Liquid spray nozzle detection apparatus and method
Patent Information
- Application Number
- CN202510370448.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-25
- Publication Date
- 2026-09-29
AI Technical Summary
[0003]但目前对平面显示装置进行生产加工的设备的作业质量有待提升
[0007]根据本申请实施例提供的方案，通过采用包括第一图像采集器、第二图像采集器和控制单元的喷液嘴检测装置，可以通过控制单元控制第一图像采集器和第二图像采集器移动，直至在理想出液方向上，第一图像采集器与待检测喷液嘴的间距等于第二图像采集器与待检测喷液嘴的间距，且第一图像采集器与待检测喷液嘴沿第一方向的间距等于第二图像采集器与待检测喷液嘴沿第二方向的间距；然后可以在待检测喷液嘴以固定频率射出液滴的过程中，控制第一图像采集器和第二图像采集器在同一时间分别进行图像采集，以使第一图像采集器采集到第一图像，并使第二图像采集器采集到第二图像；最后可以根据第一图像和第二图像确定待检测喷液嘴的喷液数据，以使工作人员可以根据喷液数据确定待检测喷液嘴是否异常。由此，由于第一图像和第二图像均包括待检测喷液嘴射出的多个液滴的图像，且第一图像由第一图像采集器采集得到，第二图像由第二图像采集器采集得到，因此可以通过多个角度的待检测喷液嘴射出的液滴的图像实现对待检测喷液嘴的状态监测，并可以在待检测喷液嘴异常时及时采用关闭该待检测喷液嘴等手段进行处理，提高待检测喷液嘴所在的打印头的喷墨质量，还提高了打印设备的作业质量。
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Figure CN122835686A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of equipment testing, and more particularly to a nozzle testing device and method. Background Technology
[0002] Organic light-emitting diodes (OLEDs) and flat panel displays based on light-emitting diodes (LEDs) are widely used in various consumer electronics products such as mobile phones, televisions, laptops, and desktop computers due to their advantages such as high image quality, energy saving, thin body, and wide range of applications, becoming the mainstream of display devices.
[0003] However, the operational quality of equipment used for manufacturing flat panel display devices needs to be improved. Summary of the Invention
[0004] In view of this, embodiments of this application provide a display panel and a display terminal to at least partially solve the above-mentioned problems.
[0005] According to a first aspect of the present application, a nozzle detection device is provided, comprising: a first image acquisition unit, a second image acquisition unit, and a control unit; the first image acquisition unit and the second image acquisition unit are located below a nozzle to be detected, which is vertically downward, wherein the optical axis of the first image acquisition unit is perpendicular to a first virtual plane, the optical axis of the second image acquisition unit is perpendicular to a second virtual plane, the first virtual plane and the second virtual plane are both parallel to the ideal liquid discharge direction of the nozzle to be detected, and the first virtual plane and the second virtual plane are perpendicular to each other; the control unit is connected to the first image acquisition unit and the second image acquisition unit, and is used to control the movement of the first image acquisition unit and the second image acquisition unit, such that, in the ideal liquid discharge direction, the distance between the first image acquisition unit and the nozzle to be detected is equal to the distance between the second image acquisition unit and the nozzle to be detected, and the distance between the first image acquisition unit and the nozzle to be detected along a first direction is equal to the distance between the second image acquisition unit and the nozzle to be detected along a second direction, wherein the first direction is parallel to the optical axis of the first image acquisition unit, and the second direction is parallel to the optical axis of the second image acquisition unit.
[0006] According to a second aspect of the embodiments of this application, a method for detecting a spray nozzle is provided, comprising: controlling a control unit included in the spray nozzle detection device to move a first image acquisition unit and a second image acquisition unit included in the spray nozzle detection device, such that, in an ideal liquid discharge direction of a vertically downward-positioned spray nozzle to be detected, the distance between the first image acquisition unit and the spray nozzle to be detected is equal to the distance between the second image acquisition unit and the spray nozzle to be detected, and the distance between the first image acquisition unit and the spray nozzle to be detected along a first direction is equal to the distance between the second image acquisition unit and the spray nozzle to be detected along a second direction, wherein both the first image acquisition unit and the second image acquisition unit are located below the spray nozzle to be detected, and the light from the first image acquisition unit... The optical axis of the first image acquisition device is perpendicular to the first virtual plane, and the optical axis of the second image acquisition device is perpendicular to the second virtual plane. Both the first and second virtual planes are parallel to the ideal liquid discharge direction of the nozzle to be tested, and the first and second virtual planes are perpendicular to each other. The first direction is parallel to the optical axis of the first image acquisition device, and the second direction is parallel to the optical axis of the second image acquisition device. At the same time as controlling the nozzle to be tested to eject droplets at a fixed frequency, the first image acquisition device is controlled to acquire a first image, and the second image acquisition device is controlled to acquire a second image. The first and second images are acquired, and the liquid discharge data of the nozzle to be tested is determined based on the first and second images.
