Nozzle state detection device, method, equipment, storage medium and program product

Abstract

The invention discloses a nozzle state detection device, method and equipment, a storage medium and a program product, and relates to the technical field of ink-jet printing.In the nozzle state detection device, a camera, a first mirror and a second mirror are sequentially arranged along a light path, and through cooperation of the camera, the first mirror, the second mirror and a corresponding micro-positioning table, the nozzle state is detected; and collecting an ink droplet image of the ink droplet ejected by the nozzle in the flying process, and analyzing the ink droplet image to obtain the nozzle state so as to complete the detection of the nozzle state. Wherein the second mirror is used as a scanning mirror, and the view field of the camera is expanded through rotation of the second mirror, so that the state of the nozzle is quickly and comprehensively inspected, and the detection time is greatly shortened; the camera is a high-resolution and high-precision camera, and the positions of the camera and the second mirror are accurately adjusted in time, so that the speed and the precision of nozzle state detection are integrally improved.

Description

Technical Field

[0001] The present application relates to the technical field of inkjet printing, and in particular to a nozzle status detection device, a nozzle status detection method, a nozzle status detection equipment, a storage medium and a computer program product. Background Art

[0002] Inkjet printing technology has broad application prospects in the production of color filters and alignment films for displays and material deposition of organic light-emitting diodes due to its advantages of simple production, low cost and strong scalability. However, unlike graphic printing, displays have extremely high requirements for the consistency of printing quality, and even a slight change in the nozzle state will lead to uneven display effects.

[0003] At present, the following technical solutions are mainly used for nozzle status detection: 1) Optical coherence-based methods use confocal or white light interference microscopy to detect the volume of solidified droplets, but they are sensitive to the substrate surface and droplet evaporation, and the measurement accuracy of flying ink droplets is limited; 2) Weight-based methods use a balance or quartz microbalance to detect the total mass of ejected droplets, but it is difficult to distinguish droplets from different nozzles. In other words, the current detection scheme has problems such as long detection time and insufficient accuracy, making it difficult to accurately and quickly detect the nozzle status. Summary of the invention

[0004] The main purpose of the present application is to provide a nozzle state detection device, a nozzle state detection method, a nozzle state detection equipment, a storage medium and a computer program product, aiming to solve the technical problem that it is difficult to accurately and quickly detect the nozzle state.

[0005] To achieve the above objectives, the present application proposes a nozzle state detection device, the nozzle state detection device comprising: A camera, a first mirror, and a second mirror are sequentially arranged along a light path, wherein the light path is mirror-reflected at the first mirror and the second mirror, respectively, and the camera collects images of ink droplets ejected from one or more nozzles at a preset height based on the light path; A first micro-positioning stage provided at the camera, for adjusting the camera to a focusing position; The second micro-positioning stage arranged at the second mirror is used to adjust the angle of the second mirror to adjust the position of the light path.

[0006] In one embodiment, the nozzle state detection device further includes: Light bar, used for ink drop backlighting; The third micro-positioning stage arranged at the light bar is used to adjust the light irradiation angle of the light bar so that the irradiation light of the light bar is perpendicular to the mirror surface of the second mirror.

[0007] In addition, to achieve the above purpose, the present application proposes a nozzle state detection method, the nozzle state detection method uses the nozzle state detection device as described above, and the method includes: Control the nozzle to eject ink droplets; The image of ink droplets ejected from one or more nozzles at a preset height is collected by using a camera, a first mirror, and a second mirror arranged in sequence along a light path; The nozzle status is analyzed through the ink drop image.

[0008] In one embodiment, the method further comprises: After the state of each nozzle under the current viewing angle of the camera is detected, the second mirror is controlled to rotate by a preset angle through the second micro-positioning stage to change the viewing angle of the camera; By changing the camera viewing angle, the status of each nozzle of the print head can be detected.

