JPH0286190A - Printing printed circuit board - Google Patents

Abstract

PURPOSE:To obtain an accurate and quality printed circuit board by performing dummy printing with a printing plate, storing a printed image into a monitor, and aligning the alignment holes of the printed circuit board to be printed on the stored alignment pattern. CONSTITUTION:After alignment patterns 13 are printed beforehand by dummy printing on printing paper, etc., installed on a substrate mount with a printing plate having the alignment patterns 13 in the four corners, an image of the positions of the centers of the four alignment patterns 13 printed by dummy printing is stored into a monitor, the substrate mount 11 is moved in directions X, Y, and theta so that the positions of the centers of the alignment patterns 13, the image of which has been stored, may agree with those of four alignment holes 18 made beforehand in a printed circuit board 19 to be printed, and the printed circuit board is fixed. Through hole land patterns are printed correctly at the through holes of the printed circuit board without being affected by plate warp and regardless of the manufacturing accuracy of the plate by performing printing by moving the substrate mount on which the printed circuit board to be printed is mounted to under the printing plate.

Description

[Detailed Description of the Invention] [Summary] Regarding a screen printing method for a printed circuit board, an alignment pattern is formed in a through hole (
The purpose of this method is to provide a method that allows for highly accurate positioning and screen printing of a printing pattern on a printed circuit board to be printed, so that the printed circuit board to be printed is placed on a printed circuit board installation stand. , install a member to perform dummy printing, move the printed circuit board installation stand under a printing plate with alignment patterns on the four corners, perform dummy printing on the member, and then move the printed circuit board installation stand to its original position. Then, the alignment pattern dummy-printed on the member is projected onto a monitor having separate reference marks using four projection means provided on the four corners of the printed circuit board installation stand, and a dummy alignment pattern is printed at the center of the reference mark. After separately moving the projection means and storing the image in advance so that the center part of the printed alignment pattern is located, after removing the member on which dummy printing was performed from the printed circuit board installation stand, the printed circuit board is installed. After setting the printed circuit board to be printed on the table with the alignment pole opened in advance, the printed circuit board to be printed is separately projected by the four projection means so that the central part of the reference mark on the monitor is the first printed circuit board. After adjusting the printed circuit board by moving it in the X, Y, and θ directions so that it fits within the center of the alignment holes opened in advance at the four corners of the board, fix the printed circuit board to be printed on the board mounting table, and then It is constructed by moving the printed circuit board installation stand under the printing plate and printing.

[Industrial application field]

The present invention relates to a method for screen printing printed circuit boards.

When forming a printed circuit board using a ceramic substrate, a green sheet is punched to form through holes, and then a paste-like conductor is screen printed on the green sheet using a screen printing method to form through holes. After forming land patterns for connecting through holes and circuit patterns, the green sheet is fired to form a printed circuit board.

[Conventional technology]

A conventional method of screen printing such conductors will be described.

In the conventional method, as shown in FIG.
Alignment hole 2 formed by punching etc.
A printed circuit board 3 made of a ceramic substrate is installed, and a mesh-like structure is formed with fluororesin fibers on top of the printed circuit board 3.
Alternatively, mesh-like printing plates 4 made of stainless steel members with fine lines are placed one on top of the other, and the alignment pattern 5 provided on the printing plate is aligned with the alignment hole 2 of the substrate. After moving the board installation stand 1 in the X and Y axis directions so that the alignment hole 2 and the alignment pattern 5 provided on the printing plate 4 match, the printing plate 4 and the printed circuit board 3 are fixed, The printed circuit board 3 is printed by applying a conductive paste onto the fixedly installed printing plate 4 using a squeegee.

(Problem to be Solved by the Invention) However, the printing plate 4 described above is formed using fluororesin fibers and fine wire members made of stainless steel, and the printed circuit board 3 is formed using the same printing plate 4. If you print a large number of sheets using the same method, there is a risk that the printing plate 4 may be distorted. The problem arises that a printed pattern cannot be formed with high precision.

