KR20130015612A - Array method for inkjet head - Google Patents

Abstract

PURPOSE: A method for aligning an inkjet head is provided to rapidly inspect a position aligning state of a plurality of the inkjet heads and corrects the same, thereby enabling to reduce time required for processing a substrate. CONSTITUTION: A method for aligning an inkjet head is as follows. A control unit arranges a photographing member in the lower part of the inkjet head(1310). The photographing member photographs a nozzle of the inkjet head under the inkjet head so that images are obtained(1320). The photographing member transmits the images to the control unit(1330). The control unit analyzes the images, thereby determining the existence of changes in a position of the inkjet head(1340). [Reference numerals] (1310) Completing setting of a photographing member; (1320) Photographing the nozzle of a head by the photographing member; (1330) Transmitting the photographed image to a control unit; (1340) Analyzing the photographed image by the control unit; (1350) Correcting the position of the head; (1360) Continuing the process; (AA) Start; (BB) Position changed?

Description

Alignment method of inkjet head {ARRAY METHOD FOR INKJET HEAD}

The present invention relates to an alignment method of an inkjet head, and more particularly, to an alignment method of an inkjet head for determining whether the position of the inkjet head is changed by analyzing an image photographing a nozzle of the inkjet head with a plurality of photographing members.

In recent years, liquid crystal displays have been widely used in display units of electronic devices such as mobile phones and portable computers. The liquid crystal display device comprises: a color filter substrate on which a black matrix, a color filter, a common electrode, and an alignment layer are formed; A liquid crystal layer is formed between the thin film transistor (TFT), the pixel electrode, and the array substrate on which the alignment layer is formed, thereby obtaining an image effect by using a difference in refractive index of light according to the anisotropy of the liquid crystal.

As a method of forming a liquid crystal layer between a color filter substrate and an array substrate, there is a liquid crystal injection method or a liquid crystal dropping method. The liquid crystal injection method is a method in which the color filter substrate and the array substrate are bonded to each other by a predetermined interval, and the liquid crystal is injected and filled into the space therebetween.

The liquid crystal dropping method is a method of dropping a liquid crystal in the display area defined by the seal line after forming the seal line in the seal line region on the color filter substrate or the array substrate. After the liquid crystal is loaded, the color filter substrate and the array substrate are aligned, and the liquid crystals are pressed to spread evenly on the entire surface, and the color filter substrate and the array substrate are bonded by curing the seal pattern through UV and heat treatment processes. .

On the other hand, Patent Document 1 discloses a head alignment device of an inkjet printing equipment. However, since the head alignment method disclosed in Patent Document 1 is a method of checking the position of the nozzle using one alignment inspection camera, there is a problem that the head alignment takes a lot of time.

Patent Document 1: Korea Patent Registration 10-0811231 (2008.03.07 notification)

Embodiments of the present invention intend to determine whether the position of the inkjet head is changed by photographing nozzles with two photographing members under the inkjet head and analyzing the photographed image obtained therefrom.

The objects of the present invention are not limited thereto, and other objects not mentioned can be clearly understood by those skilled in the art from the following description.

According to an aspect of the invention, the control unit comprises a first step of positioning the photographing member on the lower side of the inkjet head; A second step of, after the first step, the photographing member photographs a nozzle of the inkjet head under the inkjet head to obtain a photographed image; A third step of transmitting, by the photographing member, the photographed image to the controller after the second step; After the third step, a method of aligning the inkjet head may include a fourth step of the controller analyzing the photographed image to determine whether the position of the inkjet head is changed.

In addition, the second step may include a second step of acquiring a first photographed image by a first photographing member of the photographing members photographing a first nozzle of a nozzle of the inkjet head; A second photographing member of the photographing member disposed adjacent to the first photographing member includes photographing a second nozzle of the nozzle of the inkjet head to obtain a second photographed image; Step 1 and step 2-2 may be performed simultaneously.

In addition, the fourth step may include a step 4-1 in which the controller sets a first virtual line connecting the center of the first captured image to the center of the second captured image; Setting a second virtual line connecting the center of the first nozzle photographed to the first photographed image and the center of the second nozzle photographed to the second photographed image by the controller; The control unit may include a fourth step of determining whether the position of the inkjet head is changed by calculating an intersection angle between the first virtual line and the second virtual line.

