KR101144769B1 - Screen printing system - Google Patents

Abstract

A screen printing system is disclosed. The system includes a case partitioning an internal space; A first screen printing unit and a second screen printing unit disposed in the inner space, each including a conveyor belt; And a control unit controlling an operation of the pair of screen printing units.

Description

Screen printing system

The present invention relates to a screen printing system.

In the process of manufacturing a solar cell, in order to accurately form fine patterns such as a front electrode and a back electrode on a wafer, an apparatus is used in which the transferred wafer is left still, the position is detected, and the electrode is printed using a conductive paste. . As an example of such an apparatus, according to the prior art, the position of the transferred wafer is recognized by using a camera to correct the position of the wafer, and the table on which the wafer is seated is moved and fixed in the horizontal, vertical and rotation directions, respectively. For example, a system using a squeegee for printing by moving a table toward a fixed screen has been used.

However, according to the related art, in order to increase throughput, the number of processing lines including a table on which a wafer is seated and a screen mesh for patterning must be increased by that much. This raises costs and increases the space occupied by the equipment.

Therefore, it is necessary to develop a screen printing system that can increase space utilization while improving throughput without excessive cost increase.

The present invention provides a screen printing system capable of increasing space utilization while improving throughput without undue cost increase.

According to an aspect of the invention, the case for partitioning the inner space; A first screen printing portion and a second screen printing portion disposed in the inner space, each comprising a conveyor belt, wherein the conveyor belt of the first screen printing portion and the conveyor belt of the second screen printing portion are disposed side by side; And a control unit for controlling all operations of the pair of screen printing units.

Here, the first screen printing unit and the second screen printing unit, each conveyor belt for transferring a substrate; A table disposed below the conveyor belt to support the transferred substrate; An alignment sensor unit for sensing an alignment state of the substrate located on the table; A table lifter for moving the table up and down; A screen assembly positioned on an upper side of the table, the screen assembly including a screen whose position is corrected according to an alignment state of the substrate; And a screen lifter for moving the screen assembly up and down.

In this case, the screen assembly of the first screen printing portion and the screen assembly of the second screen printing portion may be located in diagonal directions with each other.

In addition, the rear of the table may be provided with a tester for inspecting whether the substrate is completed screen printing.

An inspection belt may be provided below the inspector to support and transport both ends of the substrate, and the inspection belt may intersect with the advancing direction of the inspection belt so that the substrate determined as defective by the inspector is discharged. Discharge belt actuated in the direction may be located.

In order to prevent movement of the substrate located on the table, a negative pressure hole for supplying a negative pressure may be formed in the table, and a groove may be formed in the upper surface of the table to insert the conveyor belt.

The alignment sensor unit may be positioned below the table, and at this time, the table may be provided with a transparent area so that the alignment sensor unit can detect the alignment state of the substrate.

The sensor unit may include a first sensor detecting a rear surface of the substrate; A second sensor for sensing a side surface of the substrate; And a third sensor configured to detect a rotation state of the substrate. In this case, the first sensor, the second sensor and the third sensor may include a lighting means and a camera, respectively.

The screen assembly may include a lower frame having a first opening in the center; The screen is fixed to the lower side of the lower frame; an upper frame, positioned above the lower frame, the upper frame having a second opening hole corresponding to the first opening hole; A pair of guide parts positioned on an upper side of the upper frame to face each other with respect to the second opening hole; Both ends of the support bar being supported by the pair of guide parts and movable along the longitudinal direction of the guide part; And a squeegee assembly coupled to the support bar and penetrating through the second opening hole and the first opening hole to print a paste applied on the screen onto the substrate.

The guide part may be a conveyor belt, and the support bar may be moved by a servo motor driving the guide part.

The screen lifting unit may be arranged to be spaced apart along the edge of the lower frame to support the lower frame, the plurality of screen support legs extending up and down; And a motor for moving the screen support leg up and down using a gear train. In this case, the conveyor belt and the table may be located on a table frame, and the table frame may be formed with an opening hole through which the screen support leg passes.

