JPS5823757B2 - Jig for screen printing printed wiring boards - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in jigs used in the printing process during the manufacture of printed wiring boards.

As is well known, in the production of printed wiring boards, a step is performed to form an ink resist film that functions as a plating mask or an etching mask on a printed wiring board, such as a copper-clad laminate, by screen printing.

The ink resist film formed by such screen printing is used when creating circuit patterns for printed wiring boards, and it significantly affects the performance and yield, so it is important to form a highly accurate ink resist film.

Incidentally, screen printing of an ink resist film on a copper-clad laminate has conventionally been carried out using the following procedure.

That is, as shown in FIG. 1, for example, a screen plate 4 having a structure in which a mesh-like stencil film 2 having three alignment marks 1 a t 1 btlc in the XY direction is stretched over a frame 3, and the alignment marks 1a, A jig plate 6 is prepared in which three guide pins 5a, 5b, and sc are implanted so as to match pins 1b and 1c.

Then, the guide holes 8a, 8b, 8c of the copper-clad laminate 7 are fitted into the guide pins 5a, 5b, t5c of the jig plate 6 and fixed, and then the jig plate 6 is moved in the XY direction to Align one guide pin (for example, 5a) with the alignment mark 1a of the screen plate 4, and then move the jig plate 6 slightly in the θ direction to align the other guide pins 5b and 5c with the alignment mark 1a of the screen plate 4.
Alignment is performed by matching the alignment marks lb and 1c, respectively.

Thereafter, ink is cast onto the stencil film 2 of the screen plate 4 according to a conventional method, and a predetermined ink resist film is printed on the copper-clad laminate 7 by moving a squeegee (not shown).

However, in the above screen printing process, one jig plate 6 is used, and the guide pins 5a, 5b of the jig plate 6 are moved in the XY direction and in the θ direction.

5c and screen version 4 alignment marks 1a and 1b.

1c, even if any guide pin 5a of the jig plate 6 and the alignment mark 1a of the screen plate 4 match when the jig plate 6 is moved in the XY direction, the subsequent movement in the θ direction When moving, alignment must be performed again due to unavoidable positional deviation.

As a result, the positioning becomes complicated and there are disadvantages in that it requires wearing for a long time.

The present invention has been made to solve the above-mentioned drawbacks.
A main jig plate that has an adjustment function in the Y direction, and an auxiliary jig plate that is fitted and placed on the reference guide pin of the main jig plate and has an adjustment function in the θ direction about the guide pin. It is an object of the present invention to provide a screen printing jig that can easily align a printed wiring board and a screen plate in a short time by configuring the present invention.

Hereinafter, one embodiment of the present invention will be described with reference to FIGS. 2 and 3.

In the figure, reference numeral 11 denotes a rectangular main jig plate movable in the X and Y directions, and a reference guide pin 13 having a small diameter projecting pin 12 at the tip is implanted on the upper surface of this main jig plate 11.

Note that the protruding pin 12 of this guide pin 13 is provided at a position that matches one of the alignment marks on the screen plate to be used. The shaped auxiliary jig plate 14 is the reference guide pin 1
3, and the auxiliary jig plate 14 is rotatable around the pin 13.

Further, on the upper surface of this auxiliary jig plate 14, the protrusion pin 12 is provided.
Two guide pins 15□15□ having the same diameter are implanted so as to match the other two alignment marks on the screen plate.

Therefore, the screen printing jig of the present invention consists of a main jig plate 11 and an auxiliary jig plate 14 which are separated into upper and lower parts, and has a structure in which the reference id pin 13 also serves as the rotation center of the auxiliary jig plate 14. The main jig plate 11 is movable only in the X and Y directions, and the auxiliary jig plate 14 is rotatable independently of the main jig plate 11. As shown in FIG. 7 guide holes 8a, 8b, 8c, insert the auxiliary jig plate 14 from the main jig plate 11.
152, move the main jig plate 11 in the XY directions to align the protrusion pin 12 of the reference guide pin 13 with one of the alignment marks 1a of the screen plate 4 having the structure described above, and then By rotating the auxiliary jig plate 14 in the θ direction about the reference guide pin 13, the protruding pin 12 of the reference guide pin 13 is aligned with the initial alignment mark 1a.
The guide pins 15. of the auxiliary jig plate 14 can be fixed without causing any displacement of the guide pins 15. of the auxiliary jig plate 14. ．． 15□ can be aligned with the other two alignment marks 1b and 1c on the screen plate 4, and the copper-clad laminate 7 can be positioned at a predetermined portion of the stzocial film 2 on the screen plate 4 very easily and quickly.

As a result, by casting ink on the stencil film 2 of the screen plate 4 and moving the squeegee according to a conventional method, a highly accurate ink resist film can be printed on the copper-clad laminate with good reproducibility.

As described in detail above, according to the present invention, it is possible to align a printed wiring board with respect to a screen plate in a short time and easily, and in turn, printing an ink resist film on a printed wiring board with high precision and high reproducibility. It is possible to provide a jig for screen printing printed wiring boards that has remarkable effects such as being able to perform the screen printing efficiently.

[Brief explanation of the drawing]

Fig. 1 is a perspective view showing a conventional screen printing jig plate and a copper clad laminate being positioned on a screen printing plate, and Fig. 2 is a screen printing jig showing an embodiment of the present invention. 3 is a side view of FIG. 2, and FIG. 4 is a perspective view showing a state in which a copper-clad laminate is aligned with a screen plate using the screen printing jig of the present invention. 1a, 1b, 1c... alignment mark, 2... stencil film, 4... screen plate, 7... copper clad laminate (
printed wiring board), 8a, 8b, 8c... dowel holes, 11
...Main jig plate, 12...Protrusion pin, 13...Reference guide pin, 14...Auxiliary jig plate, 151.152.
··guide pin.

Claims (1)

[Claims] 1. A main jig plate with a reference guide pin implanted at a position on the upper surface that matches one of the alignment marks of the screen plate to be used; A screen for a printed wiring board, comprising an auxiliary jig plate that has a guide pin at a position that matches another alignment mark on the screen plate and is rotatable about the reference guide pin. Printing jig.