JP2011255512A - Mask, apparatus and method for printing screen - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a screen printing mask that enables certainly performing random mixed production of a plurality of kinds of substrate surfaces under an optimal print condition and enables sharply shortening switching time of the plurality of kinds of substrate surfaces, and to provide a screen printing apparatus and method using the screen printing mask.SOLUTION: The screen printing mask 1 is a metal mask of the shape of a thin plate whose thickness is about 100-150 μm in metal, and is used in order to perform screen printing of the printing paste such as cream solder to a substrate surface of a printed circuit board. In one screen printing mask 1, two kinds of opening patterns 2 and 3 are formed corresponding to two kinds of the substrate surfaces. Here the shape of the opening is the shape corresponding to a land on the substrate surface of the printed circuit board. Also in the screen printing mask 1, two kinds of information recognition marks 2a and 3a which record information openings 2 and 3, respectively. Here, a bar code, a QR code (R), etc. can be used for the information recognition marks 2a and 3a.

Description

  The present invention relates to a screen printing mask used for screen printing a printing paste such as cream solder on a printed board, and a screen printing apparatus and a screen printing method using the mask.

  Conventionally, when screen-printing a printing paste such as cream solder on a printed circuit board, a metal mask, which is a screen printing mask corresponding to the printed circuit board to be printed, is attached to the screen printing apparatus, and then the printing paste A printing condition program is called to perform screen printing under optimum printing conditions.

  Conventionally, however, since printing conditions are set individually by the operator, it is possible to program experienced and novice printing conditions (that is, the printing conditions of the operator vary), and printing after screen printing. In some cases, the quality of the substrate also varies.

  In addition, when screen printing is performed by mixing multiple types of substrate surfaces (that is, mixed production), it is not possible to check which substrate surface the metal mask is for, so the multiple types of substrate surfaces are regular. It was a necessary condition to flow. When a plurality of types of substrate surfaces are flowed at random, there may be a problem in matching with the metal mask. Therefore, conventionally, random mixed production of a plurality of types of substrate surfaces has been difficult.

  Therefore, various proposals have been made to solve these problems (see, for example, Patent Documents 1 and 2).

  That is, in Patent Document 1, an information display mark in which information about various printing conditions for a printed circuit board is recorded is formed on a metal mask, and various printing conditions for the printed circuit board are automatically set by reading the information display mark. A configuration is proposed.

  Further, in Patent Document 2, a code signal of a printing condition is given to a metal mask, the code signal is read by a reading device, and information on a storage device attached to the screen printing device based on the read code signal. A configuration has been proposed in which the change operation of each part of the screen printing apparatus is automatically performed according to the printing conditions read from the retrieved information.

Japanese Patent Laid-Open No. 11-151797 JP-A-5-261890

  However, the configurations of Patent Documents 1 and 2 simply prevent the occurrence of variations in operator printing condition settings, and have not yet achieved random mixed production of a plurality of types of substrate surfaces. That is, conventionally, it is necessary to change the screen printing mask every time the type of the substrate surface to be screen printed is switched, and it takes a long time to switch the screen printing operation for a plurality of types of substrate surfaces.

  The present invention has been made in order to solve the above-described problems in the prior art, and makes it possible to set optimum printing conditions for each of a plurality of types of substrate surfaces, and at the same time, randomly select a plurality of types of substrate surfaces. It is an object of the present invention to provide a screen printing mask that makes it possible to realize mixed production, and a screen printing apparatus and a screen printing method using the same. More specifically, the present invention makes it possible to reliably perform random mixed production of multiple types of substrate surfaces under optimal printing conditions, and greatly increase the switching time of screen printing operations for multiple types of substrate surfaces. An object of the present invention is to provide a mask for screen printing that can be shortened, and a screen printing apparatus and a screen printing method using the mask.

  In order to achieve the above object, a screen printing mask according to the present invention is a screen printing mask used for screen printing a printing paste on a substrate surface of a printed circuit board. A plurality of types of corresponding opening patterns are formed, and a plurality of types of information recognition marks each recording information about each of the opening patterns are provided.

  According to the configuration of the screen printing mask, a plurality of information can be obtained by reading information about each opening pattern corresponding to each type of substrate surface recorded on each information recognition mark provided on the screen printing mask. It is possible to set optimum printing conditions for each type of substrate surface. Also, since multiple types of opening patterns corresponding to multiple types of substrate surfaces are formed, it is possible to achieve random mixed production of multiple types of substrate surfaces by using a screen printing mask with this configuration. become.