The conveyor belt is coupled to a belt frame, the table lifting unit is arranged to be spaced apart along the edge of the table to support the table, a plurality of table support legs extending up and down; And it may include a cylinder for moving the belt frame up and down.

It may further include a substrate detection sensor positioned in front of the table to sense the transfer of the substrate, and adjusts the operation of the conveyor belt so that the substrate is located on the table to stop.

According to a preferred embodiment of the present invention, it is possible to provide a screen printing system that can increase space utilization while improving throughput without excessive cost increase.

1 is a perspective view showing the appearance of a screen printing system according to an embodiment of the present invention.
Figure 2 is a plan view showing the interior of the screen printing system according to an embodiment of the present invention.
3 is an exploded perspective view showing a printing screen unit;
4 is a plan view of the transfer assembly;
5 is a plan view showing a printing conveyor belt portion;
6 is a perspective view of a table assembly;
7 is a plan view showing a state in which a table is removed from a table assembly.
8 is a side view showing the table assembly.
9 is a plan view of the screen assembly.
10 is a side view showing the transfer assembly.
11 is a perspective view showing a tester;
12 is a cross-sectional view showing a tester.

BRIEF DESCRIPTION OF THE DRAWINGS The present invention is capable of various modifications and various embodiments, and specific embodiments are illustrated in the drawings and described in detail in the detailed description. However, this is not intended to limit the present invention to specific embodiments, it should be understood to include all transformations, equivalents, and substitutes included in the spirit and scope of the present invention. In the following description of the present invention, if it is determined that the detailed description of the related known technology may obscure the gist of the present invention, the detailed description thereof will be omitted.

The terms first, second, etc. may be used to describe various components, but the components should not be limited by the terms. The terms are used only for the purpose of distinguishing one component from another.

The terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting of the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this application, the terms "comprise" or "have" are intended to indicate that there is a feature, number, step, operation, component, part, or combination thereof described in the specification, and one or more other features. It is to be understood that the present invention does not exclude the possibility of the presence or the addition of numbers, steps, operations, components, components, or a combination thereof.

Hereinafter, a preferred embodiment of the screen printing system according to the present invention will be described in detail with reference to the accompanying drawings, in the description with reference to the accompanying drawings, the same or corresponding components are given the same reference numerals and duplicated thereto. The description will be omitted.

The screen printing system according to the present embodiment can be used to form an electrode by printing a conductive paste on the front side and / or rear side of a substrate such as a wafer. This screen printing system, as shown in Figure 1, the appearance is formed by the case 1000. On one side of the case 1000, a discharge port 1130 for discharging the substrate on which the screen printing is completed may be formed, and the display 1110 for checking the working status in a predetermined position on the front surface and for manually inputting a work command. An input device 1130 such as a touch screen may be provided.

Referring to FIG. 2, the screen printing system according to the present embodiment includes a plurality of facilities for screen printing, that is, screen printing units 2000A and 2000B, in an inner space of a case so that a plurality of substrates may be simultaneously transferred and processed. It is provided with.

For example, with reference to FIG. 2, the substrate is transferred from left to right. In addition, paste feeders 3000A and 3000B for supplying paste to the respective screen printing units 2000A and 2000B are provided at predetermined positions in the case 1000, and screen printing is performed by the screen printing units 2000A and 2000B. Inspectors 4000A and 4000B for inspecting the completed substrates are provided at the rearmost, i.e. rightmost, side inside the case. In addition, the control unit 5000 in charge of the control of various operations of the screen printing system according to the present embodiment is located at a predetermined position in the case 1000.

3 illustrates the structure of the screen printing unit 2000A. In FIG. 3, only the screen printing unit 2000A (hereinafter referred to as “first screen printing unit”) located relatively forward is shown in FIG. Since the screen printing unit also has a structure corresponding to the first screen printing unit 2000A, a detailed description thereof will be replaced with the description of the first screen printing unit 2000A.

As shown in FIG. 3, in the present embodiment, the screen printing unit 2000A presents the screen assembly 2200A, the transfer assembly 2100A, and the screen lifting unit 2300A, but is not limited thereto.

