KR101225121B1 - Apparatus for monitoring inkjet printer head - Google Patents

Apparatus for monitoring inkjet printer head Download PDF

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Publication number
KR101225121B1
KR101225121B1 KR1020100104899A KR20100104899A KR101225121B1 KR 101225121 B1 KR101225121 B1 KR 101225121B1 KR 1020100104899 A KR1020100104899 A KR 1020100104899A KR 20100104899 A KR20100104899 A KR 20100104899A KR 101225121 B1 KR101225121 B1 KR 101225121B1
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KR
South Korea
Prior art keywords
photographing means
rotating
inkjet printer
rotating mirror
printer head
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KR1020100104899A
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Korean (ko)
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KR20120043557A (en
Inventor
신동윤
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한국기계연구원
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  • Engineering & Computer Science (AREA)
  • General Physics & Mathematics (AREA)
  • Analytical Chemistry (AREA)
  • Optics & Photonics (AREA)
  • Ink Jet (AREA)
  • Chemical & Material Sciences (AREA)
  • Quality & Reliability (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • General Health & Medical Sciences (AREA)
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  • Manufacturing & Machinery (AREA)
  • Health & Medical Sciences (AREA)

Abstract

The present invention relates to an inkjet printer head monitoring device for observing a plurality of ink droplets ejected from an inkjet printer head at high speed, the inkjet printer head for observing a plurality of ink droplets ejected from a plurality of nozzles of the inkjet printer head. A monitoring apparatus, comprising: a plurality of photographing means for photographing the ink droplets to obtain an image, and a plurality of photographing means provided on an optical path between the plurality of photographing means and the ink droplets, the plurality of photographing means being rotatably installed in a straight line. Integrating the plurality of photographing means in correspondence to the amount of change by the rotation of the rotating mirror part so that the length of each optical path from the rotating mirror part and the photographing means to the ink droplet is maintained constant. A moving stage and the photographing means, And a control unit for controlling the operation of the rotating mirror unit and the moving stage, wherein the photographing means captures an image of the ink droplet reflected by the rotating mirror unit.

Description

Inkjet print head monitoring device {APPARATUS FOR MONITORING INKJET PRINTER HEAD}

The present invention relates to an inkjet printer head monitoring apparatus, and more particularly, to an inkjet printer head monitoring apparatus for enabling a high speed observation of a plurality of ink droplets ejected from a plurality of inkjet printer heads.

Inkjet printing technology is being applied in various industries, from office printing devices to micro patterning processes. In the manufacturing process using the inkjet printing technology, the characteristic of the head for directly discharging ink is an important factor in determining the reliability of the process because ink droplets must be discharged consistently and accurately in order to guarantee product quality.

Therefore, as a method for verifying and improving the consistency and accuracy of the ink droplets discharged from the nozzle of the inkjet head, research on a method for monitoring and evaluating the operating state of the nozzle by observing the ink droplets has been continued. In this case, a manufacturing process using inkjet technology typically uses a head having a plurality of nozzles to increase productivity, so that it is necessary to be able to observe the state of several nozzles at high speed.

The present inventors have proposed a technology related to a "high speed optical observation system" in which a plurality of ink droplets can be observed at a high speed in Korean Patent No. 10-0845301. 1 is a diagram illustrating an apparatus for acquiring an image of a plurality of ink droplets by observing a conventional inkjet head at high speed.

According to this, the image acquisition means 20 such as a camera photographs the ink droplets 11 discharged from the nozzle 10 of the inkjet head and acquires the images. The image acquisition means 20 has different ink droplets 11 from each other. The rotatable polygonal mirror 30 is positioned between the image acquisition means 20 and the ink droplet 11 in a configuration for photographing the image.

By rotating the polygon mirror 30, the optical path between the image acquisition means 20 and the ink droplets 11 is changed, so that the image acquisition means 20 generates a plurality of ink droplets at high speed only by rotating the polygon mirror 30. FIG. (11) can be observed. However, since the path lengths from the polygon mirror 30 to the ink droplets 11 are not equal to each other, there is a problem that the image acquisition means 20 for photographing each ink droplet 11 is out of focus as the optical path is changed. This problem can be corrected by providing a focus compensating lens 40 between the polygon mirror 30 and the ink droplet 11, or by having each image acquisition means 20 have a motorized zoom lens (not shown).

However, in this method, since the focus correction lens 40 or the motorized zoom lens, which must be provided to obtain a clear image of each ink droplet 11, is expensive equipment, it is not economically easy to utilize.