According to another aspect of the invention, the base; A gantry spaced upwardly from an upper surface of the base; A liquid crystal supply unit coupled to the gantry; An inkjet head movably coupled to the gantry and provided with a plurality of nozzles on a lower surface thereof so as to eject a liquid crystal supplied from the liquid crystal supply unit in an inkjet manner; A head photographing unit provided on the upper surface of the base and moving in a direction parallel to or perpendicular to a longitudinal direction of the gantry and photographing the nozzles under the inkjet head; The liquid crystal ejection apparatus may include a controller configured to receive the photographed image from the head photographing unit and determine whether the position of the inkjet head is changed.

The head photographing unit may further include: a photographing member photographing the nozzles under the inkjet head; It may be provided on the upper surface of the base, and may include a photographing member moving unit for moving the photographing member in a direction parallel or perpendicular to the longitudinal direction of the gantry.

The photographing member may include: a first photographing member photographing a first nozzle of the nozzles of the inkjet head to obtain a first photographed image; A second photographing member disposed adjacent to the first photographing member and configured to photograph a second nozzle of the nozzles of the inkjet head to obtain a second photographed image; It may include a lighting member for irradiating light to the nozzles of the inkjet head.

In addition, the photographing member moving unit, the slider for supporting the photographing member; A first driving member providing a driving force to move the slider in a direction parallel to the longitudinal direction of the gantry; The slider may include a second driving member for providing a driving force to move in a direction perpendicular to the longitudinal direction of the gantry.

According to an embodiment of the present invention, the position of the plurality of inkjet heads can be determined by analyzing the photographed images of the nozzles of the respective inkjet heads while moving along the alignment direction of the inkjet heads. Quickly inspect and calibrate.

In addition, according to the embodiment of the present invention, the processing step time of the substrate can be shortened.

1 is a view showing the configuration of an inkjet liquid crystal coating equipment.
FIG. 2 is a perspective view of the liquid crystal discharge part of FIG. 1.
3 is a plan view of the liquid crystal discharge part of FIG. 1.
4 shows the nozzles of the head of FIG. 2.
5 is a view showing the side of the head moving unit of FIGS. 2 and 3.
6 is a front view of the first mobile unit of FIG. 5.
7 and 8 are views illustrating an operation process of the head photographing unit of FIG. 2.
9 to 11 are flowcharts illustrating a process of determining whether a head position is changed using the head photographing unit of FIG. 2.
FIG. 12 is a diagram illustrating an example of calculating a position change amount of a head in the fourth step of FIG. 11.

Hereinafter, an alignment method of an inkjet head and a liquid crystal ejecting apparatus using the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, a detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

1 is a view showing the configuration of an inkjet liquid crystal coating equipment.

The liquid crystal coating equipment 1 of FIG. 1 is a facility for applying liquid crystal to a substrate by an inkjet method of discharging droplets. The substrate may be a color filter (CF) substrate or a thin film transistor (TFT) substrate of the liquid crystal display panel, and the liquid crystal may be applied to the entire surface of the color filter (CF) substrate or the thin film transistor (TFT) substrate.

Referring to FIG. 1, the liquid crystal coating apparatus 1 may include a liquid crystal discharge unit 10, a substrate transfer unit 20, a loading unit 30, an unloading unit 40, a liquid crystal supply unit 50, and a main control unit 90. ). The liquid crystal discharge portion 10 and the substrate transfer portion 20 are arranged in a line in the first direction I and can be positioned adjacent to each other. A liquid crystal supply part 50 and a main control part 90 are disposed at positions facing the substrate transfer part 20 with the liquid crystal discharge part 10 as a center. The liquid crystal supply part 50 and the main control part 90 may be arranged in a line in the second direction II. The loading unit 30 and the unloading unit 40 are disposed at positions facing the liquid crystal discharge unit 10 with the substrate transfer unit 20 as a center. The loading section 30 and the unloading section 40 may be arranged in a line in the second direction II.

Here, the first direction (I) is an arrangement direction of the liquid crystal discharge unit 10 and the substrate transfer unit 20, the second direction (II) is a direction perpendicular to the first direction (I) on the horizontal plane, the third direction (III) is a direction perpendicular to the first direction I and the second direction II.

