KR100997451B1 - Ink drop measuring device and its measuring method - Google Patents

Ink drop measuring device and its measuring method Download PDF

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Publication number
KR100997451B1
KR100997451B1 KR20080097258A KR20080097258A KR100997451B1 KR 100997451 B1 KR100997451 B1 KR 100997451B1 KR 20080097258 A KR20080097258 A KR 20080097258A KR 20080097258 A KR20080097258 A KR 20080097258A KR 100997451 B1 KR100997451 B1 KR 100997451B1
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Prior art keywords
ink drop
volume
drop
ink
length
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KR20080097258A
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Korean (ko)
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KR20100037914A (en
Inventor
김상훈
김석순
김은식
김재형
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(주)유니젯
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Abstract

The present invention is installed with a light dimming unit for illuminating the ink drop and a distance (D) in the drop direction of the ink drop to shoot the irradiated ink drop has a specific resolution (R) and time difference (T) A plurality of cameras photographed with a plurality of cameras, a frame grabber for converting an analog video image signal photographed by the camera into a digital signal, and a volume calculator connected to the frame grabber to calculate a volume of ink drop. Wherein the volume calculator is configured to model an outline curve of the ink drop image photographed by each camera through a curve fitting equation and calculate the long axis length b 1 of the ink drop from the equation. (b 1) and a computing unit, for calculating a blur length (b 2) by the following equation from the ink drop image taking by the camera And mirror length (b 2) calculating section, b 2 = distance between the (V × E) / R, V ( the speed of the ink drop) = D / T, where D is the ink drop hits the respective camera. Using the ink drop long axis length (b 1 ) subtracting the calculating unit, the blurring length (b 2 ) as the long axis length (b), the contour of the ink drop is curve-fitted and modeled by the equation, and the long axis in this equation And a volume calculating section for calculating the volume of the ink drop by integrating at the center.

Description

Ink drop volume measuring device and method {INK DROP MEASURING DEVICE AND ITS MEASURING METHOD}

The present invention relates to an apparatus and a method for measuring an ink drop volume in an inkjet apparatus, and more particularly, to an apparatus and a method that can more accurately and economically measure an ink drop.

Recently, coating technology using an inkjet device is gradually expanding its use area in the field of display and PCB. As such, accurate drop volume control is essential for the application of the inkjet device in the precision field, and for this purpose, accurate measurement of the drop volume is required.

As a technique for measuring the volume of the ink drop, a method of measuring using an optical system (lighting, lens, camera) as shown in FIG. 1 is used. The ink drop ejected from the inkjet apparatus 100 is photographed by the camera 300 while being illuminated by the dimming unit 200, and then the image data is transmitted to the PC 500 through the frame grabber 400 to drop image images. Will be secured.

However, there is a problem that it is difficult to obtain a single drop image having good contrast and sharpness because ink drops having a very small size are ejected at a very high speed.

In other words, in order to shoot a high-speed drop, the exposure time should be very short, which causes the image to be considerably darker overall, which significantly lowers the contrast between the background and the drop.

In addition, the fine drop volume can only be seen by increasing the magnification of the lens, and the high magnification of the lens and the short exposure time cause blurring in the single drop image. Blurring is a drag phenomenon that occurs when a fast moving object is photographed using a camera, and has an adverse effect on estimating the original size.

To prevent blurring, a fairly short exposure time of less than 1μs is required. However, since the exposure time of the camera and the contrast ratio of the image are inversely proportional, if the exposure time is set to shorten the blurring, the image becomes very dark and the object to be measured cannot be identified.

In order to solve this problem, a method of measuring ink drop volume using a multi-drop image as shown in FIG. 2 is known.

In this method, dozens of ink drops are dropped and a drop image is captured while keeping the exposure time of the camera short. Dozens of single drop images thus obtained are superimposed into one multidrop image with increased contrast ratio, and the drop volume is measured by numerical analysis method with the processed image.

The superimposed image obtained through multidrop shows a significantly improved contrast ratio compared to the single drop image. However, in order to reproduce an accurate image of the superimposed image by the multidrop, the drop ejected from the nozzle of the inkjet head is always the same size, It must be assumed to have speed and direction of injection.

However, in reality, the size, speed, and direction of the drop may vary slightly each time a jet is caused by a minute difference in the characteristics of the nozzle and ink and the voltage level applied to the inkjet head, thereby including overlapping noise. Even if you create a multidrop image by overlapping dozens of single-drop images, there is a disadvantage that the clarity and contrast ratio fall.