[0007] According to the solution provided in the embodiments of this application, by employing a nozzle detection device including a first image acquisition unit, a second image acquisition unit, and a control unit, the control unit can control the movement of the first and second image acquisition units until, in the ideal liquid discharge direction, the distance between the first image acquisition unit and the nozzle to be detected is equal to the distance between the second image acquisition unit and the nozzle to be detected, and the distance between the first image acquisition unit and the nozzle to be detected along the first direction is equal to the distance between the second image acquisition unit and the nozzle to be detected along the second direction. Then, during the process of the nozzle to be detected ejecting droplets at a fixed frequency, the first and second image acquisition units can be controlled to acquire images simultaneously, so that the first image acquisition unit acquires a first image and the second image acquisition unit acquires a second image. Finally, the liquid discharge data of the nozzle to be detected can be determined based on the first and second images, so that the operator can determine whether the nozzle to be detected is abnormal based on the liquid discharge data. Therefore, since both the first and second images include images of multiple droplets ejected from the nozzle under test, and the first image is acquired by the first image acquisition device and the second image is acquired by the second image acquisition device, the status of the nozzle under test can be monitored by images of droplets ejected from the nozzle under test from multiple angles. When the nozzle under test is abnormal, measures such as shutting down the nozzle under test can be taken in time to improve the inkjet quality of the print head where the nozzle under test is located, and also improve the operation quality of the printing equipment. Attached Figure Description
[0008] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings.
[0009] Figure 1 This is a schematic diagram of a nozzle detection device according to an embodiment of this application;
[0010] Figure 2 This is a schematic diagram of the first image of an embodiment of this application;
[0011] Figure 3 yes Figure 2 A magnified view of the droplet m in the image;
[0012] Figure 4 This is a schematic diagram of a second image according to an embodiment of this application.
[0013] Explanation of reference numerals in the attached figures:
[0014] 1. First image acquisition device; 2. Second image acquisition device. Detailed Implementation
[0015] To enable those skilled in the art to better understand the technical solutions in the embodiments of this application, the technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art should fall within the protection scope of the embodiments of this application.
[0016] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used in the embodiments of this application refers to and includes any or all possible combinations of one or more associated listed items.
[0017] It should be understood that in the description of the embodiments of this application, the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing the scheme of the embodiments of this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of this application.
[0018] Furthermore, when an element or layer is referred to as being "on" another element or layer, "connected to," or "bonded to" another element or layer, the element or layer may be directly on the other element or layer, directly connected to, or directly bonded to the other element or layer, or there may be intermediate elements or layers. However, when an element or layer is referred to as being "directly on" another element or layer, "directly connected to," or "directly bonded to" another element or layer, there are no intermediate elements or layers.
[0019] The terms First, Second, etc., are used to describe various elements, components, regions, layers, and / or parts, but these elements, components, regions, layers, and / or parts should not be limited by these terms. These terms are used to distinguish one element, component, region, layer, and / or part from another element, component, region, layer, and / or part.
[0020] Unless otherwise expressly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0021] The specific implementation of the embodiments of this application will be further described below with reference to the accompanying drawings.
[0022] This application provides a nozzle detection device for detecting the spraying state of a vertically downward-facing nozzle to be tested. For example, the nozzle to be tested can be any nozzle on the print head of a printing device used in the fabrication of a flat panel display device (the print head generally has multiple nozzles, which can be arranged in an array). Based on this, after the substrate of the flat panel display device is vapor-deposited by a vapor deposition machine, the vapor-deposited substrate can be encapsulated, and then inkjet printing can be performed by a printing device, thus realizing at least part of the fabrication process of the flat panel display device. When the flat panel display device is not fabricated using a printing device, the spraying state of the nozzle to be tested can be detected by the nozzle detection device to detect any abnormalities in a timely manner.
