computer is connected to the photolithography module 3 and the detection module 4.

[0046] Specifically, the photolithography module 4 is used to engrave patterns on the plate. This plate is for securities. Generally, the plate consists of a patterned area and surrounding empty areas, and the patterned area is arranged in an m-column * n-row matrix layout, totaling m * n squares. Securities of different denominations have different sizes, therefore the corresponding matrix layouts of the plates are also different. Those skilled in the art should understand that using the gravure laser engraving device of this invention to laser engrave plates with any matrix layout falls within the protection scope of this invention.

[0047] The detection module 5 is used to detect the three-dimensional parameters of the pattern engraved by the photolithography module 4 before, during, and after laser engraving. These three-dimensional parameters include the pattern width, depth, slope, and the width, height, and slope of the ink line at the bottom of the pattern. The ink line is a parameter in the photolithography process for securities, and it has a crucial impact on the suitability of engraving for intaglio printing and anti-counterfeiting. Specifically, before laser engraving begins, a depth calibration pattern is laser-engraved at a designated location outside the pattern area, and the detection module 5 detects the three-dimensional parameters of this pattern. During laser engraving, the detection module 5 detects the three-dimensional parameters of a sampled pattern from each section of the plate. After laser engraving is completed, the detection module 5 detects the three-dimensional parameters of a designated area from each section. All three-dimensional parameters detected at these three different times are sent to the measurement feedback module. The detection module 5 includes a three-dimensional detection microscope, which is positioned at a preset distance from the plate and is used to detect the three-dimensional structural parameters of the pattern on the plate.

[0048] The measurement feedback module receives and analyzes the three-dimensional parameters detected by the detection module 5, and sends the analysis results to the control module. This measurement feedback module includes a data receiving unit, a data analysis unit, and an analysis result sending unit. The data receiving unit receives the detection data sent by the detection module and sends it to the data analysis unit. The data analysis unit receives the detection data, compares it with stored standard data, calculates the difference between the data and the standard value, derives different analysis results based on the difference, and sends the analysis results to the analysis result sending unit. Specifically, when the measurement feedback module receives the three-dimensional parameters of the depth correction pattern detected by the detection module before laser engraving begins, it compares and analyzes these three-dimensional parameters with the standard parameters. If the difference between the three-dimensional parameters and the standard parameters exceeds the standard value tolerance range, it sends an automatic calibration command to the control module; if it does not exceed the standard value tolerance, it sends a command to the control module to begin laser engraving of the pattern area. When the measurement feedback module receives the three-dimensional parameters of the sampled pattern detected by the detection module, it compares and analyzes these parameters with standard parameters. If the difference between the three-dimensional parameters and the standard parameters exceeds the standard tolerance range, it sends a command to the control module to stop laser engraving; if the difference does not exceed the standard tolerance value, it sends a command to the control module to continue laser engraving. After the laser engraving process is completed, the measurement feedback module receives the three-dimensional parameters detected in each designated area and generates a detection report, which is sent to the display terminal to provide feedback on the measurement results to the designer and plate-making quality control personnel.

[0049] The control module receives the analysis results from the measurement feedback module and controls the photolithography module 4 based on these results. Specifically, when the control module receives an automatic calibration command, it controls the photolithography module 4 to perform automatic calibration until it receives a command indicating that laser engraving of the patterned area is possible. When the control module receives this command, it controls the photolithography module to perform laser engraving on the patterned area of ​​the substrate. When the control module receives a command to stop laser engraving, it controls the photolithography module 4 to immediately stop laser engraving.

[0050] The gravure laser engraving device 10 of the present invention also includes a modeling module (not shown). This modeling module establishes a photolithographic inspection template for the gravure laser engraving device. The photolithographic inspection template includes information such as the name of the typical pattern to be inspected based on the single-page pattern, the inspection location, etc., the selection of the specific pattern location through the inspection interface software, the selection of a cross-section perpendicular to the line direction, and the marking of the desired inspection depth, width, slope, and other standard three-dimensional parameters. After setting, the first inspection template file is output. It should be noted that the photolithographic inspection template can arbitrarily add or remove different parameters according to actual production needs.

[0051] In addition, the gravure laser engraving device of the present invention also includes a verification modeling module. This verification modeling module verifies the content of the photolithographic detection template established in the aforementioned modeling module, based on the actual situation of the gravure laser engraving device and the plate-making process requirements. Specifically, the verification modeling module inputs the first detection template file into the gravure laser engraving equipment. The plate-making personnel first verify the content of the first modeling, and based on the actual situation of the laser engraving processing system and the plate-making process requirements, set parameters such as the plate texture quality tolerance threshold in the 3D detection software to complete the detection template modeling, and output the second detection template file. The length parameter is set to 5-20 micrometers, and the slope parameter is set to 5-10 degrees. During photolithography, if the detected plate texture length or slope is within the range of the length parameter 5-20 micrometers or 5-10 degrees, it is considered to meet the plate texture requirements; if the detected actual plate texture length or slope is close to the two critical values, the feedback module will send an alarm signal. The numerical range of the above parameters can be arbitrarily designed according to the actual process requirements of securities of different face values ​​or securities with different anti-counterfeiting patterns.

