JP3901311B2 - Screen printing method and apparatus and screen plate processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention mainly relates to a screen printing method, a screen printing apparatus, and a screen plate processing method for printing a printing paste such as cream solder and thick film circuit forming paste on a printed board.
[0002]
[Prior art]
In recent years, screen printing devices have been used in cream solder printing processes in the circuit mounting process of electronic components. However, as electronic devices have become smaller, printed circuit boards for forming electronic circuits have progressed, and cream solder has been developed accordingly. High-precision printing is required.
[0003]
FIG. 4 shows a conventional screen printing apparatus.
[0004]
First, in order to align the screen plate 4 and the printed circuit board 1, a position mark (not shown) for alignment on the screen plate 4 is read by the recognition camera 7 at the position Q in the figure. Next, the printed circuit board 1 is positioned and fixed to the positioning stage 2 that can be moved up and down by the positioning stage lifting and lowering driving means 3 at the position P in the figure, and the position mark for alignment on the printed circuit board 1 is omitted by the recognition camera 7 (not shown) Read. The positioning stage 2 moves horizontally from the position P in the drawing to the position Q based on the recognition result of the alignment mark, and then positions until the upper surface of the printed circuit board 1 comes into contact with the lower surface of the screen plate 4. It is lifted by the stage lifting / lowering driving means 3.
[0005]
Squeegees 5 a and 5 b are attached to the tip of the squeegee lifting drive means 6. The squeegee horizontal reciprocating drive means 8 is generally a servo motor. The squeegee horizontal reciprocating drive means 8 is moved horizontally with the right squeegee 5a descending and in contact with the upper surface of the screen plate 4, and the right squeegee 5a applies a printing paste 9 such as cream solder. The printing paste 9 is filled in the opening of the screen plate 4 by moving on the upper surface of the screen plate 4. Thereafter, a plate separating operation for separating the printed circuit board 1 from the screen plate 4 is performed by the positioning stage elevating drive means 3, the right squeegee 5 a is raised, and then the printed circuit board 1 is removed.
[0006]
Next, the printing operation with the left squeegee 5b is performed in the same manner as described above, and thereafter the operation is alternately repeated.
[0007]
FIG. 5 shows a work and an operation flow at the time of model switching in the conventional screen printing apparatus. Note that S1 to S14 are step numbers indicating work and operation procedures, and coincide with the numbers appended to the text.
[0008]
First, the screen plate 4 is replaced with a model to be produced (S1). If the printed circuit board 1 to be produced has been produced before, the program is read (S9) and screen mark recognition (S10) is performed. When the printed circuit board 1 to be produced is a new model, the size of the printed circuit board 1 is set (S3), and the screen mark teaching (S4) and the printed circuit board mark teaching are performed to align the screen plate 4 and the printed circuit board 1. (S5) is performed. Thereafter, the squeegee stroke is set from the size of the printed circuit board 1, and the squeegee speed, squeegee printing pressure, and the like are set from the characteristics of the printing paste (S6). Next, a plate separation stroke and a plate separation speed are set based on the characteristics of the printing paste (S7), and then a cleaning condition and the like are set (S8). Thereafter, in order to align the screen plate 4 and the printed circuit board 1, screen mark recognition is performed based on a program created by teaching the screen mark (S10). Various condition settings and teaching operations for steps S3 to S8 are manually input on the operation screen.
[0009]
This is the setting operation of the printing conditions that must be performed before actually starting production.
[0010]
Next, the process proceeds to actual production, printing board carry-in (S11), printed board mark recognition (S12), printing (S13), printed board carry-out (S14), and production of one printed board is completed. The second and subsequent printed circuit boards will be produced sequentially.
[0011]
[Problems to be solved by the invention]
In the above-described conventional screen printing method, setting of printing conditions, teaching of screen position marks and printed circuit board position marks is done manually, and the setting operation takes a very long time. There was a problem that the set values varied.