In addition, since the overlap noise generated by the multidrop cannot be analyzed (analyzed), the drop volume measurement using the multidrop can reinterpret the image by approaching the change of environmentally generated drop from an average analysis point of view. do. This means that if the drop change is small, an efficient measurement result can be obtained, but if the change is increased, the measurement result becomes unreliable.

The drop volume measurement using the conventional multidrop was approached from the viewpoint of improving the contrast ratio and sharpness. However, the environmental variables causing errors in the measurement data could not be reflected in the measurement system.

As a result, the drop volume measurement apparatus using vision (camera) in inkjet equipment has a limitation in use due to unreliable measurement data, and alternatively, a 3D measurement method using a laser is used.

This method measures by analyzing the three-dimensional data obtained by scanning the ink drop formed by dropping on the flake through a laser. Although measurement data results in high reliability, it is expensive as a factory automation equipment due to the high cost for system construction and the long measurement time and plate management for accurate measurement compared to the vision measurement method.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-described problems, and it is a technical object of the present invention to provide an ink drop volume measuring apparatus and method capable of measuring ink drop volume more simply and economically and more accurately at the same time.

The present invention is to solve the above problems, an apparatus for measuring the volume of the ink drop ejected from the nozzle of the inkjet device, to illuminate the ink drop to illuminate, and to photograph the ejected irradiated ink drop A plurality of cameras are installed spaced apart from each other in the direction of the drop of the ink drop with a distance (D), and have a specific resolution (R) and are photographed with a time difference (T), and an analog image image signal captured by the camera is converted into a digital signal. A frame grabber for converting and a volume calculator configured to calculate a volume of the ink drop connected to the frame grabber, wherein the volume calculator is configured to perform curve fitting on an outline curve of the ink drop image photographed from each camera. modeled as equation and the ink drop major axis length for calculating the long axis length (b 1) of the ink drop from the equation from (b 1) Acid and, as the camera blurring length (b 2) for calculating a blur length (b 2) by the following equation from the recorded ink drop images from calculating unit, b 2 = (V × E ) / R, V (Speed of ink drop) = D / T, where D is the distance between ink drops on each camera. Using the ink drop long axis length (b 1 ) subtracting the calculating unit, the blurring length (b 2 ) as the long axis length (b), the contour of the ink drop is curve-fitted and modeled by the equation, and the long axis in this equation And a volume calculating section for calculating the volume of the ink drop by integrating at the center.

In the ink drop volume measuring apparatus of the present invention, the volume calculator further includes either or both of a background equalizer for processing shading and noise by the dimming unit and an outline processor for specifying an outline of the photographed ink drop. It is characterized by including.

In the ink drop volume measuring apparatus of the present invention, the plurality of cameras are arranged such that angles θ are formed to each other when viewed from an upper surface.

The ink drop volume measuring method of the present invention is a method for measuring the volume of the ink drop ejected from the nozzle of the ink jet apparatus, and is spaced apart at a distance in the advancing direction of the nozzle ejected from the ink jet and has a specific resolution (R). Photographing ink drops with a specific time difference T at a specific exposure time E of the camera (S10); Calculating a long side length b 1 of the photographed ink drop (S20); Calculating a long side blurring length b 2 in the photographed ink drop (S30); And subtracting the long side direction blurring length b 2 of the ink drop calculated in step S30 from the long side length b 1 of the ink drop calculated in step S20 to the long side length b of the ink drop. And calculating a volume of the ink drop (S40).

In the method for measuring the ink drop volume of the present invention, the step S10 may include a background uniformity step S11 for removing shading and noise in the background of the photographed video image, and a distance in the advancing direction of the nozzle ejected from the inkjet. The cameras are installed spaced apart from each other, and each camera shoots ink drops with a specific time difference (T) at a specific exposure time (E), and measures the distance (D) between ink drops from each camera. Characterized in that step S12.

In the method of measuring the ink drop volume of the present invention, the step (S20) is a step of specifying the outline curve of the ink drop in the image photographed by the camera (S21), and the equation of the specified ink drop through the curve fitting equation It is characterized in that it comprises the step (S22) of modeling, and the step (S23) of calculating the long side length (b 1 ) of the ink drop using this equation.

In the ink drop volume measuring method of the present invention, the blurring length b 2 in the step S30 is characterized by the following equation.

b 2 = (V × E) / R,

V (speed of ink drop) = D / T, where D is the distance between ink drops taken by each camera.

In the ink drop volume measuring method of the present invention, the mathematical modeling of the ink drop in the step 20 or step S40 is characterized by an elliptic equation.

In the ink drop volume measuring method of the present invention, the mathematical modeling of the ink drop in step 20 or step S40 is characterized in that the multi-dimensional equation.