[0009] In one embodiment, the step of changing the camera viewing angle further includes: According to the angle between each nozzle and the second mirror at the latest viewing angle of the camera, the second mirror is controlled to rotate so that the ink droplets ejected by one or more nozzles at a preset height are located on the optical axis of the current light path.

[0010] In one embodiment, the method further comprises: While controlling the rotation of the second mirror so that the ink droplets ejected from the nozzle at a preset height are located on the optical axis of the current light path, obtaining a real-time angle of the second mirror after the rotation is stabilized; Based on the real-time angle, the light bar is controlled to rotate synchronously by the third micro-positioning stage so that the illumination light of the light bar is perpendicular to the mirror surface of the second mirror.

[0011] In one embodiment, the step of changing the camera viewing angle further includes: According to the imaging distance between each nozzle and the second mirror at the latest viewing angle of the camera, the camera is controlled to move so that ink droplets at a preset height ejected by one or more nozzles located on the optical axis of the current light path are located at the focus of the camera.

[0012] In addition, to achieve the above-mentioned purpose, the present application also proposes a nozzle state detection device, which includes: a memory, a processor, and a computer program stored in the memory and executable on the processor, and the computer program is configured to implement the steps of the nozzle state detection method described above.

[0013] In addition, to achieve the above-mentioned purpose, the present application also proposes a storage medium, which is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the nozzle state detection method described above are implemented.

[0014] In addition, to achieve the above-mentioned purpose, the present application also provides a computer program product, which includes a computer program, and when the computer program is executed by a processor, the steps of the nozzle state detection method described above are implemented.

[0015] One or more technical solutions proposed in this application have at least the following technical effects: In the present application, the camera, the first mirror and the second mirror are sequentially arranged along the light path, and the ink droplet images of the ink droplets ejected from the nozzle in the flight process are collected through the cooperation of the camera, the first mirror, the second mirror and the corresponding micro-positioning stage, and the nozzle state is obtained by analyzing the ink droplet image, thereby completing the detection of the nozzle state. Among them, the second mirror is used as a scanning mirror, and the rotation of the second mirror is used to expand the field of view of the camera, so as to realize a rapid and comprehensive inspection of the nozzle state, which greatly shortens the detection time; the camera uses a high-resolution and high-precision camera, and the position of the camera and the second mirror is adjusted accurately and timely, which improves the speed and accuracy of the nozzle state detection as a whole. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0017] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0018] Figure 1 A schematic diagram of a device provided for an embodiment of a nozzle state detection device of the present application; Figure 2 This is a schematic diagram of an ink drop image collected by an embodiment of a nozzle status detection device of the present application; Figure 3 A schematic diagram of a flow chart provided for an embodiment of a nozzle status detection method of the present application; Figure 4 This is a schematic diagram of angles and distances of an embodiment of the present application; Figure 5 Schematic diagram of the device structure of the hardware operating environment involved in the nozzle status detection method in the embodiment of the present application.

[0019] Description of Figure Numbers:

[0020] The purpose, features and advantages of this application will be further described in conjunction with the embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0021] It should be understood that the specific embodiments described herein are only used to explain the technical solutions of the present application and are not used to limit the present application.

[0022] In order to better understand the technical solution of the present application, a detailed description will be given below in conjunction with the accompanying drawings and specific implementation methods.

[0023] At present, inkjet printing is widely used in the manufacture of displays due to its simple manufacturing and low cost, such as the preparation of color filters for liquid crystal displays and the light-emitting layer of organic light-emitting diodes. However, inkjet printing has the problem of uneven ink droplets, which leads to color differences and uneven display "mura" on the display screen. Therefore, it is necessary to quickly and accurately detect the nozzle status of the inkjet print head to improve the printing quality.

[0024] Based on this, an embodiment of the present application provides a nozzle state detection device. In this embodiment, the nozzle state detection device includes: A camera, a first mirror, and a second mirror are sequentially arranged along a light path, wherein the light path is mirror-reflected at the first mirror and the second mirror, respectively, and the camera collects images of ink droplets ejected from one or more nozzles at a preset height based on the light path; A first micro-positioning stage provided at the camera, for adjusting the camera to a focusing position; The second micro-positioning stage arranged at the second mirror is used to adjust the angle of the second mirror to adjust the position of the light path.