  The configuration of the screen printing apparatus according to the present invention is a screen printing apparatus that screen prints a printing paste on a substrate surface of a printed board using a screen printing mask, and the screen printing mask includes a plurality of types of the substrates. A plurality of types of opening patterns corresponding to the surface, a plurality of types of information recognition marks each recording information about each of the opening patterns, and a recognition unit that reads the information recognition marks A printing condition setting unit that automatically sets various printing conditions for each substrate surface based on information about each opening pattern recorded in each information recognition mark, and the various printing conditions for each substrate surface. And a storage unit for storing the program.

  According to the configuration of the screen printing apparatus, the information about each opening pattern corresponding to each type of substrate surface recorded on each information recognition mark provided on the screen printing mask is read by the recognition unit, and printing condition setting is performed. The optimum printing conditions for each type of substrate surface can be automatically set by the section. That is, according to the configuration of this screen printing apparatus, it is possible to automatically set optimum printing conditions for each of a plurality of types of substrate surfaces. As a result, there is no variation in the setting of the printing conditions by the operator, and it is possible to prevent variations in the quality of the printed circuit board after screen printing. In addition, by storing a program of various printing conditions for each substrate surface in the storage unit, respectively, by reading out a program of various printing conditions for each substrate surface from the storage unit at the start of screen printing for each substrate surface, Random mixed production of multiple types of substrate surfaces can be realized. At that time, it is not necessary to change the screen printing mask every time the type of the substrate surface to be screen printed is switched, and it is only necessary to switch programs of various printing conditions read from the storage unit. It is possible to greatly shorten the switching time of the screen printing operation for the above.

  Further, in the configuration of the screen printing apparatus of the present invention, based on the result of trial printing each substrate surface using the various printing conditions for each substrate surface automatically set by the printing condition setting unit, It is preferable that a printing condition fine adjustment unit for finely adjusting the various printing conditions for each substrate surface is further provided, and the program for the various printing conditions after fine adjustment for each substrate surface is stored in the storage unit. According to this preferable example, random mixed production of a plurality of types of substrate surfaces can be realized under more optimal printing conditions.

  Further, in the configuration of the screen printing apparatus of the present invention, the board surface type determining means for determining the type of the board surface by detecting a board surface identification mark given to the board surface of the printed board to be carried in. And, based on the determination result by the substrate surface type determination means, the substrate surface of the printed circuit board is positioned and held below the opening pattern of the screen printing mask corresponding to the substrate surface, and It is preferable that a program for the various printing conditions for the substrate surface is selected. According to this preferred example, it is possible to automatically position and hold a certain type of substrate surface below the corresponding opening pattern and perform screen printing on the substrate surface.

  A screen printing method according to the present invention is a screen printing method in which a printing paste is screen-printed on a substrate surface of a printed board using a screen printing mask, and the screen printing mask includes a plurality of types of substrate surfaces. A plurality of types of corresponding opening patterns are formed, a plurality of types of information recognition marks each recording information about each of the opening patterns are provided, and the substrate surface of the printed circuit board to be loaded is provided. Determining the type of the substrate surface by detecting the given substrate surface identification mark, and based on the determination result, the substrate surface of the printed circuit board corresponding to the substrate surface of the screen printing mask. Positioned and held below the opening pattern and created based on the information recognition mark Characterized in that it comprises the step of selecting various printing conditions programs for substrate surface.

  According to this screen printing method, it is possible to automatically position and hold a certain type of substrate surface below the corresponding opening pattern and perform screen printing on the substrate surface. Random mixed production of the substrate surface can be realized. At that time, it is not necessary to change the mask for screen printing every time the type of substrate surface to be screen-printed changes, and it is only necessary to switch programs for various printing conditions. Switching time can be greatly reduced.

  According to the present invention, random mixed production of a plurality of types of substrate surfaces can be surely performed under optimal printing conditions, and the switching time of screen printing operations for a plurality of types of substrate surfaces can be greatly reduced. Is possible.