In the ink drop volume measuring method of the present invention, the ink drop volume calculating step (S40) is characterized by calculating by integrating an ellipse or a multi-dimensional equation around the drop direction of the ink drop.

According to the above-described configuration and method, an ink drop is photographed using two cameras, and a system capable of reflecting environmental variables by correcting a deviation caused by blurring can be used to construct an accurate drop volume through image analysis and numerical analysis. Has the effect of being possible.

In addition, such an accurate ink drop measurement effect is achieved only by the method of two cameras, it is possible to measure the ink drop economically and simply without expensive complicated equipment as in the conventional laser vision system.

EMBODIMENT OF THE INVENTION Hereinafter, one Example of the volume drop measurement apparatus of the ink drop of this invention is described with reference to drawings. 3 is a view showing the ink drop volume measuring device of the present invention.

The ink drop volume measuring apparatus of the present invention includes a light control unit 20 for irradiating illumination perpendicular to the drop direction of the ink drop ejected from the inkjet 10, and a camera for photographing the ink drop irradiated by the light control unit. (31,32), a frame grabber (40) for receiving ink image data photographed by the plurality of cameras (31,32), and calculating a volume of ink drop, and a volume connected to the frame grabber (40). It consists of a PC 90 including a calculator 50.

The light control unit 20 is typically made of LED lighting.

The plurality of cameras 31 and 32 are installed to be spaced apart at a distance up and down in the drop direction of the ink drop, and have a specific resolution R and are configured to photograph with a time difference T.

The shooting distance difference T between the cameras 31 and 32 and the shooting time difference between the cameras are selected in correspondence with the normal jetting speed of the ink jet so that each ink drop is taken within the shooting range of each camera. .

On the other hand, the plurality of cameras are not only configured to be spaced apart from each other by a specific distance up and down in the ink drop direction, but also arranged to form a predetermined angle (θ) with each other, it is also possible to measure the volume of the ink drop at various angles.

The frame grabber 40 digitizes an analog video signal appearing through video media such as cameras 31 and 32 into a signal that can be processed by the personal PC 50 by digitizing it into bits defined per sample.

The volume calculator 50 may be configured to be included in a PC 50 that is easy to use by a user or a separate control room (not shown).

The volume calculator 50 includes an ink drop major axis length b 1 calculator 60, a blurring length b 2 calculator 70, and a volume calculator 80.

The ink drop major axis length (b 1 ) calculating unit functions to model the outline curve of the ink drop image photographed by each camera through curve fitting, and calculate the long axis length (b 1 ) of the ink drop from the equation. .

The blurring length b 2 calculating unit functions to calculate the blurring length b 2 from the ink drop images photographed by the cameras 31 and 32 by the following equation.

b 2 = (V × E) / R, V (speed of ink drop) = D / T, where D is the distance between ink drops on each camera.

The volume calculation unit 80 calculates a mathematical expression by curve fitting an outline curve of the ink drop by subtracting the calculating unit and the blurring length b 2 from the ink drop long axis length b 1 as the long axis length b. By integrating this equation around the long axis, the volume of the ink drop is calculated.

Next, a method of measuring the ink drop volume using the ink drop volume measuring device thus formed will be described. Fig. 4 is a flowchart showing the entire ink drop volume measuring method of the present invention.

Fig. 5 is a flowchart showing step S10 in the ink drop volume measuring method of the present invention.

First, the method for measuring the volume of the ink drop ejected from the nozzle of the inkjet apparatus of the present invention performs the step (S10) of photographing the ink drop in each camera (31,32).

FIG. 6 is a diagram showing an image image background uniforming step S11 in step S10 of the method for measuring ink drop volume in the present invention.

In step S10, first, the background is processed into a uniform image by performing a preprocessing step (S11) using a flat field correction algorithm (FFC) to remove shading and noise in the background of the image. The contrast with the drop will be clearer.

7 is a diagram showing an ink drop photographing step S12 in step S10 of the method for measuring ink drop volume in the present invention.

Each of the cameras 31 and 32 has a specific resolution R and is spaced apart from each other in the direction of travel of the nozzle ejected from the inkjet apparatus 10 so as to have a specific time difference T with a specific exposure time E. Each step of photographing the ink drop is performed (S12).

In this embodiment, the cameras 31 and 32 have a resolution R of 1 μm / pixel, and the separation distance D between each other is set to 30 μm and the exposure time E is set to 1 μsec.

In this way, the distance D between the ink drop in the first camera 31 and the ink drop in the second camera 32 may be measured.

8 is a flowchart showing step S20 in the ink drop volume measuring method of the present invention.

Next, a step S20 of calculating the long side length b 1 of the ink drops photographed by the cameras 31 and 32 is performed.

