KR101361456B1 - Vector printing method of electronic print system using cad drawings - Google Patents

Abstract

The present invention relates to a vector printing method of electronic print system using cad drawings. The print system comprises: a controller for controlling the discharge of a nozzle; an image photographing unit, installed on one side of a discharge head, for photographing a discharged object while moving in the same direction as the discharge head; a discharged object moving unit for moving a discharged object in which ink discharged from a nozzle is printed and which faces the nozzle; and a head moving unit for moving the discharge head; and the discharge head having at least one nozzle from which ink is discharged. The vector printing method comprises the following steps: drawing a cad drawing having patterns to be printed by the discharged object; determining a discharge point by dividing the whole length of patterns to be printed into regular intervals; determining a coordinate of the discharge point; selecting a nozzle from which ink is discharged from the discharge head; and generating a discharge trigger from the discharge point along the patterns to be printed in consecutive order. A distance between discharge points may be the same considering acceleration, speed maintaining, and deceleration areas. The vector printing method can fundamentally remove printing errors in the acceleration and deceleration areas using a point mode. [Reference numerals] (1100) Step of drawing a cad drawing of a pattern to be printed; (1200) Determining a discharge point by dividing the whole length of patterns to be printed into regular intervals;; (1300) Determining a coordinate of the discharge point; (1400) Selecting a nozzle from which ink is discharged from the discharge head; (1500) Generating a discharge trigger from the discharge point along the patterns to be printed in consecutive order; (1600) Determining whether the number of discharge is 2 or more at the discharge point; (1700) Implementing multiple discharges for the corresponding discharge point; (1800) Moving the nozzle to a next discharge point; (1900) Last discharge point?; (AA) START; (BB) END

Description

Vector printing method of electronic printing system using CAD drawing {VECTOR PRINTING METHOD OF ELECTRONIC PRINT SYSTEM USING CAD DRAWINGS}

The present invention relates to a vector printing method of an ink drop ejection system, and more particularly, by printing using a DXF file of a CAD drawing to prevent a printing error from occurring in an acceleration section and a deceleration section of a discharge head and to improve print quality. And a vector printing method of an ink droplet ejection system.

With the development of Inkjet technology, the range of applications from office use to printed electronics such as electronic parts and display manufacturing is widening. As these inkjets have expanded their range of application as manufacturing processes, unlike office inkjet equipment, there is a need for precise control of the size of ink drops and technology for precisely discharging them within a few micrometers at a desired position. . Unlike conventional semiconductor processes, the inkjet technology can be processed without wasting expensive materials and can be easily enlarged. Therefore, studies are being actively conducted to apply inkjet to mass production processes, especially in the electronic printing field.

In addition, as the inkjet technology expands the application range of display manufacturing, the need for patterning by discharging the correct amount of ink in the correct position is increasing. Therefore, it is necessary to use a file such as a CAD in order to print the pattern with accurate dimensions.

The printing method using CAD includes a raster printing method of converting CAD drawings into bitmap images and printing them, and a stage (dxf file, drawing exchange file format file). There is a vector printing method of printing by moving the stage. The Dxf file is an ASCII file and is a file widely used for drawing exchange between various CAD cards. The file includes all drawing information such as dimensions and linetypes of the drawing.

Raster printing, on the other hand, is suitable for printing more complex images in such a way that the discharge head prints only in the main direction and only moves in the sub-direction, and is more advantageous for the head having multiple nozzles.

On the other hand, unlike the raster printing method, the vector printing method is suitable for printing when two axes of XY move simultaneously and have a small number of nozzles. In addition, it is an effective and excellent method for printing relatively simple images such as diagonal lines, circles, arcs or shapes rather than complex images.

However, the conventional vector printing method is a method of printing while moving along a movement path, that is, a pattern to be printed, by using a CAD file of the CAD. This method is a method of discharging at a constant frequency during path movement. In this case, however, there is a problem that drops are not formed at regular intervals or are not discharged at regular intervals during the acceleration section and the deceleration section.

10 is a view showing the velocity profile and the ejection state of the ejection head in the case of printing a straight pattern using the prior art.

In FIG. 10, reference numeral 510 denotes a pattern to be printed and has a straight line shape. Reference numeral 530 denotes a velocity profile of the ejection head moving along the straight line 510 to print the straight line 510. The discharge head accelerates slowly at the first part of the straight line 510 (acceleration section 531) and maintains a constant speed (maintenance section 532), and slowly decelerates and stops at the end of the straight line 510 (deceleration section, 533). ).