[0023] Figure 1 This is a schematic diagram of a nozzle detection device according to an embodiment of this application. Figure 1 As shown, the nozzle detection device includes a first image acquisition unit 1, a second image acquisition unit 2, and a control unit. The first image acquisition unit 1 and the second image acquisition unit 2 are located below the nozzle to be detected, which is vertically downward. The optical axis of the first image acquisition unit 1 is perpendicular to a first virtual plane, and the optical axis of the second image acquisition unit 2 is perpendicular to a second virtual plane. Both the first and second virtual planes are parallel to the ideal liquid discharge direction of the nozzle to be detected, and the first and second virtual planes are perpendicular to each other. The control unit is connected to the first image acquisition unit 1 and the second image acquisition unit 2, and is used to control the movement of the first image acquisition unit 1 and the second image acquisition unit 2, so that in the ideal liquid discharge direction, the distance between the first image acquisition unit 1 and the nozzle to be detected is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected, and the distance between the first image acquisition unit 1 and the nozzle to be detected along a first direction is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected along a second direction, wherein the first direction is parallel to the optical axis of the first image acquisition unit 1, and the second direction is parallel to the optical axis of the second image acquisition unit 2.
[0024] In one specific embodiment, the ideal liquid outlet direction of the nozzle to be tested can be on a first virtual plane and on a second virtual plane, for example... Figure 1 As shown, the first virtual plane xoz and the second virtual plane yoz are two virtual planes determined according to a virtual spatial rectangular coordinate system. The optical axis of the first image acquisition device 1 is perpendicular to the first virtual plane xoz, and the optical axis of the second image acquisition device 2 is perpendicular to the second virtual plane yoz. The origin o of the spatial rectangular coordinate system is located at the nozzle of the nozzle to be detected. Since the nozzle to be detected is set vertically downward, the ideal liquid outlet direction of the nozzle to be detected is vertically downward. For example, the ideal liquid outlet direction is as follows: Figure 1 The positive direction of the z-axis in the diagram is used, but the diameter of the droplets ejected from the nozzle under test is usually small (e.g., on the micrometer scale). This makes the actual discharge direction of the nozzle easily affected by the surrounding environment, meaning the actual discharge direction is tilted relative to the ideal discharge direction. For example, the actual discharge direction... Figure 1 The direction 'a' in the middle is based on this:
[0025] The control unit (e.g., may include a controller) can control the movement of the first image acquisition unit 1 and the second image acquisition unit 2 so that, in the ideal liquid dispensing direction, the distance between the first image acquisition unit 1 and the nozzle to be detected is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected, and the first image acquisition unit 1 and the nozzle to be detected are aligned along a first direction (e.g., ...). Figure 1 The spacing in direction b) is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected along the second direction (e.g., ...). Figure 1 The spacing in direction c).
[0026] In the process of using the nozzle detection device, the control unit first controls the movement of the first image acquisition unit 1 and the second image acquisition unit 2 until, in the ideal liquid discharge direction, the distance between the first image acquisition unit 1 and the nozzle to be tested is equal to the distance between the second image acquisition unit 2 and the nozzle to be tested, and the distance between the first image acquisition unit 1 and the nozzle to be tested along the first direction is equal to the distance between the second image acquisition unit 2 and the nozzle to be tested along the second direction. Then, the working mode of the printing equipment can be adjusted so that the nozzle to be tested ejects droplets at a fixed frequency. During the process of the nozzle to be tested ejecting droplets at a fixed frequency, the first image acquisition unit 1 and the second image acquisition unit 2 are controlled to acquire images at the same time, so that the first image acquisition unit 1 acquires a first image and the second image acquisition unit 2 acquires a second image. Both the first image and the second image include images of multiple droplets ejected by the nozzle to be tested. Finally, the liquid discharge data of the nozzle to be tested can be determined based on the first image and the second image, so that the operator can determine whether the nozzle to be tested is abnormal based on the liquid discharge data, thus realizing the status monitoring of the nozzle to be tested.
[0027] In this embodiment, a nozzle detection device comprising a first image acquisition unit 1, a second image acquisition unit 2, and a control unit is employed. The control unit controls the movement of the first image acquisition unit 1 and the second image acquisition unit 2 until, in the ideal liquid discharge direction, the distance between the first image acquisition unit 1 and the nozzle to be detected is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected, and the distance between the first image acquisition unit 1 and the nozzle to be detected along the first direction is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected along the second direction. Then, during the process of the nozzle to be detected ejecting droplets at a fixed frequency, the first image acquisition unit 1 and the second image acquisition unit 2 are controlled to acquire images simultaneously, so that the first image acquisition unit 1 acquires a first image and the second image acquisition unit 2 acquires a second image. Finally, the liquid discharge data of the nozzle to be detected can be determined based on the first and second images, so that the operator can determine whether the nozzle to be detected is abnormal based on the liquid discharge data. Therefore, since both the first and second images include images of multiple droplets ejected from the nozzle to be detected, and the first image is acquired by the first image acquisition device 1 and the second image is acquired by the second image acquisition device 2, the status of the nozzle to be detected can be monitored through images of droplets ejected from the nozzle to be detected from multiple angles. When the nozzle to be detected is abnormal, measures such as shutting down the nozzle to be detected can be taken in time to improve the inkjet quality of the print head where the nozzle to be detected is located, and also improve the operation quality of the printing equipment.