In particular, there are a plurality of inkjet printer heads, or in order to reduce the observation time, the image acquisition means 20 is mounted so that a plurality of images can be acquired at once, and photographing may be performed. Since each image acquisition means 20 must be provided with a focus correction lens 40 or a motorized zoom lens individually, there is a problem that a large cost is consumed.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and an inkjet head monitoring apparatus for observing a plurality of ink droplets ejected from a nozzle of an inkjet head at high speed without using optical equipment such as an expensive focusing lens or an electric zoom lens. The purpose is to provide.

In particular, an inkjet head monitoring apparatus can be used to accurately capture a large number of ink droplets at high speed while reducing costs by allowing a single apparatus to control a plurality of photographing means even when observing using a plurality of photographing means. The purpose is to provide.

In order to achieve the above object, the inkjet head monitoring apparatus of the present invention is an inkjet printer head monitoring apparatus for observing a plurality of ink droplets ejected from a plurality of nozzles of an inkjet printer head, wherein a plurality of images are obtained by photographing the ink droplets. A plurality of photographing means and a plurality of rotating mirror parts provided on an optical path between the plurality of photographing means and the ink droplets, the plurality of rotating mirror parts rotatably installed in a straight line and the rotating mirror part from the photographing means. The moving stage and the photographing means, the rotating mirror portion and the moving stage for integrally moving the plurality of photographing means corresponding to the amount of change by the rotation of the rotating mirror part so that the length of each optical path leading to the enemy is kept constant. A control unit for controlling an operation, Group pickup means is characterized in that for recording an image of the enemy ink liquid reflected by the rotary mirror unit.

The rotating mirror unit may be designed to include a mirror body having a reflective surface and a rotation driving unit for rotating the mirror body.

In addition, it is preferable that the mirror body has at least three or more reflecting surfaces in order to improve the observation speed when performing periodic observations repeatedly using the inkjet head monitoring apparatus.

The moving stage preferably moves the photographing means along the optical path between the photographing means and the rotating mirror in order to minimize the moving distance of the photographing means for correcting the focal length.

The apparatus may further include a fixed mirror unit installed to correspond to the plurality of photographing means on an optical path between the photographing means and the rotating mirror part so as to observe a plurality of ink droplets at a high speed by using a plurality of photographing means. The moving stage moves the photographing means in a direction perpendicular to the arrangement surface of the nozzle, and the photographing means photographs an image of the ink droplet reflected by the rotating mirror part and reflected by the fixed mirror part. desirable.

In addition, the rotating mirror part corresponding to each photographing means is arranged in a row so that the plurality of rotating mirror parts are controlled by one driving part, and the rotating driving part is belted. Or chains or links.

According to the present invention, a plurality of ink droplets are observed at high speed by rotation of the rotating mirror unit by using a rotating mirror unit rotatably installed between the photographing means and the ink droplets to change the optical path between the photographing means and the ink droplets by rotation. An inkjet print head monitoring device is provided, which makes it possible to do so.

In addition, by moving the photographing means using a moving stage to maintain a constant length of the optical path from the photographing means to the ink droplets through the rotating mirror portion, shooting during shooting without the need for a separate optical equipment for correcting the optical path difference An inkjet printer head monitoring apparatus is provided which allows the focus of the means to be accurately focused on all ink droplets.

In addition, even when a large number of droplets are to be observed at a high speed using a plurality of photographing means, a plurality of control devices are provided by moving the photographing means using one moving stage and controlling the rotation of the rotating mirror part using a single rotation driving part. Compared to the case of driving each photographing means or each rotating mirror unit through the error can be reduced, the inkjet printer head monitoring device that can be observed precisely by attenuating vibration, and can reduce the cost.

1 is a diagram illustrating an apparatus for acquiring an image of a plurality of ink droplets by observing a conventional inkjet head at high speed.
2 is a view showing an inkjet printer head monitoring apparatus according to a first embodiment of the present invention.
3 is a diagram showing a configuration corresponding to each photographing means of the inkjet printer head monitoring apparatus according to the second embodiment of the present invention.
4 is a view showing an inkjet printer head monitoring apparatus according to a third embodiment of the present invention.

Hereinafter, an inkjet printer head monitoring apparatus 200 according to a first embodiment of the present invention will be described with reference to the accompanying drawings.

2 is a view showing the inkjet printer head monitoring apparatus 200 according to the first embodiment of the present invention.