According to the vector printing method according to the related art, in the acceleration section 531 and the deceleration section 533, since the conveying speed of the discharge head is not large, the discharge interval is narrowed so that the interval of the discharge drop 540 is not constant. As described above, the vector printing method according to the related art is a method of ejecting the ink drop at a constant frequency while the ejection head moves from the start point A to the end point B of the pattern 510 to be printed. In the acceleration section 531 or the deceleration section 533, there is a problem that the print quality is not uniform or not suitable for printing a precise pattern because the interval of ink drop ejected is not uniform.

In addition, even when the pattern of the pattern to be printed is a circle or an arc, the acceleration section or the deceleration section is affected at the beginning and the end of the printing, so that a drop of a certain interval is not formed at the beginning and end of the pattern. There is.

Accordingly, there is a growing need for a vector printing method capable of obtaining ink drops of uniform intervals over the entire length or entire section of the print pattern.

According to one embodiment of the present invention, when printing by using a de-FS file of the CAD, the length section of the pattern to be printed is divided into equal intervals, moved to a position to be discharged, and then stopped and discharged, and then moved to the next discharge position sequentially. A vector printing method of an electronic printing system using a CAD drawing which can be jetted by the present invention is provided.

An embodiment of the present invention provides a vector printing method of an electronic printing system using a CAD drawing which can form a drop of a predetermined interval even in the acceleration section and the deceleration section of the pattern to be printed.

An embodiment of the present invention provides a vector printing method of an electronic printing system using a CAD drawing that can easily adjust the thickness of a printed pattern by adjusting the number of drops to be ejected when ejecting in a stationary state by moving to the ejection position. to provide.

One embodiment of the present invention provides a vector printing method of an electronic printing system using a CAD drawing that can easily adjust the thickness of the printed pattern by adjusting the size of the equal interval dividing the length section of the pattern to be printed.

One embodiment of the present invention for solving the above problems, the discharge head having at least one nozzle for ejecting the ink droplets, the head drive for moving the discharge head, the ink droplets facing the nozzle and discharged from the nozzle A discharge target driver for moving the discharged object to be printed, an image photographing unit which is provided at one side of the discharge head and moves in the same direction with the discharge head and captures the image of the discharge object, and a control unit controlling whether or not the nozzle is discharged A vector printing method of an ink drop ejection system comprising: creating a CAD drawing of a pattern to be printed on the object to be ejected; Obtaining a discharge point by dividing a length of the pattern to be printed by a discharge interval; Obtaining coordinate information of the discharge point; Selecting one of the nozzles to be discharged from the discharge head; And sequentially generating discharge triggers at the discharge points along the longitudinal direction of the pattern to be printed, wherein the intervals between the discharge points are the same for the acceleration section, the constant velocity holding section and the deceleration section of the discharge head. It provides a vector printing method of an electronic printing system using a CAD drawing.

As described above, by dividing the length of the pattern to be printed at equal intervals, ejecting ink at the corresponding ejection point, moving to the next ejection point and performing the next ejection to ensure uniform jetting performance even in the acceleration section and the deceleration section of the ejection head. can do.

In the drawing of the CAD drawing, the CAD drawing may be a DXF file.

In the step of obtaining the discharge point, the discharge interval is equal to the distance between neighboring discharge points, and the discharge interval at the beginning and the end of the pattern to be printed is the discharge at the center of the pattern to be printed. It can be kept equal to the interval.

In the obtaining of the coordinate information, coordinates of a point matching the discharge point may be obtained from the coordinate information stored in the DXF file of the pattern to be printed.

In the obtaining of the coordinate information, a linear equation may be obtained when the pattern to be printed is a straight line, and a starting point, an end point, and an angle of the arc may be obtained when the pattern to be printed is a circle or an arc.

The generating of the discharge trigger at the discharge point may include discharging the nozzle by generating the discharge trigger while the nozzle to be discharged is positioned above the discharge point, and after the discharge, sequentially moves the nozzle onto the next discharge point. Can be.

The method may further include adjusting a thickness or width of the pattern to be printed.

The adjusting the thickness or width of the pattern to be printed may include adjusting the number of ejection of the nozzle or the number of ejection triggers per ejection point, or adjusting the ejection interval to adjust the thickness or width of the pattern to be printed. I can regulate it.

The adjusting of the thickness or width of the pattern to be printed may include printing the pattern to be printed in a thick manner so that the number of ejection of the nozzle or the number of ejection triggers per ejection point is two or more times or the ejection interval is made smaller. Can be.

