Inkjet printing device for 3D curved surfaces

Abstract

The present disclosure relates to a kind of 3D curved surface inkjet printing device, for solving the problem that printer has no necessary sensing ability to 3D curved surface printing medium and its surface in the related art.By camera assembly, towards the direction of printing medium;Inkjet printhead assembly, towards the direction of printing medium;Master control circuit assembly, control the shooting of camera assembly, and with positioning information, background picture information and printing information are analyzed, identified, then control inkjet printhead assembly in printing medium printing.It also includes sensing element and magnetic element.Make printer have sensing ability to 3D curved surface printing medium and its surface etc..It can be compared, identified by with positioning information, background picture information and printing information, automatically plan printing scheme, without manual prior intervention or / and adjustment, save the cost of labor, material cost and time cost.The present disclosure embodiment meets the sensing ability of printer to 3D curved surface printing medium and its surface, and the intelligentization of printer, improve user experience.

Description

Technical Field

[0001] This invention belongs to the field of printing technology, specifically relating to an intelligent printing technology and an inkjet printer device. Background Technology

[0002] In existing technologies, 3D curved surface printers have simple structures. These printers typically position themselves based on the edges, positioning strips, and positioning holes of the printing medium. Assuming the 3D curved surface printing medium already has a background pattern before printing, current positioning methods can lead to inaccurate printing if the printing medium is misaligned or tilted. Incorrect orientation of the printing medium (e.g., inverted placement will also invert the background image) also prevents accurate printing. Existing printers lack the necessary sensing capabilities for the 3D curved surface printing medium and its surface, requiring manual intervention or adjustment in many steps, resulting in a high rate of defective prints. This not only wastes materials but also is time-consuming, labor-intensive, and demands high skill levels from printing personnel, increasing labor, material, and time costs. Therefore, an effective solution is needed to address these problems. Summary of the Invention

[0003] The present invention was made to solve the above-mentioned problems, and various embodiments of the system and method for inkjet printing of 3D curved surfaces are provided for the purposes of the present invention.

[0004] According to the present invention, a 3D curved surface inkjet printing device includes: a camera assembly facing the printing medium; an inkjet printhead assembly facing the printing medium; and a main control circuit assembly that controls the camera assembly to capture images, analyzes and identifies the images with positioning information, background image information and printing information, and then controls the inkjet printhead assembly to print on the printing medium.

[0005] According to the present invention, an inkjet printing apparatus for 3D curved surfaces includes a camera assembly and an inkjet printhead assembly structure, comprising a sensing element configured to detect the state of the structure, the sensing element being coupled to the main control circuit assembly.

[0006] According to the present invention, the inkjet printing apparatus for 3D curved surfaces includes: a camera assembly and an inkjet printhead assembly structure, including: a magnetic element that provides a magnetic field detectable by the sensing element and coupled to the main control circuit assembly.

[0007] According to the present invention, the method of using the inkjet printing device for 3D curved surfaces is performed by the following steps: the camera component first captures multiple 2D images of the 3D curved surface printing medium; the main control circuit component derives a 3D scene estimation model through the model, reconstructs the 2D image of the current camera pose, analyzes and identifies it with the positioning information, and determines the positioning information.

[0008] According to the present invention, the motion method of the inkjet printing device for 3D curved surfaces is performed through the following steps: the main control circuit component determines the printing information that has not yet been printed based on the positioning information and plans the printing scheme. Based on the 3D scene estimation model, the motion mechanism is driven to move to the position of the printing information that has not yet been printed.

[0009] According to the present invention, the printing method of the inkjet printing device for 3D curved surfaces is performed by the following steps: the state of the structure is detected by a sensing element, the magnetic field of the structure is detected by a magnetic element, the main control circuit assembly selects a suitable nozzle based on the above, generates an electro-jet structure signal, and ink droplets are ejected from the selected nozzle on the inkjet printhead assembly for "printing".

[0010] Compared with existing technologies, the beneficial effects of this invention are as follows: By adding a camera component, sensing element, and magnetic sensor to the inkjet printhead assembly of the 3D curved surface inkjet printing device, the printer gains the ability to perceive the 3D curved surface printing medium and its surface. The printer's printing positioning methods are diversified. By comparing and identifying positioning information, background image information, and printing information, a printing plan is formulated without requiring excessive prior manual intervention or adjustments, saving labor costs, material costs, and time costs, and improving the user experience.