The schematic plan view which shows the structure of the mask for screen printing in one embodiment of this invention 1 is a schematic plan view showing the configuration of a screen printing apparatus according to an embodiment of the present invention. The block diagram which shows the structure of the control system of the screen printing apparatus in one embodiment of this invention The flowchart which shows the screen printing method performed using the screen printing apparatus in one embodiment of this invention Operation explanatory diagram of substrate positioning movement operation in a screen printing method executed using the screen printing apparatus of one embodiment of the present invention Operation explanatory diagram of substrate positioning movement operation in a screen printing method executed using the screen printing apparatus of one embodiment of the present invention Operation explanatory diagram of substrate positioning movement operation in a screen printing method executed using the screen printing apparatus of one embodiment of the present invention

  Hereinafter, the present invention will be described more specifically using embodiments.

[Screen printing mask configuration]
First, the configuration of a screen printing mask according to an embodiment of the present invention will be described with reference to FIG. FIG. 1 is a schematic plan view showing a configuration of a screen printing mask according to an embodiment of the present invention.

  As shown in FIG. 1, the screen printing mask 1 of the present embodiment is a thin metal mask made of metal and having a thickness of about 100 to 150 μm, and a printing paste such as cream solder is applied to the substrate surface of the printed board. Used for screen printing.

  In one screen printing mask 1, two types of opening patterns 2 and 3 corresponding to two types of substrate surfaces are formed. Here, the shape of the opening is a shape corresponding to the land on the substrate surface of the printed circuit board, and each of the opening patterns 2 and 3 is formed by etching or laser processing.

  The “two types of substrate surfaces” include the two types of printed circuit boards, but the front side substrate surfaces and the back side substrate surfaces of one printed circuit board are also “two types of substrate surfaces”. "include.

  One screen printing mask 1 is provided with two types of information recognition marks 2a and 3a in which information about the respective opening patterns 2 and 3 is recorded. Here, as the information recognition marks 2a and 3a, a barcode, a QR code, or the like can be used. In addition, as a method of applying these, a method of applying a label or the like is conceivable, but it may be applied by etching or laser processing simultaneously with the formation of the opening patterns 2 and 3.

  According to the screen printing mask 1 having the above-described configuration, the opening patterns 2 and 3 corresponding to the types of substrate surfaces recorded on the information recognition marks 2a and 3a provided on the screen printing mask 1 are described. By reading each information, it is possible to set optimum printing conditions for each of the two types of substrate surfaces. Moreover, since two types of opening patterns 2 and 3 corresponding to two types of substrate surfaces are formed, random mixed production of two types of substrate surfaces is realized by using the screen printing mask 1 having this configuration. It is also possible to do.

  The types of opening patterns formed on one screen printing mask 1 are not limited to two types, and may be three or more types. In this case, there are three or more types of information recognition marks depending on the number of types of opening patterns. That is, according to the configuration of the mask for screen printing of the present invention, it is possible to realize random mixed production of a plurality of types of substrate surfaces.

[Configuration of screen printing device]
Next, the configuration of the screen printing apparatus according to an embodiment of the present invention will be described with reference to FIG. FIG. 2 is a schematic plan view showing the configuration of the screen printing apparatus in one embodiment of the present invention.

  As shown in FIG. 2, the screen printing apparatus 4 according to the present embodiment includes a substrate positioning stage 6 having a transfer conveyor 7 for transferring a printed board 5, and the substrate positioning stage 6 in the X-axis direction, the Y-axis direction, and the center. A four-axis control robot 8 capable of moving in the θ-axis direction, which is the in-plane rotation direction around the point S, and in the vertical direction (Z-axis (not shown) direction perpendicular to the paper surface of FIG. 2); It has.

  A screen printing mask 1 is attached above the horizontal movable range of the substrate positioning stage 6. As described above, the screen printing mask 1 has two types of opening patterns 2 and 3 corresponding to two types of substrate surfaces. Further, the screen printing mask 1 is provided with two types of information recognition marks 2a and 3a in which information about the respective opening patterns 2 and 3 is recorded. Each information recognition mark 2a and 3a is provided with each opening pattern. The substrate surface identification marks 5a are attached to the substrate surfaces corresponding to 2 and 3.