[0028] The nozzle to be tested is any nozzle installed on the print head of the printing equipment used in the manufacturing process of a flat panel display device, and the aforementioned droplets are ink droplets. Based on this:
[0029] In one related technology, inkjet printing is applied to an observation film, and then a camera is used to photograph the image to observe whether ink droplets are ejected from the nozzle under test. Compared to this application, the related technology can only determine whether ink is ejected, but cannot determine the state of the ink droplets. In another related technology, the ink ejection data of the nozzle under test can be viewed from a single angle, but the ink droplets actually fall in three-dimensional space. Therefore, this method cannot measure more relevant data and cannot accurately measure the actual state of the ink droplets. Therefore, compared to the above two related technologies, this application can monitor the state of the nozzle under test more comprehensively. This allows for more timely handling of abnormalities in the nozzle under test, such as shutting down the nozzle, further improving the ink ejection quality of the printhead where the nozzle under test is located, and further improving the operational quality of the printing equipment.
[0030] In one possible implementation, the nozzle detection device further includes a processing unit, which may include a processor, etc., and this application embodiment does not limit this; the processing unit is connected to the first image acquisition device 1 and the second image acquisition device 2, and is used to acquire the first image acquired by the first image acquisition device 1 and the second image acquired by the second image acquisition device 2, and determine the spraying data of the nozzle to be detected based on the first image and the second image, wherein the first image and the second image are acquired at the same time during the process of controlling the nozzle to be detected to eject droplets at a fixed frequency, and both the first image and the second image include images of multiple droplets ejected by the nozzle to be detected.
[0031] In this embodiment of the application, after the first image acquisition device 1 acquires the first image and the second image acquisition device 2 acquires the second image, the processing unit can obtain the first image and the second image, and determine the spraying data of the nozzle to be detected based on the first image and the second image. Thus, the spraying data of the nozzle to be detected can be automatically determined based on the first image and the second image, thereby improving efficiency.
[0032] In one possible implementation, the processing unit is configured to determine, based on the first image and the second image, the volume of the plurality of droplets, and / or determine the target distance between the first droplet ejected by the nozzle to be detected and the nozzle to be detected, and / or determine the target velocity of the plurality of droplets ejected by the nozzle to be detected, and / or determine the deviation angle of the direction of the plurality of droplets ejected by the nozzle to be detected relative to the ideal liquid discharge direction, and determine the spraying data of the nozzle to be detected based on the volume of the plurality of droplets, the target distance, the target velocity and / or the deviation angle.
[0033] Therefore, compared to detecting the volume, target spacing, target velocity, or deviation angle of multiple droplets ejected from the nozzle under test from a single angle, the embodiments of this application determine the volume, target spacing, target velocity, or deviation angle of multiple droplets based on two images from different angles, namely the first image and the second image. This achieves comprehensive and multi-angle detection of the spraying state of the nozzle under test, thereby enabling the spraying data to more accurately reflect whether the nozzle under test is abnormal.
[0034] In one possible implementation, the formula for determining the volume of the plurality of droplets is as follows:
[0035] Vi = (4 / 3)*π*(di / 2)^3;
[0036] Where Vi is the volume of the i-th droplet ejected by the nozzle to be detected among the plurality of droplets, i≤n, n is the total number of droplets included in the plurality of droplets, and di is the diameter of the i-th droplet determined according to the first image and / or the second image.
[0037] The diameter *di* can be determined based on the image of the i-th droplet in the first image, or based on the image of the i-th droplet in the second image. Alternatively, the first diameter of the i-th droplet can be determined based on the image of the i-th droplet in the first image, and the second diameter based on the image of the i-th droplet in the second image. The average of the first diameter and the second diameter is then determined as *di*. This application does not limit the specific method for determining *di*, nor does it limit the method for determining the diameter of the droplet based on the droplet image. For example, the specific method for determining the diameter of the droplet based on the droplet image can be as follows: Figure 2 This is a schematic diagram of the first image of an embodiment of this application. Figure 3 yes Figure 2 A magnified view of the droplet m image, as shown below. Figure 2 and Figure 3 As shown, the diameter of droplet m in the first image is d, then d1 = d / k1, where k1 is the ratio of the size of the image acquired by the first image acquisition device 1 to the actual size of the image. This application does not limit the actual value of k1 or the method of determining it. Figure 2 The direction of droplet movement is shown in direction r1.
