Jet printing machine and jet printing method

Abstract

The invention relates to a jet printing machine and a jet printing method. The jet printing machine comprises a control system, an MES management system and an execution system. The control system is in communication connection with the MES management system and the execution system; the control system is used for respectively determining area contours of circuits, windowing and drilling on the PCB, and determining a jet printing area of the PCB according to the area contours; the MES management system is used for pre-configuring jet printing information; the execution system comprises an execution device, the execution device comprises at least two jet printing sets, and the execution system is used for controlling the first jet printing set to be started to jet-print the first ink, controlling the first jet printing set to be closed and controlling the second jet printing set to be started to jet-print the second ink on the jet printing area according to preset jet printing information. According to the scheme, the printing ink is automatically switched, the printing ink is directly jet-printed in the needed area according to needs, the printing ink is cured and imaged, no chemical waste liquid or sewage is generated, the material utilization rate is high, and the time cost is low.

Description

Technical Field

[0001] The present application relates to the field of PCB process technology, and in particular to a jet printer and a jet printing method. Background Art

[0002] Existing PCB manufacturing uses traditional exposure and development technology, which has the following disadvantages for circuit layers, solder mask layers and character processing: (1) After screen printing or spraying circuit ink and solder mask ink, they need to be pre-baked and cured. After pre-baking and curing, they need to be cooled to the workshop temperature for a period of time before exposure, which is time-consuming. (2) The ink coated on the circuit is thin, and the ink on the substrate is thick, and the ink thickness is uneven. (3) Traditional exposure and development technology requires multiple equipment such as pre-baking, exposure, and development, which occupies a large area and has low workshop area utilization. (4) The development process requires the use of developer and will produce a large amount of chemical waste liquid and sewage, which is harmful to the environment and increases the cost of waste liquid and sewage treatment. (5) The equipment has a single function. When changing PCB production materials and ink colors, the stencil must be cleaned or the spray accessories must be replaced, which takes a long time for manual ink change and maintenance.

[0003] In view of the above problems, those skilled in the art have been seeking solutions. Summary of the invention

[0004] The technical problem to be solved by the present application is to provide a jet printer and a jet printing method in view of the defects of the above-mentioned prior art.

[0005] In order to achieve the above objectives, this application is implemented through the following technical solutions:

[0006] The present application provides a jet printer, including: a control system, an MES management system, and an execution system;

[0007] The control system is communicatively connected with the MES management system and the execution system;

[0008] The control system is used to respectively determine the regional contours of the circuit, window opening, and drilling on the PCB board, and determine the printing area of ​​the PCB board according to the regional contours;

[0009] The MES management system is used to pre-configure printing information, which includes PCB board production data, printing ink, printing sequence and printing process parameter formula;

[0010] The execution system includes an execution device, which includes at least two printing groups. The execution system is used to control the first printing group to open to print the first ink, and control the first printing group to close and control the second printing group to open to print the second ink on the printing area according to preset printing information.

[0011] Optionally, the control system is also used to expand the area contour by a preset threshold value to determine the area outline of the circuit, window opening, and drilling hole, and determine the printing area of ​​the PCB board based on the area outline.

[0012] Optionally, the control system is further used to determine a first difference region between the region outline and the region contour for the line, and determine the first difference region as a printing region of the line.

[0013] Optionally, the control system is also used to determine the regional outline of the PCB board for the window opening and the drilling, and to determine a second difference area between the regional outline of the PCB board and the regional outline of the window opening and the regional outline of the drilling, and to determine the second difference area as the printing area of ​​the window opening and the drilling.

[0014] Optionally, the printing group includes an ink cartridge, a conduit, a nozzle, and a switch;

[0015] The ink cartridge is used to store ink; the conduit connects the ink cartridge and the nozzle and is used to guide the ink in the ink cartridge to the nozzle;

[0016] The switch is arranged on the conduit and is used to control whether the ink flows to the nozzle;

[0017] The nozzle is used to print the ink onto the PCB board.

[0018] Optionally, the ink cartridges of the at least two printing groups store different types of inks;

[0019] The execution system is also used to control the first switch to be turned on so that the first nozzle prints the first ink according to the printing information, and to control the first switch to be turned off and the second switch to be turned on so that the second nozzle prints the second ink.