  A substrate surface identification mark 5a applied to the substrate surface of the printed circuit board 5 carried into the substrate positioning stage 6 is detected by a substrate surface identification mark detection unit (not shown). The substrate surface identification mark detection unit also detects the information recognition marks 2a and 3a attached to the screen printing mask 1. In addition to information on each of the opening patterns 2 and 3, the information recognition marks 2 a and 3 a have “a position within the horizontal movable range of the substrate positioning stage 6 corresponding to the installation positions of the opening patterns 2 and 3”. The position data shown is recorded, and by detecting each information recognition mark 2a, 3a by the substrate surface identification mark detection unit, “the substrate positioning stage 6 corresponding to the installation position of each opening pattern 2, 3 can be moved horizontally. Position data indicating “position within range” is stored in the storage unit 11 (see FIG. 3) described later. As described above, each information recognition mark 2a, 3a is associated with the substrate surface identification mark 5a provided on the substrate surface corresponding to each opening pattern 2, 3, so that the substrate positioning stage 6 By detecting the substrate surface identification mark 5a given to the substrate surface of the printed circuit board 5 to be carried in by the substrate surface identification mark detection unit, “the substrate positioning stage 6 corresponding to the installation position of each of the opening patterns 2 and 3”. The position data indicating “position within the horizontal movable range” is read from the storage unit 11, and the control unit 10 (see FIG. 3) described later refers to the read position data and performs substrate conveyance positioning driving described later. The unit 17 (see FIG. 3) is controlled. As a result, the 4-axis control robot 8 is driven, and the substrate surface of the printed circuit board 5 moves to “a position within the horizontal movable range of the substrate positioning stage 6 corresponding to the installation positions of the opening patterns 2 and 3”. . The substrate surface identification mark detection unit is a barcode reader and detects barcodes as the substrate surface identification mark 5a and the information recognition marks 2a and 3a. As the substrate surface identification mark 5a and the information recognition marks 2a and 3a, a QR code or the like can be used in addition to the barcode.

  Further, in order to accurately position the respective opening patterns 2 and 3 of the screen printing mask 1 and the circuit pattern on the substrate surface of the printed circuit board 5, the screen printing mask 1 is provided corresponding to the respective opening patterns 2 and 3. A position mark (not shown) for alignment and a position mark (not shown) for alignment provided on the substrate surface of the printed circuit board 5 fixed to the substrate positioning stage 6 are displayed on the camera ( (Not shown) can be read by recognition.

  Then, the substrate surface identification mark 5a given to the substrate surface of the printed circuit board 5 carried into the substrate positioning stage 6 is read by a bar code reader, and the screen printing mask 1 is made to correspond to each of the opening patterns 2 and 3. The position mark for alignment provided and the position mark for alignment provided on the substrate surface of the printed circuit board 5 fixed to the substrate positioning stage 6 are read by camera recognition, and based on these reading results. Then, a certain type of substrate surface is automatically positioned and held below the corresponding opening pattern 2 or 3 and is lifted to bring it into contact with the screen printing mask 1 so that the screen is in contact with the substrate surface. Printing pace of cream solder etc. using squeegee 9a or 9b provided above the printing mask 1 It is possible to screen printing.

[Configuration of control system of screen printing device]
Next, the configuration of the control system of the screen printing apparatus according to the embodiment of the present invention will be described with reference to FIG. FIG. 3 is a block diagram showing the configuration of the control system of the screen printing apparatus in one embodiment of the present invention.

  In FIG. 3, the control unit 10 is a central processing unit (CPU), and the control unit 10 controls each unit described below by executing various processing programs stored in the storage unit 11. As a result, various operations such as a substrate transport operation and a screen printing operation are performed.

  The storage unit 11 stores various operation programs such as various printing condition programs and conveyance operation programs. The program of various printing conditions is an operation program for screen printing a printing paste such as cream solder on the substrate surface of the printed circuit board 5 positioned and held below the opening pattern 2 or 3 of the screen printing mask 1. Examples of various printing conditions include the size of the printed circuit board 5, the squeegee stroke, the squeegee speed, the squeegee printing pressure, the plate release stroke, and the plate release speed. The conveyance operation program sends the printed circuit board 5 carried in from the upstream side to a predetermined position of the screen printing mask 1 where the screen printing operation is performed on the substrate surface of the printed circuit board 5, and from the predetermined position. This is an operation program for sending the printed printed circuit board 5 downstream.

  The recognition unit 12 is a bar code reader, and reads two types of information recognition marks 2a and 3a made of a bar code in which information about each of the opening patterns 2 and 3 provided on the screen printing mask 1 is recorded. The printing condition setting unit 13 automatically sets various printing conditions for each substrate surface based on the information about the opening patterns 2 and 3 recorded in the information recognition marks 2a and 3a. Then, the storage unit 11 corresponds to the position data indicating the “position within the horizontal movable range of the substrate positioning stage 6 corresponding to the installation positions of the opening patterns 2 and 3” and the opening patterns 2 and 3. A program of various printing conditions (that is, for each substrate surface) is stored in pairs.