[0025] In one embodiment, referring to Figure 1 , a long working distance lens with an optical magnification of 2 times and a working distance of 156 mm respectively is mounted on a 1 / 3 inch high-resolution cis-CCD camera 101 with an effective pixel of 1280 (H) × 960 (V) through a rear zoom lens 102 with a 3.5-times optical magnification.

[0026] The lens 102 is a zoom lens, and the focal length of the lens is fixed during observation and shooting to avoid inconsistent scale. The reason for using a zoom lens is that ink droplets at different distances can be captured by zooming, so as to obtain a clearer ink droplet image. Figure 2In actual use, the focal length of the lens 102 is first determined, and then the lens 102 is moved left and right. Since the focal length remains unchanged, the left and right movement of the lens 102 will not cause a change in the scale.

[0027] A first mirror 104 is arranged at a 45° angle in the optical path of the CCD camera 101, and a rotatable second mirror 105 is arranged opposite to the first mirror 104. A first step motorized rotary micro-positioning stage 106, i.e., a second micro-positioning stage, with a maximum angular velocity of 45° / s and a minimum step of 0.0001° is used to control the rotational movement of the second mirror 105.

[0028] Since the rotation of the second mirror 105 changes the distance of the object to be detected, the focus is locked by moving the CCD camera 101 through a linear electric micro-positioning stage 103 with a maximum linear speed of 20 mm / s and a minimum step of 10 nm, i.e., the first micro-positioning stage. The linear electric micro-positioning stage 103, i.e., the first micro-positioning stage, drives the imaging device to move forward and backward to keep it in the focus position when the second mirror 105 rotates.

[0029] At present, a simple motion axis and an operating table without vibration reduction and anti-shake measures are often used, and the vibration caused during movement will also cause the final image to become blurred. In this embodiment, a stepper motor and a micro-positioning table are used to avoid the degradation of imaging quality caused by the vibration of related components during movement, and further ensure the clarity of the collected image.

[0030] During the detection process, the nozzle remains stationary, and only the second mirror 105 and the CCD camera 101 need to be rotated, thereby preventing the nozzle from colliding with the lens 102 during movement.

[0031] The first mirror 104 is fixedly set at an angle of 45° to change the light path from the CCD or CMOS imaging device, i.e., the camera 101; the rotatable second mirror 105 can be driven by a stepper motor to rotate to change the field of view of the imaging device, and its rotation angle accuracy is better than 0.0001°, and the rotation frequency can reach 45° per second.

[0032] The second mirror 105 has a large field of view of 2.4 mm (H) × 1.8 mm (V), which makes it possible to simultaneously check the time evolution of multiple droplets of multiple nozzles, that is, the state evolution of ink droplets over time during the dripping process. When the second mirror 105 scans the ink droplets ejected from the inkjet print head nozzle, because the weight of the second mirror 105 is much lighter than the CCD camera 101, the long working distance lens 102 and the auxiliary components, the delay between the rotational movements of the second mirror 105 is very small, the vibration caused by the acceleration and deceleration movement is small, and the acceleration and deceleration movement of the second mirror 105 has little effect on the ejection of the scanning piezoelectric inkjet print head nozzle, which can ensure the image clarity and minimum delay between the rotational movements of the second mirror 105. In addition, for the continuous ejection failure of several specific nozzles, such as the inability to eject ink droplets, intensive monitoring can be performed by rotating the second mirror 105. At the same time, intensive monitoring can also be performed on several specified specific nozzles.