[0020] Optionally, the execution system includes a camera and a UV curing lamp, the camera is used to perform camera alignment on the PCB board, the execution system is also used to print ink on the PCB board after the camera alignment, and the UV curing lamp is used to perform UV curing on the ink on the PCB board after printing is completed.

[0021] Optionally, the first, second, etc. multiple inks may be PCB circuit ink, PCB solder resist ink, or PCB character ink;

[0022] The present application also provides a printing method, which is applied to the above-mentioned printing machine, comprising:

[0023] S1, respectively determine the area contours of the circuit, window opening, and drilling on the PCB board;

[0024] S2, determining the printing area of ​​the PCB board according to the area contour;

[0025] S3, controlling the first printing group to start printing the first ink on the printing area according to the preset printing information;

[0026] S4. According to the preset printing information, the first printing group is controlled to be closed and the second printing group is controlled to be opened to print the second ink on the printing area.

[0027] Optionally, step S2 includes:

[0028] Enlarging the area contours by preset thresholds to determine the area outlines of the lines, windows, and holes;

[0029] The printing area of ​​the PCB board is determined according to the area outline.

[0030] Optionally, determining the printing area of ​​the PCB board according to the area outline includes:

[0031] For the line, determining a first difference region between the region outline and the region contour;

[0032] The first difference set area is determined as the printing area of ​​the line.

[0033] Optionally, after determining that the first difference set area is the printing area of ​​the circuit, determining the printing area of ​​the PCB board according to the area outline further includes:

[0034] For the window opening and the hole drilling, determining the area contour of the PCB board;

[0035] Determine a second difference region between the regional outline of the PCB board and the regional outline of the window opening and the regional outline of the drilling hole;

[0036] The second difference area is determined to be a printing area of ​​the window opening and the drilling hole.

[0037] The present application provides a jet printer and a jet printing method, which adopt digital inkjet printing technology, automatically switch the printing information such as the ink to be printed and the process parameter formula through the control system, process the PCB circuit layer, solder mask layer and character layer, directly print the ink on the required area as needed, and the ink thickness on the substrate is printed as needed and solidified to form an image, thereby ensuring the uniformity of the ink thickness on the substrate, and no chemical waste liquid or sewage is generated, with high material utilization, reducing the time for switching inks and switching PCB production materials, reducing the processes such as pre-baking curing, cooling, exposure and development, reducing a large number of equipment and floor space, greatly improving the utilization rate of the workshop area, and realizing the intelligent and automated PCB manufacturing with single equipment, multi-function and multi-process application.

[0038] In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specifically cites preferred embodiments and describes them in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] The present application is described in detail below with reference to the accompanying drawings and specific implementation methods.

[0040] Figure 1 It is a structural schematic diagram of a jet printer provided by an embodiment of the present application;

[0041] Figure 2 It is a structural schematic diagram of a printing group provided in one embodiment of the present application;

[0042] Figure 3 It is a flow chart of a printing method provided in one embodiment of the present application. DETAILED DESCRIPTION

[0043] It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0044] PCB, whose English name is Printed Circuit Board, can also be called circuit board, circuit board or printed circuit board. It mainly includes rigid circuit board (RPCB), flexible circuit board (FPC / FPCB), rigid-flexible combination board (R-FPCB) and high-density interconnect board (HDI).

[0045] Figure 1 is a schematic diagram of the structure of a jet printer provided by an embodiment of the present application, see Figure 1 The present application provides a jet printer, including: a control system, an MES management system, and an execution system, wherein the control system is communicatively connected with the MES management system and the execution system.

[0046] The control system is used to respectively determine the regional contours of the circuit, window opening, and drilling on the PCB board, and determine the printing area of ​​the PCB board according to the regional contours. In one embodiment, the control system is provided with PCS software (i.e., Process Control System), which processes the graphic data of the PCB through a software algorithm, extracts the contour data of the circuit, window opening, and drilling, and forms multi-layer slice data according to the contour data, thereby generating a multi-step printing step, which can ensure the uniformity of the film thickness and contour of the solder mask printing coverage.

[0047] Optionally, the control system is also used to expand the regional contour by a preset threshold value to determine the regional outline of the circuit, window opening, and drilling, and determine the printing area of ​​the PCB board according to the regional outline. Specifically, the image on the PCB board can be acquired by the camera in the execution system, and the outlines of the circuit, window opening, and drilling can be extracted and marked according to the image. The outline retains a specified number of pixel widths. The outline is offset inward or outward by a preset threshold value to obtain the outline of the circuit, window opening, and drilling, and the preset threshold value is determined according to the detection result of the printed image. According to the computing power of the inkjet printer, after the control system completes the calculation of this step, the execution system will synchronize the outline and outline data output by the control system, and print the outline, which can ensure the smoothness of the edge contour of the window opening and drilling, and avoid the diffusion of ink to the diffusion contour in the subsequent steps.