As described above, the vector printing method of the electronic printing system using the CAD drawing according to an embodiment of the present invention is a head in a section in which printing starts or a section in which printing ends, because the ejection in the stopped state after moving to the ejecting position The effect of acceleration or deceleration can be eliminated, and uniform print quality can be obtained even at the start section and the end section of printing.

In the vector printing method of the electronic printing system using the CAD drawing according to an embodiment of the present invention, a drop of a constant interval may be formed even in the acceleration section and the deceleration section of the pattern to be printed.

In the vector printing method of the electronic printing system using the CAD drawing according to an embodiment of the present invention, the thickness of the printed pattern is controlled by adjusting the number of ejected drops or the number of triggers when ejecting in the stopped state by moving to the ejecting position. It can be adjusted easily.

The vector printing method of the electronic printing system using the CAD drawing according to an embodiment of the present invention may easily adjust the thickness of the printed pattern by adjusting the size of the equal interval dividing the length section of the pattern to be printed.

1 is a perspective view showing an ink drop ejection system according to an embodiment of the present invention.
FIG. 2 shows a schematic plan view of the system according to FIG. 1.
3 is a block diagram illustrating a control configuration of the system according to FIG. 1.
4 is an exemplary view showing a programmed screen for setting up vector printing in the discharge system according to FIG. 1.
5 is a view showing an example of a pattern to be printed using the discharge system according to FIG.
6 is a flow chart showing the step of vector printing using the discharge system according to FIG.
7 and 8 are diagrams for explaining a process of printing when the pattern to be printed is a straight line.
9 is a view for explaining a process of printing according to the thickness of the pattern to be printed.
10 is a view showing the velocity profile and the ejection state of the ejection head in the case of printing a straight pattern using the prior art.

Hereinafter, embodiments according to the present invention will be described in detail with reference to the accompanying drawings. However, the present invention is not limited to or limited by the embodiments. Like reference symbols in the drawings denote like elements.

1 is a perspective view showing an ink droplet ejection system according to an embodiment of the present invention, FIG. 2 is a plan view schematically showing the system according to FIG. 1, and FIG. 3 is a block showing a control configuration of the system according to FIG. It is also.

Hereinafter, a discharge system and a discharge method for discharging fine ink droplets to functional ink droplets in dot shapes with good accuracy will be described.

1 to 3, the ejection system 100 of an ink droplet according to an embodiment of the present invention, the ejection head 110 having a plurality of nozzles (N) for ejecting the ink droplets, the ejection head ( The head drive unit 120 moving the 110, the discharge object driving unit 140 facing the nozzle N and moving the discharged object 130 is stacked or printed (printed) ink droplets discharged from the nozzle (N), discharge Is provided on one side of the head 110 is moved in the same direction with the discharge head 110, the image pickup unit 150 for taking an image of the object to be discharged 130, the nozzle (N) of any one of the nozzle (N) And an error range setting unit 160 for setting the discharge determination error range EB based on the control unit 170 and a control unit 170 for controlling whether the nozzle N is discharged.

The ink droplet discharging system 100 may include two moving parts moving in directions crossing each other. That is, the discharge head 110 moving in the X-axis direction (see FIG. 2) and the discharged object 130 moving in the Y-axis direction (see FIG. 2) crossing or perpendicular thereto may be provided. A head driver 120 is provided to move the discharge head 110 in the X-axis direction, and the head driver 120 moves the discharge head 120 along the X-axis slider 121 and the X-axis slider 121. It may include a drive motor 123 to. Here, the drive motor 123 may use a linear motor, the X-axis slider 121 functions as a guide rail, one side of the power cable for supplying power to the drive motor 123 (not shown) ) And a cable protector (not shown) for protecting the power cable. Meanwhile, the drive motor 123 and the X-axis slider 121 may be formed of a motor generating a rotational driving force and a ball screw rotating by the motor.

The discharged object 130 moving in the direction crossing or perpendicular to the moving direction of the discharge head 110 may be driven by the discharged object driver 140. The object to be discharged 130 may be provided with a substrate on which a discharge pattern is to be formed. The target object driver 140 includes a set table 147 on which the target object 130 is mounted, and a Y axis table 145 for guiding movement of the set table 147 in the Y-axis direction, and the Y axis table 145. May include a drive motor 143 constituting a drive system in the Y-axis direction and a Y-axis slider 141 driven thereby. Here, a linear motor may be used as the drive motor 143.