[0033] The nozzle to be inspected is moved to the inspection position, and the lens 102 is used to form an image. The second mirror 105 rotates to change the viewing angle of the CCD camera 101 to expand the field of view, and the nozzle status is quickly and comprehensively inspected. In this way, the rotation of the second mirror 105 and the movement of the camera 101 are controlled to scan and image the ink droplets of all nozzles of the nozzle. In fact, the status inspection of 256 nozzles can be completed within 10 seconds, which greatly shortens the inspection time.

[0034] about Figure 1 The nozzle 107 in the figure has a nozzle mounting and fixing component on the right side of the left "L" shape, and a nozzle array below the left "L" shape. The ejected ink droplets drip vertically from top to bottom. The ink droplet image at the specified height, i.e., the preset height, is photographed. The specified height is the distance between the plane position of the actual printing substrate and the nozzle. The image obtained by the photographing is the ink droplet image dripping on the actual printing substrate.

[0035] The nozzles of the nozzle 107 can be controlled to spray ink droplets one by one to detect the nozzle status with high precision, or the nozzles of the nozzle 107 can be controlled to spray ink droplets in batches to efficiently detect the nozzle status with high precision. Currently, batch spraying is actually adopted, and three nozzles in each batch spray simultaneously.

[0036] In another feasible implementation manner, the nozzle state detection device further includes: Light bar, used for ink drop backlighting; The third micro-positioning stage arranged at the light bar is used to adjust the light irradiation angle of the light bar so that the irradiation light of the light bar is perpendicular to the mirror surface of the second mirror.

[0037] In another embodiment, also referring to Figure 1In order to observe the ink droplets ejected from the nozzle 107 and improve the backlight illumination of the ink droplets, a green LED light bar 108 with a diffusion film that can rotate in real time is used to reduce the light intensity difference between the LEDs. A second stepper motorized rotary micro-positioning stage 109 with a maximum angular velocity of 90° / s and a minimum step of 0.0001° is used to control the rotation of the LED light bar 108. The angle of the LED light bar can be dynamically adjusted according to the detection requirements to ensure that the light is always perpendicular to the surface of the second mirror 105.

[0038] When working, turn on the LED light bar 108 for lighting. The configured rotation system integrates a high-precision angle sensor and a feedback control circuit, which can obtain the angle of the second mirror 105 in real time. The angle sensor detects the rotation angle of the LED light bar in real time, and adjusts the action of the rotating stepper motor through the control circuit to ensure that the light is irradiated vertically to the second mirror 105.

[0039] By rotating the LED light bar in real time, the light irradiation angle is optimized and the light is automatically adjusted to ensure that it is perpendicular to the imaging mirror surface, thereby ensuring the amount of light entering the camera 101, thereby improving the clarity and accuracy of the imaging, which is conducive to further improving the accuracy of nozzle status detection.

[0040] It should be noted that the execution subject of this embodiment may be a computing service device with data processing, network communication and program running functions, such as a tablet computer, a personal computer, a mobile phone, etc., or an electronic device capable of realizing the above functions, a nozzle state detection device, etc. The following takes the nozzle state detection device as an example to illustrate this embodiment and the following embodiments.

[0041] Based on this, the embodiment of the present application provides a nozzle state detection method, referring to Figure 3 , Figure 3 This is a flow chart of an embodiment of a nozzle status detection method of the present application.

[0042] In this embodiment, the nozzle state detection method uses the nozzle state detection device as described above, and the method includes steps S10 to S30: Step S10, controlling the nozzle to eject ink droplets; Step S20, collecting images of ink droplets ejected from one or more nozzles at a preset height by using a camera, a first mirror, and a second mirror sequentially arranged along the light path; Step S30, analyzing the ink drop image to obtain the nozzle status.

[0043] In one embodiment, a reference nozzle, i.e., the first nozzle, is set and a driving waveform is adjusted, and a nozzle controller drives the nozzle on the nozzle to eject ink droplets according to the internally set waveform parameters, so as to obtain stable ejection. The ink droplet images of ink droplets ejected from one or more nozzles at a preset height are collected by sequentially setting a camera, a first mirror, and a second mirror along the light path, and the nozzle state is obtained by analyzing the ink droplet images.