The transfer assembly 2100A receives a substrate, supports the substrate while screen printing is in progress, and transfers the substrate on which screen printing is completed to a subsequent process. In this embodiment, the conveying assembly 2100A is a plate-shaped table frame 2140 and a printing conveyor belt portion disposed in parallel with each other on the table frame 2140 (see 2100A-1 and 2100B-1 in FIG. 4). ) And the transfer conveyor belt portion (see 2100A-2 and 2100B-2 in FIG. 4).

The printing conveyor belt parts 2100A-1 and 2100B-1 are areas in which the screen printing process is performed by the screen assembly (see 2200A in FIG. 3) located on the upper side thereof, and are positioned in series as shown in FIG. And a front conveyor belt portion 2120, a table assembly 2110, and a rear conveyor belt portion 2130. Here, the front conveyor belt unit 2120 performs a function of supplying a substrate to the table assembly 2110, and the rear conveyor belt unit 2130 performs a function of transferring a substrate on which screen printing is completed to a subsequent process. In addition, the table assembly 2110 supports a substrate during a screen printing process on the substrate.

On the other hand, as shown in Figure 4, the transfer conveyor belt portion 2100A-2 provided in the first transfer assembly 2100A located in the relatively front, screen printing is to be carried out in the second transfer assembly 2100B located at the rear. It serves to supply the substrate. That is, screen printing is not performed in the transfer conveyor belt portion 2100A-2 positioned on the first transfer assembly 2100A, and only the substrate transfer to the second transfer assembly 2100B is performed.

Similarly, the transfer conveyor belt part 2100B-2 provided in the second transfer assembly 2100B performs a function of transferring a substrate on which screen printing is completed in the first transfer assembly 2100A to a subsequent process.

Meanwhile, in order to efficiently use the space of the screen printing system, two transfer assemblies 2100A and 2100B neighboring each other, more specifically, two adjacent table frames 2140 are disposed to be offset from each other. That is, only a part of the neighboring surfaces of the two transfer assemblies 2100A and 2100B face each other. The print conveyor belt portions 2100A-1 and 2100B-1 and the transfer conveyor belt portions 2100A-2 and 2100B-2 are positioned in the opposing regions. More specifically, the print conveyor belt portion 2100A-1 provided in the first conveyance assembly 2100A and the transfer conveyor belt portion 2100B-2 provided in the second conveyance assembly 2100B are arranged in series and have a first conveyance. The transfer conveyor belt portion 2100A-2 provided in the assembly 2100A and the print conveyor belt portion 2100B-1 provided in the second transfer assembly 2100B are arranged in series.

As shown in FIG. 3, the screen assembly 2200A is positioned above the transfer assembly 2100A, more specifically above the table assembly 2110, and performs a screen printing process on the surface of the substrate. The screen lifter 2300A moves the screen assembly 2200A up and down. In the present embodiment, as shown in FIG. 2, two screen assemblies are also provided, and two screen assemblies are also displaced as in the case of the transfer assembly. Specific description thereof will be described later.

6 is a perspective view illustrating the table assembly 2110, and FIG. 7 is a plan view illustrating a state in which the table 2112 is removed from the table assembly 2110. The table assembly 2110 is a place where the transferred substrate is stopped for a predetermined time, and is a place where the screen printing process is performed by the screen assembly 2200A located above.

According to this embodiment, an inline method of transferring a substrate using a conveyor belt is used. By applying the inline type in this way, it is possible to improve the yield by enabling continuous processing. On the other hand, as the conveyor belt for transporting the substrate, as shown in Figure 6, a pair of belts (2111-1, 2111-2) which are spaced apart from each other to support both ends of the substrate may be used, and other It is of course possible to use the form. The conveyor belts 2111-1 and 2111-2 may be coupled to and driven by a belt frame 2116 having a roller 2117 or the like.