  The above-mentioned “position within the horizontal movable range of the substrate positioning stage 6 corresponding to the installation positions of the opening patterns 2 and 3” is the substrate surface of the printed circuit board 5 carried into the substrate positioning stage 6 as described above. The substrate surface identification mark 5a applied to the substrate is read by a bar code reader, and the alignment mark provided to the screen printing mask 1 corresponding to each of the opening patterns 2 and 3 and the substrate positioning stage 6 are applied. The position mark for alignment given to the fixed printed circuit board 5 is read by camera recognition, and on the basis of these reading results, a certain type of substrate surface is below the corresponding opening pattern 2 or 3. By automatically positioning and holding each, the board surface of one printed board 5 is corrected to the optimum position.

  According to the screen printing apparatus 4 configured as described above, information about each opening pattern 2 and 3 corresponding to each type of substrate surface recorded on each information recognition mark 2a and 3a provided on the screen printing mask 1 is obtained. The optimum printing conditions for each type of substrate surface can be automatically set by the recognition unit 12 and read by the printing condition setting unit 13. That is, according to the screen printing apparatus 4 having the above-described configuration, it is possible to automatically set optimum printing conditions for each of the two types of substrate surfaces. As a result, there is no variation in the setting of the printing conditions by the operator, so that it is possible to prevent variations in the quality of the printed circuit board 5 after screen printing. Also, various printing condition programs for each substrate surface are stored in the storage unit 11, and the various printing condition programs for each substrate surface are read from the storage unit 11 when screen printing for each substrate surface is started. Thus, random mixed production of two types of substrate surfaces can be realized. At that time, it is not necessary to replace the screen printing mask every time the type of the substrate surface to be screen printed is switched, and it is only necessary to switch programs for various printing conditions read from the storage unit 11, so that a plurality of types of substrates can be used. It is possible to greatly reduce the switching time of the screen printing operation for the surface.

  In the screen printing apparatus 4 of the present embodiment, it is desirable to include a printing condition fine adjustment unit 14. This printing condition fine adjustment unit 14 is based on the result of trial printing each substrate surface using various printing conditions for each substrate surface automatically set by the printing condition setting unit 13, such as plate separation speed and squeegee speed. Fine-tune various printing conditions for each substrate surface. Then, a program of various printing conditions after fine adjustment for each substrate surface is stored in the storage unit 11. According to this desirable configuration, random mixed production of two types of substrate surfaces can be realized under more optimal printing conditions.

  In addition, it is desirable that the screen printing apparatus 4 of the present embodiment includes the board surface type determination unit 15. The substrate surface type determination unit 15 determines the type of the substrate surface of the printed circuit board 5 based on the detection result of the substrate surface identification mark 5a by the substrate surface identification mark detection unit. Therefore, the substrate surface identification mark detection unit (barcode reader) and the substrate surface type determination unit 15 detect the barcode as the substrate surface identification mark 5a given to the substrate surface of the printed circuit board 5 carried in from the upstream side. Thus, the substrate surface type determining means for determining the types a and b of the substrate surface. Then, based on the determination result by the substrate surface type determining means, the substrate surface of the printed circuit board 5 is positioned and held below the opening pattern 2 or 3 of the screen printing mask 1 corresponding to the substrate surface, and the substrate surface A program for various printing conditions is selected. According to this desirable configuration, a certain type of substrate surface is automatically positioned and held below the corresponding opening pattern 2 or 3 and is raised so that the substrate surface comes into contact with the mask 1 for screen printing. Screen printing on the surface can be performed.

  The squeegee drive unit 16 drives screen printing means such as squeegees 9a and 9b. The substrate transport positioning drive unit 17 drives the transport conveyor 7 of the substrate positioning stage 6 and drives the 4-axis control robot 8. In the above configuration, the control unit 10 is a screen printing operation control unit that controls the squeegee driving unit 16 based on programs of various printing conditions, and controls the substrate conveyance positioning driving unit 17 based on the conveyance operation program. A transport operation control unit.

[Screen printing method]
Next, a screen printing method executed using the screen printing apparatus according to the embodiment of the present invention will be described with reference to FIGS. FIG. 4 is a flowchart showing a screen printing method executed using the screen printing apparatus according to the embodiment of the present invention, and FIGS. 5 to 7 are operation explanatory views of the substrate positioning movement operation in the screen printing method. .