[0044] It should be noted that the nozzle state is characterized by characteristic parameter data such as ink drop volume, jetting speed, jetting angle, etc. In this embodiment, the analysis method for obtaining the nozzle state through ink drop image analysis is not limited.

[0045] In a feasible implementation manner, the method further includes: After the state of each nozzle under the current viewing angle of the camera is detected, the second mirror is controlled to rotate by a preset angle through the second micro-positioning stage to change the viewing angle of the camera; By changing the camera viewing angle, the status of each nozzle of the print head can be detected.

[0046] In one embodiment, after the state of each nozzle under the current viewing angle of the camera is detected, the second micro-positioning stage controls the second mirror to rotate a certain angle Δθ so that the CCD camera captures the ink drop image of the current latest field of view. By changing the camera viewing angle until the second mirror covers all nozzles, the state detection of each nozzle of the printhead is completed.

[0047] In a feasible implementation manner, after the step of changing the camera viewing angle, the step further includes: According to the angle between each nozzle and the second mirror at the latest viewing angle of the camera, the second mirror is controlled to rotate so that the ink droplets ejected by one or more nozzles at a preset height are located on the optical axis of the current light path.

[0048] According to the imaging distance between each nozzle and the second mirror at the latest viewing angle of the camera, the camera is controlled to move so that ink droplets at a preset height ejected by one or more nozzles located on the optical axis of the current light path are located at the focus of the camera.

[0049] In one embodiment, the nozzle array is aligned with the center of the CCD field of view, that is, the optical axis of the light path, so that the photographed ink droplets are located at the center of the lens, thereby obtaining a clear image of the ink droplets.

[0050] In another embodiment, part of the nozzle is allowed to be misaligned with the CCD optical axis, which can be compensated by adjusting the second mirror and the CCD. Figure 4, select any two nozzles m and n, and the known parameters include spray distance p, rotation angle θm, θn, lens distance lm, ln, then the angle θt and distance lx of any nozzle x can be calculated by formulas (1) and (2). According to the positions of any two nozzles, the angle and imaging distance of each nozzle in the current field of view can be calculated by formulas (1) and (2), where the nozzle angle is used to rotate the scanning mirror and adjust the field of view of the CCD, and the imaging distance is used to adjust the lens focal length, that is, to control the lens focus to compensate for the change in imaging distance.

[0051] (1) (2)

[0052]

[0053] It should be noted that the nozzle status detection process does not involve observation of the nozzle itself, but rather the nozzle status is obtained by analyzing the image of ink droplets ejected from the nozzle. In other words, the ink drop status is determined by analyzing the image of ink droplets ejected from the nozzle, and the nozzle status is further confirmed by the ink drop status.

[0054] In a feasible implementation manner, the method further includes: While controlling the rotation of the second mirror so that the ink droplets ejected from the nozzle at a preset height are located on the optical axis of the current light path, obtaining a real-time angle of the second mirror after the rotation is stabilized; Based on the real-time angle, the light bar is controlled to rotate synchronously by the third micro-positioning stage so that the illumination light of the light bar is perpendicular to the mirror surface of the second mirror.

[0055] In one embodiment, referring to Figure 1 In order to observe the ink droplets ejected from the nozzle 107 and improve the backlight illumination of the ink droplets, an LED light bar 108 with a diffusion film is used to reduce the light intensity difference between the LEDs. A second stepper motorized rotary micro-positioning stage 109 with a maximum angular velocity of 90° / s and a minimum step of 0.0001° is used to control the rotation of the LED light bar 108. The angle of the LED light bar can be dynamically adjusted according to the detection requirements to ensure that the light is always perpendicular to the surface of the second mirror 105.

[0056] When working, turn on the LED light bar 108 for lighting. The configured rotation system integrates a high-precision angle sensor and a feedback control circuit, which can obtain the angle of the second mirror 105 in real time. The angle sensor detects the rotation angle of the LED light bar in real time, and adjusts the action of the rotating stepper motor through the control circuit to ensure that the light is irradiated vertically to the second mirror 105.