[0048] Optionally, the control system is also used to determine the first difference area between the regional outline and the regional contour of the line, and determine the first difference area as the printing area of ​​the line. Specifically, there is a blank area, namely the first difference area, between the outline and the contour of the line (i.e., both sides of the line). According to the computing power of the printer, after the control system completes the calculation of this step, the execution system will synchronize the data of the first difference area output by the control system, and print the first difference area, which can ensure that the film thickness of the ink on the line is consistent, so that the ink does not flow along the side of the line during the next step of printing, thereby reducing the thickness of the line and the line corner, causing poor quality.

[0049] Optionally, the control system is also used to determine the regional contour of the PCB board for window opening and drilling, and to determine the second difference area between the regional contour of the PCB board and the regional outline of the window opening and the regional outline of the drilling, and to determine the second difference area as the printing area for window opening and drilling. Specifically, the area surrounded by the outer contour of the PCB board is the printable area, and the printer only prints in this area; the area surrounded by the regional outline of the window opening and the area surrounded by the regional outline of the drilling are both non-printable areas. The non-printable area is excluded from the printable area, and the remaining printable area is the second difference area. According to the computing power of the printer, after the control system completes the calculation of this step, the execution system will synchronize the data of the second difference area output by the control system, and print the second difference area. This step is to cover the areas that need to be covered by the circuit and the substrate, forming a solder mask layer of the PCB board, which plays a solder-proof role.

[0050] The MES management system is used to pre-configure printing information, which includes PCB board production materials, printing inks, printing sequence and printing process parameter formulas. Specifically, the PCB board to be printed includes a variety of production materials. The inks for printing are mainly anti-corrosion circuit inks, solder mask inks and character inks. The solder mask inks have a variety of colors, including green, blue, black, white, yellow and red; the character inks are usually white inks, but also yellow, black and other colors.

[0051] MES management system (Manufacturing Execution System) is a production information management system for the workshop execution layer of manufacturing enterprises. It provides enterprises with a manufacturing collaborative management platform including manufacturing data management, production planning management, production scheduling management, inventory management, quality management, equipment management and production process control.

[0052] Solder Mask, also known as solder mask, solder resist, solder mask, is a film layer on the surface of PCB, leaving through holes and pads on the printed circuit board, covering all circuits and copper surfaces, preventing short circuits during wave soldering, saving solder, and protecting areas where parts do not need to be soldered. This film layer is usually green. In addition to its solder resist function, it can also protect and insulate the covered circuits.

[0053] Characters, also known as logos, text, and the English name is Legend, refer to the text symbols or numbers printed on the surface of the PCB, which are mainly used to indicate assembly, maintenance locations or certification information. In one embodiment, the character ink can be directly prepared using a variety of different colors of solder mask inks.

[0054] The execution system includes an execution device, which includes at least two printing groups. The execution system is used to control the first printing group to start to print the first ink, and control the first printing group to close and control the second printing group to start to print the second ink on the printing area according to the preset printing information. In this embodiment, the printing sequence and printing process parameter formula of PCB boards of different production materials are arranged according to the ink color and category. After printing one ink on the PCB board, switch to another printing group to print another ink.

[0055] Optionally, the execution system includes a camera and a UV curing lamp. The execution system is also used to obtain pre-configured printing information. The camera is used to align the PCB board. The execution system is also used to print ink on the PCB board after the camera is aligned. The UV curing lamp is used to UV cure the ink on the PCB board after printing is completed.

[0056] Optionally, the printing information may also include printing characters, character colors, character positions, character sizes, and character printing process parameter formulas; the execution system is also used to perform camera alignment on the PCB board, and to print character ink at a preset character position on the PCB board according to the preset printing characters, and to UV cure the character ink after printing. In one embodiment, the character ink can be modulated using solder mask inks of different colors to reduce the cost required for the character ink.

[0057] As mentioned above, after the control system completes the calculation of each step, the execution system prints the calculated data. This embodiment uses piezoelectric inkjet technology, which does not require pre-baking and curing, and does not require cooling time, and can directly enter the next production process.