[0052] In addition, the gravure laser engraving device of the present invention also includes a template management module, which stores templates already created in the modeling module. For laser engraving of plates with the same face value, the existing templates can be called up, eliminating the need for remodeling.

[0053] The laser engraving method using the gravure laser engraving device of the present invention will be described in detail below.

[0054] like Figure 2As shown, this embodiment uses a plate with dimensions of 850mm*860mm for illustration. The pattern area 6 measures 650mm*640mm, arranged in a 5-column*8-row matrix layout, totaling 40 sheets, with each sheet measuring 130mm x 80mm. The following description uses this size plate as an example. Those skilled in the art should understand that laser engraving of any matrix layout plate using the gravure laser engraving device of this invention falls within the protection scope of this invention.

[0055] like Figure 3 As shown, the laser engraving method of the gravure laser engraving apparatus of the present invention includes:

[0056] S1: Place the plate material on the workpiece support stage 2 of the gravure laser engraving device 10, and start the depth calibration detection program of the detection module 5.

[0057] S2: Start the photolithography module 4 to laser-etch a depth calibration pattern at a designated position outside the pattern area 6;

[0058] S3: Detection module 5 performs three-dimensional automatic detection of the depth calibration pattern and sends the detection data to the measurement feedback module;

[0059] S4: The measurement feedback module compares and analyzes the received test data with the standard data. If the data exceeds the standard tolerance range, it sends an automatic calibration command to the control module; if the data does not exceed the standard tolerance, it sends a command to the control module to start laser engraving.

[0060] S5: If the control module receives the automatic calibration command in step S4, the control module sends an automatic calibration command to the detection module 5. After the detection module 5 performs automatic calibration, it repeats steps S2-S4 until the three-dimensional data of the depth calibration pattern is within the standard value range. If the control module receives the command to start laser engraving in step S4, it turns on the photolithography module 4 to perform laser engraving.

[0061] S6: The photolithography module 4 performs laser engraving on the pattern area 6 of the plate and starts the sampling depth detection program of the detection module 5.

[0062] S7: After the photolithography module etches the first sampling pattern 601, it performs three-dimensional detection on the sampling pattern, detects the specified three-dimensional parameters of the cross section, and sends the three-dimensional parameters of the cross section to the measurement feedback module.

[0063] S8: The measurement feedback module compares and analyzes the received three-dimensional parameters of the cross section with the standard data. If the parameters exceed the standard tolerance range, it sends a command to the control module to stop laser engraving; if the parameters do not exceed the standard tolerance, it sends a command to the control module to continue laser engraving.

[0064] S9: During the process of laser engraving the pattern from the first opening 601 to the 640th opening by the photolithography module, the detection module repeats the detection process of steps S7-S8.

[0065] S10: After all laser engraving processes are completed, the detection module performs depth detection on the designated positions from the first to the 40th opening and sends the obtained three-dimensional parameters to the measurement feedback module.

[0066] S11: The measurement feedback module receives the three-dimensional parameter analysis uniformity from step S10;

[0067] S12: After all laser engraving processes on the plate are completed, the measurement feedback module sends all the detection data back to the terminal equipment.

[0068] The three-dimensional parameters of the printing plate include the width, depth, and slope of the plate pattern, as well as the width, height, and slope of the ink pull line at the bottom of the plate pattern. The ink pull line is a parameter in the photolithography process for securities, and it has a crucial impact on the suitability of engraving and intaglio printing and anti-counterfeiting measures.

[0069] The length parameter is set to 5-20 micrometers, and the slope parameter is set to 5-10 degrees. During photolithography, if the detected pattern length or slope falls within the range of 5-20 micrometers or 5-10 degrees, it is considered to meet the pattern requirements. If the detected actual pattern length or slope approaches either of the two critical values, the feedback module will issue an alarm signal. The numerical range of these parameters can be arbitrarily designed according to the actual process requirements of securities with different face values ​​or different anti-counterfeiting patterns.

[0070] In addition, such as Figure 4 As shown, before step S1 above, the following steps are also included:

[0071] S00: Using the modeling module, set the content to be detected according to the single-opening pattern, and establish the first photolithography inspection template;

[0072] S01: Using the verification modeling module, based on the actual situation of the gravure laser engraving device and the plate-making process requirements, verify the modeling content completed in the verification modeling module, set the allowable plate texture quality tolerance threshold, depth calibration detection, first inspection template sampling number, uniformity and consistency detection and other parameters, and establish the second photolithography inspection template.

[0073] In summary, the gravure laser engraving device and laser engraving method provided by the present invention can achieve the following effects.