[0011] Other devices, methods, features, and advantages of the present invention will become apparent to those skilled in the art upon review of the following drawings and detailed description. It is intended that all such additional systems, methods, features, and advantages be included in this description, within the scope of the invention, and protected by the appended claims. Attached Figure Description

[0012] The accompanying drawings are for illustrative purposes and provide only examples of possible structures and arrangements of the disclosed inventive apparatus and methods for providing 3D curved surfaces. These drawings do not limit any changes in form and detail that may be made to the invention by those skilled in the art without departing from the spirit and scope of the invention. Embodiments will be readily understood from the following detailed description taken in conjunction with the accompanying drawings, wherein like reference numerals indicate like structural elements.

[0013] Figure 1 This is a schematic diagram of the camera assembly and inkjet printhead assembly structure 100 of a 3D curved surface inkjet printing apparatus according to an exemplary embodiment. Figure 2 This is a schematic circuit diagram of the camera assembly and inkjet printhead assembly structure of a 3D curved surface inkjet printing apparatus according to an exemplary embodiment. Figure 3This is a schematic diagram of a camera assembly and auxiliary lighting of a 3D curved surface inkjet printing apparatus according to an exemplary embodiment; Figure 4 This is a top view of a 3D curved surface inkjet printing apparatus according to an exemplary embodiment; Figure 5 This is a flowchart illustrating the workflow of a 3D curved surface inkjet printing apparatus according to an exemplary embodiment.

[0014] In the figure, elements with the same or similar reference numerals have the same or similar functions and descriptions. Specific Implementation

[0015] The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this disclosure. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this disclosure as detailed in the appended claims. It should be noted that, unless otherwise specified, the embodiments and features in the embodiments of this application can be substituted for, combined, or separated from each other.

[0016] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings.

[0017] This invention provides an inkjet printing device for 3D curved surfaces, such as... Figure 1 , 4 As shown, it comprises an inkjet printhead assembly 102, a camera assembly 104, and a main control circuit assembly 404. Figure 1 , 2 As shown in Figures 3 and 4, the camera assembly 104 includes an auxiliary lighting 302.

[0018] Preferably, such as Figure 1 As shown, in this embodiment, the inkjet printhead assembly 102 and the camera assembly 104 are mounted on the same structure, namely the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device. The camera assembly 104 and the inkjet printhead assembly 102 (including nozzles) can calculate and measure relative position information.

[0019] Preferably, such as Figure 1 , 2As shown, in this embodiment, the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device further includes sensing elements. These sensing elements include a displacement sensor 108, a ranging sensor 110, an acceleration sensor 202, and an angular velocity sensor 204. The displacement sensor 108, ranging sensor 110, acceleration sensor 202, and angular velocity sensor 204 are mounted on the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device. Specifically, the displacement sensor 108 and the ranging sensor 110 each have their own independent observation port on the outer surface of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device.

[0020] Preferably, such as Figure 1 , 2 As shown, in this embodiment, the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing apparatus further includes a magnetic element. The magnetic element also includes a gravity sensor 206. The gravity sensor 206 is mounted on the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing apparatus.

[0021] The inkjet printhead assembly 102, camera assembly 104, displacement sensor 108, and distance sensor 110 can be mounted on the same side of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved inkjet printing device, or they can be mounted on different sides but facing the same side (e.g., towards the printing medium direction). All of these are applicable to the present invention. Further description of these features is omitted here, and only the example of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved inkjet printing device being mounted on the same side is described.

[0022] Preferably, such as Figure 1 As shown, in this embodiment, the inkjet printhead assembly 102, camera assembly 104, displacement sensor 108, and distance sensor 110 are mounted on the same side of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved inkjet printing device.

[0023] The inkjet printhead assembly 102 can be any known inkjet printhead assembly, and all are applicable to this invention. The inkjet printhead assembly 102 includes nozzles, ink tanks, etc.

[0024] Preferably, such as Figure 1 As shown, in this embodiment, only one inkjet printhead assembly 102 is used; the number and type of inkjet printhead assemblies can be increased as needed. Figure 1 , 2As shown in Figure 4, the main control circuit assembly 404 selects a suitable nozzle and transmits the "spray" signal to the selected nozzle on the inkjet printhead assembly 102 via the drive circuit 406, the external contact point 112 of the camera assembly and the inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device, and the internal circuit 208. This allows the printed content (including patterns, icons, tables, text, or colors) to be "printed" onto the 3D curved surface printing medium 418.