[0012]
SUMMARY OF THE INVENTION An object of the present invention is to automatically set printing conditions for a printed circuit board, to shorten the time for setting printing conditions, and to prevent variations in setting printing conditions by an operator.
[0013]
[Means for Solving the Problems]
In order to solve the above problems, the first invention of the present application is to position and fix a printed circuit board on a stage part, recognize a position mark on the printed circuit board by a recognition camera , position the stage part below the screen plate, In the screen printing method in which after the printed board is brought into contact with a predetermined position on the lower surface of the screen plate, the printing paste supplied on the screen plate is filled in the opening of the screen plate with a squeegee and transferred onto the printed board. Information display mark that records information about various printing conditions including squeegee stroke and squeegee speed for printed circuit board, and reference position information of printed circuit board position mark and reference position information of screen plate position mark on screen plate formed, when replacing the screen plate, the recognition mosquito the information display mark Reading La, on the basis of information about various printing conditions information display mark read, as well as automatically setting various print conditions to the print substrate, the recognition camera based on the read reference position information of the position mark of the screen plate movement to recognize the position marks of the screen plate, the relative positioning has been printed board, the position marks of the printed circuit board by moving the recognition camera on the basis of the reference position information of the position mark of the printed board read recognized, moves the position information of the position mark of the recognized printed circuit board, and the positional information of the position mark of the recognized screen plate, the printed circuit board on the basis of the read printed board and the reference position information of the position mark of the screen plate was The quantity is determined and the printed circuit board and the screen plate are aligned.
[0014]
By adopting such a screen printing method, the information display marks formed on the screen plate in advance are read before the start of production, so that the optimum printing conditions such as the squeegee stroke and the squeegee speed can be set for the corresponding printed circuit board in a short time. In addition, it is possible to prevent variations in print condition setting by the operator.
[0015]
Further, since the information display mark includes the reference position information of the position mark of the printed circuit board and the reference position information of the position mark of the screen plate, the printed circuit board was manually operated by reading it before the start of production. The position mark and screen plate position mark teaching operation can be omitted , and the position information of the recognized printed circuit board and screen plate position marks and the reference position information of these position marks obtained from the read information. Since the amount of movement of the printed circuit board is determined based on the above and the printed circuit board and the screen plate are aligned, optimum screen printing can be performed automatically .
[0016]
Also, when constituting the information display mark in the bar code, it is preferable because it can easily perform formation of information mark.
[0017]
The second invention of the present application is characterized in that the information display mark is processed simultaneously with the processing of the circuit pattern on the screen plate used in the screen printing method.
[0018]
By simultaneously processing the circuit pattern and the information display mark on the screen plate, the processing time can be shortened, and the positional relationship between the circuit pattern and the information display mark can be accurately maintained.
[0019]
According to a third aspect of the present invention, the printed circuit board is positioned and fixed on the stage unit, the position mark on the printed circuit board is recognized by the recognition camera , the stage unit is positioned below the screen plate, and the predetermined position on the lower surface of the screen plate is set. In a screen printing apparatus in which after the printed board is brought into contact with the printing plate, the printing paste supplied onto the screen plate is filled in the opening of the screen plate with a squeegee and transferred onto the printed board. An information display mark is formed, which records information about various printing conditions including squeegee stroke, squeegee speed, and information including reference position information of a printed circuit board position mark and reference position information of a screen plate position mark, and information It is possible to move the display mark and the position mark on the printed circuit board and screen plate. A recognition unit comprising a single recognition camera, when replacing the screen plate, read the information display mark on the screen plate with the recognition camera, the printing apparatus on the basis of information about various printing conditions information display mark read controls, read recognition camera movement control on the basis of the reference position information of the position mark of the screen plate has to recognize the position marks of the screen plate, the relative positioning has been printed board, printed circuit board read the recognition camera movement control based on position reference position information of a mark, to recognize the position marks of the printed board, and the positional information of the position mark of the printed circuit board that is recognized by the recognition camera, position information of the position mark of the screen plate If, printed circuit on the basis of the read printed board and the reference position information of the position mark of the screen plate was Characterized by comprising a control unit which determines the amount of movement to align the printed circuit board and the screen plate with.