Referring to FIG. 2, the inkjet printer head monitoring apparatus 200 according to the present embodiment is an inkjet printer head monitoring apparatus that observes a plurality of ink droplets 120 ejected from a plurality of nozzles 110 of the inkjet printer head 100. The photographing means 210 of claim 200, wherein the photographing means 210 photographs the ink droplets 120 to obtain an image, and the plurality of photographing means on the optical path between the photographing means 210 and the ink droplets 120. A plurality of rotating mirrors 240 rotatably installed corresponding to the respective 210, and lengths of light paths from the photographing means 210 to the ink droplets 120 through the rotating mirrors 240. Control the operation of the moving stage 220 and the shooting means 210, the rotating mirror unit 240 and the moving stage 220 to integrally move the plurality of photographing means 210 to maintain a constant Control unit (not shown) And the photographing means 210 photographs an image of the ink droplet 120 reflected by the rotating mirror part 240.

The ink droplet 120 to be observed by the inkjet printer head monitoring apparatus 200 may have a size of 5 to 100 μm, and the discharge movement speed may be 1 to 20 m / s.

The photographing means 210 is for acquiring an image by observing and photographing the ink drop 120. A camera having a charge coupled device (CCD) or a complementary metal oxide semiconductor (CMOS) imaging device may be used. Various imaging means 210 other than a CCD camera or a CMOS camera may be used within a range in which 120 may be obtained by observing images.

The photographing means 210 is for observing a plurality of inkjet printer heads 100 simultaneously, and a plurality of photographing means 210 are also provided. The photographing means 210 is arranged in parallel with the surface on which the nozzle 110 of the inkjet printer head 100 is arranged, and is coupled to one support 225. Further, each imaging means 210 is located at the same position relative to the corresponding inkjet printer head 100.

Here, it is preferable that the photographing means 210 uses a camera having a high pixel image pickup device capable of obtaining a high frame rate of 30 frames / sec or higher and a high resolution image. It is preferable to include a high magnification lens of 3 times or more that can be adjusted according to the size of the ink droplet 120, a doubler lens for field of view adjustment may be included, and an aperture for depth and light adjustment may be included. May be included.

In addition, the moving stage 220 is used for accurate focusing on the ink droplet 120. The moving stage 220 moves the support 225 in a direction perpendicular to the nozzle 110 array surface so that the photographing means 210 can move back and forth along the direction of the inkjet printer head 100 to be photographed, respectively. do. In this case, for the best image quality, the optical depth of focus of the photographing means 210 with respect to the ink droplet 120 preferably has at least two times the maximum length of the ink droplet 120 to be observed.

The moving stage 220 is coupled to the photographing means 210 to integrally move the photographing means 210, the light path from the photographing means 210 through the rotating mirror portion 240 to the ink droplets 120 It keeps the distance constant and plays the role of focusing.

The moving stage 220 is used to correct the optical path difference from the rotating mirror unit 240 to the respective ink droplets 120. It is preferable that the moving stage 220 can be precisely operated, and can be configured using a linear ultrasonic motor. .

In this embodiment, the moving stage 220 is installed to move the photographing means 210 in a direction perpendicular to the arrangement surface of the nozzle 110.

The rotating mirror unit 240 changes the respective optical paths between the plurality of photographing means 210 and the ink droplets 120 and has a mirror body 241 and a mirror body 241 having a single plane reflective surface. Rotation driving unit 242 to rotate.

Since the rotation driving unit 242 is determined by the rotation of the pulse, it is preferable to use a rotary ultrasonic motor capable of finely and accurately adjusting the rotation angle of the mirror body 241.

In the present embodiment, the fixed mirror unit 230 is installed on each optical path between the photographing means 210 and the rotating mirror unit 240. The fixed mirror unit 230 is installed at a predetermined angle so that the photographing means 210 is reflected by the rotating mirror unit 240 and the ink droplet 120 reflected back to the fixed mirror unit 230 can be observed. .

Hereinafter, the operation of the inkjet printer head monitoring apparatus 200 according to the first embodiment of the present invention will be described.

The ink droplets 120 discharged from the nozzles 110 of the inkjet printer head 100 fall on a predetermined plane.

The photographing means 210 is a light path from the photographing means 210 to the fixed mirror portion 230, from the fixed mirror portion 230 to the rotating mirror portion 240, and the rotating mirror portion 240 from the ink droplet 120 As a result, the ink droplet 120 is observed.

Under the control of the control unit, the photographing unit 210 moves a region including a portion or a plurality of the ink droplets 120 through an optical path formed according to the rotation angle represented by the mirror body 241 of the rotating mirror unit 240. The ink droplet 120 moving in the corresponding region by accurately focusing using the 220 is observed.