Tables 2112 for supporting the transferred substrate are located at predetermined positions below the conveyor belts 2111-1 and 2111-2. The table 2112 is positioned in the movement path of the substrates conveyed by the conveyor belts 2111-1 and 2111-2, and serves to support the transferred substrates.

On the other hand, in front of the table 2112, for example, above the front conveyor belt portion 2120, as shown in Figure 5, a substrate detection sensor 2122 for detecting the transfer of the substrate may be located. The substrate detection sensor 2122 may detect a substrate that is transferred toward the table assembly 2110 and perform a function of accurately positioning the substrate on the table 2112 and stopping the substrate 2112. To this end, after the substrate detection sensor 2122 detects the transfer of the substrate, the operation of the conveyor belts 2111-1 and 2111-2 stops after a predetermined time (for example, about 1.5 seconds). Etc. can be used.

On the other hand, in order to prevent the movement of the substrate located on the table 2112, a negative pressure hole 2115 for supplying a negative pressure may be formed in the table 2112. When the negative pressure hole 2115 is formed in the table and the negative pressure is supplied by using a pump (not shown), the substrate placed on the table 2112 comes into close contact with the table 2112, and the alignment state is maintained even when the table is moved. It will not be disturbed.

On the other hand, the groove 2114 may be formed on the upper surface of the table 2112 so that the conveyor belts 2111-1 and 2111-2 are inserted. When the grooves 2114 are formed in the table in this way, it is possible to prevent the substrate from being separated more than necessary on the table 2112 by the conveyor belts 2111-1 and 2111-2 located above the table 2112. Thus, more stable support by the table 2112 can be enabled.

The alignment sensor unit (refer to 2119-1, 2119-2, and 2119-3 in FIG. 7, hereinafter referred to as '2119') senses an alignment state of the substrate located on the table 2112. That is, in order to secure the degree of matching between the screen for screen printing (see 2230 of FIG. 10) and the substrate, first, the alignment of the substrate is detected. In this embodiment, the alignment sensor unit 2119, the camera and the lighting means located on the lower side of the table is presented. In this case, the transparent sensor 2113-1, 2113-2, and 2113-3, commonly referred to as '2113', are provided on the table so that the alignment sensor unit 2119, that is, the camera, can detect the alignment state of the substrate. Here, the transparent region 2113 does not mean completely transparent, but should be interpreted to include a case where the transparent region 2113 is semitransparent enough to optically detect the alignment of the substrate. In this embodiment, a structure in which quartz is provided in the transparent region 2113 is presented.

On the other hand, the alignment sensor unit 2119 is a first sensor 2119-1 for detecting the rear surface of the substrate, the second sensor 2119-2 for detecting the side surface of the substrate, the rotation state of the substrate It may include a third sensor (2119-3) for detecting the. In this case, the first and second sensors 2119-1 and 2119-2 are used to detect edges of the rear and side surfaces of the substrate, thereby aligning the substrates in the X and Y axes. The error can be determined, and the alignment error in the rotation direction of the substrate can be determined using the third sensor 2119-3.

When the alignment of the substrate is sensed, the table 2112 and the substrate (not shown) positioned on the table are raised by the table lifter 2118. The table lifting unit 2118 performs a function of raising and lowering the table 2112 by a predetermined height. As the table lifter 2118, as shown in FIGS. 7 and 8, the table lifter 2118 is disposed to be spaced apart along the edge of the table 2112 to support the screen 2112 screen assembly, and supports a plurality of tables that can be extended vertically. The leg 2118a and the cylinder 2118b which moves the belt frame 2116 up and down can be used. Each of the table support legs 2118a may be fastened to the support frame 2118c to improve assembly. In addition, various power transmission structures such as a linear actuator (not shown) and a gear train (not shown) may be used.

Meanwhile, as shown in FIG. 3, a screen assembly 2200A having a screen (see 2230 of FIG. 10) for screen printing is positioned above the table 2112. 9 shows a top view of the screen assembly 2200.