[0058] The above-mentioned piezoelectric inkjet printing utilizes the piezoelectric effect principle of the piezoelectric crystal in the piezoelectric drive device to apply a fixed pressure to the ink in the nozzle, so that it can be ejected on demand in the form of character or graphic recording, and UV curing is performed to form the required image.

[0059] Figure 2 is a schematic diagram of the structure of the printing group provided in one embodiment of the present application, see Figure 2 The execution device includes multiple printing groups, each of which includes an ink cartridge, a catheter, a nozzle, and a switch.

[0060] The ink cartridge is used to store ink, and each ink cartridge stores different inks. The conduit is detachably connected to the ink cartridge and the nozzle, and the conduit is used to guide the ink in the ink cartridge to the nozzle. The switch is set on the conduit to control whether the ink flows to the nozzle. The nozzle is used to print the ink onto the PCB board.

[0061] Each set of ink and nozzle works independently, and the printing is controlled by the system. After receiving the printing information sent by the MES management system, namely PCB production data, ink color, printing sequence and printing process parameter formula, ink category (such as PCB circuit ink, PCB solder mask ink and PCB character ink), the PCB board is printed in turn.

[0062] To print PCB circuit ink, PCB solder mask ink and PCB character ink in the printing area of ​​PCB board in sequence, the example is as follows:

[0063] (1) Printing the first ink, which is the PCB circuit ink. The system controls the first switch corresponding to the first ink cartridge to turn on, and controls the other switches of the printing group to turn off, and the first printing group is ready to work. After the PCB board is mounted, the camera is first positioned on the PCB board, and then the PCB circuit ink is printed on the printing area of ​​the circuit on the first surface of the PCB board and UV cured;

[0064] (2) Printing the second ink, which is PCB solder resist ink. The system controls the second switch corresponding to the second ink cartridge to turn on, and controls the other switches of the printing group to turn off, and the second printing group is ready to work. After the PCB board is mounted, the camera is first positioned on the PCB board, and then the PCB solder resist ink is printed on the window opening and drilling printing area on the first surface of the PCB board and UV cured;

[0065] (3) Printing the third ink, which is the PCB character ink. The system controls the third switch corresponding to the third ink cartridge to turn on, and controls the other switches of the printing group to turn off, and the third printing group is ready to work. After the PCB board is mounted, the camera is first positioned on the PCB board, and then the PCB character ink is printed on the first surface of the PCB board according to the character position in the printing information and UV cured.

[0066] Based on the above steps, the PCB circuit ink, PCB solder mask ink and PCB character ink can be sprayed in sequence on the same surface of the same PCB board. Similarly, other inks can be sprayed on the PCB board. After the first surface of the PCB board is sprayed, the second surface of the PCB board can be sprayed in the same way. Therefore, the same printer can be used to spray the circuit, solder mask, character and other inks on the same PCB board. The equipment is simple and the printing efficiency is high.

[0067] Optionally, the execution device may also include a cleaning group, which mainly includes a cleaning group and a gas group. The cleaning group includes a liquid box, a cleaning conduit, a cleaning switch, and a cleaning nozzle. The liquid box stores liquid for cleaning ink; the gas group includes an air pump, a gas conduit, and a gas switch. The air pump can be a gas tank storing special gas or a device for extracting air. The connection method of the cleaning group is the same as that of the printing group, which will not be repeated here.

[0068] The cleaning group is used to clean the ink that escapes during the printing process of the PCB board, and the duct and nozzle of the printing group that are stained with ink. For example, during the cleaning process, one end of the duct connected to the ink cartridge in the printing group can be connected to the liquid box, and the switch of the printing group can be controlled to turn on so that the cleaning liquid flows out from the duct and nozzle of the printing group to achieve the purpose of cleaning the ink. This can realize the reuse of the printing group in the printing machine, and there is no need to replace the printing group with different inks during the printing process, which can improve the printing efficiency of the printing machine.

[0069] The inkjet printer of the present application only requires one device, which can automatically change the ink color according to the customer production plan information obtained by the MES management system, and automatically configure the printing process parameter formula corresponding to the ink, and automatically print solder mask and characters on the PCB board without manual ink change, which can reduce labor and maintenance time, and has a small footprint and high workshop area utilization.