The substrate to which the liquid crystal is to be applied is loaded into the loading unit 30. The substrate transferring unit 20 transfers the substrate loaded into the loading unit 30 to the liquid crystal discharging unit 10. The liquid crystal discharge unit 10 receives liquid crystal from the liquid crystal supply unit 50, and discharges the liquid crystal onto the substrate by an inkjet method of discharging liquid droplets. When the liquid crystal discharge is completed, the substrate transfer unit 20 transfers the substrate from the liquid crystal discharge unit 10 to the unloading unit 40. The substrate coated with the liquid crystal is carried out from the unloading part 40. The main controller 90 controls the overall operations of the liquid crystal discharge unit 10, the substrate transfer unit 20, the loading unit 30, the unloading unit 40, and the liquid crystal supply unit 50.

FIG. 2 is a perspective view of the liquid crystal discharge part of FIG. 1. 3 is a plan view of the liquid crystal discharge part of FIG. 1. 2 and 3, the liquid crystal discharge part 10 includes a base B, a substrate support unit 100, a gantry 200, a gantry moving unit 300, heads 400, and a head moving unit ( 500, the liquid crystal supply unit 600, the head control unit 700, the liquid crystal discharge amount measuring unit 800, the nozzle inspection unit 900, the head cleaning unit 1000, and the head photographing unit 1100.

Base (B) may be provided in a rectangular parallelepiped shape having a constant thickness. The substrate support unit 100 is disposed on the upper surface of the base B. The substrate support unit 100 has a support plate 110 on which the substrate S is placed. The support plate 110 may be a rectangular plate. The rotation driving member 120 is connected to the lower surface of the support plate 110. The rotation drive member 120 may be a rotation motor. The rotation driving member 120 rotates the support plate 110 around a rotation center axis perpendicular to the support plate 100. [

When the support plate 110 is rotated by the rotation driving member 120, the substrate S may be rotated by the rotation of the support plate 110. When the long-side direction of the cell formed on the substrate to which the liquid crystal is to be applied faces the second direction II, the rotation driving member 120 can rotate the substrate such that the long-side direction of the cell is in the first direction I.

The support plate 110 and the rotation driving member 120 may be linearly moved in the first direction I by the linear driving member 130. The linear drive member 130 includes a slider 132 and a guide member 134. The rotation drive member 120 is installed on the upper surface of the slider 132. The guide member 134 is elongated in the first direction I in the center of the upper surface of the base B. A linear motor (not shown) may be incorporated in the slider 132 and the slider 132 is linearly moved in the first direction I along the guide member 134 by a linear motor (not shown).

The gantry 200 is provided at the top of the path through which the support plate 110 is moved. The gantry 200 is spaced apart from the top surface of the base B in the upward direction. The gantry 200 is arranged such that the longitudinal direction thereof is in the second direction II. The heads 400 are coupled to the gantry 200 by the head moving unit 500. The heads 400 may be linearly moved in the longitudinal direction of the gantry 200, that is, the second direction II by the head moving unit 500, and may also be linearly moved in the third direction III. In addition, the heads 400 may rotate about an axis parallel to the third direction III with respect to the head moving unit 500, respectively.

The gantry moving unit 300 linearly moves the gantry 200 in the first direction (I). The gantry moving unit 300 includes a first moving unit 310 and a second moving unit 320. The first mobile unit 310 is provided at one end of the gantry 200, and the second mobile unit 320 is provided at the other end of the gantry 200. The first moving unit 310 slides along the guide rail 315 provided on one side of the base B, and the second moving unit 320 follows the guide rail 325 provided on the other side of the base B. The gantry 200 is linearly moved in the first direction I while slidingly moving.

The heads 400 discharge droplets of liquid crystal onto the substrate. Heads 400 may be provided in plurality. The heads 400 are coupled to the gantry 200 side by side in a second direction (II).

Referring to FIG. 4, a plurality of nozzles 410a and 410b for discharging droplets of liquid crystal are provided on the bottom of the heads 400. For example, the head 410 may be provided with 128 or 256 nozzles 410a and 410b. The nozzles 410a and 410b may be arranged in a row at intervals of a predetermined pitch. The nozzles 410a and 410b may discharge the liquid crystal in an amount of μg.

Each head 400 may be provided with as many piezoelectric elements as the nozzles 410a and 410b. Droplet discharge amounts of the nozzles 410a and 410b may be independently adjusted by controlling voltages applied to the piezoelectric elements.