In addition, printing plate making 4 is difficult to manufacture due to the fine dimensions of the mesh, and the accuracy of printing plate making using fluororesin fibers is 20.
It has an accuracy of 0 to 300 μm, and a stainless steel printing plate has an accuracy of only 80 to 150 μm, and if this printing plate is used to print on a printed circuit board, higher precision cannot be obtained. There is a drawback that the position of the through hole is not located in the center of the through ball land pattern and is shifted.

The present invention solves the above-mentioned problems, and aims to provide a method for printing a printed circuit board in which the through holes provided in the printed circuit board and the land pattern printed on the printed circuit board using a printing plate are not misaligned. .

[Means for Solving the Problems] A printed circuit board printing method of the present invention that achieves the above object includes installing a member for performing dummy printing on a printed circuit board installation stand on which a printed circuit board is to be printed, and After moving the board installation stand under a printing plate with alignment patterns provided at the four corners and performing dummy printing on the member, move the printed circuit board installation stand to its original position and place the alignment pattern dummy printed on the member. The image is projected onto a monitor having separate reference marks using four projection means installed on the four corners of the printed circuit board installation stand, so that the center of the dummy-printed alignment pattern is located at the center of the reference mark. After moving the projection means separately and storing the image in advance, and removing the member on which dummy printing was performed from the printed circuit board installation stand, a printing process is performed in which an alignment hole is opened in advance on the print A temporary installation stand. After installing the printed circuit board to be printed, the printed circuit board to be printed is separately projected by the four projection means so that the center part of the reference mark of the monitor falls within the center part of the alignment hole opened in advance at the four corners of the printed board. After making adjustments by moving the printed circuit board installation stand in the X, Y, and θ directions, fix the printed circuit board to be printed on the board installation stand, and then move the printed circuit board installation stand under the printing plate. Characterized by printing.

[For production]

The method of the present invention uses a printing plate with alignment patterns 13 provided at the four corners as shown in FIG. 1(a), FIG. 1(b), FIG. 1(C), and FIG. 3(a). After dummy printing is performed in advance on printing paper or the like placed on the board installation stand, the positions of the centers of the four dummy-printed alignment patterns 13 are stored as images on a monitor, and the alignment patterns stored as images on this monitor are 13 and the positions of the centers of four alignment holes 18 previously opened in the printed circuit board to be printed, move the board installation stand in the X, Y, and θ directions so that to secure the printed circuit board. By moving the board installation stand on which the printed circuit board to be printed is placed under the printing plate and printing, the through-holes of the printed circuit board can be printed without being affected by the distortion of the printing plate or the production accuracy of the printing plate. The through-hole land pattern is printed without being misaligned.

In this way, alignment can be performed with higher precision than in the case where the alignment hole 18 and the alignment pattern 13 are aligned at three locations as shown in FIG. 3(b).

〔Example〕

Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings.

As shown in FIG. 1(a), along the X-axis and Y-axis directions,
A printing paper 12 to be dummy printed is placed on a substrate installation table 11 that moves in the angle θ direction from the X-axis and Y-axis directions, and a printing plate 14 with alignment patterns 13 provided at the four corners is placed on the substrate installation table 11. and perform dummy printing on the paper 12.

Next, the board setting table 11 carrying the printing paper 12 on which dummy printing has been carried out is moved horizontally from the printing plate 14 along the direction of arrow A on a rail (not shown) provided at the lower part of the board setting table 11.

Next, as shown in FIG. 1(b), the four alignment patterns 13 printed on the printing paper 12 are simultaneously imaged using the four television cameras 15 on the board installation stand 11, and as shown in FIG. Images are stored on four monitors 16 connected to each of the television cameras 15. A reference pattern 17 of an alignment pattern is provided in advance on the four monitors 16, and the four television cameras 15 are moved separately so that the alignment pattern 13 matches the reference pattern 17. By doing this,
Dummy printed printing plate alignment pattern 13
is stored as an image on the monitor television 16.