When the ink drop is clearly photographed, the long side length b 1 of the photographed ink drop may be used as it is to measure the long side length.

However, the case in which the shape of the ink drop is blurred and unclear as described above corresponds to a more general case, and is preferably calculated by the following steps.

FIG. 9 is a diagram showing an ink drop outline curve specifying step S21 taken in step S21 of the method for measuring ink drop volume in the present invention.

In the image image photographed at step S10, the shape of the drop is low because the sharpness and contrast are low, so it is difficult to specify the exact shape and the long side length is difficult to measure. Step S21 of specifying the curve is performed.

FIG. 10 is a diagram showing a step S22 of mathematically modeling an ink drop contour curve specified in step S22 of the method for measuring ink drop volume in the present invention.

Then, the step S22 of modeling the outline curve of the ink drop specified in step S21 through curve fitting is performed.

In this embodiment, the equation for the contour of the ink drop was modeled as x 2 / a 2 + y 2 / b 1 2 = 1 using an elliptic equation.

The Least Square Fitting method was used as a modeling method.

The outline of the ink drop is modeled as an elliptic equation in the present embodiment, but the present invention is not limited thereto. For example, modeling the left or right side of the ink drop using a higher-order equation, such as a fourth-order equation, is also possible. It is possible.

By such mathematical modeling, the step S23 of determining the major axis length b 1 of the ink drop by mathematical calculation is performed.

In the present embodiment, the mathematical operation result is determined to be a = 15 μm and b 1 = 17 μm.

Next, the step S30 of calculating the blurring length b 2 is performed.

The blurring length b 2 is determined by the following equation.

b 2 = (V × E) / R = (30μm / 6sec × 1μsec) / (1μm / pixel) = 5 pixel

(V: speed of ink drop = D / T, D: distance between ink drops taken by each camera.)

11 is a diagram showing step S40 in the method for measuring ink drop volume of the present invention.

Finally, calculating the volume of the ink drop by subtracting the blurring length (b 2 ) from the long side length (b 1 ) of the photographed ink drop as the long side length (b = b 1 -b 2 ) (S40). Perform

b = 37 μm-5 μm = 32 μm / 2 = 16 μm

To calculate the volume of the ink drop, assume that the volume of this ink drop is an ellipsoid with an ellipse rotated about the y axis and mathematically calculate the volume for these ellipsoids.

Elliptic equation x 2 / a 2 + y 2 / b 2 = 1 (1)

In V = 2π∫x 2 dy, x 2 is replaced by the term of y using Equation (1), integrated, and b is substituted for y.

V = 4πa 2 b / 3

Here, the volume of the ink drop is 15,072 pL, by substituting a = 15 μm and b = 16 μm calculated in the present embodiment.

As described above, the present invention uses two cameras to calculate an accurate drop volume through image analysis and numerical analysis considering environmental variables such as blurring.

The foregoing embodiments are illustrative of the technical spirit of the present invention, and thus are not to be construed as limiting the present invention, and thus, may be modified and modified without departing from the technical scope of the present invention. Should be.

1 is a view showing a device for measuring the ink drop ejected from the inkjet jet nozzle in the prior art.

FIG. 2 is a diagram illustrating a method of measuring the volume of an ink nozzle through the measuring device of FIG. 2.

3 is a view showing the ink drop volume measuring device of the present invention.

Fig. 4 is a flowchart showing the entire ink drop volume measuring method of the present invention.

Fig. 5 is a flowchart showing step S10 in the ink drop volume measuring method of the present invention.

FIG. 6 is a diagram showing an image image background uniforming step S11 in step S10 of the method for measuring ink drop volume in the present invention.

7 is a diagram showing an ink drop photographing step S12 in step S10 of the method for measuring ink drop volume in the present invention.

8 is a flowchart showing step S20 in the ink drop volume measuring method of the present invention.

FIG. 9 is a diagram showing an ink drop outline curve specifying step S21 taken in step S21 of the method for measuring ink drop volume in the present invention.

FIG. 10 is a diagram showing a step S22 of mathematically modeling an ink drop contour curve specified in step S22 of the method for measuring ink drop volume in the present invention.

Fig. 11 is a diagram showing step S40 in the method for measuring ink drop volume of the present invention.