The head moving unit 500 may be provided to the individual heads 400, respectively. In the present embodiment, since three heads 410, 420, and 430 are provided by way of example, three head moving units 500 may also be provided to correspond to the number of heads. Alternatively, one head moving unit 500 may be provided, in which case the heads 400 may be integrally moved instead of individually moved.

5 is a view showing the side of the head moving unit of FIGS. 2 and 3. 6 is a front view of the first mobile unit of FIG. 5.

5 and 6, the head moving unit 500 includes a first moving unit 520 and a second moving unit 540. The first moving unit 520 linearly moves the individual heads 410 in the longitudinal direction of the gantry 200, that is, in the second direction II. The second moving unit 540 linearly moves the individual heads 410 in the third direction (III) or rotates about an axis parallel to the third direction (III).

The first moving unit 520 includes guide rails 522a and 522b, sliders 524a and 524b, and a moving plate 526. The guide rails 522a and 522b extend in the second direction II and may be spaced apart in the third direction III on the front surface of the gantry 200. Sliders 524a and 524b are movably coupled to the guide rails 522a and 524b, and a linear driver, for example, a linear motor (not shown) may be built in the sliders 524a and 524b. The moving plate 526 is coupled to the sliders 524a and 524b. The upper region of the moving plate 526 is coupled to the slider 524a located above, and the lower region of the moving plate 526 is coupled to the slider 524b located below. As illustrated in FIG. 6, the moving plate 526 linearly moves in the second direction II along the guide rails 522a and 522b by a driving force of a linear motor (not shown). As such, as the heads 410, 420, 430 are individually moved along the second direction II, the distance between the heads 410, 420, 430 may be adjusted.

The second moving unit 540 includes a guide member 542, a slider 544, a detector 546, and a controller 548. The guide member 542 is coupled to the moving plate 526 of the first moving unit 520 and guides the linear movement of the slider 544 in the third direction (III). The slider 544 is rotatably coupled to the guide member 542 about a linear movement in the third direction (III) or about an axis parallel to the third direction (III). The slider 544 may include a linear driver, for example, a linear motor (not shown). In addition, the slider 544 may be a built-in rotary driver. The head 410 is coupled to the slider 544 and is moved in the third direction III by linear movement of the slider 544 in the third direction III.

The detector 546 may be installed in the gantry 200, and detects a gap between the head 410 and the substrate S. Detector 546 may be a laser sensor. The controller 548 generates a control signal corresponding to the detection signal of the detector 546 and transmits a control signal to the linear motor included in the slider 544 to control the driving of the linear motor. If it is determined that the distance between the head 410 and the substrate S is out of the predetermined reference value according to the detection result of the detector 546, the controller 548 controls the driving of the linear motor (not shown) to control the head 410. ) And the distance between the substrate (S).

Referring back to FIG. 3, the liquid crystal supply unit 600 includes a liquid crystal supply module 620 and a pressure regulating module 640. The liquid crystal supply module 620 and the pressure regulation module 640 may be coupled to the gantry 200. The liquid crystal supply module 620 receives the liquid crystal from the liquid crystal supply unit (reference numeral 50 of FIG. 1), and supplies the liquid crystal to the individual heads 410, 420, and 430. The pressure regulation module 640 adjusts the pressure of the liquid crystal supply module 620 by providing a positive pressure or a negative pressure to the liquid crystal supply module 620.

The liquid crystal discharge amount measuring unit 800 measures the liquid crystal discharge amount of the individual heads 410, 420, and 430. The liquid crystal discharge amount measuring unit 800 may be disposed on one side of the substrate support unit 100 on the base B. The liquid crystal discharge amount measuring unit 800 measures the amount of liquid crystal discharged from all the nozzles 410a, 410b (see FIG. 4) for each of the individual heads 410, 420, and 430. By measuring the liquid crystal discharge amount of the individual heads 410, 420, 430, the presence or absence of abnormalities of the nozzles 410a, 410b (see FIG. 4) of the individual heads 410, 420, 430 may be confirmed. That is, when the liquid crystal discharge amount of the individual heads 410, 420, 430 is out of the reference value, it can be seen that at least one of the nozzles 410a, 410b (see FIG. 4) is abnormal.

The heads 410, 420, 430 may be moved in the first direction (I) and the second direction (II) by the gantry moving unit 300 and the head moving unit 500 to be positioned above the liquid crystal discharge amount measuring unit 800. have. The head moving unit 500 may adjust the vertical distance between the heads 410, 420, 430 and the liquid crystal discharge amount measuring unit 800 by moving the heads 410, 420, 430 in the third direction (III).