[0025] Alternatively, the drive circuit 406 can be split into a printhead assembly drive circuit and other drive circuits. The printhead assembly drive circuit, along with the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device, can be combined into a single structure containing the camera assembly, inkjet printhead assembly, and printhead drive circuit.

[0026] The camera assembly 104 can be any known camera, including visible light camera assemblies, infrared camera assemblies, and ultraviolet camera assemblies, all of which are applicable to this invention. Infrared and ultraviolet camera assemblies can be used for photographing printed media with anti-counterfeiting printing. Further descriptions of these features are omitted here; only the visible light camera assembly is described as an example.

[0027] The auxiliary lighting 302 can be any known lighting material, and all are applicable to this invention. Further description of these features is omitted here, and only a visible light LED is described as an example.

[0028] Preferably, such as Figure 1 As shown, only one set of camera components 104 is used; the number and type of camera components 104 can be increased as needed. Figure 1 , 2 As shown in Figures 3 and 4, the main control circuit assembly 404 constructs a signal for the shooting command and transmits it to the camera assembly 104 via the printhead data link 414, the camera assembly of the 3D curved surface inkjet printing device connected thereto, the external contact point 112 of the inkjet printhead assembly structure 100, and the internal circuit 208. The camera assembly 104 captures an image of the 3D curved surface printing medium 418 and constructs a signal, which is then transmitted back to the main control circuit assembly 404 via the internal circuit 208, the external contact point 112, and the printhead data link 414 connected thereto.

[0029] The displacement sensor 108 can be any known displacement sensor, and all are applicable to this invention. Further description of these features is omitted here, and only a laser mouse sensor is used as an example.

[0030] Preferably, such as Figure 1As shown, in this embodiment, two displacement sensors 108 are used, and the number and type of displacement sensors 108 can be increased or decreased as needed. Figure 1 , 2 As shown in Figure 4, the displacement sensor 108 captures the displacement data of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved inkjet printing device on the 3D curved printing medium 418. The signal is constructed by the laser mouse sensor chip in the displacement sensor 108 and transmitted to the main control circuit assembly 404 through the internal circuit 208 and external contact point 112 of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved inkjet printing device and the connected printhead data link 414.

[0031] The ranging sensor 110 can be any known ranging sensor, which is applicable to this invention.

[0032] Preferably, such as Figure 1 As shown, in this embodiment, three ranging sensors 110 are used, and the number and type of ranging sensors 110 can be increased or decreased as needed. Figure 1 , 2 As shown in Figure 4, the distance sensor 110 measures the distance between the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device and the 3D curved surface printing medium 418. The obtained gap data is converted into a construction signal and transmitted to the main control circuit assembly 404 via the internal circuit 208 and external contact point 112 of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device and the connected printhead data link 414.

[0033] The accelerometer 202 can be any known accelerometer, which is applicable to this invention.

[0034] Preferably, such as Figure 1 , 2 As shown in Figure 4, in this embodiment, accelerometers 202 are installed at more than 100 points on the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device. The accelerometers 202 measure the motion state of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device, obtain physical space acceleration data, convert the obtained data into construction signals, and transmit them to the main control circuit assembly 404 via the internal circuit 208 and external contact point 112 of the camera assembly and inkjet printhead assembly structure 100 and the connected printhead data link 414.

[0035] The angular velocity sensor 204 can be any known angular velocity sensor, which can be used in this invention.

[0036] Preferably, such as Figure 1 , 2 As shown in Figure 4, in this embodiment, angular velocity sensors 204 are installed at more than 100 points on the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device. The angular velocity sensors 204 measure the motion state of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device, obtain physical space rotational angular velocity data, convert the obtained data into construction signals, and transmit them to the main control circuit assembly 404 through the internal circuit 208 and external contact point 112 of the camera assembly and inkjet printhead assembly structure 100 and the connected printhead data link 414.

[0037] Accelerometer 202 and angular velocity sensor 204 can be combined. Any known components of an accelerometer or angular velocity sensor can be used in this invention.

[0038] The gravity sensor 206 can be any known gravity sensor, which can be used in this invention.