[0070] Figure 3 is a flow chart of a printing method provided by an embodiment of the present application, see Figure 3 The present application also provides a printing method, which is applied to the above-mentioned printing machine, comprising:

[0071] S1. Determine the area contours of the circuit, window, and hole on the PCB board.

[0072] S2. Determine the printing area of ​​the PCB board according to the area contour.

[0073] Optionally, step S2 includes:

[0074] The area outline is enlarged by a preset threshold value to determine the area outline of the line, window opening, and drilling hole;

[0075] Determine the printing area of ​​the PCB board based on the area outline.

[0076] Specifically, the image on the PCB board can be acquired through the camera in the execution system, and the contours of the circuit, window opening, and drilling hole can be extracted and marked according to the image. The contour retains a specified number of pixel widths. The contour is offset inward or outward by a preset threshold to obtain the outline of the circuit, window opening, and drilling hole. The preset threshold is determined according to the detection result of the printed image. According to the computing power of the inkjet printer, after the control system completes the calculation of this step, the execution system will synchronize the contour and outline data output by the control system, and print the outline, which can ensure the smoothness of the edge contours of the window opening and drilling hole, and avoid the diffusion of ink to the diffusion contour in the subsequent steps.

[0077] Optionally, determining the printing area of ​​the PCB board according to the area outline includes:

[0078] For the line, determining the first difference region between the region outline and the region contour;

[0079] The first difference set area is determined as the printing area of ​​the line.

[0080] Specifically, there is a blank area, namely the first difference area, between the outline and the contour of the line (i.e., both sides of the line). According to the computing power of the inkjet printer, after the control system completes the calculation of this step, the execution system will synchronize the data of the first difference area output by the control system and print the first difference area. This can ensure that the film thickness of the ink on the line is consistent, so that the ink will not flow along the side of the line during the next printing step, thereby reducing the thickness of the line and the line corners, causing poor quality.

[0081] Optionally, after determining that the first difference set area is the printing area of ​​the circuit, determining the printing area of ​​the PCB board according to the area outline further includes:

[0082] Open windows and drill holes to determine the area outline of the PCB board;

[0083] Determine a second difference region between the regional outline of the PCB board and the regional outline of the window opening and the regional outline of the drilling hole;

[0084] The second difference area is determined as the printing area of ​​the window opening and drilling.

[0085] Specifically, the area surrounded by the outer contour of the PCB board is the printable area, and the printer only prints in this area; the area surrounded by the outline of the window area and the area surrounded by the outline of the drilling area are both non-printable areas. Excluding the non-printable area in the printable area, the remaining printable area is the second difference area. According to the computing power of the printer, after the control system completes the calculation of this step, the execution system will synchronize the data of the second difference area output by the control system, and print the second difference area. This step is to cover the areas that need to be covered by the circuit and the substrate, forming a solder mask layer of the PCB board, which plays a soldering role.

[0086] S3, controlling the first printing group to start printing the first ink on the printing area according to the preset printing information;

[0087] S4. According to the preset printing information, the first printing group is controlled to be closed and the second printing group is controlled to be opened to print the second ink on the printing area.

[0088] The inkjet printer and printing method of the present application adopt digital inkjet printing technology, automatically switch the printing information such as the ink to be printed and the process parameter formula through the control system, process the PCB circuit layer, PCB solder mask layer and PCB character layer, directly print the ink on the required area as needed, and the ink thickness on the substrate is printed as needed and solidified to form an image, thereby ensuring the uniformity of the ink thickness on the substrate and on the circuit, and no chemical waste liquid or sewage is generated, with high material utilization rate, reducing the time for switching inks and switching PCB production materials, reducing the processes such as pre-baking curing, cooling, exposure and development, reducing a large number of equipment and floor space, greatly improving the utilization rate of the workshop area, and realizing the intelligent and automated PCB manufacturing with single equipment, multi-function and multi-process application.