[0038] Optionally, the ratio k1 of the size of the image acquired by the first image acquisition device 1 to the actual size of the image is equal to the ratio k2 of the size of the image acquired by the second image acquisition device 2 to the actual size of the image.
[0039] In this application, the specific value of n is not limited; for example... Figure 1 In the case of n=5, for example, Figure 2 and Figure 4 ( Figure 4 (This is a schematic diagram of the second image of an embodiment of this application) where n = 7. Figure 4 The direction of droplet movement is shown in direction r2.
[0040] Therefore, by using the formula for determining droplet volume described above, droplet volume can be determined more quickly, thus improving the efficiency of determining spray data.
[0041] In one possible implementation, the formula for determining the target distance between the first droplet ejected by the nozzle to be detected and the nozzle to be detected among the plurality of droplets is as follows:
[0042] S = (X^2 + Y^2 + Z^2)^0.5;
[0043] Where S is the target spacing, and X is the spacing between the first droplet and the nozzle to be detected along a third direction, determined based on the first image. The third direction is the direction perpendicular to the ideal liquid outlet direction in the first image (e.g., Figure 2The positive direction of the x-axis in the image is given, and Y is the distance between the first droplet and the nozzle to be detected along the fourth direction, as determined by the second image. The fourth direction is the direction perpendicular to the ideal liquid outlet direction in the second image (e.g., the positive direction of the x-axis). Figure 4 The positive direction of the y-axis in the image), Z is the direction along the ideal liquid discharge direction (e.g., the direction of the first droplet and the nozzle to be detected, as determined by the first image and / or the second image). Figure 2 and Figure 4 The spacing (in the positive direction of the z-axis).
[0044] For example, if the distance between the first droplet and the nozzle to be tested along the third direction in the first image is D1, then X = D1 / k1; if the distance between the first droplet and the nozzle to be tested along the fourth direction in the second image is D2, then Y = D2 / k2; if the distance between the first droplet and the nozzle to be tested along the ideal liquid outlet direction in the first image is D3, and if the distance between the first droplet and the nozzle to be tested along the ideal liquid outlet direction in the second image is D4, then Z = D3 / k1 or D4 / k2 or (D3 / k1+D4 / k2) / 2.
[0045] Therefore, by using the above formula to determine the target spacing, the target spacing can be determined quickly, thus improving the efficiency of determining the spray data.
[0046] In one possible implementation, the formula for determining the target velocity of the plurality of droplets ejected from the nozzle to be detected is as follows:
[0047] v = f*S / (n-1);
[0048] Where v is the target velocity, f is the frequency at which the nozzle ejects the multiple droplets, S is the target spacing, and n is the total number of droplets included in the multiple droplets.
[0049] Therefore, by using the above formula to determine the target velocity, the target velocity can be determined more quickly, thus improving the efficiency of determining the spray data.
[0050] In one possible implementation, determining the deviation angle of the direction from which the plurality of droplets are ejected from the nozzle under test relative to the ideal discharge direction includes:
[0051] θ=arctan((X^2+Y^2)^0.5 / Z);
[0052] Wherein, θ is the deviation angle, X is the distance between the first droplet and the nozzle to be tested along the third direction in the first image, the third direction being the direction perpendicular to the ideal liquid outlet direction in the first image, Y is the distance between the first droplet and the nozzle to be tested along the fourth direction in the second image, the fourth direction being the direction perpendicular to the ideal liquid outlet direction in the second image, and Z is the distance between the first droplet and the nozzle to be tested along the ideal liquid outlet direction determined based on the first image and / or the second image.
[0053] Therefore, by using the above formula to determine the deviation angle, the deviation angle can be determined more quickly, thus improving the efficiency of determining the spraying data.
[0054] In one possible implementation, the spray data includes the average volume of the plurality of droplets, the target spacing, the target velocity, and / or the deviation angle.
[0055] In one specific embodiment, the spraying data includes the average volume of the plurality of droplets, the target spacing, the target velocity, and the deviation angle, and the average volume ΔV of the plurality of droplets satisfies the following formula:
[0056]
[0057] For example, with Figure 2 and Figure 4 For example, after determining V1 to V7, ΔV can be determined using the above formula, and then the spraying data can be determined as (ΔV, S, v, θ).