  Here, two types of substrate surfaces of type a and type b are alternately carried into the substrate positioning stage 6 in this order, and a screen printing operation is performed in the screen printing apparatus 4 on these two types of substrate surfaces. An example will be described.

  First, as shown in FIG. 5, the printed circuit board 5 is carried into the substrate positioning stage 6 from the upstream side (S1 in FIG. 4).

  When the printed circuit board 5 is carried into the substrate positioning stage 6, a substrate surface identification mark 5a applied to the substrate surface of the printed circuit board 5 is detected by a substrate surface identification mark detection unit (bar code reader) (FIG. 4). S2). Based on the detection result of the substrate surface identification mark 5a by the substrate surface identification mark detection unit, the substrate surface type determination unit 15 determines the type of the substrate surface of the printed circuit board 5 (S3 in FIG. 4).

  If it is determined that the substrate surface of the printed circuit board 5 carried into the substrate positioning stage 6 is type a (S4 in FIG. 4), the alignment is applied to the screen printing mask 1 corresponding to the opening pattern 2 The position mark for alignment and the position mark for alignment provided on the printed circuit board 5 fixed to the substrate positioning stage 6 are read by camera recognition, and the control unit 10 executes the substrate transfer positioning drive unit according to the transfer operation program. 17 is controlled. As a result, the four-axis control robot 8 is driven, and as shown in FIGS. 5 and 6, the substrate surface of type a of the printed circuit board 5 is “horizontal of the substrate positioning stage 6 corresponding to the installation position of the opening pattern 2. It is positioned and held at “position within the movable range”, and then lifted and brought into contact with the screen printing mask 1 (S5 in FIG. 4).

  Next, a program of various printing conditions for the substrate surface of type a stored in the storage unit 11 is read from the storage unit 11 (S6 in FIG. 4), and the control unit 10 reads the various printing conditions read out. The squeegee drive unit 16 is controlled by the program to drive the squeegee 9a and the like. Thereby, the screen printing operation on the type a substrate surface is started in the screen printing apparatus 4 (S7 in FIG. 4). When the screen printing operation on the substrate surface of type a is completed, the printed circuit board 5 is carried out to the downstream process, and the substrate positioning stage 6 is returned to the substrate loading position. Then, the next printed circuit board 5 to be screen printed is carried into the substrate positioning stage 6 from the upstream side.

  If the substrate surface of the printed circuit board 5 carried into the substrate positioning stage 6 is determined as the type b (S8 in FIG. 4), the alignment is applied to the screen printing mask 1 corresponding to the opening pattern 3 The position mark for alignment and the position mark for alignment provided on the printed circuit board 5 fixed to the substrate positioning stage 6 are read by camera recognition, and the control unit 10 executes the substrate transfer positioning drive unit according to the transfer operation program. 17 is controlled. As a result, the four-axis control robot 8 is driven, and as shown in FIGS. 5 and 7, the substrate surface of the type b of the printed circuit board 5 is “horizontal of the substrate positioning stage 6 corresponding to the installation position of the opening pattern 3. It is positioned and held at “position within the movable range”, and then lifted and brought into contact with the screen printing mask 1 (S9 in FIG. 4).

  Next, a program of various printing conditions for the substrate surface of type b stored in the storage unit 11 is read from the storage unit 11 (S10 in FIG. 4), and the control unit 10 reads the various printing conditions read out. The squeegee 9b and the like are driven by controlling the squeegee drive unit 16 according to the program. Thereby, the screen printing operation on the type b substrate surface is started in the screen printing apparatus 4 (S11 in FIG. 4). When the screen printing operation on the type b substrate surface is completed, the printed circuit board 5 is unloaded to the downstream process, and the substrate positioning stage 6 is returned to the substrate loading position. Then, the next printed circuit board 5 to be screen printed is carried into the substrate positioning stage 6 from the upstream side.

  Thereafter, two types of substrate surfaces, type a and type b, are repeatedly carried in this order into the substrate positioning stage 6 and screen printing operations are performed on each substrate surface in the same manner as described above. Thereafter, it is determined whether or not the screen printing work on all the substrate surfaces has been completed (S12 in FIG. 4). If the screen printing work on all the substrate surfaces has been completed, the work is performed there. Is completed.