In the pattern formation process, the discharge head 110 and the discharged object 130 may be moved alternately or simultaneously. For example, after the ejection head 110 moves in the X-axis direction to position the ejected object 130, the ejected object 130 moves in the Y-axis direction, and ink moves through the nozzle N while the ejected object 130 is moving. As the droplet is discharged, a pattern may be formed. When the to-be-exported object 130 moves and the image pixels arranged along the Y-axis direction are printed, the ejection head 110 moves to the next ejection position, and in this state, the to-be-exposed object 130 moves to the next printing process. This can be done. Here, the movement of the discharge head 110 to the next discharge position is called a swath.

A manual stage (not shown) or a motorized stage (not shown) may be applied to adjust the perpendicularity and the vertical height of the discharge head 110 and the horizontal level from the object 130. On the other hand, when a substrate is used as the object to be printed 130 for pattern printing, the size of the substrate is preferably determined according to the application example.

As the discharge head 110 for discharging ink such as ink, a single nozzle head or multiple nozzle heads may be used. In the discharge system 100 according to the exemplary embodiment of the present invention, hardware may be formed such that a single nozzle head and a multi nozzle are easily compatible with each other. In order to control and drive the discharge head 110, a driver and a pattern generator can be used, and the program can be programmed to convert the waveform and printing algorithm optimized for each head. The optimization software algorithm for the head can be applied immediately.

A plurality of nozzles N may be formed on the lower surface of the discharge head 110, and the nozzles N may be arranged in a line. The discharge head 110 may be connected to the ink supply mechanism 190 to supply ink discharged through the nozzles N. The ink supply mechanism 190 may include an ink storage unit 192 in which ink such as ink is stored. Here, the ink storage unit 192 may be formed in a single or a plurality, it may be provided so that the removable.

On the other hand, on one side of the discharge head 110, the image photographing unit 150 for pattern inspection for photographing the state in which the discharged ink droplets printed on the discharged object 130 while moving along the X-axis direction with the discharge head 110 Can be formed. The image photographing unit 150 may be used not only to observe the printing state of the ink droplets printed on the object 130 using a camera, but also to check the position of the object 130 and the like. To this end, it is preferable that the image capturing unit 150 knows the position information with respect to the position of each nozzle N accurately.

In addition, a drop watcher 180 may be provided at one side of the object to be discharged 130. The ink drop photographing unit 180 may include a CCD camera (not shown) for photographing ink droplets ejected from the ejection head 110, an LED (not shown) for supplying illumination at the time when the CCD camera photographs the ink droplets, and an ejection head. 110 and a controller (not shown) for controlling the operating time of the LED or to adjust the back pressure (pressure) applied to the discharge head (110).

By configuring as described above, the ejection system 100 according to an embodiment of the present invention can observe not only the ejection of the ink droplets but also the behavior of the ink droplets as one system.

Reference numeral “185” shown in FIG. 1 denotes a pneumatic / vacuum control unit.

Meanwhile, the discharge head 110 and the driving motors 123 and 143 may be connected to the controller 170. The controller 170 may include a controller 171 connected to the error setting unit 160 while controlling the ejection system 100 of the ink droplets at the same time. The X-axis slider may be controlled by controlling the X-axis driving motor 123. The Y-axis slider 141 may be driven by driving the 121 and controlling the Y-axis driving motor 143. In addition, the clock signal CLK, the discharge signal SI, the latch signal LAT, and the driving signal COM are inputted to the discharge head 110 through the second interface 173 (see FIG. 3). Nozzle (N) can be controlled.

Here, the error setting unit 160 is a device capable of adjusting the discharge determination error range EB by the user, and may be referred to as a kind of host computer.

In addition, although not shown, the discharge system 100 may include cleaning means for sucking and storing ink droplets of the discharge head 110, or wiping means for wiping the nozzle N surface of the discharge head 110. It may include.

The control structure of the discharge system 100 is demonstrated with reference to FIG. As illustrated in FIG. 3, the controller 170 may include a first interface 172 for acquiring various commands (commands) from the error setting unit 160, driving waveform data, and a discharge pattern image, and a work area for control processing. RAM 174, which is used as a controller, a ROM 175 for storing control data including control programs or various tables for control processing, an oscillation circuit 176 for generating a clock signal CLK, and a discharge head 110. A drive signal generator 178 for generating a drive signal to drive, a second interface 173 for sending data signals or drive signals to the drive motors 123 and 143 and the discharge head 110, and an internal bus. It may include a central processing unit (177, CPU) for controlling each part connected by.

The control configuration of the discharge system 100 is only one example, and may be changed according to required electronic printing performance.