[0058] In one possible implementation, the first image acquisition device 1 and the second image acquisition device 2 are the same high-speed camera.
[0059] In this embodiment of the application, by employing a high-speed camera, the state of ink droplets can be detected relatively quickly and accurately.
[0060] Optionally, the field of view of the first image acquisition device 1 and the second image acquisition device 2 is accurate to the micrometer level and has relatively accurate image recognition capabilities.
[0061] Optionally, both the first image acquisition unit 1 and the second image acquisition unit 2 can be replaced with Kateeva's Remote Drop Inspection (RDI) device. Kateeva's RDI device has the advantage of using laser diffraction to identify various parameters of the ink droplet, and has the characteristics of high speed and high accuracy.
[0062] This application embodiment also provides a method for detecting a spray nozzle. The method includes: controlling a control unit within a spray nozzle detection device to move a first image acquisition unit 1 and a second image acquisition unit 2, such that, in the ideal liquid discharge direction of the vertically downward-positioned spray nozzle to be detected, the distance between the first image acquisition unit 1 and the spray nozzle to be detected is equal to the distance between the second image acquisition unit 2 and the spray nozzle to be detected, and the distance between the first image acquisition unit 1 and the spray nozzle to be detected along a first direction is equal to the distance between the second image acquisition unit 2 and the spray nozzle to be detected along a second direction. Both the first image acquisition unit 1 and the second image acquisition unit 2 are located below the spray nozzle to be detected. The optical axis of image acquisition device 1 is perpendicular to the first virtual plane, and the optical axis of the second image acquisition device 2 is perpendicular to the second virtual plane. Both the first and second virtual planes are parallel to the ideal liquid discharge direction of the nozzle to be tested, and the first and second virtual planes are perpendicular to each other. The first direction is parallel to the optical axis of the first image acquisition device 1, and the second direction is parallel to the optical axis of the second image acquisition device 2. At the same time as controlling the nozzle to be tested to eject droplets at a fixed frequency, the first image acquisition device 1 is controlled to acquire the first image, and the second image acquisition device 2 is controlled to acquire the second image. The first and second images are acquired, and the liquid discharge data of the nozzle to be tested is determined based on the first and second images.
[0063] Both the first and second images include images of multiple droplets ejected from the nozzle to be detected.
[0064] In this embodiment, the control unit of the nozzle detection device first controls the movement of the first image acquisition unit 1 and the second image acquisition unit 2, so that in the ideal liquid discharge direction of the nozzle to be detected, which is set vertically downward, the distance between the first image acquisition unit 1 and the nozzle to be detected is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected, and the distance between the first image acquisition unit 1 and the nozzle to be detected along the first direction is equal to the distance between the second image acquisition unit 2 and the nozzle to be detected along the second direction. Then, while controlling the nozzle to be detected to eject droplets at a fixed frequency, the first image acquisition unit 1 is controlled to acquire a first image, and the second image acquisition unit 2 is controlled to acquire a second image. Then, the first image and the second image are acquired, and the liquid discharge data of the nozzle to be detected is determined based on the first image and the second image. Therefore, since both the first and second images include images of multiple droplets ejected from the nozzle to be detected, and the first image is acquired by the first image acquisition device 1 and the second image is acquired by the second image acquisition device 2, the status of the nozzle to be detected can be monitored through images of droplets ejected from the nozzle to be detected from multiple angles. When the nozzle to be detected is abnormal, measures such as shutting down the nozzle to be detected can be taken in time to improve the inkjet quality of the print head where the nozzle to be detected is located, and also improve the operation quality of the printing equipment.
[0065] In one possible implementation, acquiring the first image and the second image, and determining the spray data of the nozzle to be detected based on the first image and the second image, includes:
[0066] The nozzle detection device includes a processing unit that acquires a first image from a first image acquisition unit 1 and a second image from a second image acquisition unit 2, and determines the spray data of the nozzle to be detected based on the first and second images.
[0067] In one possible implementation, determining the spray data of the nozzle to be detected based on the first image and the second image includes:
[0068] Based on the first and second images, determine the volume of the plurality of droplets, and / or determine the target distance between the first droplet ejected by the nozzle to be tested and the nozzle to be tested, and / or determine the target velocity of the plurality of droplets ejected by the nozzle to be tested, and / or determine the deviation angle of the direction of the plurality of droplets ejected by the nozzle to be tested relative to the ideal liquid discharge direction. Based on the volume of the plurality of droplets, the target distance, the target velocity and / or the deviation angle, determine the liquid spraying data of the nozzle to be tested.