The nozzle inspection unit 900 checks the abnormality of the individual nozzles provided to the heads 410, 420, and 430 through optical inspection. When the abnormality of the macroscopic nozzle is checked by the liquid crystal discharge quantity measurement unit 800 and it is judged that there is an abnormality in the unspecified nozzle, the nozzle inspection unit 900 checks the existence of abnormality of the individual nozzle, .

The nozzle inspection unit 900 may be disposed on one side of the substrate support unit 100 on the base B. The heads 410, 420, 430 may be moved in the first direction (I) and the second direction (II) by the gantry moving unit 300 and the head moving unit 500 to be positioned above the nozzle inspection unit 900. . The head moving unit 500 may move the heads 410, 420, 430 in the third direction III to adjust the vertical distance between the heads 410, 420, 430 and the nozzle inspection unit 900.

The head cleaning unit 1000 performs a purging process and a suction process. Purging is a process of spraying a part of the liquid crystal contained in the heads 410, 420, and 430 at high pressure. The suction process is a process of sucking and removing liquid crystal remaining on the nozzle faces of the heads 410, 420, and 430 after a purging process.

7 and 8 are views illustrating an operation process of the head photographing unit of FIG. 2.

2, 4, 7 and 8, the head photographing unit 1100 includes a photographing member 1110 and a photographing member moving unit 1160. The photographing member 1110 photographs the nozzles 410a and 410b under the heads 410, 420, and 430. The photographing member moving unit 1160 is provided on the upper surface of the base B, and the photographing member 1110 is parallel to the longitudinal direction of the gantry 200 (ie, the second direction (II)) or the vertical direction ( That is, it moves to the 1st direction (I).

The photographing member 1110 includes a first photographing member 1111, a second photographing member 1113, and an illumination member 1170. The first photographing member 1111 photographs the first nozzle 410a (see FIG. 4) among the nozzles of the head 410 to obtain a first photographed image 810 (see FIG. 12). The second photographing member 1113 photographs the second nozzle 410b (see FIG. 4) among the nozzles of the head 410 to obtain a second photographed image 830 (see FIG. 12). For example, the first photographing member 1111 photographs the first nozzle 410a positioned at one end of the bottom of the head 410, and the second photographing member 1113 is located at the other end of the bottom of the head 410. The second nozzle 410b may be photographed.

The lighting member 1170 irradiates light to the nozzles 410a and 410b of the head 410. For example, the lighting member 1170 may be provided as an LED.

The photographing member moving unit 1160 includes a slider 1120, a first driving member 1130, a second driving member 1140, and a guide body 1150.

The slider 1120 supports the photographing member 1110. The slider 1120 is provided in a rectangular plate shape. The photographing members 1110 may be spaced apart from each other on the slider 1120 by parallel to the second direction II. For example, when the center of the slider 1120 and the center of the first nozzle 410a are coaxially positioned, the first photographing member 1111 is vertically downward of the first nozzle 410a and the second photographing member. 1113 may be positioned in a vertical downward direction of the second nozzle 410b.

The first driving member 1130 provides a driving force to move the slider 1120 in the second direction (II). The second driving member 1140 provides a driving force to move the slider 1120 in the first direction (I). The first driving member 1130 and the second driving member 1140 may be provided as linear motors.

The guide body 1150 provides a space in which the first driving member 1130 and the second driving member 1140 are disposed. The first guide groove 1151 is provided on the upper surface of the guide body 1150 in the second direction (II). The first guide groove 1151 causes the slider 1120 to linearly move in the second direction (II). Second guide grooves 1152 and 1153 are provided at both ends of the first guide groove 1151, respectively. The second guide grooves 1152 and 1153 allow the slider 1120 to linearly move in the first direction (I).

9 to 11 are flowcharts illustrating a process of determining whether a head position is changed using the head photographing unit of FIG. 2.

Referring to Figures 2 and 9 to 11, the process of determining whether the position of the head changes.