After the observation of one region, the mirror body 241 is rotated by the rotation driving unit 242 to change the optical path from the photographing means 210 to the ink droplet 120. At this time, the rotation driving unit 242 of the rotation mirror unit 240 transmits an electrical detection signal for the rotation angle of the mirror body 241 to the control unit to control the driving of the rotation driving unit 242 by the photographing means ( The rotation angle of the mirror body 241 is optimized so that 210 may observe another area.

The optical path is changed so that the length of the optical path from the photographing means 210 to the ink droplet 120 through the mirror body 241 is changed, and the control unit controls the moving stage 220 to control the photographing means 210. Move it. As the position of the photographing means 210 is changed according to the driving of the moving stage 220, the change of the optical path from the rotating mirror part 240 to the ink droplet 120 may be corrected, and the photographing means 210 may be changed. The ink droplet 120 moving in the area can be accurately focused and observed.

In this case, in order to observe the plurality of ink droplets 120 at high speed, it is necessary to minimize the moving distance of the photographing means 210 by the moving stage 220. For this purpose, the plurality of photographing means 210 is the photographing means. It is preferable to move along each optical path formed between the 210 and the rotating mirror 240.

In this embodiment, each of the optical paths between the plurality of photographing means 210 and the rotating mirror portion 240 is fixed mirror portion 230 from the photographing means 210, rotating mirror portion 240 from the fixed mirror portion 230 Since it is formed along a path leading to, the moving stage 220 by minimizing the moving distance of the recording means 210 for the focal length correction by integrally moving the recording means 210 in the direction of the fixed mirror portion 230. have.

As described above, the inkjet printer head monitoring apparatus 220 according to the present embodiment is installed to be rotatable in a straight line to change the respective optical paths between the plurality of photographing means 210 and the ink droplets 120 by rotation. By using the rotating mirror unit 240 to be rotated, there is an advantage that a large number of ink droplets 120 can be observed at high speed only by rotating the rotating mirror unit 240. In this process, the focal length correction due to the distance difference from the rotating mirror unit 240 to the ink droplet 120 is performed by integrally moving the plurality of photographing means 210 only by driving the moving stage 220. No need to use optics to save money.

In addition, the photographing means 210 observes a plurality of inkjet printer head 100 at the same time. Since the relative positions of the photographing means 210, the fixed mirror portion 230, and the rotating mirror portion 240 with respect to the corresponding inkjet printer head 100 are all the same, each of the images from the photographing means 210 to the ink droplet 120 The lengths of the light paths are the same, and the lengths of the respective light paths from the rotating mirror unit 240 to the ink droplets 120 are also the same.

Therefore, the amount of change in the optical path from the rotating mirror part 240 to the ink droplet 120 generated by the rotation of the rotating mirror part 240 is also the same in each photographing means 210, and shifts the deviation. The stage 220 may correct the plurality of photographing means 210 by integrally moving the plurality of photographing means 210 in the direction of the fixed mirror part 230, that is, the direction perpendicular to the arrangement surface of the nozzle 110.

Position movement of the plurality of photographing means 210 is integrally made by one moving stage 220. According to the related art, since a focus correcting lens or a motorized zoom lens corresponding to each of the plurality of photographing means 210 has to be corrected individually, a large cost incurring such an apparatus is generated, and also different from each other. On the other hand, according to the present embodiment, the focus of the plurality of photographing means 210 can be simultaneously corrected using only one moving stage 220, thereby reducing the cost and reducing the error. There is an advantage. In addition, even when compared to the case of using a plurality of moving stages 220 by using a single moving stage 220 can attenuate the vibration can increase the accuracy of the measurement.

Hereinafter, an inkjet printer head monitoring apparatus 200 according to a second embodiment of the present invention will be described with reference to the accompanying drawings.

3 is a view showing an inkjet printer head monitoring apparatus according to a second embodiment of the present invention. Since members designated by the same member number as those shown in FIG. 2 have the same configuration and function, detailed description of overlapping portions will be omitted.

In this embodiment, the mirror body 241 is provided with a polygon mirror having at least three reflective surfaces.

When the photographing means 210 periodically observes different areas sequentially, when the mirror main body 241 having the planar mirror having a single reflecting surface is used, the photographing means 210 observes various areas while changing the rotation angle of the mirror main body 241. After the mirror body 241 is rotated one by one and sequential observation is performed again, in the case of using the mirror body 241 having at least three reflective surfaces, only a predetermined angle is rotated even if the mirror body 241 does not rotate one time. After the observation can be performed again using the adjacent reflection surface, there is an advantage that can photograph a plurality of ink droplets 120 at a high speed.

