JP2552021B2 - Method for manufacturing printed wiring board - Google Patents

Description

The present invention relates to a method for manufacturing a printed wiring board (hereinafter referred to as PWB), and more particularly to a method for aligning a PWB and a mask original plate.

[Conventional technology]

5 (a), (b) and (c) are a plan view and a side view showing a PWB and a mask original plate for explaining an example of a positioning method in a conventional method for manufacturing a printed wiring board. Conventionally, a method for performing relative alignment between the PWB and the mask original plate is performed by setting the relative positions of the PWB1 and the mask original plate 2 as shown in FIGS. 5 (a), (b) and (c), respectively. A method of providing the pilot holes 6 and 7 and inserting the both pilot holes 6 and 7 into a reference pin (not shown) of the workbench is performed.

First, as shown in FIG. 5 (a), there is a method in which pilot holes 6 and 7 are provided at four positions on each of the PWB 1 and the mask original plate 2 to align them. This is because pilot holes 6 and 7 are provided at all 4 positions located at the intersections of two adjacent sides.
First, four pilot holes 6 of the PWB 1 are inserted into four reference pins on the workbench, and then four pilot holes 7 of the original mask plate 2 are inserted to position and align them.

Next, in the case shown in FIG. 5 (b), pilot holes 6 and 7 are formed at the center of each of the four edges of the PWB 1 and the mask original plate 2.
In the case shown in FIG. 5 (c), the pilot holes 6 are provided at 3 of the 4 intersections of the two adjacent sides.
7 is provided. In either case, positioning and alignment are performed by the above method.

6 (a) and 6 (b) are PWBs for explaining another example of the alignment method in the conventional method for manufacturing a printed wiring board.
3A and 3B are a plan view and a side view of a mask original plate. In this alignment method, pilot holes 6 and 7 are provided at one of the intersections of two adjacent sides of the PWB 1 and the mask original plate 2, and this is used as the origin to perform final alignment visually. Is. In this method, first, as shown in FIG. 6A, the pilot hole 6 of the PWBZ 1 is inserted into the reference pin 10 on the workbench 11, and then the pilot hole 7 of the mask original plate 2 is inserted. At this time, each deviation between the PWB 1 and the mask original plate 2 is θ. Next, a circuit pattern formed on the PWB 1, a circuit pattern on the mask original plate 2 facing the through hole 8 and its position, or a circuit pattern on the mask original plate 2 facing the through hole 8 and its position, Alternatively, it is a method of performing visual alignment while rotating the through hole portion 9 around the origin of the mask original plate 2. The state at this time is shown in FIG. 6 (b), and the deviation between the PWB 1 and the mask original plate 2 is θ≈0 °. The angle error with 0 ° at this time depends on the resolution of the eye.

[Problems to be Solved by the Invention]

In the mechanical positioning method of the printed wiring board and the mask original plate using the pilot holes in the conventional printed wiring board manufacturing method described above, in the variation of the reference pin diameter on the alignment workbench and the clearance between the pins and the holes. And PWB,
There must be variation in the pilot hole diameter of the original mask. Further, there was a problem that stable quality could not be obtained due to misalignment due to variations in pilot hole position accuracy of PWB and mask original plate. In addition, PWB has many kinds and many manufacturing sizes, so there are many pilot hole positions, the size and number of reference pins change, wasting the number of setup work holes, and it is difficult to automate the alignment of these. There were challenges.

An object of the present invention is to provide a method for manufacturing a printed wiring board by an optical alignment means in order to eliminate such a drawback.

[Means for solving the problem]

A feature of the present invention is that in a method for manufacturing a printed wiring board, including a step of aligning a mask original plate on which a circuit pattern is drawn and a printed wiring board, the mask original plate is used regardless of the size of the printed wiring board. The one pilot mark and the one pilot land at one corner corresponding to each other of the printed wiring board are located at the same position, and the center of the one pilot mark and the one pilot land are set as the origin of the XY coordinates, and the X and Y directions from the origin. Form multiple other pilot marks and other pilot lands at equal intervals on
At least two pilot marks and pilot lands are selected from the one pilot mark, the one pilot land, the other pilot mark, and the other pilot land, and the selected pilot mark and the pilot land are substantially coincident with each other. After mechanical alignment as described above, the positional deviation between the pilot mark and the pilot land is optically measured and the amount of deviation is stored,
It is a method of manufacturing a printed wiring board, which includes a step of reading the stored displacement amount and moving the mask original plate and the printed wiring board relative to each other by the displacement amount to align them.

〔Example〕

 Next, the present invention will be described with reference to the drawings.