[0039] Preferably, such as Figure 1 , 2 As shown in Figure 4, in this embodiment, gravity sensors 206 are installed at more than 100 points on the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device. The gravity sensors 206 measure the attitude of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device, obtain physical space gravity magnetic field data, convert the obtained data into construction signals, and transmit them to the main control circuit assembly 404 through the internal circuit 208 and external contact point 112 of the camera assembly and inkjet printhead assembly structure 100 and the connected printhead data link 414.

[0040] Accelerometer 202, angular velocity sensor 204, and gravity sensor 206 can be combined. Any known components of an accelerometer, angular velocity sensor, or gravity sensor can be used in this invention.

[0041] Alternatively, the main control circuit assembly 404 and the printhead assembly drive circuit can be combined with the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device to form a single structure containing the camera assembly, inkjet printhead assembly, printhead drive circuit and main control circuit assembly.

[0042] The camera assembly and inkjet printhead assembly structure 100 motion mechanism and printing media motion mechanism of the 3D curved surface inkjet printing device can be designed according to known principles and are all applicable to this invention. Further description of these features is omitted here, and only other electric modules 410 are used as examples instead of description.

[0043] Preferred, such as Figure 5 The diagram shown is a flowchart of the workflow of a 3D curved surface inkjet printing device.

[0044] Acquire 3D model data, printing information, background graphic information, and positioning information from the computer system (host computer) 502. For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, the computer system 402 (host computer) transmits the construction signals of the 3D model data of the printing medium, printing information, background graphic information, and positioning information to the main control circuit component 404 via a wired or wireless data link 412. The background graphic information includes all or part of the graphic information already present on the printing medium before this printing. The positioning information can be one of the patterns, icons, tables, text, or colors in the background graphic, or it can be a partial or complete combination of patterns, icons, tables, text, or colors. There may be more than one location for positioning information. Each location is unique within the background graphic information. The positioning information contains three or more feature descriptors. The positioning information has directional orientation due to the use of patterns, icons, tables, text, or color information. The printing information includes the printing content (including patterns, icons, tables, text, or colors), and the positional relationship between the printing position and the positioning information.

[0045] The driving circuit, camera assembly motion mechanism, and printing media motion mechanism move to take pictures row by row and column by column, capturing 2D images (504). Figure 1 , 2 As shown in Figures 3 and 4, in this embodiment, the main control circuit component 404 constructs a signal, which, through the drive circuit 406, drives the camera component and inkjet printhead assembly structure 100 motion mechanism and the 3D curved surface printing medium 418 motion mechanism of the other electric modules 410 to generate movement. Based on the printing range of the 3D curved surface inkjet printing device, and according to the height and width of the camera component 104 of the camera component and inkjet printhead assembly structure 100, the camera component 104 takes pictures row by row and column by column, capturing 2D images to generate a construction signal, which is then transmitted back to the main control circuit component 404 through the printhead data link 414.

[0046] Using multi-view diffusion and other models, a 3D scene estimation model is obtained from the 2D image. Based on the current camera pose, information such as the 2D image, depth map, and point cloud trajectory of the printed medium is reconstructed 506. Figure 1 , 2As shown in Figure 4, in this embodiment, the main control circuit component 404 obtains a 3D scene estimation model by using multiple 2D images captured by the camera component 104, and employing projection geometry monocular depth estimation (MMDE), multi-view diffusion, and other known models to prioritize accurate geometric reconstruction. Based on the current camera pose, it then reconstructs the 2D images, depth maps, point cloud trajectories, and other information of the 3D curved printing medium 418.

[0047] The feature descriptors of the 2D image and the location information are matched to determine the location information, obtaining the location, orientation, and 3D position data (508). For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, the main control circuit component 404 matches the feature descriptors in the 2D image obtained from the reconstructed 3D curved surface printing medium 418 with the feature descriptors of the positioning information. If the match is successful, the positioning information is determined, and information such as positioning, orientation, and 3D position data is obtained.

[0048] 3D scene estimation model, positioning information, background graphic information, printed information, and confirmation of unprinted information (510). For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, the main control circuit component 404, based on the 3D scene estimation model and positioning information of the 3D curved surface printing medium 418, reconstructs the 2D image of the 3D curved surface printing medium 418 according to the current camera pose and matches the feature descriptors in the 2D image with the feature descriptors of the background graphic information and the printing information, respectively, marks the printed information, and confirms the printed information that has not yet been printed.