Hereinafter, an inkjet printer head monitoring apparatus 200 according to a third embodiment of the present invention will be described with reference to the accompanying drawings.

4 is a diagram showing an inkjet printer head monitoring apparatus 200 according to a third embodiment of the present invention. Members designated by the same member number as those shown in FIGS. 2 to 3 have the same configuration and function, and thus descriptions of overlapping portions will be omitted.

A plurality of rotation driving units 242 of the rotation mirror unit 240 are arranged in a row so as to be interlocked in a straight line and connected to each other by a belt, a chain, or a link 245. In the present embodiment, when three shooting means 210 are used, three rotating mirror parts 240 corresponding to the respective shooting means 210 are used, and only the second rotating driving part 242 is used. Driven by the control of the controller.

The driving force transmitted by the belt, the chain or the link 245 is transmitted to the first and third rotary drive unit 242. According to the inkjet printer head monitoring apparatus 200 according to the present exemplary embodiment, even when a plurality of rotating mirror units 240 are used, the remaining rotary driving units 242 are driven using a driving force generated by one rotary driving unit 242. Controllability can reduce costs and reduce errors that can occur by driving multiple units individually.

10 nozzle of inkjet head 11 ink droplet
20: image acquisition means 30: polygon mirror
100: inkjet printer head 110: nozzle
120: ink droplets
200: inkjet printer head monitoring device
210: recording means 220: moving stage
225: support 230: fixed mirror portion
240: rotating mirror portion 241: mirror body
242: rotary drive unit 245: belt, chain or link

Claims (6)

An inkjet printer head monitoring apparatus for observing a plurality of ink droplets ejected from a nozzle of an inkjet printer head,
A plurality of photographing means for photographing the ink droplets to obtain an image;
A plurality of rotating mirrors provided on an optical path between the plurality of photographing means and the ink droplets, the plurality of rotating mirrors being rotatably installed in a straight line;
A moving stage for integrally moving the plurality of photographing means corresponding to the amount of change by the rotation of the rotating mirror part so that the length of each optical path from the photographing means to the ink droplet is maintained constant;
And a controller configured to control operations of the photographing means, the rotating mirror unit, and the moving stage.
And the photographing means captures an image of the ink droplet reflected by the rotating mirror part. The method of claim 1,
And the rotating mirror unit includes a mirror main body having a reflective surface and a rotating driving unit rotating the mirror main body. The method of claim 2,
And the mirror body has at least three reflective surfaces. The method of claim 1,
And the moving stage moves the photographing means along an optical path between the photographing means and the rotating mirror part. 5. The method of claim 4,
And a fixed mirror unit installed on the optical path between the photographing unit and the rotating mirror unit to correspond to the plurality of photographing units, respectively.
The moving stage moves the photographing means in a direction perpendicular to the arrangement surface of the nozzle,
And the photographing means captures an image of the ink droplet reflected by the rotating mirror part and reflected by the fixed mirror part. The method of claim 2,
The rotating mirror unit is arranged in a line,
Inkjet printer head monitoring device, characterized in that the rotary drive unit of the rotary mirror unit is connected integrally driven by a belt, chain or link
KR1020100104899A 2010-10-26 2010-10-26 Apparatus for monitoring inkjet printer head KR101225121B1 (en)

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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050091570A (en) * 2004-03-12 2005-09-15 주식회사 미르기술 Vision inspection apparatus and method using the same
KR100845301B1 (en) * 2007-06-07 2008-07-10 한국기계연구원 High speed optical monitoring system
EP2033791A2 (en) 2007-09-04 2009-03-11 Ricoh Company, Ltd. Liquid ejection head unit and image forming apparatus
KR101013156B1 (en) * 2008-10-10 2011-02-10 한국기계연구원 High speed optical monitoring system

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20050091570A (en) * 2004-03-12 2005-09-15 주식회사 미르기술 Vision inspection apparatus and method using the same
KR100845301B1 (en) * 2007-06-07 2008-07-10 한국기계연구원 High speed optical monitoring system
EP2033791A2 (en) 2007-09-04 2009-03-11 Ricoh Company, Ltd. Liquid ejection head unit and image forming apparatus
KR101013156B1 (en) * 2008-10-10 2011-02-10 한국기계연구원 High speed optical monitoring system

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