The controller 170 controls the plurality of discharge heads 110 formed on the discharge head 110 according to whether the image pixel P of the object 130 obtained by the image capturing unit 150 is within an emission determination error range EB. It may be determined whether one of the nozzles N is discharged. In other words, if the integer multiple relationship does not hold between the interval between the nozzles N and the interval between the image pixels, the next swath without discharging all the nozzles is not discharged to the image pixels not within the discharge determination error range EB. (swath) can be discharged. As such, by setting the discharge determination error range EB and determining whether to discharge the nozzle, the image precision according to the moving direction of the discharge head 110 may be increased.

Hereinafter, with reference to the drawings, a vector printing method of an ink droplet ejection system according to an embodiment of the present invention will be described.

4 is an exemplary view showing a programmed screen for setting vector printing in the ejection system according to FIG. 1, FIG. 5 is a view showing an example of a pattern to be printed using the ejection system according to FIG. 7 and 8 are flow charts illustrating the steps of vector printing using the discharging system according to FIG. 1. FIG. 7 and 8 are views for explaining a process of printing when the pattern to be printed is a straight line. It is a figure for explaining the process of printing.

A user of the ink ejection ejection system 100 according to an embodiment of the present invention may set or control vector printing using a programmed screen as shown in FIG. 4. Referring to FIG. 4, a program 1 for vector printing of an electronic printing system using a CAD drawing according to an embodiment of the present invention will be described. An image of a pattern to be printed in the image window 2 on the upper left of the screen will be described. , An image or a DeX file is displayed. A pattern type selection window 3 for setting whether to select a print pattern at the bottom of the image window 2 as a sketch or a de-X file may be provided. In the center of the screen there is a main window 4 for adjusting the dot spacing or the discharge amount of the printing pattern.

In the upper right corner, a mode selection button 5 for selecting a line mode for jetting under the influence of acceleration / deceleration and a point mode for jetting without the influence of acceleration / deceleration may be provided. Can be. In the lower right corner, a vector print command button 6 may be provided to command the vector print. Hereinafter, a method of vector printing using such software will be described.

First, an example of a pattern to be printed is shown in FIG. 5. The pattern to be printed is a circle (circle 1) and a closed curve surrounding it. Here, the closed curve is a form in which straight lines (line 1, line 2) and arcs (arc 1, arc 2) are alternately connected. At this time, when generating a print pattern as a De-F file, x, y coordinate values of the start and end points of the straight line (line 1, line 2), x, y coordinate values of the center point of the arc (arc 1, arc 2) You can get information about the starting point angle, the starting point and ending point angles, the radius of the arc, and the x and y coordinates of the circle's center point. In the vector printing method according to an embodiment of the present invention, the length of a pattern to be printed can be obtained using such coordinate information of the de-X file for the pattern to be printed, and the obtained length information is selected through the program screen of FIG. 4. A printing method in which a plurality of discharge points are obtained by dividing the discharge intervals (equal intervals) and each discharge point is discharged.

Referring to FIG. 6, a vector printing method of an electronic printing system using a CAD drawing according to an embodiment of the present invention includes an ejection head 110 and an ejection head 110 having at least one nozzle N from which ink droplets are ejected. The head drive unit 120 moving the 110, the nozzle N, and the discharge object driving unit 140, the discharge head 110 to move the discharged object 130 is printed ink droplets discharged from the nozzle (N) Is provided on one side and moved in the same direction with the discharge head 110 and includes an image capture unit 150 for taking an image of the object to be discharged 130 and a control unit 170 for controlling the discharge of the nozzle (N) In the vector printing method of the ink drop ejection system 100, a step of creating a CAD (CAD) drawing of the pattern to be printed on the to-be-printed object (130), the length of the pattern to be printed divided by the ejection interval ejection point Obtaining step (1200), the discharge point Obtaining coordinate information of a printhead (1300), selecting one nozzle (N) to be discharged from the nozzle (N) (1400) among the nozzles (N), and sequentially following the longitudinal direction of the pattern to be printed. And generating a discharge trigger at the discharge point.

As described above, by dividing the length of the pattern to be printed at equal intervals, ejecting ink at the corresponding ejection point, moving to the next ejection point and performing the next ejection to ensure uniform jetting performance even in the acceleration section and the deceleration section of the ejection head. can do.

At step 1100 of creating a CAD drawing, the CAD drawing may be a DXF file. As described with reference to FIG. 5, since the de-FS file includes coordinate information and angle information of the printing pattern, the coordinate information of the discharge point can be easily obtained.