  According to the screen printing method described above, a certain type of substrate surface is automatically positioned and held below the corresponding opening pattern, and is raised so that the substrate is brought into contact with the screen printing mask 1. Screen printing on the surface can be performed, and as a result, random mixed production of two types of substrate surfaces can be realized. At that time, it is not necessary to change the screen printing mask every time the type of the substrate surface to be screen printed is switched, and it is only necessary to switch the program for various printing conditions. Switching time can be greatly reduced.

  In the screen printing method described above, the case where two types of substrate surfaces of type a and type b are repeatedly carried into the substrate positioning stage 6 one by one in this order has been described as an example. The order to carry in to 6 is not limited to this. For example, a plurality of types of substrate surfaces may be successively transferred to the substrate positioning stage 6 and then different types of substrate surfaces may be transferred to the substrate positioning stage 6.

  In the above-described screen printing method, the case where two types of substrate surfaces of type a and type b are mixed to perform screen printing (that is, mixed production) is described as an example. The type of surface is not limited to two types, and may be three or more types. This mixed production of three or more types of substrate surfaces uses a screen printing mask on which three or more types of opening patterns corresponding to three or more types of substrate surfaces are formed, and corresponds to the configuration and control method of the screen printing apparatus. Thus, it can be realized by changing as appropriate.

  According to the present invention, random mixed production of a plurality of types of substrate surfaces can be surely performed under optimal printing conditions, and the switching time for a plurality of types of substrate surfaces can be greatly shortened. Therefore, the present invention is useful for a screen printing apparatus in which improvement in production efficiency is desired.

DESCRIPTION OF SYMBOLS 1 Screen printing mask 2, 3 Opening pattern 2a, 3a Information recognition mark 4 Screen printing apparatus 5 Printed board 5a Board surface identification mark 6 Board positioning stage 7 Conveyor 8 4-axis control robot 9a, 9b Squeegee 10 Control part 11 Storage part DESCRIPTION OF SYMBOLS 12 Recognition part 13 Print condition setting part 14 Print condition fine adjustment part 15 Substrate surface type determination part 16 Squeegee etc. drive part 17 Board | substrate conveyance positioning drive part

Claims (5)

A screen printing mask used for screen printing a printing paste on a substrate surface of a printed circuit board,
A plurality of types of opening patterns corresponding to a plurality of types of the substrate surfaces are formed, and a plurality of types of information recognition marks each recording information about each of the opening patterns are provided. Mask. A screen printing apparatus that screen prints a printing paste on a printed circuit board using a screen printing mask,
The screen printing mask is provided with a plurality of types of opening patterns corresponding to a plurality of types of substrate surfaces, and a plurality of types of information recognition marks respectively recording information about the respective opening patterns. And
A recognition unit for reading each information recognition mark;
A printing condition setting unit for automatically setting various printing conditions for each substrate surface based on information about each opening pattern recorded in each information recognition mark;
A screen printing apparatus comprising: a storage unit that stores a program of the various printing conditions for each of the substrate surfaces. Printing conditions for finely adjusting the various printing conditions for the substrate surfaces based on the results of trial printing the substrate surfaces using the various printing conditions for the substrate surfaces automatically set by the printing condition setting unit A fine adjustment unit,
The screen printing apparatus according to claim 2, wherein a program of the various printing conditions after fine adjustment for each substrate surface is stored in the storage unit. Further comprising a substrate surface type determining means for determining a type of the substrate surface by detecting a substrate surface identification mark given to the substrate surface of the printed circuit board to be carried in,
Based on the determination result by the substrate surface type determination means, the substrate surface of the printed circuit board is positioned and held below the opening pattern of the mask for screen printing corresponding to the substrate surface, and the substrate surface with respect to the substrate surface The screen printing apparatus according to claim 2, wherein a program for various printing conditions is selected. A screen printing method for screen printing a printing paste on a substrate surface of a printed circuit board using a screen printing mask,
The screen printing mask is provided with a plurality of types of opening patterns corresponding to a plurality of types of substrate surfaces, and a plurality of types of information recognition marks respectively recording information about the respective opening patterns. And
Determining the type of the substrate surface by detecting a substrate surface identification mark given to the substrate surface of the printed circuit board to be carried in;
Based on the determination result, the substrate surface of the printed circuit board is positioned and held below the opening pattern of the screen printing mask corresponding to the substrate surface, and the substrate is created based on the information recognition mark Selecting a program of various printing conditions for the surface.

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