[0074] 1. Achieve online automatic measurement and analysis through electronic file modeling;

[0075] 2. The quality of the three-dimensional processing of laser-engraved gravure plates is monitored and controlled online through random sampling, and the laser engraving parameters are intelligently adjusted to ensure the consistency and stability of the engraving plate quality.

[0076] 3. By comparing the 3D design parameters and 3D tolerance quality threshold requirements of the engraved gravure electronic file, determine whether the 3D processing quality of the laser engraved gravure meets the quality requirements.

[0077] The present invention has been described in detail above. Any obvious modifications made to this invention by those skilled in the art without departing from its essential content will constitute an infringement of the patent rights of this invention and will incur corresponding legal liability.

Claims

1. A laser engraving method using a gravure laser engraving device, comprising: S00: Use the modeling module to create the photolithographic inspection template for the gravure laser engraving device; S01: Using the verification modeling module, verify the content of the photolithography detection template established in the modeling module according to the actual situation of the gravure laser engraving device and the plate making process requirements; S1: Place the printing plate on the processing support table of the gravure laser engraving device and start the depth calibration detection program of the detection module; the detection module is designed to detect the three-dimensional parameters of the engraved pattern; the three-dimensional parameters include the width, depth and slope of the printing pattern, as well as the width, height and slope of the ink line at the bottom of the printing pattern; S2: Start the photolithography module to laser-etch a depth calibration pattern at a designated location outside the pattern area; S3: The detection module performs three-dimensional automatic detection of the depth calibration pattern and sends the detection data to the measurement feedback module. The detection module includes a three-dimensional detection microscope, which is set at a preset distance from the plate material to detect the three-dimensional structural parameters of the pattern on the plate material. S4: The measurement feedback module compares and analyzes the received detection data with the standard data. If the data exceeds the standard tolerance range, it sends an automatic calibration command to the control module; if the data does not exceed the standard tolerance, it sends a command to the control module to start laser engraving. S5: If the control module receives the automatic calibration command in step S4, the control module sends an automatic calibration command to the detection module. After the detection module performs automatic calibration, it repeats steps S2-S4 until the three-dimensional data of the depth calibration pattern is within the standard value range. If the control module receives the command to start laser engraving in step S4, it turns on the photolithography module to perform laser engraving. S6: The photolithography module performs laser engraving on the pattern area of ​​the plate and starts the sampling depth detection program of the detection module; S7: After the photolithography module etches the first sampling pattern, it performs three-dimensional detection on the sampling pattern, detects the specified three-dimensional parameters of the cross section, and sends the three-dimensional parameters of the cross section to the measurement feedback module. S8: The measurement feedback module compares and analyzes the received three-dimensional parameters of the cross section with the standard data. If the parameters exceed the standard tolerance range, it sends a command to the control module to stop laser engraving; if the parameters do not exceed the standard tolerance, it sends a command to the control module to continue laser engraving. S9: During the process of the photolithography module photolithographically forming the pattern from the first opening to the last opening, the detection module repeats the detection process of steps S7-S8; S10: After all laser engraving processes are completed, the detection module performs depth detection on the designated positions from the first opening to the last opening, and sends the obtained three-dimensional parameters to the measurement feedback module. S11: The measurement feedback module receives the three-dimensional parameter analysis uniformity from step S10; S12: After all laser engraving processes on the plate are completed, the measurement feedback module feeds back all detection data to the terminal device.

2. A gravure laser engraving apparatus, comprising a photolithography module, a detection module, a measurement feedback module, a control module, a modeling module, a verification modeling module, a template management module, and a terminal device, for executing the laser engraving method of the gravure laser engraving apparatus as described in claim 1, wherein, The photolithography module is used to engrave patterns on the plate material; the detection module is used to detect the three-dimensional parameters of the patterns engraved by the photolithography module before, during and after the laser engraving process; the measurement feedback module receives the three-dimensional parameters detected by the detection module, analyzes them, and sends the analysis results to the control module; the control module receives the analysis results from the measurement feedback module and controls the photolithography module according to the analysis results. The measurement feedback module includes a data receiving unit, a data analysis unit, and an analysis result sending unit. The data receiving unit receives the detection data sent by the detection module and sends it to the data analysis unit. The data analysis unit receives the detection data, compares it with the stored standard data, calculates the difference between the data and the standard value, derives different analysis results based on the difference, and sends the analysis results to the analysis result sending unit. The analysis results include automatic calibration, laser engraving of the pattern area, stopping laser engraving, and continuing laser engraving. The detection module includes a three-dimensional detection microscope, which is set at a preset distance from the plate material to detect the three-dimensional structural parameters of the plate pattern. The modeling module establishes the photolithographic detection template for the gravure laser engraving device; The verification modeling module verifies the content of the photolithography detection template established in the modeling module based on the actual situation of the gravure laser engraving device and the plate-making process requirements. The template management module stores the templates that have been created in the modeling module; The measurement feedback module feeds back all detection data to the terminal device.

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