In step 1200 of obtaining a discharge point by dividing the length of the pattern to be printed by the discharge interval, the length of the pattern to be printed is first obtained. The length can be obtained from the coordinate values of the start point and the end point of the pattern to be printed.

In FIG. 7, the straight line 10 drawn in the horizontal direction without the inclination is a printing pattern, and in FIG. 8, the straight line 210 having the predetermined inclination is a pattern to be printed.

In FIG. 7, the length of the straight line 10 may be obtained from x, y coordinate values of the start point A and the end point B. FIG. When comparing the coordinates (x1, y1) of the starting point (A) and the coordinates (x2, y2) of the end point (B), since the straight line 10 has no slope, y1 and y2 have the same value. Therefore, the length of the straight line 10 is the difference between x1 and x2, that is, x2-x1. When the length of the straight line 10 is obtained, the discharge interval is determined. The discharge point can be obtained by dividing the length of the straight line 10 by a predetermined discharge interval. Here, the discharge interval is the distance or interval between the discharge points.

In FIG. 7, reference numeral 30 denotes a velocity profile of the discharge head 110 moving along the straight line 10 to print the straight line 10. The discharge head 110 accelerates slowly at the first part of the straight line 10 (acceleration section 31) and maintains a constant speed (holding section 32), and slowly decelerates and stops at the end of the straight line 10 (deceleration deceleration). Interval, 33).

According to the vector printing method according to the present invention, a discharge point spaced at equal intervals is obtained from the straight line 10, and the head 110 is stopped after the head 110 is moved so that the nozzle is positioned above the discharge point. Since the discharge is performed at, the discharge drop at the same interval can be obtained in the acceleration section 31 and the deceleration section 33. In FIG. 7, reference numeral 20 denotes a pulse voltage applied to the discharge head 110. The discharge is performed at the point where the discharge trigger 21 is given among the pulse voltages 20, and after discharge is performed with respect to one discharge trigger 21, the nozzle moves to the next discharge point, and the nozzle is discharge trigger 21. Discharge is performed while repeating movement and stop by the interval 22 between. When discharge occurs at the discharge point corresponding to the pulse voltage 20 and the discharge trigger 21, a print result as shown by reference numeral 40 can be obtained. As can be seen from the print result 40, the same drop and the same drop between the discharge points can be obtained for the acceleration section 31, the constant velocity holding section 32 and the deceleration section 33 of the discharge head 110. .

In FIG. 8, a straight line 210 drawn at a predetermined slope is a pattern to be printed. In FIG. 8, the length of the straight line 210 may be obtained from x, y coordinate values of the start point A and the end point B. FIG. Comparing the coordinates (x1, y1) of the starting point (A) and the coordinates (x2, y2) of the end point (B), since the straight line 210 has a predetermined slope, x1 and x2 have different values and y1 and y2 degrees Has a different value. Therefore, the length of the straight line 210 can be calculated | required by the formula which calculates the length of the longest side in a right triangle. Further, a linear equation representing the straight line 210 can be obtained from the coordinates (x1, y1) of the starting point A and the coordinates (x2, y2) of the end point B, and the length of the straight line 210 can be obtained from this equation. have.

Once the length of the straight line 210 is obtained, the discharge interval is determined. The discharge point can be obtained by dividing the length of the straight line 210 by a predetermined discharge interval. Here, the discharge interval is the distance or interval between the discharge points.

In FIG. 8, reference numeral 230 denotes a velocity profile of the discharge head 110 moving along the straight line 210 to print the straight line 210. The discharge head 110 accelerates slowly at the first portion of the straight line 210 (acceleration section 231) and maintains a constant speed (maintenance section 232), and slowly decelerates and stops at the end of the straight line 210 (deceleration deceleration). Interval, 233).

According to the vector printing method according to the present invention, a discharge point spaced at equal intervals is obtained from a straight line 210, and the nozzle 110 is stopped after the head 110 is moved so that the nozzle is positioned above the discharge point. Since the discharge is performed at, the discharge drop at the same interval can be obtained in the acceleration section 231 and the deceleration section 233. In FIG. 8, reference numeral 220 denotes a pulse voltage applied to the discharge head 110. The discharge is generated at the point where the discharge trigger 221 is given among the pulse voltages 220, and after discharge is performed with respect to one discharge trigger 221, the nozzle moves to the next discharge point, and the nozzle is the discharge trigger 221. The discharge is performed while repeating the movement and stop by the interval 222 therebetween. When discharge occurs at the discharge point corresponding to the pulse voltage 220 and the discharge trigger 221, a print result as shown by reference numeral 240 may be obtained. As can be seen from the print result 240, the same drop between the discharge points is the same for the acceleration section 231, the constant velocity holding section 232, and the deceleration section 233 of the discharge head 110, and the same drop can be obtained. .