[0069] In one possible implementation, the formula for determining the volume of the plurality of droplets is as follows:
[0070] Vi = (4 / 3)*π*(di / 2)^3;
[0071] Where Vi is the volume of the i-th droplet ejected by the nozzle to be detected among the plurality of droplets, i≤n, n is the total number of droplets included in the plurality of droplets, and di is the diameter of the i-th droplet determined according to the first image and / or the second image.
[0072] In one possible implementation, the formula for determining the target distance between the first droplet ejected by the nozzle to be detected and the nozzle to be detected among the plurality of droplets is as follows:
[0073] S = (X^2 + Y^2 + Z^2)^0.5;
[0074] Wherein, S is the target spacing, X is the spacing between the first droplet and the nozzle to be tested along a third direction as determined by the first image, the third direction being the direction perpendicular to the ideal liquid outlet direction in the first image, Y is the spacing between the first droplet and the nozzle to be tested along a fourth direction as determined by the second image, the fourth direction being the direction perpendicular to the ideal liquid outlet direction in the second image, and Z is the spacing between the first droplet and the nozzle to be tested along the ideal liquid outlet direction as determined by the first image and / or the second image.
[0075] In one possible implementation, the formula for determining the target velocity of the plurality of droplets ejected from the nozzle to be detected is as follows:
[0076] v = f*S / (n-1);
[0077] Where v is the target velocity, f is the frequency at which the nozzle ejects the multiple droplets, S is the target spacing, and n is the total number of droplets included in the multiple droplets.
[0078] In one possible implementation, determining the deviation angle of the direction from which the plurality of droplets are ejected from the nozzle under test relative to the ideal discharge direction includes:
[0079] θ=arctan((X^2+Y^2)^0.5 / Z);
[0080] Wherein, θ is the deviation angle, X is the distance between the first droplet and the nozzle to be tested along the third direction in the first image, the third direction being the direction perpendicular to the ideal liquid outlet direction in the first image, Y is the distance between the first droplet and the nozzle to be tested along the fourth direction in the second image, the fourth direction being the direction perpendicular to the ideal liquid outlet direction in the second image, and Z is the distance between the first droplet and the nozzle to be tested along the ideal liquid outlet direction determined based on the first image and / or the second image.
[0081] In one possible implementation, the above-mentioned spray data includes the average volume of the plurality of droplets, the target spacing, the target velocity, and / or the deviation angle.
[0082] In one possible implementation, the first image acquisition device 1 and the second image acquisition device 2 are the same high-speed camera.
[0083] It should be noted that the specific implementation method of the nozzle detection method has been described above, and will not be repeated here.
[0084] It should be noted that the nozzle detection method of this embodiment is applied to the corresponding nozzle detection device in the aforementioned device embodiment and has the beneficial effects of the corresponding device embodiment, which will not be repeated here.
[0085] The above embodiments are only used to illustrate the embodiments of this application, and are not intended to limit the embodiments of this application. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the embodiments of this application. Therefore, all equivalent technical solutions also fall within the scope of the embodiments of this application, and the patent protection scope of the embodiments of this application should be defined by the claims.
Claims
1. A nozzle detection device, characterized in that, include: First image acquisition unit, second image acquisition unit, and control unit; The first image acquisition device and the second image acquisition device are located below the vertically downward-facing nozzle to be tested. The optical axis of the first image acquisition device is perpendicular to the first virtual plane, and the optical axis of the second image acquisition device is perpendicular to the second virtual plane. Both the first virtual plane and the second virtual plane are parallel to the ideal liquid discharge direction of the nozzle to be tested, and the first virtual plane and the second virtual plane are perpendicular to each other. The control unit, connected to the first image acquisition unit and the second image acquisition unit, is used to control the movement of the first image acquisition unit and the second image acquisition unit so that, in the ideal liquid dispensing direction, the distance between the first image acquisition unit and the nozzle to be detected is equal to the distance between the second image acquisition unit and the nozzle to be detected, and the distance between the first image acquisition unit and the nozzle to be detected along a first direction is equal to the distance between the second image acquisition unit and the nozzle to be detected along a second direction, wherein the first direction is parallel to the optical axis of the first image acquisition unit, and the second direction is parallel to the optical axis of the second image acquisition unit.
2. The apparatus according to claim 1, characterized in that, The nozzle detection device also includes a processing unit; The processing unit is connected to the first image acquisition device and the second image acquisition device, and is used to acquire a first image acquired by the first image acquisition device and a second image acquired by the second image acquisition device, and determine the spraying data of the nozzle to be detected based on the first image and the second image. The first image and the second image are acquired at the same time during the process of controlling the nozzle to be detected to eject droplets at a fixed frequency. Both the first image and the second image include images of multiple droplets ejected by the nozzle to be detected.