[0057] By rotating the LED light bar in real time, the light irradiation angle is optimized and the light is automatically adjusted to ensure that it is perpendicular to the imaging mirror surface, thereby ensuring the amount of light entering the camera 101, thereby improving the clarity and accuracy of the imaging, which is conducive to further improving the accuracy of nozzle status detection.

[0058] It should be noted that the above examples are only used to understand the nozzle state detection method of the present application, and do not constitute a limitation on the nozzle state detection method of the present application. More simple transformations based on this technical concept are all within the protection scope of the present application.

[0059] As described above, the nozzle status detection platform and method of the present application can be used for ink drop quality assessment and nozzle screening, can be applied to the screening of various nozzles with different numbers of nozzles, and can be applied to the inkjet printing industry such as electronic manufacturing, life sciences, and additive manufacturing, etc., in addition to the display field.

[0060] The present application provides a nozzle state detection device, which includes: at least one processor; and a memory communicatively connected to the at least one processor; wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the at least one processor so that the at least one processor can execute the nozzle state detection method in the above-mentioned embodiment one.

[0061] Reference below Figure 5 , which shows a schematic diagram of the structure of a nozzle state detection device suitable for implementing the embodiment of the present application. The nozzle state detection device in the embodiment of the present application may include but is not limited to mobile terminals such as mobile phones, laptop computers, digital broadcast receivers, PDAs (Personal Digital Assistants), PADs (Portable Application Descriptions), PMPs (Portable Media Players), vehicle-mounted terminals (such as vehicle-mounted navigation terminals), etc., and fixed terminals such as digital TVs, desktop computers, etc. Figure 5 The nozzle status detection device shown is merely an example and should not bring any limitation to the functions and scope of use of the embodiments of the present application.

[0062] like Figure 5As shown, the nozzle state detection device may include a processing device 1001 (such as a central processing unit, a graphics processor, etc.), which can perform various appropriate actions and processes according to a program stored in a read-only memory (ROM: Read Only Memory) 1002 or a program loaded from a storage device 1003 to a random access memory (RAM: Random Access Memory) 1004. In RAM1004, various programs and data required for the operation of the nozzle state detection device are also stored. The processing device 1001, ROM1002 and RAM1004 are connected to each other through a bus 1005. An input / output (I / O) interface 1006 is also connected to the bus. Generally, the following systems can be connected to the I / O interface 1006: an input device 1007 including, for example, a touch screen, a touch pad, a keyboard, a mouse, an image sensor, a microphone, an accelerometer, a gyroscope, etc.; an output device 1008 including, for example, a liquid crystal display (LCD: Liquid Crystal Display), a speaker, a vibrator, etc.; a storage device 1003 including, for example, a magnetic tape, a hard disk, etc.; and a communication device 1009. The communication device 1009 can allow the nozzle status detection device to communicate with other devices wirelessly or by wire to exchange data. Although the nozzle status detection device with various systems is shown in the figure, it should be understood that it is not required to implement or have all the systems shown. More or fewer systems can be implemented or have alternatively.

[0063] In particular, according to the embodiments disclosed in the present application, the process described above with reference to the flowchart can be implemented as a computer software program. For example, the embodiments disclosed in the present application include a computer program product, which includes a computer program carried on a computer-readable medium, and the computer program includes a program code for executing the method shown in the flowchart. In such an embodiment, the computer program can be downloaded and installed from a network through a communication device, or installed from a storage device 1003, or installed from a ROM 1002. When the computer program is executed by the processing device 1001, the above-mentioned functions defined in the method of the embodiment disclosed in the present application are executed.