In the step 1200 of obtaining the discharge point, the discharge interval is equal to the distance between the adjacent discharge points, and the discharge intervals at the start portions 31 and 231 and the end portions 33 and 233 of the patterns 10 and 210 to be printed. May be maintained to be the same as the discharge interval in the center portion (32,232) of the pattern to be printed. That is, the discharge interval is maintained the same throughout the pattern (10,210) to be printed.

In the obtaining of the coordinate information (1300), the coordinates of the point matching the discharge point may be obtained from the coordinate information stored in the DXF file of the pattern to be printed. In this way, the coordinates of the respective discharge points are obtained from the de-FF file, and the position information necessary for stopping or moving the nozzle may be obtained by using the coordinate values of the discharge points.

In the obtaining of the coordinate information (1300), when the pattern to be printed is a straight line, a straight line equation may be obtained, and when the pattern to be printed is a circle or an arc, a starting point, an end point, and an angle of the arc may be obtained. This can also be obtained from the DeX file in the CAD drawing.

Generating a discharge trigger at the discharge point (1500), by discharging the nozzle by generating the discharge trigger (21,221) with the nozzle to be discharged is located above the discharge point, after the discharge the nozzle is discharged to the next You can move sequentially over the points.

On the other hand, the vector printing method according to an embodiment of the present invention can print a pattern that is not the same thickness. That is, the vector printing method according to an embodiment of the present invention may adjust the thickness of the printed pattern. To this end, the vector printing method according to an embodiment of the present invention may further include adjusting the thickness or width of the pattern to be printed.

The adjusting of the thickness or width of the pattern to be printed may include determining whether the number of discharges or the number of discharge triggers at each discharge point is two or more times (1600). Step 1700 of performing the discharge at least once or twice is performed, and if it is not at least two times, moving the nozzle to the next discharge point (1800) and determining whether the discharge point is the last discharge point of the pattern to be printed ( 1900 may be performed.

The adjusting the thickness or width of the pattern to be printed may include adjusting the number of ejection of the nozzle or the number of ejection triggers per ejection point, or adjusting the ejection interval to adjust the thickness or width of the pattern to be printed. I can regulate it.

The printing pattern 310 illustrated in FIG. 9A is a case in which the thickness of the pattern is adjusted by adjusting the number of ejections or the number of ejection triggers. The printing pattern 310 has three thicknesses, the thickness t2 of the second portion 332 is smaller than the thickness t1 of the first portion 331, and the thickness t3 of the third portion is the largest. Accordingly, the thickness of the print pattern 310 may be adjusted by controlling the number of ejections in the second portion 332 to be the least and controlling the number of ejections in the third portion to be the greatest.

Meanwhile, FIG. 9B illustrates a case in which the thickness of the print pattern 410 is adjusted by adjusting the size of the ejection interval, not the number of ejections. The thicknesses t1 and t3 of the first portion 431 or the third portion 433 of the printed pattern 410 are thick because the discharge interval is narrowed, so that the discharge points are large, and the thickness of the second portion 432 and the fourth portion 434 is increased. (t2, t4) becomes thinner because the discharge interval is relatively wide and the discharge points are small.

As such, in the vector printing method according to an embodiment of the present invention, adjusting the thickness or width of the pattern to be printed includes: discharging the number of discharges of the nozzle or the number of discharge triggers twice or more per discharge point; The pattern to be printed may be printed thick by reducing the discharge interval.

The conventional vector printing method discharges two points obtained from the dxf file while moving at a constant frequency. This is based on the assumption that they move at a constant speed during the movement. There is a problem that is printed in bold.

In addition, the conventional raster printing method is a method of printing in the main direction and the auxiliary direction and is discharged to the encoder (encoder) or discharge position while moving in the main direction. The raster printing method uses the position of the encoder or prints exactly on the position so that no position error occurs. However, this method is not efficient for printing diagonal lines or figures. In the vector printing method according to the present invention, in order to eliminate the error of the acceleration section and the deceleration section, the coordinates of all the diagonal lines and the figure are obtained, discharged after moving to the position of this coordinate, and moved to the next position. It can be discharged accurately because it stops and discharges at each position.

The vector printing method according to the present invention may use both a servo motor with an encoder or a stepping motor without an encoder. Another advantage of the vector printing method according to the present invention is that since the discharge is stopped and discharged, it is possible to discharge a specified number of times when stopped. By controlling the number of discharges, there is an advantage of drawing a thick line or a thin line.