At this time, the alignment state of the previously detected substrate is transmitted to the screen 2230 by the control unit (see 5000 of FIG. 2), and used to correct the position of the screen 2230. That is, the position of the screen 2230 is corrected based on the information about the alignment state of the substrate, so that the registration between the screen 2230 and the substrate may be performed. To this end, a plurality of servomotors 2211-1, 2211-2, and 2211-3 of FIG. 9 may be used. In this case, each of the servo motors 2211-1, 2211-2, and 2211-3 is operated based on the sensed information on the alignment state of the substrate to move the screen 2230 to match the substrate. .

According to the present embodiment, despite the plurality of screen printing units 2000A and 2000B, various operations can be controlled by only one control unit 5000, so that the manufacturing cost of the system can be greatly reduced, The space occupied by the facility also has the advantage of saving.

As illustrated in FIG. 7, the screen assembly 2200A includes a lower frame 2210 having a first opening (see 2213 in FIG. 3) formed at the center thereof; An upper frame 2220 positioned above the lower frame 2210; A pair of guide parts 2221-1 and 2221-2 positioned on an upper side of the upper frame 2220; Both ends are supported by the pair of guide parts (2221-1, 2221-2), the support bar (2222) movable along the longitudinal direction of the guide parts (2221-1, 2221-2); And a squeegee assembly 2223 coupled to the support bar 2222 and printing the paste applied on the screen 2230 on the substrate.

The lower frame 2210 generally has a plate shape, and a first opening hole 2213 is formed at the center thereof. In this case, as shown in FIGS. 9 and 10, the screen 2230 is fixed to the lower side of the lower frame 2210. As a result, the top surface of the screen 2230 may be exposed by the first opening hole 2213. Meanwhile, a plurality of servomotors 2211-1, 2211-2, and 2211-3 for position correction of the screen 2230 may be positioned on the lower frame 2210.

3, 9 and 10, the upper frame 2220 is spaced apart from the lower frame 2210 by a predetermined distance. A second opening hole 2225 corresponding to the first opening hole 2213 is formed at the center of the upper frame 2220. As a result, the top surface of the screen 2230 may be exposed by the first opening hole 2213 and the second opening hole 2225.

On the upper frame 2220, a pair of guide parts 22211-1 and 2221-2 are provided to face each other with respect to the second opening hole 2225. The guide parts 2221-1 and 2221-2 may serve to guide the linear motion of the squeegee assembly 2223, more specifically, the support bar 2222, which will be described later. Conveyor belts can be used as the guide parts 2221-1 and 2221-2. In this case, the guide parts 2221-1 and 2221-2 may be driven by the servo motor 2224.

Both ends of the support bar 2222 are supported by the guide parts 2221-1 and 2221-2, respectively. As a result, the support bar 2222 has a shape that crosses the first opening hole 2213 and the second opening hole 2225. On the other hand, as described above, when the guides 2221-1 and 2221-2 are made of the conveyor belts 1210-1 and 1210-2, the support bars are driven by driving the conveyor belts 1210-1 and 1210-2. The linear movement of the support bar 2222 can be guided through the manner in which the 2222 is transferred.

The support bar 2222 is coupled to the squeegee assembly 2223 to perform screen printing. The squeegee assembly 2223 has a shape suspended from a predetermined position of the support bar 2222, and the first opening hole 2213 and the second opening hole 2225 respectively formed in the lower frame 2210 and the upper frame 2220, respectively. ) Is positioned above the screen 2230. At this time, the squeegee assembly 2223 may move in the X direction by the movement of the support bar 2222, and may move in the Y direction along the longitudinal direction of the support bar 2222. As a result, when paste is applied to the upper surface of the screen 2230 from a separate paste feeder (see 3000A and 3000B in FIG. 2), the squeegee assembly 2223, more specifically, the squeegee provided at the end of the squeegee assembly (FIG. 10). 2223S closely adheres along the top surface of the screen 2230 and moves in the X and / or Y direction so that a predetermined pattern corresponding to the pattern (not shown) formed on the screen 2230 is printed on the surface of the substrate. It becomes possible.