[0064] The nozzle state detection device provided by the present application adopts the nozzle state detection method in the above embodiment, which can solve the technical problem of difficulty in accurately and quickly detecting the nozzle state. Compared with the prior art, the beneficial effects of the nozzle state detection device provided by the present application are the same as the beneficial effects of the nozzle state detection method provided by the above embodiment, and the other technical features in the nozzle state detection device are the same as the features disclosed in the method of the previous embodiment, which will not be repeated here.

[0065] It should be understood that the various parts disclosed in this application can be implemented by hardware, software, firmware or a combination thereof. In the description of the above embodiments, specific features, structures, materials or characteristics can be combined in any one or more embodiments or examples in a suitable manner.

[0066] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any person skilled in the art who is familiar with the present technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

[0067] The present application provides a computer-readable storage medium having computer-readable program instructions (ie, computer programs) stored thereon, and the computer-readable program instructions are used to execute the nozzle state detection method in the above-mentioned embodiment.

[0068] The computer-readable storage medium provided in the present application may be, for example, a USB flash drive, but is not limited to electrical, magnetic, optical, electromagnetic, infrared, or semiconductor systems or devices, or any combination of the above. More specific examples of computer-readable storage media may include, but are not limited to: an electrical connection with one or more wires, a portable computer disk, a hard disk, a random access memory (RAM: Random Access Memory), a read-only memory (ROM: Read Only Memory), an erasable programmable read-only memory (EPROM: Erasable Programmable Read Only Memory or flash memory), an optical fiber, a portable compact disk read-only memory (CD-ROM: CD-Read Only Memory), an optical storage device, a magnetic storage device, or any suitable combination of the above. In this embodiment, the computer-readable storage medium may be any tangible medium containing or storing a program, which may be used by or in combination with an instruction execution system or device. The program code contained on the computer-readable storage medium may be transmitted using any appropriate medium, including but not limited to: wires, optical cables, RF (Radio Frequency: Radio Frequency), etc., or any suitable combination of the above.

[0069] The computer-readable storage medium may be included in the nozzle state detection device; or may exist independently without being assembled into the nozzle state detection device.

[0070] The computer-readable storage medium carries one or more programs. When the one or more programs are executed by the nozzle status detection device, the nozzle status detection device: controls the nozzle to spray ink droplets; collects ink droplet images of ink droplets sprayed from one or more nozzles at a preset height through a camera, a first mirror, and a second mirror arranged in sequence along the light path; and obtains the nozzle status through analysis of the ink droplet image.

[0071] Computer program code for performing the operations of the present application may be written in one or more programming languages ​​or a combination thereof, including object-oriented programming languages ​​such as Java, Smalltalk, C++, and conventional procedural programming languages ​​such as "C" or similar programming languages. The program code may be executed entirely on the user's computer, partially on the user's computer, as a separate software package, partially on the user's computer and partially on a remote computer, or entirely on a remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or may be connected to an external computer (e.g., via the Internet using an Internet service provider).

[0072] The flow chart and block diagram in the accompanying drawings illustrate the possible architecture, function and operation of the system, method and computer program product according to various embodiments of the present application. In this regard, each square box in the flow chart or block diagram can represent a module, a program segment or a part of a code, and the module, the program segment or a part of the code contains one or more executable instructions for realizing the specified logical function. It should also be noted that in some alternative implementations, the functions marked in the square box can also occur in a sequence different from that marked in the accompanying drawings. For example, two square boxes represented in succession can actually be executed substantially in parallel, and they can sometimes be executed in the opposite order, depending on the functions involved. It should also be noted that each square box in the block diagram and / or flow chart, and the combination of the square boxes in the block diagram and / or flow chart can be implemented with a dedicated hardware-based system that performs a specified function or operation, or can be implemented with a combination of dedicated hardware and computer instructions.

[0073] The modules involved in the embodiments described in this application may be implemented by software or hardware, wherein the name of the module does not constitute a limitation on the unit itself in some cases.