The controller 90 (see FIG. 1) positions the photographing member 1110 under the head 410 (first step 1310). At this time, the controller 90 sets the position of the photographing member 1110 by operating the first driving member 1130 (see FIG. 7) or the second driving member 1140 (see FIG. 7). Subsequently, the controller 90 acquires photographed images 1410 and 1430 by photographing the nozzles 410a and 410b of the head 410 under the head 410 (see FIG. 12). Step 2,1320). In this case, the first photographing member 1111 (see FIG. 7) photographs the first nozzle 410a (steps 2-1 and 1321), and the second photographing member 1113 (see FIG. 7) the second nozzle ( 410b) (steps 2-2 and 1323). Meanwhile, steps 2-1 and 2-2 may be performed at the same time. Alternatively, steps 2-1 and 2-2 may be performed sequentially. Subsequently, the photographing member 1110 transmits the photographed images 1410 and 1430 to the controller 90 (third step 1330). Subsequently, the controller 90 analyzes the photographed images 1410 and 1430 to determine whether the head 410 is changed in position (step 1340, 4th step). For example, referring to FIGS. 11 and 12, the controller 90 may include a first virtual line connecting the center IO1 of the first captured image 1410 and the center IO2 of the second captured image 1430. L1) is set (step 4-1, 1431). Subsequently, the controller 90 controls the center NO1 of the first nozzle 410a captured by the first captured image 1410 and the center NO2 of the second nozzle 410b captured by the second captured image 1430. ) And set the second virtual line L2 (steps 4-2 and 1343). Subsequently, the controller 90 crosses an angle between the first virtual line L1 and the second virtual line L2 based on the point CO at which the first virtual line L1 and the second virtual line L2 meet. (θ) is calculated (step 4-3, 1345). Here, if the crossing angle θ is within the error range, the controller 90 determines that the head 410 is in the normal position. If the crossing angle θ is outside the error range, the controller 90 determines that the position of the head 410 is not. It is determined that it has changed. When it is determined that the position of the head 410 is changed (1350), the controller 90 corrects the position of the head 410 and performs the second step 1320 again. If it is determined that the position of the head 410 is normal (1360), the controller 90 continues the process.

Through this process, after determining whether the position of the head 410 is changed, the controller 90 determines whether the position of the head 420 is changed by moving the photographing member 1110 in the second direction (II).

On the other hand, after the above-described process, after correcting the position of each of the heads 400 side by side in the second direction (II), it is determined whether the entire head 400 is arranged side by side in the second direction (II) If you want to judge, you can use the following method.

For example, the first nozzle 410a of the head 410 is photographed by the first photographing member 1111, and the photographing member 1110 is moved along the first guide groove 1151 in the second direction (II). Thereafter, the second photographing member 1113 photographs the second nozzle of the head 430 (which corresponds to the second nozzle 410b of the head 410). At this time, when the second nozzle is not captured in the captured image of the head 430 by the second photographing member 1113, the controller 90 moves the photographing member 1110 to the second guide groove 1153. Next, the head 430 is photographed by the second photographing member 1113 by moving in the first direction (I). By using the photographed images acquired through the above process and the movement amount of the photographing member 1110 moved in the first direction (I), it may be determined whether the second direction (II) of the entire heads 400 is aligned. .

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention.

Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The protection scope of the present invention should be interpreted by the following claims, and all technical ideas within the equivalent scope should be interpreted as being included in the scope of the present invention.

** Explanation of symbols on the main parts of the drawing **
100: substrate support unit 200: gantry
300: gantry moving unit 400: heads
500: head moving unit 600: liquid crystal supply unit
800: liquid crystal discharge amount measurement unit 900: nozzle inspection unit
1000: head cleaning unit 1100: head photographing unit
1110: photographing member 1120: slider
1150: the guide body 1170: lighting member

Claims (2)

In the inkjet head alignment method,
A first step of the controller locating the photographing member under the inkjet head;
A second step of, after the first step, the photographing member photographs a nozzle of the inkjet head under the inkjet head to obtain a photographed image;
A third step of transmitting, by the photographing member, the photographed image to the controller after the second step;
After the third step, the control unit analyzes the photographed image to determine whether the position of the inkjet head fluctuated
Alignment method of an inkjet head comprising a. The method of claim 1,
The second step comprises:
Step 2-1 of the first photographing member of the photographing member to photograph the first nozzle of the nozzle of the inkjet head to obtain a first photographed image;
A second photographing member of the photographing member disposed adjacent to the first photographing member includes a second step of photographing a second nozzle of the nozzle of the inkjet head to obtain a second photographed image;
And the steps 2-1 and 2-2 are simultaneously performed.

Images