Meanwhile, the screen assembly 2200A provided with the screen 2230 may be moved up and down by the screen lifter 2300A. 3 and 10, the screen lifting unit 2300A is spaced apart along the edge of the lower frame 2210 to support the lower frame 2210 and extend upward and downward. A plurality of screen support legs 2310; And a motor 2320 for moving the screen support leg 2310 up and down using a gear train 2310 having a worm gear and the like. The screen lifter 2300A having such a structure allows the screen 2230, which has been matched with the substrate, to descend to reach the substrate positioned on the table, and thereafter, screen printing using the squeegee assembly 2223 may be performed. It becomes possible.

3 and 10, an opening hole 2141 through which the screen support leg 2310 penetrates may be formed in the table frame 2140. In this case, a support plate 2311 may be provided at a predetermined position of the screen support leg 2310 to support the lower surface of the table frame 2140. FIG. 10 shows the upper end 2311E of the screen support leg passing through the table frame 2140 to support the lower frame 2210.

Meanwhile, in the present embodiment, the screen lifting unit 2300A having the above structure is provided, but various power transmission structures such as a hydraulic cylinder may also be used.

When printing is completed in this way, the screen assembly 2200A is raised to return to the original position, the table 2112 is lowered to the original position. When the table 2112 is lowered to its original position, the conveyor belts 2111-1 and 2111-2 operate again to transfer the substrate to the subsequent process line through the rear conveyor belt 2130.

Meanwhile, as shown in FIG. 2, in order to perform inspection of the substrate on which screen printing is completed by the screen printing units 2000A and 2000B, the inspectors 4000A and 4000B are located behind the second screen printing unit 2000B. Is located. Hereinafter, the structure and function of the testers 4000A and 4000B will be described with reference to FIGS. 2, 10, and 11.

According to the present exemplary embodiment, two inspectors 4000A and 4000B are provided to determine whether the two substrates on which the screen printing process is performed by the two screen printing units 2000A and 2000B are defective. The inspector (4000A, hereinafter referred to as a “first inspector”) located on the upper side relative to FIG. 2 performs a defect on the substrate on which the screen printing process is performed in the first screen printing unit 2000A, and is relatively As a lower tester (not shown in FIG. 11, 4000B of FIG. 12, hereinafter referred to as a “second tester”), the second screen printing unit 2000B performs a defect on the substrate on which the screen printing process is performed. . Hereinafter, the structure and the function of the first inspector 4000A will be described. Since the structure and function of the second inspector 4000B correspond to that of the first inspector 4000A, a detailed description thereof will be replaced with the description of the first inspector 4000A.

The first inspector 4000A is configured to transfer the substrate conveyed through the print conveyor belt portion 2100A-1 of the first screen printing portion 2100A and the transfer conveyor belt portion 2100B-2 of the second screen printing portion 2100B. Check the print status for defects. The substrate supplied to the first inspector 4000A can be continuously supplied by an inspection belt located below the first inspector 4000A.

The first inspector 4000A is positioned above the center of the inspection belts 4100-1 and 4100-2, and the substrate to be inspected is inspected by the inspection belts 4100-1 and 4100-2. It is transported to the lower side of) and stopped. To this end, the sensor 4600 may be provided near the front of the inspection belts 4100-1 and 4100-2. The sensor 4600 may perform a function of causing the substrate to stop below the first inspector 4000A through the same principle as the substrate detection sensor 2122 of FIG. 5 described above.

When the substrate reaches the first inspector 4000A, the first inspector 4000A optically inspects the surface of the substrate to acquire information, and compares the previously input specification with the acquired information. As a result of the comparison, when the acquired information exceeds the allowable error range, the corresponding board is determined to be defective, otherwise the board is determined to be good.

The substrate determined to be defective needs to be discharged from the production line so as not to proceed to a subsequent process. To this end, between the pair of inspection belts 4100-1 and 4100-2, discharge belts 4200-1 and 4200-2 operating in a direction intersecting with the traveling directions of the inspection belts 4100-1 and 4100-2. ) Is provided.