[0074] The readable storage medium provided in this application is a computer-readable storage medium, which stores computer-readable program instructions (i.e., computer programs) for executing the above-mentioned nozzle state detection method, and can solve the technical problem of difficulty in accurately and quickly detecting the nozzle state. Compared with the prior art, the beneficial effects of the computer-readable storage medium provided in this application are the same as the beneficial effects of the nozzle state detection method provided in the above-mentioned embodiment, and will not be elaborated here.

[0075] The present application also provides a computer program product, including a computer program, which implements the steps of the nozzle state detection method as described above when executed by a processor.

[0076] The computer program product provided by this application can solve the technical problem of difficulty in accurately and quickly detecting the nozzle state. Compared with the prior art, the beneficial effects of the computer program product provided by this application are the same as the beneficial effects of the nozzle state detection method provided by the above embodiment, which will not be repeated here.

[0077] The above descriptions are only some embodiments of the present application, and are not intended to limit the patent scope of the present application. All equivalent structural changes made using the contents of the present application specification and drawings under the technical concept of the present application, or direct / indirect applications in other related technical fields are included in the patent protection scope of the present application.

Claims

1. A nozzle state detection device, characterized in that: The nozzle state detection device comprises: A camera, a first mirror, and a second mirror are sequentially arranged along a light path, wherein the light path is mirror-reflected at the first mirror and the second mirror, respectively, and the camera collects images of ink droplets ejected from one or more nozzles at a preset height based on the light path; A first micro-positioning stage provided at the camera, for adjusting the camera to a focusing position; a second micro-positioning stage provided at the second mirror, for adjusting the angle of the second mirror to adjust the position of the light path; The nozzle state detection device also includes: Light bar, used for ink drop backlighting; The third micro-positioning stage arranged at the light bar is used to adjust the light irradiation angle of the light bar so that the irradiation light of the light bar is perpendicular to the mirror surface of the second mirror.

2. A nozzle state detection method, characterized in that: The nozzle state detection method uses the nozzle state detection device as claimed in claim 1, and the method comprises: Control the nozzle to eject ink droplets; The image of ink droplets ejected from one or more nozzles at a preset height is collected by using a camera, a first mirror, and a second mirror arranged in sequence along a light path; Analyzing the ink drop image to obtain the nozzle state; The method further comprises: After the state of each nozzle under the current viewing angle of the camera is detected, the second mirror is controlled to rotate by a preset angle through the second micro-positioning stage to change the viewing angle of the camera; By changing the camera angle of view, the status of each nozzle of the print head can be detected; The step of changing the camera viewing angle further includes: According to the angle between each nozzle and the second mirror at the latest viewing angle of the camera, the second mirror is controlled to rotate so that the ink droplets ejected by one or more nozzles at a preset height are located on the optical axis of the current light path; The method further comprises: While controlling the rotation of the second mirror so that the ink droplets ejected from the nozzle at a preset height are located on the optical axis of the current light path, obtaining a real-time angle of the second mirror after the rotation is stabilized; Based on the real-time angle, the light bar is controlled to rotate synchronously by the third micro-positioning stage so that the illumination light of the light bar is perpendicular to the mirror surface of the second mirror.

3. The nozzle state detection method according to claim 2, characterized in that: The step of changing the camera viewing angle further includes: According to the imaging distance between each nozzle and the second mirror at the latest viewing angle of the camera, the camera is controlled to move so that ink droplets at a preset height ejected by one or more nozzles located on the optical axis of the current light path are located at the focus of the camera.

4. A nozzle status detection device, characterized in that: The device comprises: a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the computer program is configured to implement the steps of the nozzle state detection method according to any one of claims 2 to 3.

5. A storage medium, characterized in that: The storage medium is a computer-readable storage medium, and a computer program is stored on the storage medium. When the computer program is executed by a processor, the steps of the nozzle state detection method according to any one of claims 2 to 3 are implemented.

6. A computer program product, characterized in that The computer program product comprises a computer program, and when the computer program is executed by a processor, the steps of the nozzle state detection method according to any one of claims 2 to 3 are implemented.

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