[0020]
Said 1st invention can be implement | achieved suitably.
[0021]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS.
[0022]
FIG. 1 shows a screen printing apparatus according to this embodiment. Since this apparatus is basically configured in the same manner as the conventional example shown in FIG. 4, the same reference numerals are given to the parts common to the conventional example, and the detailed description thereof is omitted.
[0023]
FIG. 2 shows a screen plate 4 of the present embodiment. On the screen plate 4, an information display mark 10 made of a barcode is formed in advance together with the formation of a circuit pattern forming portion 11 and a reference position mark (not shown) for alignment. The present invention is characterized in that the printing condition is automatically set by reading the information display mark 10 formed on the screen plate 4 in advance before production.
[0024]
The printing conditions recorded are not only the printing conditions on the printed circuit board, such as the printed circuit board size, squeegee stroke, squeegee speed, squeegee printing pressure, detaching stroke, detaching speed, and cleaning conditions, but also the standard of the screen plate. Conventionally, all the information manually input on the operation screen, including the position information of the position mark and the reference position mark of the printed circuit board.
[0025]
In addition, as an information display mark in which the printing conditions formed on the screen plate 4 are encoded, a dot matrix or the like can be considered in addition to the barcode. As a forming method, there is a method of sticking as a seal or the like. However, considering workability and reading accuracy, it is preferable to process by etching, laser processing or the like simultaneously with processing of the circuit pattern of the screen plate 4.
[0026]
The recognition unit having the recognition camera 7 has a function of reading the information display mark 10 on the screen plate 4 and reading the position mark of the screen plate and the position mark of the printed board.
[0027]
FIG. 3 shows the work and operation flow when switching the model in the screen printing apparatus of the present invention. Note that S1 to S7 are step numbers indicating work and operation procedures, and coincide with the numbers appended to the text.
[0028]
First, the screen plate 4 is replaced with a model to be produced (S1). Next, the information display mark 10 previously formed on the screen plate 4 is read by the recognition camera 7 at the position R in FIG. Data read by the recognition camera 7 is sent to a control unit (not shown), and the operation of the printing apparatus is controlled based on various printing conditions recorded therein (S2). At this time, the printing conditions are recorded as described above, and everything that has been manually input on the operation screen in the past is recorded. In the present invention, the information display mark 10 encoded and recorded in the above printing condition is read before production to automatically set the printing condition, thereby shortening the printing condition setting time and setting the printing condition by the operator. It has a feature in eliminating the variation of.
[0029]
Next, a position mark (not shown) for alignment on the screen plate 4 is read by the recognition camera 7 at the position indicated by Q in FIG.
[0030]
Thereafter, the actual production is started, and the printed circuit board 1 is carried in (S4), and the position mark (not shown) of the printed circuit board 1 is read by the recognition camera 7 at the position P in FIG. Based on the position information of the position mark, the position information of the position mark of the screen plate 4, and the reference position information already obtained by reading the information display mark 10, the movement amount of the printed circuit board 1 is determined. Position alignment between the substrate 1 and the screen plate 4 is performed, and then screen printing is performed based on conditions such as squeegee stroke, squeegee speed, squeegee printing pressure, plate separation stroke, plate separation speed set as optimum printing conditions. Performed (S6). Thereafter, the printed board is carried out (S7). In this way, the production of one printed board is completed, and steps S4 to S7 are repeated, and the second and subsequent printed boards are sequentially produced.