Only one monitor 16 may be provided, and the display screen may be divided into four equal parts and an image may be displayed on the four equal parts.

Next, as shown in FIG. 1(C), the printing paper 12 on which dummy printing has been printed is removed from the board installation stand 11, and the printed circuit board 19 to be printed with the alignment poles 18 at the four corners opened in advance is installed on the board installation stand 11. .

Then, this alignment hole 18 is photographed by four television cameras 15, and the lL+E installation stand 11 is moved in X, Y, and θ so that the center of the dummy-printed alignment pattern 13 whose image is stored in advance on the monitor 16 matches.
After moving the printed circuit board 19 in the direction, the printed circuit board 19 to be printed is fixed to the board mounting table 11.

Next, this substrate installation stand 11 is moved along the direction of arrow B below the printing plate 14 described above, and printing is performed.

These operations are performed every time one IJ board is printed.

In this way, the printing plate is dummy printed, the image is stored on the monitor, and the alignment hole 18 of the printed circuit board to be printed is aligned with the image-stored alignment pattern 13, so the printing plate is made. A through-hole land pattern that matches the position of the through-hole (alignment hole 18) of the printed circuit board is formed without being affected by the distortion of the printed circuit board or the precision of the printing plate.

(Effects of the Invention) As is clear from the above description, according to the present invention, a through-hole land pattern that does not shift in position in the through-hole (alignment hole) can be obtained, and a highly accurate and high-quality printed circuit board can be obtained. be.

[Brief Description of the Drawings] Figures 1(a) to 1(C) are explanatory diagrams of the printed circuit board printing method of the present invention, Figure 2 is an explanatory diagram of a monitor TV screen, and Figure 3 is an explanatory diagram of the printed circuit board printing method of the present invention. (a) is an explanatory diagram of alignment using four-point recognition according to the present invention, FIG. 3(b) is an explanatory diagram of alignment using two-point recognition, and FIG. 4 is an explanatory diagram of a conventional printed circuit board printing method. In the figure, 11 is a board installation stand, 12 is printing paper, 13 is an alignment pattern, 14 is a printing plate, (5 is a television camera, 1
6 is a monitor, 17 is a reference pattern, 18 is an alignment hole, and 19 is a printed circuit board. Agent Patent Attorney Sada Igata - Hayashi (b) (C) Figure 2 ■ → Real name is No. 9-4, City, Koyoroi tl Fitohif 3L98 Group No. 3 (aan 2) Point 1'A (Saved by S 1 Ka Diagram (b)

Claims (1)

[Claims] A dummy printing member (12) is installed on the printed circuit board installation stand (11) on which the printed circuit board (19) to be printed is installed, and alignment patterns (13) are placed on the four corners of the printed circuit board installation stand (11). After moving below the provided printing plate (14) and performing dummy printing on the dummy printing member, the printed circuit board installation stand (11) is moved to the original position, and the dummy printed alignment pattern (13) is A monitor (16) having reference marks (17) with four projection means (15) provided on the four corners of the printed circuit board installation stand.
) and dummy-printed the alignment pattern (13) in the center of the reference mark (17).
) so that the center part of After installing the printed circuit board (19) to be printed with alignment holes (18) opened in advance on the circuit board installation stand (11), the printed circuit board (19) to be printed is displayed on the four projection means (15). Separately copy the reference mark (17) of the monitor (16) so that the center part of the reference mark (17) fits within the center part of the alignment hole (18) opened in advance at the four corners of the printed circuit board (19) to be printed.
The printed circuit board installation table (11) is moved and adjusted in the X, Y, and θ directions to fix the printed circuit board (19) to be printed on the circuit board installation table (11), and then the printed circuit board installation table (11) is fixed. A method of printing a printed circuit board, characterized in that the printed circuit board is moved under a printing plate (14) and printed.