[0049] Plan the printing scheme 512. (For example...) Figure 1 , 2 As shown in Figure 4, in this embodiment, the main control circuit component 404 plans the printing scheme based on the 3D model data, positioning information, and background graphic information of the printing medium, and according to the printing information that has not yet been printed.

[0050] The drive mechanism for the inkjet printhead assembly and the printing media mechanism moves the inkjet printhead assembly to position 514 where the printing information is printed. For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, the main control circuit component 404 determines the position of the information to be printed based on the planned printing scheme and the 3D scene estimation model of the 3D curved surface printing medium 418. Based on the current position and the printing position, as well as the relative positional difference between the inkjet printhead component 102 and the camera component 104, the main control circuit component 404 constructs a signal and transmits it to the drive circuit 406. This drives the camera component and inkjet printhead component structure 100 motion mechanism and the printing medium motion mechanism of the 3D curved surface inkjet printing device in other electric modules 410 to move to the position of the printed information.

[0051] like Figure 1 , 2 As shown in Figure 4, in this embodiment, the main control circuit component 404 converts the current printing content in the printing information, including the printed patterns, icons, tables, text or colors, into countable and triggerable signals for the displacement sensor 108.

[0052] Adjust the gap between the inkjet printhead assembly and the printing media to the working range of 516. For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, the main control circuit component 404 converts the gap data returned by the distance sensor 110 into an electrical signal to adjust the gap between the inkjet printhead component 102 and the 3D curved printing medium 418, and adjusts the inkjet printhead component 102 to the printable working range.

[0053] The sensing element and magnetic element calculate and correct the driving parameters of the inkjet printhead assembly, and the printhead selects the nozzle to eject ink droplets 518. For example... Figure 1 , 2 As shown in Figure 4, the main control circuit component 404 converts the initial velocity and initial direction of motion of the camera component and inkjet printhead component structure 100 of the 3D curved surface inkjet printing device into the movement direction and velocity data of the camera component and inkjet printhead component structure 100 relative to the physical space based on the physical space acceleration data obtained by the accelerometer 202 and the physical space rotational angular velocity data obtained by the angular velocity sensor component 204.

[0054] like Figure 1 , 2 As shown in Figure 4, the main control circuit component 404, based on the 3D scene estimation model of the 3D curved surface printing medium 418 and the displacement data transmitted back by the displacement sensor 108, converts the moving direction and speed data of the camera component and inkjet printhead component structure 100 of the 3D curved surface inkjet printing device relative to the 3D curved surface printing medium 418.

[0055] like Figure 1 , 2 As shown in Figure 4, the main control circuit assembly 404 calculates the driving parameters of the inkjet printhead assembly 102 based on the moving direction and speed data of the camera assembly and inkjet printhead assembly structure 100 of the 3D curved surface inkjet printing device relative to the physical space, the physical space gravity magnetic field data obtained by the gravity sensor 206, and the gap data obtained by the distance sensor 110, according to known principles.

[0056] like Figure 1 , 2As shown in Figure 4, the main control circuit component 404 corrects the driving parameters of the inkjet printhead component 102, namely the ink droplet trajectory and final landing point, based on the moving direction and speed data of the camera component and inkjet printhead component structure 100 of the 3D curved surface inkjet printing device relative to the printing medium.

[0057] like Figure 1 , 2 As shown in Figure 4, other sensors 408 generate signals, which are transmitted to the main control circuit component 404 via the data link 416 of other sensor circuits.

[0058] like Figure 1 , 2 As shown in Figure 4, the main control circuit assembly 404 selects a suitable nozzle and transmits the electro-jet construction signal through the drive circuit 406 and the camera assembly and inkjet printhead assembly structure 100 external contact point 112 and internal circuit 208 of the 3D curved surface inkjet printing device connected thereto to the selected nozzle on the inkjet printhead assembly 102 to eject ink droplets, thus "printing" the printed content (including patterns, icons, tables, text or colors, etc.) onto the 3D curved surface printing medium 418.

[0059] The inkjet printhead assembly motion mechanism and the printing media motion mechanism 520 are driven again. For example... Figure 1 , 2 As shown in Figure 4, in this embodiment, if the printing content is not completed, the main control circuit component 404 constructs a signal again, which drives the camera component and inkjet printhead component structure 100 motion mechanism and printing medium motion mechanism of the 3D curved surface inkjet printing device in other electric modules 410 to move through the drive circuit 406, triggering the displacement sensor 108 to send the construction signal back to the main control circuit component 404 again.