[0031]
【The invention's effect】
As described above, according to the present invention, it is possible to automatically set the printing conditions by reading the printing conditions previously recorded on the information display mark formed on the screen plate before the start of production. Therefore, it is possible to shorten the time for setting the printing conditions, and it is possible to eliminate variations in the printing conditions setting by the operator. In addition, by reading the reference position information of the printed circuit board position mark and the reference position information of the screen plate position mark before the start of production, the teaching operation of the printed circuit board position mark and the screen plate position mark that was performed manually Further, the amount of movement of the printed circuit board is determined based on the position information of the recognized position marks of the printed circuit board and the screen plate and the reference position information of these position marks obtained from the read information. Since the printed circuit board and the screen plate are aligned, optimum screen printing can be automatically performed .
[Brief description of the drawings]
FIG. 1 is a configuration diagram of a screen printing apparatus according to an embodiment of the present invention.
FIG. 2 is a plan view of the screen plate according to the embodiment of the present invention.
FIG. 3 is a flowchart illustrating the operation of the screen printing apparatus according to the embodiment of the present invention.
FIG. 4 is a configuration diagram of a conventional screen printing apparatus.
FIG. 5 is a flowchart illustrating the operation of a conventional screen printing apparatus.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Printed circuit board 4 Screen plate 7 Recognition camera 9 Print paste 10 Information display mark 11 Circuit pattern formation part

Claims (4)

The printed circuit board is positioned and fixed on the stage unit, the position mark on the printed circuit board is recognized by the recognition camera , the stage unit is positioned below the screen plate, and the printed circuit board is brought into contact with a predetermined position on the lower surface of the screen plate. After that, in the screen printing method of transferring the printing paste supplied on the screen plate onto the printed circuit board by filling the opening of the screen plate with a squeegee,
Information display mark that records information about various printing conditions including squeegee stroke and squeegee speed for printed circuit board, and reference position information of printed circuit board position mark and reference position information of screen plate position mark on screen plate formed, when replacing the screen plate, read the information display mark in the recognition camera, based on information about various printing conditions information display mark read, as well as automatically setting various printing conditions for the print substrate, Based on the reference position information of the read position mark of the screen plate, the recognition camera is moved to recognize the position mark of the screen plate, and for the positioned printed circuit board, a reference of the read position mark of the printed circuit board printing by moving the recognition camera based on the position information Recognizing the position mark of the plate, on the basis of the position information of the position mark of the printed board recognized, the position information of the position mark of the recognized screen plate, and the reference position information of the position mark of the printed board and the screen plate read in And determining the amount of movement of the printed circuit board and aligning the printed circuit board and the screen plate.   The screen printing method according to claim 1, wherein the information display mark is composed of a barcode.   3. A method for processing a screen plate used in the screen printing method according to claim 1, wherein the information display mark is processed simultaneously with the circuit pattern on the screen plate. The printed circuit board is positioned and fixed on the stage unit, the position mark on the printed circuit board is recognized by the recognition camera , the stage unit is positioned below the screen plate, and the printed circuit board is brought into contact with a predetermined position on the lower surface of the screen plate. After that, in a screen printing apparatus that fills the opening of the screen plate with a squeegee and transfers the printing paste supplied on the screen plate onto the printed board,
On the screen plate, an information display that records information about various printing conditions including the squeegee stroke and squeegee speed for the printed circuit board, and information including the reference position information of the position mark of the printed circuit board and the reference position information of the position mark of the screen plate When the screen plate is replaced with a recognition unit consisting of a movable recognition camera that reads the position mark of the information display mark and the printed circuit board and the screen plate, the information display mark on the screen plate is displayed. The printing device is controlled based on information about various printing conditions of the information display mark read and read by the recognition camera, and the recognition camera is moved and controlled based on the reference position information of the read position mark of the screen plate. Recognizes the position mark of the printed circuit board Is against, read the recognition camera movement control on the basis of the reference position information of the position mark of the printed circuit board has to recognize the position marks of the printed board, and the positional information of the position mark of the printed circuit board that is recognized by the recognition camera A control unit that determines the amount of movement of the printed circuit board based on the position information of the position mark of the screen plate and the reference position information of the position mark of the printed circuit board and the screen plate, and aligns the printed circuit board and the screen plate And a screen printing apparatus.

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