[0089] When processing PCB solder mask, PCB manufacturers usually need to meet the solder mask color requirements of multiple customers. To change the solder mask color, the ink on the equipment needs to be replaced. Labor and production efficiency are the key to reducing costs in PCB manufacturing. In addition to meeting the requirements for switching between multiple solder mask colors, another key factor in developing a multi-color switchable solder mask machine is that the ink of some of the printing execution components of the printer (composed of corresponding nozzles, ink cartridges, etc.) can be configured as character ink, so that a single printer can print both solder mask and characters in a multi-process, multi-functional all-in-one machine. This can not only reduce the number of ink changes and the time for changing inks, but also reduce the time for replacing PCB production materials and improve production efficiency. Therefore, this patent is intended to involve an intelligent digital inkjet printer that can switch between multiple PCB inks, and a printing method. After adding automatic switching of ink colors and production materials, it can support three or more ink colors without adding equipment or manual switching of inks and production materials. The printer's intelligent system software only needs to connect to the customer's MES system communication to control the printer to automatically switch the inks and production materials required by the customer, and use a production process formula that matches the ink to automatically perform inkjet printing production, which greatly reduces labor and production cycles and improves production efficiency.

[0090] Obviously, those skilled in the art can make various changes and modifications to the invention without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these changes and variations. The technical features of the above-described embodiments can be combined arbitrarily. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0091] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions or improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. A jet printer, characterized in that: include: Control system, MES management system, execution system; The control system is communicatively connected with the MES management system and the execution system; The control system is used to respectively determine the regional contours of the circuit, window opening, and drilling on the PCB board, and determine the printing area on the PCB board according to the regional contours; The MES management system is used to pre-configure printing information, which includes PCB board production data, printing ink, printing sequence and printing process parameter formula; The execution system includes an execution device, which includes at least two printing groups. The execution system is used to control the first printing group to open to print the first ink, and control the first printing group to close and control the second printing group to open to print the second ink on the printing area according to preset printing information.

2. The inkjet printer according to claim 1, characterized in that: The control system is also used to expand the area contour by preset thresholds to determine the area outlines of the circuits, window openings, and drillings, and to determine the printing area of ​​the PCB board based on the area outlines.

3. The inkjet printer according to claim 2, characterized in that: The control system is also used to determine a first difference region between the region outline and the region contour for the line, and determine the first difference region as a printing region of the line.

4. The inkjet printer according to claim 3, characterized in that: The control system is also used to determine the regional outline of the PCB board for the window opening and the drilling, and to determine a second difference area between the regional outline of the PCB board and the regional outline of the window opening and the regional outline of the drilling, and to determine the second difference area as the printing area of ​​the window opening and the drilling.

5. The system according to claim 1, wherein: The printing group includes an ink cartridge, a conduit, a nozzle, and a switch; The ink cartridge is used to store ink; the conduit connects the ink cartridge and the nozzle and is used to guide the ink in the ink cartridge to the nozzle; The switch is arranged on the conduit and is used to control whether the ink flows to the nozzle; The nozzle is used to print the ink onto the PCB board.

6. The system according to claim 5, characterized in that The ink cartridges of the at least two printing groups store different types of inks; The execution system is also used to control the first switch to be turned on so that the first nozzle prints the first ink according to the printing information, and to control the first switch to be turned off and the second switch to be turned on so that the second nozzle prints the second ink.

7. The system according to claim 1, characterized in that The execution system includes a camera and a UV curing lamp. The camera is used to perform camera alignment on the PCB board. The execution system is also used to print ink on the PCB board after the camera alignment. The UV curing lamp is used to perform UV curing on the ink on the PCB board after printing.

8. A printing method, characterized in that: The inkjet printer according to any one of claims 1 to 7 comprises: S1, respectively determine the area contours of the circuit, window opening, and drilling on the PCB board; S2, determining the printing area on the PCB board according to the area contour; S3, controlling the first printing group to start printing the first ink on the printing area according to the preset printing information; S4. According to the preset printing information, the first printing group is controlled to be closed and the second printing group is controlled to be opened to print the second ink on the printing area.

9. The method according to claim 8, characterized in that Step S2 includes: Enlarging the area contours by preset thresholds to determine the area outlines of the lines, windows, and holes; The printing area of ​​the PCB board is determined according to the area outline.

10. The method according to claim 9, characterized in that Determining the printing area of ​​the PCB board according to the area outline includes: For the line, determining a first difference region between the region outline and the region contour; The first difference set area is determined as the printing area of ​​the line. After determining that the first difference set area is the printing area of ​​the circuit, determining the printing area of ​​the PCB board according to the area outline further includes: For the window opening and the hole drilling, determining the area contour of the PCB board; Determine a second difference region between the regional outline of the PCB board and the regional outline of the window opening and the regional outline of the drilling hole; The second difference set area is determined to be the printing area of ​​the window opening and the drilling hole.

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