3. The apparatus according to claim 2, characterized in that, The processing unit is configured to determine, based on the first image and the second image, the volume of the plurality of droplets, and / or determine the target distance between the first droplet ejected by the nozzle to be detected and the nozzle to be detected, and / or determine the target velocity of the nozzle to be detected ejecting the plurality of droplets, and / or determine the deviation angle of the direction of the nozzle to be detected ejecting the plurality of droplets relative to the ideal liquid discharge direction, and determine the spraying data of the nozzle to be detected based on the volume of the plurality of droplets, the target distance, the target velocity and / or the deviation angle.
4. The apparatus according to claim 3, characterized in that, The formula for determining the volume of the plurality of droplets is as follows: Vi = (4 / 3)*π*(di / 2)^3; Where Vi is the volume of the i-th droplet ejected by the nozzle to be detected among the plurality of droplets, i≤n, n is the total number of droplets included in the plurality of droplets, and di is the diameter of the i-th droplet determined according to the first image and / or the second image.
5. The apparatus according to claim 3, characterized in that, The formula for determining the distance between the first droplet ejected by the nozzle to be tested and the target of the nozzle to be tested is as follows: S = (X^2 + Y^2 + Z^2)^0.5; Wherein, S is the target spacing, X is the spacing between the first droplet and the nozzle to be tested along a third direction as determined by the first image, the third direction being the direction perpendicular to the ideal liquid outlet direction in the first image, Y is the spacing between the first droplet and the nozzle to be tested along a fourth direction as determined by the second image, the fourth direction being the direction perpendicular to the ideal liquid outlet direction in the second image, and Z is the spacing between the first droplet and the nozzle to be tested along the ideal liquid outlet direction as determined by the first image and / or the second image.
6. The apparatus according to claim 3, characterized in that, The formula for determining the target velocity of the multiple droplets ejected from the nozzle under test is as follows: v = f*S / (n-1); Where v is the target velocity, f is the frequency at which the nozzle ejects the plurality of droplets, S is the target spacing, and n is the total number of droplets included in the plurality of droplets.
7. The apparatus according to claim 3, characterized in that, Determining the deviation angle of the direction of the multiple droplets ejected from the nozzle under test relative to the ideal discharge direction includes: θ=arctan((X^2+Y^2)^0.5 / Z); Wherein, θ is the deviation angle, X is the distance between the first droplet and the nozzle to be tested along a third direction in the first image, the third direction being the direction perpendicular to the ideal liquid outlet direction in the first image, Y is the distance between the first droplet and the nozzle to be tested along a fourth direction in the second image, the fourth direction being the direction perpendicular to the ideal liquid outlet direction in the second image, and Z is the distance between the first droplet and the nozzle to be tested along the ideal liquid outlet direction determined based on the first image and / or the second image.
8. The apparatus according to claim 3, characterized in that, The spray data includes the average volume of the plurality of droplets, the target spacing, the target velocity, and / or the deviation angle.
9. The apparatus according to any one of claims 1-8, characterized in that, The first image acquisition device and the second image acquisition device are the same high-speed camera.
10. A method for detecting a liquid spray nozzle, characterized in that, include: The control unit of the nozzle detection device controls the movement of the first image acquisition unit and the second image acquisition unit, so that in the ideal liquid discharge direction of the nozzle to be detected, which is set vertically downward, the distance between the first image acquisition unit and the nozzle to be detected is equal to the distance between the second image acquisition unit and the nozzle to be detected, and the distance between the first image acquisition unit and the nozzle to be detected along the first direction is equal to the distance between the second image acquisition unit and the nozzle to be detected along the second direction. Both the first and second image acquisition units are located below the nozzle to be detected. The optical axis of the first image acquisition unit is perpendicular to the first virtual plane, and the optical axis of the second image acquisition unit is perpendicular to the second virtual plane. Both the first and second virtual planes are parallel to the ideal liquid discharge direction of the nozzle to be detected, and the first and second virtual planes are perpendicular to each other. The first direction is parallel to the optical axis of the first image acquisition unit, and the second direction is parallel to the optical axis of the second image acquisition unit. At the same time as controlling the nozzle to eject droplets at a fixed frequency, the first image acquisition device is controlled to acquire a first image, and the second image acquisition device is controlled to acquire a second image. The first image and the second image are acquired, and the spray data of the nozzle to be detected is determined based on the first image and the second image.