The discharge belts 4200-1 and 4200-2 may be positioned lower than the inspection belts 4100-1 and 4100-2 so as not to interfere with the normal transfer of the substrate. However, if it is determined that the substrate is defective as a result of the inspection, the discharge belts 4200-1 and 4200-2 are raised and positioned higher than the inspection belts 4100-1 and 4100-2, so that the substrates are inspected. 4100-2 can be moved, that is, discharged in a direction different from the traveling direction. As such, in order to raise the discharge belts 4200-1 and 4200-2, as illustrated in FIG. 12, the frame 4500 on which the discharge belts 4200-1 and 4200-2 are supported using the cylinder 4400. You can use the method of elevating).

An ejector 4300 may be provided at the front of the discharge belts 4200-1 and 4200-2 in the traveling direction to guide the discharged substrate. The ejector 4300 may have a downwardly inclined shape as shown in FIGS. 10 and 11.

On the other hand, if the inspection result is determined that the substrate is normal, the inspection belts 4100-1 and 4100-2 which have been stopped are operated again to transfer the substrate to subsequent processes.

In the above description of the structure of the screen printing system according to an aspect of the present invention, the operation of the screen printing system will be described below.

First, the substrate is supplied by the conveyor belts 2111-1 and 2111-2 and placed on the table 2112. More specifically, the substrate supplied through the print conveyor belt portion 2100A-1 of the first transfer assembly 2100A is positioned on the table 2112 of the first transfer assembly 2100A, and the first transfer assembly ( The substrate supplied through the transfer conveyor belt portion 2100A-2 of 2100A is positioned on the table of the second transfer assembly 2100B past the first transfer assembly 2100A.

The table 2112 is located in a predetermined space below the conveyor belts 2111-1 and 2111-2 in the movement path of the substrate, and supports the transferred substrate.

When the substrate is positioned on the table 2112, the alignment of the substrate is sensed. This is to ensure the degree of matching between the screen 2230 and the substrate for screen printing. In this case, the rear and side edges of the substrate are sensed using the first sensor 2119-1 and the second sensor 2119-2, and alignment errors in the X and Y axes of the substrate are detected therefrom. Can be determined, and the rotation state of the substrate, that is, the alignment error in the rotation direction, can be determined using the third sensor 2119-3.

After that, the table 2112 on which the substrate is placed is raised. On the other hand, the alignment state of the previously detected substrate is transmitted to the screen assembly 2200A by the controller (5000 of FIG. 2), the position of the screen 2230 is corrected according to the alignment state of the substrate. That is, by correcting the position of the screen 2230 based on the information on the alignment state of the substrate, the registration between the screen 2230 and the substrate can be achieved.

Thereafter, the screen 2230 is lowered and positioned on the upper surface of the substrate, and paste applied to the upper surface of the screen 2230 by the paste feeders 3000A and 3000B is patterned on the surface of the substrate by the squeegee assembly 2223. Is printed.

When printing is completed, the screen assembly 2200A is raised and returned to its original position, and the table 2112 is lowered again. When the table 2112 is lowered to its original position, the substrate is transferred toward the inspector.

When the substrate having the pattern formed on the surface reaches the inspector by the screen printing process, the inspectors 4000A and 4000B inspect the surface of the substrate to acquire information, and compare the previously input specification with the acquired information to determine whether the substrate is defective. Will be determined.

The substrate determined to be normal continues to be transferred to the subsequent process. However, if the substrate is determined to be defective, the discharge belts 4200-1 and 4200-2 are raised, and the substrate determined as defective by the raised discharge belts 4200-1 and 4200-2 is in a normal traveling direction. Cross direction. That is, it is discharged to the side.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention as defined in the appended claims. It will be understood that the invention may be varied and varied without departing from the scope of the invention.

Many embodiments other than the above-described embodiments are within the scope of the claims of the present invention.