[0060] This invention discloses a 3D curved surface inkjet printing device, comprising: a camera assembly facing the printing medium; an inkjet printhead assembly facing the printing medium; and a main control circuit assembly that controls the camera assembly to capture images and analyzes and identifies the images with positioning information, background image information, and printing information, and then controls the inkjet printhead assembly to print on the printing medium. It also includes sensing elements and magnetic elements. This enables the 3D curved surface inkjet printing device to perceive the 3D curved surface printing medium and its surface. By comparing and identifying the information with positioning information, background image information, and printing information, it can automatically plan the printing scheme without prior manual intervention or / and adjustment, saving labor costs, material costs, and time costs, and improving the user experience.

[0061] The above description uses specific terminology for illustrative purposes to provide a thorough understanding of the invention. However, it will be apparent to those skilled in the art that specific details are not required for carrying out the invention. Therefore, the above description of specific embodiments of the invention is for illustrative and descriptive purposes only and is not intended to be exhaustive or to limit the invention to the precise forms disclosed. It will be apparent to those skilled in the art that many modifications and variations are possible in light of the above teachings.

[0062] These embodiments were chosen and described in order to best illustrate the principles of the invention and its practical application, thereby enabling others skilled in the art to best utilize the invention and various embodiments with modifications suitable for the contemplated specific uses. The scope of the invention is defined by the following claims and their equivalents.

[0063] Although embodiments have been described with reference to several specific examples, modifications, arrangements, and equivalents exist that fall within the scope of these general concepts. It should be noted that many alternative ways of implementing the methods and apparatus of these embodiments exist. Therefore, it is intended that the appended claims be construed as including all such modifications, arrangements, and equivalents that fall within the true spirit and scope of the described embodiments.

Claims

1. A 3D curved surface inkjet printing apparatus, comprising: The camera assembly is oriented towards the printing medium. Inkjet printhead assembly, facing the printing medium; The main control circuit assembly controls the camera assembly to capture images, and analyzes and identifies the location information, background image information, and printing information, and then controls the inkjet printhead assembly to print on the printing medium.

2. The inkjet printing apparatus for 3D curved surfaces according to claim 1, further comprising: A sensing element located on the camera assembly and inkjet printhead assembly structure is configured to detect the state of the structure, and the sensing element is coupled to the main control circuit assembly.

3. The inkjet printing apparatus for 3D curved surfaces according to claim 1, further comprising: A magnetic element located on the structure of the camera assembly and inkjet printhead assembly provides a magnetic field that can be detected by the sensing element and is coupled to the main control circuit assembly.

4. The inkjet printing apparatus for 3D curved surfaces according to claim 1, wherein, The main control circuit component acquires the 3D model data, printing information, background graphic information and positioning information of the printing medium from the computer system (host computer), wherein the positioning information contains more than three feature descriptors.

5. The inkjet printing apparatus for 3D curved surfaces according to claim 1, wherein, The main control circuit component captures multiple 2D images of the 3D curved printing medium through the camera component, uses monocular depth estimation (MMDE) based on projection geometry, and employs multi-view diffusion and other known models to prioritize accurate geometric reconstruction to obtain a 3D scene estimation model.

6. The method according to claims 1 and 5, wherein, The main control circuit component reconstructs information such as 2D images, depth maps, and point cloud trajectories of the 3D curved surface printing medium based on the current camera pose.

7. The method according to claims 1, 4, 5, and 6, wherein, The main control circuit component matches the feature descriptors in the 2D image of the current camera pose obtained by reconstructing the 3D curved printing medium with the feature descriptors of the positioning information to determine the positioning information and obtain positioning, orientation and 3D position data.

8. The method according to claims 1, 4, 6, and 7, wherein, The main control circuit component plans the printing scheme based on the 3D model data, positioning information, and background graphic information of the printing medium, as well as the printing information that has not yet been printed.

9. The method according to claims 1, 5, and 8, wherein, The main control circuit component determines the location of the information to be printed based on the planned printing scheme and the 3D scene estimation model of the 3D curved surface printing medium.

10. The method according to claims 1, 2, and 3, wherein, The main control circuit assembly calculates and corrects the driving parameters of the inkjet printhead assembly based on the sensing element and magnetic element, and the printhead selects the nozzle to eject ink droplets.

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