1 (a) and 1 (b) are a plan view and a cross-sectional view showing a PWB and a mask original plate for explaining an embodiment of a method for manufacturing a printed wiring board according to the present invention. In the alignment method in the method for manufacturing a printed wiring board according to the present invention, first, as shown in FIGS. 1 (a) and 1 (b), the PWB 1 and the mask original plate 2 are located at respective corners, and their centers are common. X as the origin
That is, the pilot lands 3 and the pilot marks 4 are arranged at predetermined positions on the −X axis and the YY axis, for example, at equal pitch a and equal pitch b, respectively. The pilot land 3 and the pilot mark 4 are used for relative alignment between the PWB 1 and the mask original plate 2.

FIG. 2 is a diagram for explaining a method of aligning the PWB and the mask original plate of FIG. In this alignment method, first, the pilot lands 3a1 and 3a2 provided on the PWB1 are
With the positioning cameras 5 and 5a provided in the positioning device, position coordinates 3a1 (X, Y) = (Xa1, Ya1), 3a2 (X, Y) = (Xa2, Ya
2) Remember. Next, the position coordinates of the pilot marks 4a1 and 4a2 on the mask original plate 2 are matched with the stored position coordinates.

3 (a) and 3 (b) are diagrams showing the relative positions of the pilot land and pilot mark of the PWB. First, as shown in FIG. 3A, rough positioning is mechanically performed in advance. At this time, the deviation amount (ΔtX, ΔtY) between the two is (3Xa1
-4Xa1,3Ya1-4Ya1). Next, (ΔtX, ΔtY) is read by the camera for image confirmation. Next, the exposure table is moved by the amount of deviation of (ΔtX, ΔtY) so as not to shift the positioned mask original plate to the orthogonal axis, and the position is fixed. In this way, the PWB corrected on the orthogonal axis by the camera is successively and continuously superposed on the mask original plate.

FIGS. 4A to 4D are diagrams showing examples of the shapes of pilot lands and pilot marks. The shapes of the pilot land and pilot mark described above are, for example,
The circle shown in FIG. 4 (a), the quadrangle shown in FIG. 4 (b),
The triangle shown in FIG. 4 (c) and the cross shape shown in FIG. 4 (d) can be used. Which one is used is selected depending on the printability and the optical resolution. As the size of the pilot land and the pilot mark, 1 to 20 mm 2 is the most efficient processing in the image confirmation camera.

〔The invention's effect〕

As described above, the present invention has the following effects.

(1) Since it is a non-contact optical alignment method, it is possible to manufacture a PWB with high accuracy.

(2) Pilot land and pilot mark are PWB
Since it is provided at a fixed position regardless of the size and type, the setup time for camera alignment and the like can be shortened at the time of model switching, so cost reduction can be expected.

(3) Since pilot lands and pilot marks are formed at predetermined positions on the printed wiring board and mask original board in advance, it is easy to automate PWBs of various types and manufacturing sizes, and it is possible to reduce the number of man-hours for alignment work. Cost reduction can be expected.

[Brief description of drawings]

1 (a) and 1 (b) are a plan view and a sectional view showing a PWB and a mask original plate for explaining an embodiment of a method for manufacturing a printed wiring board according to the present invention, and FIG. 2 is a PWB of FIG. And FIG. 3 (a) and FIG. 3 (b) are views for explaining a method of aligning the mask land with the mask master plate. FIG. 3 (a) and FIG. Figure showing relative position, 4th
Figures (a) to (d) are diagrams showing examples of the shapes of pilot lands and pilot marks, and Figures 5 (a), (b) and (c) show a positioning method in a conventional printed wiring board manufacturing method. A plan view and a side view showing a PWB and a mask original plate for explaining an example, and FIGS. 6 (a) and 6 (b) are for explaining another example of an alignment method in a conventional method for manufacturing a printed wiring board. FIG. 3 is a plan view and a side view of a PWB and an original mask plate. 1 ... PWB, 2 ... mask original plate, 3 ... pilot land, 4 ... pilot mark, 5,5a ... image recognition camera, 6 ... pilot hole, 7 ... pilot hole, 8,9 ... Circuit pattern and through hole, 10 ……
Reference pin, 11 ... Workbench.

Claims (1)

(57) [Claims] 1. A method of manufacturing a printed wiring board, comprising the step of aligning a mask original plate on which a circuit pattern is drawn with a printed wiring board, the mask original plate and the printed wiring board being independent of the size of the printed wiring board. One pilot mark and one pilot land at one corner corresponding to each other on the printed wiring board are set to the same position, and the center of the one pilot mark and the one pilot land is set as the origin of the XY coordinate in the X and Y directions from this origin. A plurality of other pilot marks and other pilot lands are formed at equal intervals, and at least two pilot marks and pilot lands are selected from the one pilot mark, the one pilot land, the other pilot mark and the other pilot land. And select the selected pilot mark and pilot land After mechanically aligning them so that they coincide with each other, the positional deviation between the pilot mark and the pilot land is optically measured to store the deviation amount, and the stored deviation amount is read to read the mask original plate and the printed wiring. A method of manufacturing a printed wiring board, which comprises the step of moving the board relative to the board by the displacement amount and aligning the board.