1000: Case 2000A, 2000B: Screen printing part
2112: tables 2113-1, 2113-2, and 2113-3: transparent areas
2115: sound pressure hole 2118: table lifting unit
2119-1, 2119-2, 2119-3: alignment sensor
2122: substrate detection sensor 2200A: screen assembly
2210: lower frame 2220: upper frame
2221-1, 2221-2: guide part 2222: support bar
2223: squeegee assembly 2230: screen
2300A: Screen lifting unit 2310: Screen support leg
3000A, 3000B: Paste Feeder 4000A, 4000B: Checker
4100-1, 4100-2: Inspection belt 4200-1, 4200-2: Discharge belt
5000: control unit

Claims (16)

A case partitioning the inner space;
A first screen printing portion and a second screen printing portion disposed in the inner space, each comprising a conveyor belt, wherein the conveyor belt of the first screen printing portion and the conveyor belt of the second screen printing portion are disposed side by side; And
It includes a control unit for controlling the operation of the pair of screen printing unit,
The first screen printing unit and the second screen printing unit, respectively
A conveyor belt for transporting the substrate;
A table disposed below the conveyor belt to support the transferred substrate;
An alignment sensor unit for sensing an alignment state of the substrate located on the table;
A table lifter for moving the table up and down;
A screen assembly positioned at an upper side of the table, the screen assembly including a screen whose position is corrected according to an alignment state of the substrate; And
It includes a screen lifting unit for moving the screen assembly up and down,
Behind the table, the screen printing system, characterized in that the inspector for inspecting whether the substrate is completed screen printing is provided.
delete The method of claim 1,
And the screen assembly of the first screen printing portion and the screen assembly of the second screen printing portion are positioned diagonally to each other.
delete The method of claim 1,
An inspection belt is provided below the inspector to support and transport both ends of the substrate.
And between the inspection belts a discharge belt which operates in a direction intersecting with the advancing direction of the inspection belt so that a substrate determined as defective by the inspector is discharged.
The method of claim 1,
In order to prevent the movement of the substrate located on the table, the screen printing system, characterized in that the negative pressure hole for supplying a negative pressure is formed.
The method of claim 1,
The upper surface of the table, the screen printing system, characterized in that the groove is formed so that the conveyor belt is inserted.
The method of claim 1,
The alignment sensor unit is located below the table,
The table printing system, characterized in that the transparent sensor is provided in the table so that the alignment sensor unit can detect the alignment of the substrate.
The method of claim 8,
The alignment sensor unit,
A first sensor detecting a rear surface of the substrate;
A second sensor for sensing a side surface of the substrate; And
And a third sensor for sensing a rotation state of the substrate.
10. The method of claim 9,
The first sensor, the second sensor and the third sensor, the screen printing system, characterized in that it comprises a lighting means and a camera.
The method of claim 1,
The screen assembly,
A lower frame having a first opening in a center thereof; The screen is fixed to the underside of the lower frame.
An upper frame positioned on an upper side of the lower frame and having a second opening hole corresponding to the first opening hole;
A pair of guide parts positioned on an upper side of the upper frame to face each other with respect to the second opening hole;
Both ends of the support bar being supported by the pair of guide parts and movable along the longitudinal direction of the guide part; And
And a squeegee assembly coupled to the support bar and penetrating through the second opening hole and the first opening hole to print a paste applied on the screen onto the substrate.
The method of claim 11,
The support bar is screen printing system, characterized in that moved by the servo motor for driving the guide portion.
The method of claim 11,
The screen lifting unit,
A plurality of screen support legs arranged to be spaced apart along the edge of the lower frame to support the lower frame and extend vertically; And
And a motor for moving the screen support leg up and down using a gear train.
The method of claim 13,
The conveyor belt and the table are located on a table frame,
And the opening is formed in the table frame through which the screen support leg passes.
The method of claim 1,
The conveyor belt is coupled to the belt frame,
The table lifting unit,
A plurality of table support legs arranged to be spaced apart along the edge of the table, the table supporting legs extending up and down; And
And a cylinder for moving the belt frame up and down.
The method of claim 1,
And a substrate detection sensor positioned at the front of the table to sense the transfer of the substrate and to adjust the operation of the conveyor belt so that the substrate is positioned and stopped at the table.

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