If the existing vector printing method is called a line mode, the vector printing method according to the present invention may be referred to as a point mode. The part about thickness by giving thickness information as well as position information is a vector printing method that can control the thickness by controlling the number of discharge triggers. The method of controlling the thickness by adjusting the number of ink droplets at each position and the method of printing by adjusting the ejection interval may be used. When loaded from a Dxf file, this information is saved and used for printing.

The vector printing method according to the present invention can essentially eliminate the printing error between the acceleration section and the deceleration section by using a point mode. In addition, by using the point mode, the thickness of the printing pattern may be adjusted at a time by adjusting the amount of discharge at each discharge point or the number of discharge triggers.

In addition, the vector printing method according to the present invention can adjust the thickness by ejecting once by varying the interval between lines using the point mode according to the thickness.

The vector printing method according to an embodiment of the present invention described so far may be applied to various printing technologies such as an inkjet, a dispensing system, an electrohydraulic printing system, and the like.

As described above, the present invention has been described by specific embodiments such as specific components and the like. For those skilled in the art, various modifications and variations are possible from these descriptions. Accordingly, the spirit of the present invention should not be construed as being limited to the embodiments described, and all of the equivalents or equivalents of the claims, as well as the following claims, belong to the scope of the present invention .

100: discharge system of ink droplets 110: discharge head
120: head drive unit 130: discharged object
140: discharge object driving unit 170: control unit

Claims (9)

A discharge head including at least one nozzle through which ink droplets are discharged, a head driving unit for moving the discharge head, a discharge drive unit facing the nozzle and moving a discharged object to which the ink droplets discharged from the nozzle are printed, the discharge head of the discharge head In the vector printing method of the ink drop ejection system provided on one side and moving in the same direction with the discharge head, including an image photographing unit for photographing the image of the object to be discharged and a control unit for controlling whether or not the ejection of the nozzle,
Creating a CAD drawing of a pattern to be printed on the object to be printed;
Obtaining a discharge point by dividing a length of the pattern to be printed by a discharge interval;
Obtaining coordinate information of the discharge point;
Selecting one of the nozzles to be discharged from the discharge head; And
Generating discharge triggers at the discharge points sequentially along the longitudinal direction of the pattern to be printed;
The interval between the discharge points is the same for the acceleration section, the constant speed maintenance section and the deceleration section of the discharge head, the vector printing method of the electronic printing system using the CAD drawing.
The method of claim 1,
In the step of creating the CAD drawing, the CAD drawing is a DXF file, characterized in that the vector printing method of the electronic printing system using the CAD drawing.
3. The method of claim 2,
In the step of obtaining the discharge point, the discharge interval is equal to the distance between the adjacent discharge point,
And the ejection intervals at the beginning and the end of the pattern to be printed are kept the same as the ejection interval at the center portion of the pattern to be printed.
The method of claim 3,
The step of obtaining the coordinate information is a vector printing method of the electronic printing system using a CAD drawing, characterized in that for obtaining the coordinates of the point matching the discharge point from the coordinate information stored in the DXF file of the pattern to be printed.
5. The method according to any one of claims 1 to 4,
Obtaining the coordinate information,
When the pattern to be printed is a straight line, a linear equation is obtained, and when the pattern to be printed is a circle or an arc, the starting point, the end point, and the angle of the arc are obtained. The vector printing method of the electronic printing system using the CAD drawing.
5. The method according to any one of claims 1 to 4,
Generating a discharge trigger at the discharge point,
The ejection trigger is generated by discharging the nozzle while the nozzle to be discharged is positioned above the discharge point, and after discharging, the nozzle is sequentially moved onto the next discharge point. Vector printing method.
The method according to claim 6,
Adjusting the thickness or width of the pattern to be printed further comprising the vector printing method of the electronic printing system using a CAD drawing.
The method of claim 7, wherein
Adjusting the thickness or width of the pattern to be printed,
The thickness or width of the pattern to be printed is controlled by adjusting the number of ejection of the nozzle or the number of ejection triggers per ejection point, or by adjusting the size of the ejection interval. Vector printing method.
9. The method of claim 8,
Adjusting the thickness or width of the pattern to be printed,
Vector printing of an electronic printing system using a CAD drawing, wherein the number of ejection of the nozzle or the number of ejection triggers of the ejection point per ejection point is two or more times, or the ejection interval is reduced to print the pattern to be printed thickly. Way.

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