Claims (11)

  1. An apparatus for measuring the volume of the ink drop ejected from the nozzle of the inkjet device,
    A dimmer to illuminate the ink drop,
    A plurality of cameras spaced apart at a distance D in the direction of the drop of the ink drop to photograph the irradiated ink drop, having a specific resolution R and photographed with a time difference T;
    A frame grabber for converting the analog video image signal photographed by the camera into a digital signal;
    It is connected to the frame grabber and comprises a volume calculator for calculating the volume of the ink drop,
    The volume calculator,
    An ink drop major axis length (b 1 ) calculating unit for modeling an outline curve of the ink drop images photographed by the cameras through a curve fitting and calculating the major axis length (b 1 ) of the ink drop from the equation;
    A blurring length b 2 calculator configured to calculate a blurring length b 2 from the ink drop image photographed by the camera by the following equation;
    b 2 = (V × E) / R, V (speed of ink drop) = D / T, where D is the distance between ink drops on each camera.
    Using the ink drop long axis length (b 1 ) subtracting the calculating unit, the blurring length (b 2 ) as the long axis length (b), the contour of the ink drop is curve-fitted and modeled by the equation, and the long axis in this equation An ink drop volume measuring apparatus comprising: a volume calculating unit for calculating the volume of ink drop by integrating with the center.
  2. The method of claim 1,
    The volume calculation unit further includes any one or both of a background equalizer for processing shading and noise by the dimming unit and an outline processing unit for specifying an outline of the photographed ink drop. Device.
  3. The method according to claim 1 or 2,
    And the plurality of cameras are disposed such that angles θ are formed to each other when viewed from an upper surface.
  4. A method for measuring the volume of ink drop ejected from a nozzle of an inkjet device,
    Photographing ink drops spaced apart from each other in the advancing direction of the nozzles ejected from the inkjet and having a specific resolution R with a specific time difference T at a specific exposure time E (S10);
    Calculating a long side length b 1 of the photographed ink drop (S20);
    Calculating a long side blurring length b 2 in the photographed ink drop (S30); And
    To the rest of the sensitive a longitudinal direction blurring length (b 2) of the ink drop calculated in step (S30) in the step (S20) of the long side length (b 1) of the ink-drop operation in a long side length (b) of an ink drop Ink drop volume measuring method comprising the step of calculating the volume of the ink drop (S40).
  5. The method of claim 4, wherein
    The step (S10),
    A background uniforming step (S11) for removing shading and noise in the background of the captured video image;
    The cameras are spaced apart from each other in the direction of travel of the nozzles ejected from the inkjet, and each ink drop is photographed at a specific exposure time (E) at a specific exposure time (E). Ink drop volume measuring method comprising the step (S12) of measuring the distance (D) between the drops.
  6. The method according to claim 4 or 5,
    The step (S20),
    Specifying an outline curve of the ink drop from the image photographed by the camera (S21),
    Modeling the outline curve of the specified ink drop through curve fitting (S22), and
    An ink drop volume measuring method comprising the step (S23) of calculating the long side length (b 1 ) of an ink drop using this equation.
  7. The method according to claim 4 or 5,
    In the step (S30), the blurring length (b 2 ) is determined by the following equation, the ink drop volume measuring method.
    b 2 = (V × E) / R,
    V (speed of ink drop) = D / T, where D is the distance between ink drops taken by each camera.
  8. The method according to claim 4 or 5,
    The method of measuring the ink drop volume, characterized in that the mathematical modeling of the ink drop in the step (S20) or step (S40) is an elliptic equation.
  9. The method according to claim 4 or 5,
    Ink drop volume measuring method, characterized in that the mathematical modeling for the ink drop in the step (S20) or step (S40) is a multi-dimensional equation.
  10. The method of claim 8,
    The ink drop volume calculating step (S40) is an ink drop volume measuring method, characterized in that it is calculated by rotationally integrating the elliptic equation around the drop direction of the ink drop.
  11. 10. The method of claim 9,
    The ink drop volume calculation step (S40) is the ink drop volume measurement method, characterized in that it is calculated by the rotational integration of the multi-dimensional equation around the drop direction of the ink drop.
KR20080097258A 2008-10-02 2008-10-02 Ink drop measuring device and its measuring method KR100997451B1 (en)

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US10488848B2 (en) 2011-12-21 2019-11-26 Deka Products Limited Partnership System, method, and apparatus for monitoring, regulating, or controlling fluid flow
US9151646B2 (en) 2011-12-21 2015-10-06 Deka Products Limited Partnership System, method, and apparatus for monitoring, regulating, or controlling fluid flow
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US8531517B2 (en) * 2010-07-15 2013-09-10 Kai Tao IV monitoring by video and image processing
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USD752209S1 (en) 2013-11-06 2016-03-22 Deka Products Limited Partnership Apparatus to control fluid flow through a tube
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USD854145S1 (en) 2016-05-25 2019-07-16 Deka Products Limited Partnership Apparatus to control fluid flow through a tube
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